List of Articles Microstructure

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  1 - Microstructure evolution in zirconium carbide thin films at different substrate temperatures
  Ali Heidarnia Hamid Ghomi
  10.30495/jtap.162217
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  2 - Estimation of lattice strain in alumina–zirconia nanocomposites by X-ray diffraction peak profile analysis
  Apurba Kanti Deb Partha Chatterjee
  10.1007/s40094-019-0338-z
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  3 - High Frequency Market Microstructure Noise Estimates and Inference Regarding Returns: a portfolio switching approach
  Jalal Seifoddini F. Rahnamay Roodposhti Hashem Nikoomaram
  Several studies about microstructure noise in capital markets have found that it is a vital aspect of a liquid market. In the absence of noise traders trading volume would severely decrease. However, on the other hand, market microstructure noise deviates prices from th More

  Several studies about microstructure noise in capital markets have found that it is a vital aspect of a liquid market. In the absence of noise traders trading volume would severely decrease. However, on the other hand, market microstructure noise deviates prices from their fundamental values. In this paper, we separate the microstructure noise from the price process and then we ask whether high frequency estimates of microstructure noise contain a risk factor and whether that risk factor is priced in the market, meaning that stocks that covary with our high-frequency measure of noise tend to get compensated in the form of higher returns. We examine this question through a portfolio switching approach by looking at the returns of portfolios sorted on our high frequency measurement of the magnitude of the market microstructure noise. The results show that the portfolio corresponding to the highest quartile noise outperforms the portfolio with the lowest quartile noise. Manuscript profile
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  4 - Investigation on relation between information asymmetry and liquidity via market microstructures model in Tehran Stock Exchange
  Reza Raei Reza Eivazlu Amir ali Abbaszadeh Asl
  Certainly, information is one of the most important factors in financial markets and stocks trading. Information symmetry is among the basic principles of an efficient market which is milestone in price clearance mechanism. Also, information risk is a considerable facto More

  Certainly, information is one of the most important factors in financial markets and stocks trading. Information symmetry is among the basic principles of an efficient market which is milestone in price clearance mechanism. Also, information risk is a considerable factor for investors in the stock markets. Existence of private information can cause increasing of investment risk. Information risk is a very important factor in trading of stocks that have low liquidityand low transaction numbers. Therefore, ignoring private information and information risk in this stocks’ trading, can cause irreparable losses. This work aims to investigate information asymmetry and information risk in Tehran Stock Exchange via using information risk models. Volume-Synchronized Probability of Informed Trading market microstructure model (VPIN) is one of the newest methods of calculating information risk in financial and stock markets. Intraday information of the active companies is used to compute information asymmetry for the stocks of Tehran Stock Exchange Manuscript profile
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  5 - Changes in the physical and microstructure attributes of surimi from black mouth croaker (Atrobucca nibe) during frozen storage (-18ºC)
  Seyed Pezhman Hosseini Shekarabi Seyed Ebrahim Hosseini Mehdi Soltani Abolghasem Kamali Tooraj Valinassab
  Black mouth croaker (Atrobucca nibe) is considered as a new and valuable fish stock in the deep water of the Oman Sea. In this study, nonmarket sized of the fish was subjected to produce surimi and kamabako gel manually and changes in the physical and microstructure pro More

  Black mouth croaker (Atrobucca nibe) is considered as a new and valuable fish stock in the deep water of the Oman Sea. In this study, nonmarket sized of the fish was subjected to produce surimi and kamabako gel manually and changes in the physical and microstructure properties of them during 6 months at freezing conditions were investigated. With increasing storage time, whiteness index from 66.24±0.20% to 60.11±0.23% and gel strength from 583.53±56.583 to 303.60±31.518 cm.g reduced after six months at frozen storage. The maximum expressible moisture content of kamabako gel sample (7.42 ± 0.268%) was obtained in six months storage (p<0.05). With increasing storage time, quality score of surimi gel decreased to 3.75±0.500 grade. Due to increase the shelf life, rough and irregular of protein structures were appeared in the protein network of the surimi. The average number of surimi polygonals were significantly decreased from 15038±280 to 10399±564 number per mm2 and their area were significantly increased from 27±0.9 to 84±4.5 µm2, with increasing storage time (p<0.05). The results indicated that in spite of relative decreasing in the functional properties of surimi proteins due to denaturation, produced surimi acceptable after six months at frozen storage. Manuscript profile
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  6 - Market Depth and Noisy Prices: A Maximum Likelihood Approach
  Jalal Seifoddini Fereydon Rahnamay Roodposhti Hashem Nikoomaram
  The information content of high frequency data has made them the main instruments for studying market microstructure. However, the noise content of this data may negatively affect the results of studies on market microstructure. Using maximum likelihood methodology, we More

  The information content of high frequency data has made them the main instruments for studying market microstructure. However, the noise content of this data may negatively affect the results of studies on market microstructure. Using maximum likelihood methodology, we disentangle from high frequency observations on the transaction prices of a sample of Tehran Stock Exchange stocks a fundamental component and a microstructure noise component. We then relate these statistical measurements of market microstructure noise to different financial measures of their market depth. We find that stocks with higher market depth have higher noise measured from their high frequency returns. This is in accordance with Fischer Black’s hypothesis that the existence of noise traders and the noise, which can be caused by the activities of this group of traders, to be the vital condition of a liquid market. We also find that pre-trade depth measures are the most powerful depth measure in explaining the noise in the market. Manuscript profile
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  7 - Research the effects of market microstructure on the stock price in Tehran Stock Exchange
  Sedigheh Rahbar Azam Soleymani Mirfeiz Fallahshams
  During the recent two decades, the academic studies quickly developed in the financial scope entitled with the market microstructure. The initial studies are started from the study of Bid-Ask Spread phenomenon and how quote was formed in the scope of market microstructu More

  During the recent two decades, the academic studies quickly developed in the financial scope entitled with the market microstructure. The initial studies are started from the study of Bid-Ask Spread phenomenon and how quote was formed in the scope of market microstructure. The studies of the market microstructure are very important in order to the presentation of approaches for helping to the investors in the investment strategy design and the practitioners and the policymakers of stock market in editing rules and transaction mechanisms. In this research the effects of microstructure on the stock price was examined from 2008 to 2011. For this purpose, the number of 43 companies as a sample was selected from Tehran Stock Exchange. In this research, we were used Panel Data for evaluation of theories because the combined studies data is from the sectional and time series data. The results indicate that during the research time, the small elements of market microstructure (Size, duration and Bid-Ask Spread) are more effective on the stock price.  This element of size in addition to the effect on the middle of quotes also is effective on Bid-Ask Spread .  Manuscript profile
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  8 - Effects of Boron and Zirconium on the Microstructure and High-Temperature Strength of Cast Fe3Al-Based Alloys
  M. Rajabi M. Shahmiri M. Ghanbari
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  9 - Investigation on Composition and Microstructural Morphology of the Fe-B-C Hardfacing Layers
  M. R. Tavakoli Shoushtari
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  10 - The Effect of Cooling Rate on the Microstructure and Mechanical Properties of the Plastic Injection Molds
  Z. S Seyedraoufi M Samiee F Abdi
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  11 - The Influence of Electromagnetic Vibration on the Microstructure and Corrosion Behavior of Incoloy 825 Superalloy Weld Metal
  A. Pourjafar R. Dehmolaei
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  12 - Improvement of Microstructure and Mechanical Properties of Manganese Steels by Adding Boron Alloying Element
  N. Arab
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  13 - The Effect of Cooling Rate on the Solutionizing of IN718 Superalloy Produced via Selective Laser Melting (SLM) Method
  H. H. Dastgerdi M. O. Shabani Y. Shajari
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  14 - The Influence of Boron Additions on Microstructure and Dry Sliding Wear of Cast FeAl-Based Alloys
  M Paryab M Ghanbari Haghighi
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  15 - Effects of Shielding Gas on the Depth, Width and Hardness of 17-4PH Stainless Steel during TIG Welding
  S, M Hosseini Farzaneh M Belbasi
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  16 - Effects of Shielding Gas on the Mechanical and Microstructural Properties of 409L Ferritic Stainless Steels during Gas Metal Arc Welding
  A. Feghhi A. Emamikhah Y. Bayat Asl
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  17 - Evaluation Microstructure and Hardness of the Fe-Cr-C Hardfacing Alloy with Cr/C=6 Ratio
  H Sabet
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  18 - Metallurgical Aspects of the Spinning Process in Metallic Liners
  S. M. J Hoseini H Ghayour A. S Golazani M. K Asgarani I Ebrahimzadeh
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  19 - The Influence of the Nickel Content on Microstructure and Mechanical Properties of the Al-Mg Weld Metal
  F. Sharifi
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  20 - Effect of Processing Parameters on Properties of Friction Stir Welded Joints of Aluminium Alloys AA7075- T651 and AA6061-T6
  H. S. Patil Neelsai Sharma Kairav Patel Abhishek Patel Viral Patel Chetan Patil
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  21 - Experimental Study and Modeling of Friction Stir Welding Process of Aluminum 1100 Alloys, using Artificial Neural Network with Taguchi Method
  V. Zakeri Mehrabad Ali Doniavi A. Gholipoor
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  22 - Recycling of Magnesium Machining Chips via Shear Consolidation Processing
  Reza Abdi Behnagh Peyman Mashhadi Keshtiban Hadi Abdollahi
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  23 - Microstructure Investigation and Mechanical Properties of Resistance Upset Butt Welded Ti-6Al-4V Alloy
  Mahmood Sharifitabar
  10.30495/admt.2020.1891939.1170
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  24 - The Effect of Sintering and Compaction Conditions on the Microstructure and Properties of AZ31 Magnesium Alloy
  amin saghafi Seyed Ehsan Eftekhari Shahri Hossein Jamshidi Mohammad Kazem Salari Razieh Khoshhal
  10.30486/admt.2022.1942847.1328
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  25 - Strength Improvement of Nano-Structured Titanium Processed by Parallel Tubular Channel Angular Pressing
  Ali Amani Hamid Soleimanimehr Shahram Etemadi Haghighi Farid Biniyazan
  10.30486/admt.2022.1942680.1318
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  26 - Construction of Porous Multiscale Heterogeneous Microstructures using Statistical Correlation Functions and Minimal Surfaces
  A Hasanabadi
  10.22034/jsm.2021.1921437.1674
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  27 - Selection of Optimal Tool Geometry for the Production of Brass Wires Using the FSBE Method
  M Akbari P Asadi H Rahimi Asiabaraki
  10.22034/jsm.2021.1938200.1714
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  28 - Analysis of loess sediment texture in Golestan province according to the microstructure parameters
  Somayeh Ghandhari Arash Amini Ali Solgi Hamed Rezaei
  10.30495/ijes.2019.669399
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  29 - The feasibility study of applying an acid boric and glass infiltrated mica to prevent the leakage and mixture of use gasses for hightemperature fuel cells
  Hamid Abdoli Alireza Hosseini Moghadam Seyed Amir Rastialhosseini
  In this study, the possibility of using mica for this application was investigated. First, mica gasket includingsmall Phlogopite flakes with organic binders was used and its performance duringas leakage was simulated in asmall set-up simulating fuel cell operating condi More

  In this study, the possibility of using mica for this application was investigated. First, mica gasket includingsmall Phlogopite flakes with organic binders was used and its performance duringas leakage was simulated in asmall set-up simulating fuel cell operating condition (air atmosphere, temperature of 800 °C and time of 100 h).Due to heating of mica during operation, binders were burned out and remaining pores acted as leakage path.These leakage paths were filled by acid boric and the mica performance was enhanced up to 20%. The majorleakage path (mica and its adjacent interface) was filled by a glass and a successful application of mica-glasslayer was obtained for leakage prevention. Manuscript profile
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  30 - Investigation of Mechanical Vibration Parameters on AL-A380 using Taguchi Method for the Construction of vehicle’s Shell pinion and gearbox
  Ehsan Safarpour Amin Kolahdooz
  The main aim of this study is the investigation of the mechanical vibration parameters using Taguchi method in the semi-solid casting of AL-A380. This research has been done to improve the mechanical properties and the development of this alloy for the construction of t More

  The main aim of this study is the investigation of the mechanical vibration parameters using Taguchi method in the semi-solid casting of AL-A380. This research has been done to improve the mechanical properties and the development of this alloy for the construction of the powertrains vehicle’s Shell pinion and gearbox. Grain diameter, hardness and porosity of samples were examined as important features of this research outputs. The results showed that the vibration of melt with suitable intensity and enough the period of time caused to decrease of the particle diameter and increase of the hardness. But with increasing of vibration intensity the porosity was increased especially at the high temperatures of vibration. In this research, the primary hardness that was measured around 80 BHN had increased to 100 BHN in condition of 595°C the melt temperature, vibration intensity of 90 Hz at the 30 seconds of the period of time. It was also observed in microstructure study that using this method, the microstructure was broken from the dendritic form to the spherical ones with the grain diameter of 32 micrometers. Manuscript profile
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  31 - Experimental investigation of microstructure of aluminum alloy in ECAP process with comparison of two round and square cross sections
  Mehdi Rafiei
  Pressing materials in ECAP angular molds is one of the forming methods and processes that is done in order to create high strains and stiffness with microstructural improvement. Using angle forming in molds with high pressure, and due to the certation of work hardening More

  Pressing materials in ECAP angular molds is one of the forming methods and processes that is done in order to create high strains and stiffness with microstructural improvement. Using angle forming in molds with high pressure, and due to the certation of work hardening phenomena, microstructural improvement, good mechanical properties and high flexibility can be achieved. In this paper, the quality of microstructure changes and the improvement of conditions and mechanical strength using the pressing method for aluminum alloy (6xxx) in an angular form is investigated. In this way the prepared forms have two square and circular cross sections and the samples were pressed through the angular pass only one time. The results of the studies showed that by pressing the samples, the structure was improved and uniform microstructure achieved. In the meantime, the samples with a circular cross-section showed better conditions of the effects of work hardening and structural improvement. Manuscript profile
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  32 - FSP pass number and cooling effects on the microstructure and properties of AZ31
  Akbar Heidarpour Saeed Ahmadifard Nadia Rohania
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  33 - The Effect of sintering temperature on microstructure and hardness of milled WC- 20 wt.% equiatomic (Fe,Co) cemented carbides
  Minoo Karbasi Maryam Karbasi Ali Saidi Mohammad Hossein Fathi
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  34 - Fatigue and corrosion fatigue properties of Ti-6Al-4V implant grade titanium alloy in Ringer solution
  Mahmoud Hajisafari Arman Zare Bidaki Saeid Yazdani
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  35 - Determination of solution temperature in an ex-service Ni-based turbine blade
  Mohammad Shademani Mohamadreza Rahimipour Ali Sedaghat Mohammad Farvizi
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  36 - The effect of saccharin on microstructure and corrosion behavior of nanocrystalline nickel thin films in alkaline solution
  Behrooz Shayegh Nima Zaghian
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  37 - Sintering and Characterizations of WC-20wt.% (Fe,Co) Nano-Structured Powders Developed by Ball-Milling
  Minoo Karbasi Maryam Karbasi Ali Saidi Mohammad Hossein fathi
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  38 - Influence of Cr dopant on the microstructure and optical properties of ZnO nanorods
  Saeed Safa A. Masoudi Nejad
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  39 - Investigation of Microstructure weld zone of Hastelloy X Pulsed Nd-YAG laser welds
  Farrokh Najafzadegan Hojatallah Mansori Morteza shamanian
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  40 - The Weldability Evaluation of Dissimilar Welds of AISI 347 Stainless Steel to ASTM A335 Low Alloy Steel by Gastungesten Arc Welding
  Iman Hajiannia Morteza Shamanian Masoud Kasiri
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  41 - A new approach for fabrication of bulk MMCs using Accumulative Channel-die Compression Bonding (ACCB)
  Alireza Babaei Hosein Jafarzadeh V. Zakeri Mehrabad
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  42 - The Effects of Mould Materials on Microstructure and Mechanical Properties of Cast A356 Alloy
  Musa Yıldırım Dursun ÖZYÜREK
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  43 - Effect of Thermomechanical Processing on the Microstructure and Mechanical Properties of a Duplex Stainless Steel
  Maryam Mohammad Jafarpour Bitollah Eghbali
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  44 - Structural characteristics and tribological properties of TiAlCr(Si)CN nanocomposite films coated on the SPK 1.2080 tool steel using PVD technique
  Mohammad Hassan Dadkhah Tehrani Abdolreza Jafari Tadi Yaghoub Yaghoubi Askarabad Majid Karimian Kamran Amini Mohammad Hossein Dadkhah Tehrani
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  45 - Effect of Twist Extrusion Process on the Mechanical Properties and Microstructure Evolution of 70-30 Brass Alloy
  Sara Hosseini Faregh Amir Hasani Majid Naseri
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  46 - Study the effect of the friction stir process on the microstructure and mechanical behavior of the AZ31 as-cast alloy joint
  Amir Rezaee Iman Ebrahimzadeh Farhad Gharavi
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  47 - The Effect of Magnesium on the Microstructure and Stress Rupture Properties of Hastelloy X Supealloy
  Masumeh seifollahi Afagh panahi moghaddam seysd Mahdi Abbasi seyed Mahdi ghazi mir saeed
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  48 - Evaluation of Microstructure and Tensile Behavior of Fine-Grained AZ61 Alloy Tube Processed by Severe Plastic Deformation
  Milad AAli Ghader Faraji Mohammad Reza Sadrkhah Ali Fata Mohammad Jafar Hadad
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  49 - Influence of electroplating parameters on microstructure and amount of ceramic particle deposition in Ni-Co-CeO2 composite coating
  Afsaneh Afzali Gorouh Morteza Zandrahimi Hadi Ebrahimifar
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  50 - Utilization of Microalloying with Rare Earth Elements and Hot Extrusion for Remarkable Grain Refinement and Enhancement of Mechanical Properties of as-Cast Magnesium Alloy
  Hooman Abedi Massoud Emamy Hamed Mirzadeh Jafar Rassizadehghani M. Ra'ayatpour
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  51 - Mechanical Behavior of the Copper Matrix Composite Reinforced by Steel Particles
  Vahid Norouzifard Ashkan Nazari Siahpoush Amir Talebi
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  52 - Effect of temperature and activator molar of Na2O to SiO2 in the process of synthesis and microstructure of cement geopolymer
  M Asadi A Nemati R Naghizadeh K Arzani J Fahim
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  53 - The Effect of Microstructure on Estimation of the Fracture Toughness (KIC) Rotor Steel Using Charpy Absorbed Energy (CVN)
  A Salemi Golezani
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  54 - Numerical Simulation Of Heat Affected Zone Microstructure During Laser Surface Melting
  M Amin Jabbareh H Asadi
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  55 - Influence of shielding gas composition on weld structure in pulsed Nd: YAG laser welding
  M jokar F MalekGhaini M. J. Torkamany
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  56 - The Effect of Cross-Rolling Process on Nanostructure of Al 1050 Alloy
  Mohsen Asadi Asadabad Mohammad Jafari Eskandari Reza Tafrishi Mojtaba Bagherzadeh
  10.22034/jna.2014.02.006
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  57 - An Investigation on the Microstructure and Impression Creep Behavior of the Magnesium Alloys
  Ehsan Kermani Farid Biniyazan Behzad Rezaee Hamid Soleimanimehr
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  58 - Improving the Hardness and Microstructural Properties of Piston Alloy Using the FSP Method
  Mostafa Akbari Parviz Asadi Hossein Rahimi Asiabaraki
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  59 - Development of New Technique for Reverse Engineering by Microstructure Features Detection
  Ahmed Hebatalrahman
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  60 - Effect of Overage Hardening Heat Treatment on the Micro Structure and Hardness of Nickel-based Super Alloy Rene-80
  Mahmoud Moradi Mohammad Meghdad Fallah Fallah Mahdi Kazazi Mahdi Vahdati
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  61 - The Effect of the Third Element on Corrosion Behavior and Phase Structure of Fe35Mn Alloy Fabricated by Spark Plasma Sintering (SPS)
  Nahid Hasanzadeh Nemati Mahdis Parsafar
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  62 - Microstructure analysis of Zarab region, south of Kerman
  Farnaz Iranmanesh Amir Shafiei Bafti Sohrab Shahriari Mohsen Pourkermani
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  63 - خصوصیات ریزساختار و خصوصیات مکانیکی کامپوزیت های Al-SiCp
  G. Hemath Kumar M. Sreenivasan S. Muthu Kumar N. Dilip Raja
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  64 - Changing in the volatilities of Iran microstructure market by BARJAM
  Parinaz Jala
  In the recent years, high frequency trading is becoming more popular among financial analysts in Iran. To analyze these data need special methods because of microstructure noise effect. In this study, the goal is assessment of realized volatilities according to the BARJ More

  In the recent years, high frequency trading is becoming more popular among financial analysts in Iran. To analyze these data need special methods because of microstructure noise effect. In this study, the goal is assessment of realized volatilities according to the BARJAM effect from May to October in 2014 and 2016. This study uses the information about crucial Iran indices: Total index, Bank, Oil Industry Investment, Petrochemical Industry Investment and Automobile Industry indices. To estimate Integrated Matrix using “Pre-averaging” because this approach is able to control the effect of microstructure noise and, “Hayashi-Yoshida” is used to synchronization among indices.  Moreover, the price jumps are removed to get more accurate estimator. The study of daily volatilities and their comparison show a positive effect of BARJAM on Total index, Bank and Oil Industry Investment, but there is not noticeable influence in Automobile Industry and Petrochemical Industry Investment. Finally, time series is modeled to forecast the volatility of indices in a short term. Manuscript profile
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  65 - Effect of Cr/C ratio on Microstructure and Thermal Fatigue life of the Fe-Cr-C Hardfacing alloy
  حامد ثابت
  In this Investigation two type of hard face coated electrodes (Fe-Cr-C) used as a hard facing alloys with different ratio Cr/C. The welding of hard facing electrodes were done in similar heat-input but in different of deposited layers on ST32 mild steel. The OES, OM, SE More

  In this Investigation two type of hard face coated electrodes (Fe-Cr-C) used as a hard facing alloys with different ratio Cr/C. The welding of hard facing electrodes were done in similar heat-input but in different of deposited layers on ST32 mild steel. The OES, OM, SEM and XRD techniques used for determining of chemical analysis and study of microstructure characteristics of hard face samples. In addition the thermal fatigue test were done at 600-25 OC for different samples and hardness test used for determining the hardness of hard face layers. The XRD examination Results indicated that microstructure of hard facing layer sample (AB electrode) includes primary carbides and eutectic (), the microstructure of hardfacing layer sample (SD electrode) includes austenite+martensite. The hardness result indicated that hardfacing samples (AB electrode) have maximum hardness which 52-58HRC and hard facing samples (SD electrode) with austenite + martensite microstructure have minimum Hardness (30-50 HRC). The thermal fatigue Test results indicated, the highest fatigue life related to the sample that hard-faced with the SD electrode (Ø=4 mm) at a single layer and the lowest thermal fatigue life related to the sample that hard-faced with AB electrode (Ø=3.25 mm) at two layers. It was also found that there is an inverse relationship between hardness and thermal fatigue life of specimens. Manuscript profile
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  66 - Influence of Cold Rolling and Annealing on Microstructure and Tensile Properties of Hastelloy X Superalloy
  حمید فیض آبادی سید مهدی عباسی مریم مرکباتی رشید مهدوی محمدرضا توکلی
  In this study, the effects of cold rolling and intermediate and final annealing on the microstructure and tensile properties of Hastelloy X alloy was investigated. Three-stage cold rolling followed by intermediate annealing at 1175 ºC for 0.5 hr were performed on 1 More

  In this study, the effects of cold rolling and intermediate and final annealing on the microstructure and tensile properties of Hastelloy X alloy was investigated. Three-stage cold rolling followed by intermediate annealing at 1175 ºC for 0.5 hr were performed on 10 mm thick strip at hot rolled and solution annealed condition to obtain the final thickness of 1.25 mm. The specimens prepared for tensile test within temperature range 660- 860 ºC, annealed at 1100-1200ºC for 1 hr. Microstructural investigation of the specimen’s solution annealed at temperature 1175 ºC indicated the matrix is austenite and dispersed particles are M6C carbides which are molybdenum rich precipitates. Hot tensile test results for specimens annealed at 1100, 1150 and 1200 ºC indicated a minimum ductility, at 760, 760 and 860 ºC, respectively. Tensile tests showed that the yield strength of the alloy had a weak temperature-dependence for temperature range 660- 860ºC, due to precipitation of molybdenum rich M6C carbides. Manuscript profile
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  67 - Investigating the Effect of Al Temper type on Microstructure and Mechanical properties of Al 6061/Mg AZ31 alloys Diffusion Bonded Joint
  مجتبی جعفریان علیرضا خدابنده مرتضی جعفریان
  In this study, the effect of Al alloy temper type on the microstructure and mechanical properties of Al 6061 (T6,O) and Mg AZ31 (O) were investigated. The interface of joints was investigated by optical microscope (OM) and Scanning Electron Microscope (SEM) equipped wit More

  In this study, the effect of Al alloy temper type on the microstructure and mechanical properties of Al 6061 (T6,O) and Mg AZ31 (O) were investigated. The interface of joints was investigated by optical microscope (OM) and Scanning Electron Microscope (SEM) equipped with EDS and Linescane analysis. Mechanical properties of joints were measured by using a Vickers microhardness and shear strength tests. According to the results, in Al 6061-O/Mg AZ31 joint, less plastic deformation in the Mg alloy, further diffusion rate of Mg atoms in the Al alloy and the formation of diffusion region with the lowest amount of microhardness (140 HV) and the highest amount of shear strength (32 MPa) was occurred compared to Al 6061-T6/Mg AZ31 joint. Evaluation of fracture surfaces indicates the occurrence of the failure in brittle phase of Al3Mg2. Manuscript profile
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  68 - Characterization of Cu-Yttria Stabilized Zirconia composite produced by Spark Plasma Sintering
  جعفر میرعظیمی پروین عباچی کاظم پورآذرنگ وحید بابایی
  In applications like sliding electrical contacts good electrical/thermal conductivity as well as wear resistance is required besides suitable mechanical properties. Furthermore, in these types of applications it is necessary to be prevented from local welding of various More

  In applications like sliding electrical contacts good electrical/thermal conductivity as well as wear resistance is required besides suitable mechanical properties. Furthermore, in these types of applications it is necessary to be prevented from local welding of various parts of pieces to each other. Although the addition of ceramic particles to a conductive metal like copper can lead to decrease of above mentioned physical properties, the producing of copper matrix composites can induce high tensile strength, better wear resistance, and resistance to electrical current with high amperage improvement. Hence, at the present study, the copper based composites containing 2, 3 and 5 vol. % ultra-fine grained yttria stabilized zirconia (YSZ) particles were produced by powder metallurgy and spark plasma sintering (SPS) method. The distribution of reinforcing particles at the microstructure was carefully studied using electron microscopy. Additionally, the density, hardness and thermal conductivity values of the specimens were measured. Referring to the results, microstructural analysis showed satisfactorily distribution of reinforcement particles in copper matrix and the clustering of particles is not so noticeable. The relative density up to 95% for all specimens was obtained due to the sintering procedure. As a result of the presence of hard stabilized zirconia particles, an increase of 60 percent in the Brinell hardness of the Cu-5 vol.% YSZ composite sample was observed in comparison with unreinforced copper. Moreover, the determined thermal conductivity values decreased from 397 to 241 W/m K with increasing of reinforcement content from 0 to 5 vol. %. The variation in the thermal conductivities can be related to the microstructural characteristics such as reinforcement and porosity volume percent as well as other microstructural defects. Manuscript profile
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  69 - Investigation of microstructure and mechanical properties of AISI304L Stainless Steel to ASTMA514 Steel joint by Gas Tungsten Arc Welding
  موسی توکلی عباس سعادت محمدرضا خانزاده قره شیران
  In the present study, Dissimilar welding of austenitic   stainless steel AISI 304L to Quenched and Tempered Steel ASTM A514 was investigated by gas tungsten arc welding process. Two filler metals including (ERNiCr-3) and austenitic stainless steel 309l (ER309L More

  In the present study, Dissimilar welding of austenitic   stainless steel AISI 304L to Quenched and Tempered Steel ASTM A514 was investigated by gas tungsten arc welding process. Two filler metals including (ERNiCr-3) and austenitic stainless steel 309l (ER309L) were used. Microstructure of nugget, heat affected zone, inter face and unmixed zone (UMZ) was studied by optic microscopy and scanning electron microscopy equipped with energy disperse spectrometry (EDS). The investigations showed completely austenitic structure as dendrite for ERNiCr-3 weld metal and primary ferrite with austenitic matrix for 309l weld metal. Mechanical properties including tensile and bending strength, impact resistance, hardness and fractography of the specimen was studied. The entire specimen underwent ductile fracture in HAZ in the tension test. Tensile strength in ER309L and ERNiCr-3 had increment of 556 Mpa and 593 Mpa respectively. Impact thoughtless in join induced by ERNiCr-3 filler was 117 J while it was 95 J for ER309L. The maximum and minimum hardness was related to the ERNiCr-3 (156 Vickers) and ER309L (127 Vickers), respectively. Finally, according to mechanical properties, it can be concluded that in dissimilar welding of austenitic stainless steel AISI 304 L to Quenched- Tempered Steel ASTM A514, The ERNiCr-3 filler is better than ER309L. Manuscript profile
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  70 - Study the microstructure and hardness of FSW of API 70 steel at the presence of TiO2 particles
  Rasoul Pouriamanesh KAMRAN Dehghani
  In this study, the microstructural properties and hardness of Friction Stir Welded (FSWed) of high strength low alloy API X70 steel at the presence of titanium dioxide (TiO2) particles were investigated. In this regard, a homogeneous mixture of TiO2 and X70 steel powder More

  In this study, the microstructural properties and hardness of Friction Stir Welded (FSWed) of high strength low alloy API X70 steel at the presence of titanium dioxide (TiO2) particles were investigated. In this regard, a homogeneous mixture of TiO2 and X70 steel powders were inserted into the weld groove before applying FSW. The FSW method was applied on HSLA X70 with and without addition of titanium oxide (TiO2) particles. The optical microscopy and Vickers microhardness measurements were employed to evaluate the microstructure and hardness of the different weldments zones. The results showed that the hardness of various zones in the weldment are strongly depended on the microstructure which is affected by heat input and stiring action. In addition, the TiO2 particles were homogenously dispersed in the stir zone of TiO2-doped weldment and subsequently has changed the microstructure and hardness. In particular, a transition from an acicular ferrite (AF) dominant microstructure with a hardness value of 300 HV to a polygonal ferrite (PF) dominant microstructure with a hardness value of 180 HV was observed by moving from top surface region to near root region. Manuscript profile
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  71 - The effect of calcium on corrosion behavior of biodegradable Mg-5Zn-1Y Alloy
  Fereshteh Dostmohamadi Hasan Jafari
  Today, magnesium alloys as the new generation of biodegradable alloys, have attracted the attention of many researchers. In this research, the corrosion behavior of cast Mg-5Zn-1Y containing different amounts of calcium (0, 0.1, 0.5 and 1 weight percentage) was investig More

  Today, magnesium alloys as the new generation of biodegradable alloys, have attracted the attention of many researchers. In this research, the corrosion behavior of cast Mg-5Zn-1Y containing different amounts of calcium (0, 0.1, 0.5 and 1 weight percentage) was investigated. The microstructure of the alloys was analyzed using optical and scanning electron microscopes, and the corresponding phases were detected by X-ray diffraction. Corrosion behavior of cast alloys was measured using electrochemical polarization and immersion tests. Metallography analysis revealed that microstructure of the Mg-5Zn-1Y alloy includes α-Mg matrix and Mg3YZn6 lamellar phase formed at the grain boundary. The addition of calcium to the alloy refined the grains and resulted in the formation of continuous Ca2Mg6Zn3 at grain boundaries. No passive zone was detected in polarization curves, meaning domination of active polarization, indicating increased corrosion rate due to grain refinement which can be attributed to calcium addition in the alloy. The polarization and immersion tests results confirmed that the alloy Mg-5Zn-1Y-0.1Ca has the lowest corrosion rates among the investigated alloys, and the more the calcium content, the higher the corrosion rate due to the formation of cathodic Ca2Mg6Zn3 phase. Manuscript profile
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  72 - Investigation the Effect of Microstructure and Crystallographic Texture on the Hydrogen Induced Cracking Resistance of HSLA Steel
  shahram abbasi mohammad esmailian Shahrokh Ahangarani
  In this study effect of microstructure and crystallographic texture on the hydrogen induced cracking resistance of a HSLA was investigated. Samples were hot rolled between 980 to 750 °C up to 50% and quenched in different environments. Microstructure and texture of More

  In this study effect of microstructure and crystallographic texture on the hydrogen induced cracking resistance of a HSLA was investigated. Samples were hot rolled between 980 to 750 °C up to 50% and quenched in different environments. Microstructure and texture of the samples were studied using a scanning electron microscope (SEM) equipped by electron backscattered diffraction detector (EBSD). Hydrogen induced cracking resistance of the samples were also evaluated using HIC test. Results revealed that, by increasing cooling rate more non-equilibrium phases with finer grain where formed. Grain boundary fraction also increased by increasing cooling rate which led to decrease in HIC resistance. Texture of the samples were also changed due to cooling rate enhancement furthermore texture intensity decreased. {111} // ND fiber intensity decreased due to cooling rate increase which led to decrease in intergranular crack propagation and consequently decrease in HIC resistance. Manuscript profile
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  73 - The effect of surface roughness and the current on the strength of stud welded pin
  محمد خدائی جواد مختاری
  Fast pin connecting to the steel parts to fasten cables and wires to the pipelines, anchors inside the cements to the steels structures and bolts inside the tanks is possible just using stud welding method. In this method an electric arc is established between pin and b More

  Fast pin connecting to the steel parts to fasten cables and wires to the pipelines, anchors inside the cements to the steels structures and bolts inside the tanks is possible just using stud welding method. In this method an electric arc is established between pin and base metal, and partially melt their surfaces, then by applying a pressure, pin and base metal will be jointed. Some parameters such as surface roughness, time of electric arc, the thickness of base metal and current, affect the quality of stud welding. In this research, steel pins are connected to a steel base metal at three different surface roughness and three different current using stud welding method. Results of scanning electron microscopy (SEM) indicates that when the surface of base metal is rough, the interface of joint increases from 50 to 95 percent by increasing the current from 160 to 200 ampere. But that when the surface of base metal is smooth, the interface of joint between pin and base metal decreases from 95 to 50 percent by increasing the current from 160 to 200 ampere. Also the interface of pin and base metal solidify in martensitic form, and the results of microhardness measurement confirms the higher harness of the interface regarding base metal and pin. According to the results of tension test, the maximum strength (400 MPa) was related to the P60-200A sample. Manuscript profile
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  74 - Investigation of Microstructure, Hardness and Intermetallic Compound in Friction stir Welding of AA6065 Aluminum Alloy to Copper
  مجید الیاسی Rahim Narimani Mortza Hosseinzadeh Hamed Aghajani Derazkola
  In this study, metallurgical properties lap joint of pure copper and 6065 aluminum alloy with friction stir welding technique were investigated. To purpose the metallurgical properties of joint optical microscopy, X-ray diffraction analysis (XRD), energy dispersive X-ra More

  In this study, metallurgical properties lap joint of pure copper and 6065 aluminum alloy with friction stir welding technique were investigated. To purpose the metallurgical properties of joint optical microscopy, X-ray diffraction analysis (XRD), energy dispersive X-ray (EDS) and Vickers hardness junction of micro gauge were used. The results shows that due to the direct contact between aluminum alloy and tool shoulder, the microstructure change of AA6065 was more than copper. With increasing tool rotation speed the microstructure size of AA6065 and copper became smaller and with increasing linear speed and cooling rate, the microstructure size of base material became more. The results shows that the structured layers were formed in stir zone which with increasing heat generation they geometry became thinner and stretcher. The combination of base materials in high tool rotation and low travelling speed caused the CuAl2 and Cu9Al4 intermetallic compounds were formed in base metal interface. For changes in microstructure size and formation of intermetallic compounds, the hardness of stir zone was more than other area of joint. The maximum hardness of joint area was 111 Vickers which allocated to the joint that welded with 1130 rpm and 24mm/min tool speed. Manuscript profile
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  75 - Efect of temperature on microstructure and intermetallic compound formation of Diffusion Bonded Mg/Al joints
  Mohammad Ammar Mofid Mostafa Hajian Heidary Ehsan Loryaei Hatef Shakeri
  The diffusion bonding of two dissimilar alloys Al 5083 and Mg AZ31 was carried out at 420,430.440 and 450 °C for bonding time of 60 min. In order to characterize the microstructure evolution in the joint zone, scanning electron microscopy (SEM), energy dispersive sp More

  The diffusion bonding of two dissimilar alloys Al 5083 and Mg AZ31 was carried out at 420,430.440 and 450 °C for bonding time of 60 min. In order to characterize the microstructure evolution in the joint zone, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) were applied. The results show that joint formation is attributed to the solid-state diffusion of Mg and Al into Al 5083 and Mg AZ31 alloys followed by eutectic formation and constitutional liquation along the interface. At bonding temperature of 430°C diffusion induced grain coarsening was observed at the interface. With increase in bonding temperature, the atomic diffusivity increases, results in easier and speeder chemical bonding. In bonding temperature of 440°C the weld had an irregular shaped region in the weld center, having a different microstructure from the two base materials. The irregular shaped region contained a large volume of intermetallic compound Al12Mg17 and showed significantly higher hardness in the weld center. The present study suggests that constitutional liquation resulted in the intermetallic compound Al12Mg17 in the weld center. Manuscript profile
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  76 - Phase transformations during high temperature brazing of dissimilar bonding of IN738 to TiAl intermetallic compound using Ni-Si-B ternary filler alloy
  Dariush Kokabi Ali Kaflou Majid Pouranvari Reza Gholamipour
  10.30495/apme.2021.681602
  In this research microstructural evolution during high temperature brazing of dissimilar bonding of IN738 Ni-base superalloy to TiAl intermetallic compound using an amorphous Ni-Si-B ternary alloy was investigated. Phase transformations via solidification and solid stat More

  In this research microstructural evolution during high temperature brazing of dissimilar bonding of IN738 Ni-base superalloy to TiAl intermetallic compound using an amorphous Ni-Si-B ternary alloy was investigated. Phase transformations via solidification and solid state reactions are discussed. Observations indicated that the microstructure of IN738/MBF-30/TiAl joint consist of four different zones; isothermal solidification zone in both sides, athermally solidified zone in the bond center, diffusion affected zone in the IN738 side and reaction layer in the TiAl side. γ-Ni solid solution phase in ISZ of the IN738 side and binary isostructural solid solutions in ISZ of the TiAl side were formed during holding time at bonding temperature. Ni-Cr borides have been formed due to binary eutectics associated with γ-Ni solid solution in the ASZ during cooling. Cr-Mo borides and Ni-rich boride with different morphologies were precipitated in the DAZ. Ni element from MBF-30 molten interlayer reacted with γ-TiAl base, leading to the formation of the reaction layer containing single phase δ-Ti2Ni and triple phase τ2-Al2TiNi+τ4-AlNi2Ti+β1-NiAl layers adjacent to TiAl substrate. Microhardness evaluation of different zones indicated that some high hardness phases have formed in the bond region and presence of the γ-Ni solid solution in the ASZ cause to decrease the detrimental effects of them.  Manuscript profile
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  77 - The effect of Al2O3 Nano-particles coated with manganese oxide on the microstructure and mechanical properties of low carbon steel using GMAW process
  farzad pahnaneh masood aghakhani farid naeimi , Moeen Mansoubi
  10.30495/apme.2021.681628
  This paper reports an investigation carried out to determine the effect of aluminum oxide Nano-particles coated with manganese on the microstructure and mechanical properties of single-pass butt joint of low carbon steel plates of 6.0 mm thicknesses using gas metal arc More

  This paper reports an investigation carried out to determine the effect of aluminum oxide Nano-particles coated with manganese on the microstructure and mechanical properties of single-pass butt joint of low carbon steel plates of 6.0 mm thicknesses using gas metal arc welding process. After selecting appropriate welding parameters and adding 0.25 gr and 0.5 gr of Nano-particles into the joint line and carrying out the welding, the samples were prepared for micro hardness and tensile tests. Furthermore, the sample with optimum Nano-particles having the highest ultimate tensile strength and without having any visible and metallurgical defects in the microstructure was selected for further investigation.  Subsequently, microstructures of the weld without and with optimum Nano-particles were studied using optical microscopy and scanning electron microscopy (SEM) and the fractured surface of the weld obtained from tensile testing was investigated for the samples without Nano particles and the optimum sample with Nano materials were studied. The results show that Nano-particles added to the weld pool penetrated into the weld zone and helped in formation of acicular ferrite in the microstructure. Based on the results obtained, ultimate tensile strength and percentage of elongation of samples without Nano-particles and with optimum Nano-particles were increased from 387 MPa and 6.8% to 408 MPa and 13.6%, respectively. In addition, the average hardness of the weld metal without Nano-particles and with optimum Nano-particles were increased from 158 VHN to 172 VHN respectively Manuscript profile
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  78 - Modification of Microstructure and Enhancing Mechanical Properties of as-cast AZ91 Magnesium alloy via Friction Stir Processing
  Hassan Jiryaei Sharahi Majid Pouranvari Mojtaba Movahedi
  10.30495/apme.2021.681639
  Magnesium alloys, as the lightest structural alloys, due to their high strength-to-weight ratio offer significant potential for improving energy efficiency of various transportation systems. This paper addresses the influence of friction stir processing (FSP) treatment More

  Magnesium alloys, as the lightest structural alloys, due to their high strength-to-weight ratio offer significant potential for improving energy efficiency of various transportation systems. This paper addresses the influence of friction stir processing (FSP) treatment on the microstructure and mechanical properties of cast AZ91 Mg alloy. It is demonstrated that FSP treatment enables elimination of dendritic structure, significant grain refining, break-up and partial dissolution of coarse β and formation of ultra-fine sub-micron Mg17Al12 particles. These microstructural modifications resulted in enhancement of mechanical properties in terms of tensile strength and energy absorption by 48% and 283%, respectively. It is shown that FSP treatment altered the failure mechanism of the alloy from brittle cleavage-dominant mode to ductile dimple-dominant mode which can increase the potential of Mg alloys to use in safety-critical application. Therefore, it can be concluded that FSP, as a process of sever plastic deformation at high temperature, has a great potential to tailor the microstructure and enhancing the mechanical properties of cast Mg alloys. Manuscript profile
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  79 - Effects of Heat Treatment on the Microstructure, Mechanical Properties and Corrosion Behavior of 2209 Duplex Stainless Steel Parts Manufactured By Wire Arc Additive Manufacturing Process
  Ali A. Molazadeh Kashkouie Mahmood Sharifitabar Mahdi Shafiee Afarani
  The present study deals with the fabrication and investigation of structure, microstructure, mechanical properties and corrosion resistance of 2209 duplex stainless steel parts made by wire arc additive manufacturing method. The formation of ferrite and austenite phases More

  The present study deals with the fabrication and investigation of structure, microstructure, mechanical properties and corrosion resistance of 2209 duplex stainless steel parts made by wire arc additive manufacturing method. The formation of ferrite and austenite phases was confirmed by XRD analysis. There was a non-uniform distribution of ferrite and austenite phases in the microstructure of the as-welded microstructure. The tensile and Vickers microhardness tests were employed to evaluate mechanical properties. The results showed that the mean values of yield and tensile strengths were respectively 2.7 and 5.5% higher and the elongation was 4.5% lower in the welding direction than the building direction. Post-processing heat treatment at 1000 °C for 30 min led to the grain refinement of the alloy, the formation of equiaxed microstructure, increase in the austenite volume fraction, and increasing the mean hardness from 318 to 376 HV. The fractography of the tensile test specimens revealed the ductile fracture mode in all samples. Corrosion test results showed that the heat treatment improved the corrosion resistance of the alloy. Manuscript profile
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  80 - Effect of Rotational Speed on Microstructure and Mechanical Properties of AA5456 Alloy Welded by FSW-Lap Joint
  mohamad ali safarkhanian
  Friction stir welding process is solid state welding method that does not have many common defects in fusion methods. In this method for creating optimum weld, some parameters should be optimized, such as welding tool geometry, rotational speed and travel speed. The aim More

  Friction stir welding process is solid state welding method that does not have many common defects in fusion methods. In this method for creating optimum weld, some parameters should be optimized, such as welding tool geometry, rotational speed and travel speed. The aim of this study was to investigate the effect of rotational speed on microstructure and mechanical properties of friction stir lap welding AA5456 in rotary state to optimize the parameter values. For this purpose, Welding process was performed in rotating state, rotating tool was plunged from the cold-worked tube (AA 5456-H321 with 5 mm thickness) surface into the surface of Annealed tube (AA 5456-O with 2.5 mm thickness) and lap joints were produced by rotational speeds of 300, 500, 700 and 900 rpm and welding speed of 45 mm/min. Macro and microstructure of weld cross sections by optical microscopy (OM) and scanning electron microscopy (SEM) were studied. Then the hardness profile and tensile shear test were obtained and compared to another. Finally the fracture surfaces of some samples were examined by using a scanning electron microscope (SEM). The Macro and microstructure results show that increasing of rotation speed, increases the vertical flow of material, the height of hook as well as fine-grained sediments in the nugget zone. Increasing the rotational speed, decreases hardness of weld nugget. The results of tensile shear test show that the welding parameter of (700 rpm- 45 mm/min) is the optimal combination of parameters in this study. Manuscript profile
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  81 - Influence of Heat Treatment on Microstructure and Mechanical Properties of HVOF Sprayed Cr3C2-NiCr Coating
  Pejman Zamani Moghadam Reza Ghasemi Behnaz saeedi Hamid Dahaghin Farhad Shahriari Mahmood Memari
  Deposition of the Cr3C2-NiCr cermet by the HVOF process results in the dissolution of Cr3C2 in the NiCr metal phase and decreasing the hardness and the elastic modulus of the resulting coating. In this study, Cr3C2-25wt% (Ni-20Cr) powder was applied to Hastelloy X super More

  Deposition of the Cr3C2-NiCr cermet by the HVOF process results in the dissolution of Cr3C2 in the NiCr metal phase and decreasing the hardness and the elastic modulus of the resulting coating. In this study, Cr3C2-25wt% (Ni-20Cr) powder was applied to Hastelloy X super alloy substrates by high velocity oxy-fuel (HVOF) process. Influence of heat treatment on Cr3C2 phase recovery and improvement of hardness and elastic modulus of coatings was investigated. For this purpose, microstructural examination performed by field emission scanning electron microscopy and phase composition analysis by X-ray diffraction (XRD) analysis on the coating before and after heat treatment. Analysis of back scattered electron microscopy images showed that up to 11% of the dissolved carbide phases in the NiCr alloy recovered during heat treatment. In the XRD patterns of the heat-treated coatings, the amorphous regions disappeared and the NiCr peaks pronounced more in the background phase pattern. Also, the hardness and elastic modulus of coating after heat treatment increased by 156 HV0.3 and 98 GPa, respectively.   Manuscript profile
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  82 - Correlation of Microstructure with Mechanical Behavior of HSLA-100 Weld Metal Produced By GTAW Method
  Mahyar Darivandpour Reza Dehmolaei Khalil Ranjbar
  10.30495/apme.2021.1910558.2016
  In this study, welding of high strength low alloy steel, HSLA-100 was performed using three fillers metals, cut from base metal (HSLA-100), ER100S-G and ER120S-G by GTAW procedure. Microstructural studies were conducted using optical and scanning electron microscopes. T More

  In this study, welding of high strength low alloy steel, HSLA-100 was performed using three fillers metals, cut from base metal (HSLA-100), ER100S-G and ER120S-G by GTAW procedure. Microstructural studies were conducted using optical and scanning electron microscopes. Tensile, impact and hardness tests were also used to evaluate the mechanical properties of the joint. The results showed that the microstructure of HSLA-100 weld metal included granular bainite and polygonal ferrite, ER100S-G weld metal consisted of acicular, Widmannstatten and grain boundary ferrites and ER120S-G weld metal comprised of acicular, polygonal and quasi-polygonal ferrites. Furthermore, the formation of a secondary phase (constituent) of martensite / austenite (M / A) was observed in the microstructure of all weld metals. The predominant form of this phase in HSLA-100 and ER100S-G weld metals was blocky type and formed along the prior austenite grain boundries and in ER120S-G weld metal was in the form of stringer type. The results of mechanical tests demonstrated that among weld metals, ER120S-G weld metal had the highest tensile strength (859 MPa), percent elongation (22%), impact toughness (45 joule) and hardness (294.7 HV30). whilst, the ER100S-G weld metal had the lowest tensile strength (775 MPa) and hardness (268.4 HV30) and the HSLA-100 weld metal had the lowest impact toughness (25 Joule). Manuscript profile
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  83 - Effect of bonding time on microstructure and completion of isotherm solidification during TLP bonding of dissimilar nickel base superalloys IN738LC and Nimonic 75
  Meysam Khakian Ghomi Mohammad Saeid Shahriari Saeid Nategh
  10.30495/apme.2021.510140.1047
  Joining of Inconel 738 and Nimonic 75 nickel base superalloys using Ni-Cr-B-containing interlayer, MBF-80, performed by transient liquid phase process (TLP) at 1080, 1120, 1150 and 1180°C and different times. Bonding microstructure was studied using a scanning elect More

  Joining of Inconel 738 and Nimonic 75 nickel base superalloys using Ni-Cr-B-containing interlayer, MBF-80, performed by transient liquid phase process (TLP) at 1080, 1120, 1150 and 1180°C and different times. Bonding microstructure was studied using a scanning electron microscope (SEM) and a light microscope. Microstructural studies showed that in short bonding time, the microstructure consists of continuous eutectic intermetallic phases in the center line of the joint and with increasing bonding time at constant temperature, eutectic intermetallic phases gradually decrease from the bonding and finally completely disappear. In order to predict the time required to isotherm solidification completion, Fick’s diffusion equations were used and it was observed that there is a good agreement between the predicted time of isotherm solidification completion and experimental results. Manuscript profile
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  84 - Effect of Aging Time on Microstructure and Mechanical Properties of IN617 Superalloy at 900 °C
  mohsen mehdizadeh hassan farhangi
  Microstructural changes and mechanical properties of IN617 superalloy aged at 900 °C for different durations from one hour to 2000 hours were investigated in the present work. The optical microscope (OM), scanning electron microscope (SEM), transition electron micro More

  Microstructural changes and mechanical properties of IN617 superalloy aged at 900 °C for different durations from one hour to 2000 hours were investigated in the present work. The optical microscope (OM), scanning electron microscope (SEM), transition electron microscope (TEM), X-ray diffraction (XRD) and hardness and tensile tests were used to investigate the microstructure and mechanical properties of aged alloys. A significant amount of intergranular carbides were observed in the microstructure of aged alloys even in the microstructure of alloy which was aged for one hour. Block-shape carbides were observed in the sample which was aged for one hour. It was observed that with increasing the aging time the morphology of the carbides changed to quasi-spherical, plate and rod shaped. The carbides were first formed along the grain and twin boundaries and then within the grains, and continues carbide layer was observed along the grain boundaries for the sample which was aged for 2000 hours. Most of the carbides were M23C6 and a small percentage of them were determined to be M6C. Furthermore, it was observed that a small amount of Ti(C,N) phase which was present in the as received sample was converted to carbides after aging for 1500 hours. γ' phase was only observed in the  microstructure of sample which was aged for one hour. Mechanical test results shown that  the hardness, ultimate strength at room temperature and at 750°C increased with increasing the aging time, but after 2000 hours of aging these properties decreased to the values of as received sample. The impact energy of the sample which was aged for 2000 hours was equivalent to 25% of as received sample due to the formation of a continues carbide layer along the grain boundaries. The fracture surface of the impact samples were investigated and it was observed that fracture mode changed from ductile for as-received sample to brittle intergranular fracture for the samples which were aged for more than 100 hours. Manuscript profile
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  85 - Study of the microstructure and metallurgical properties in tungsten inert gas welded Incoloy 925 superalloy
  Ali Mortazaei Ehsan Ghajavand
  In this research, welding of Incoloy 925 nickel-iron based superalloy was examined in order to investigate the effect of chemical composition of used filler metals on the microstructure, mechanical properties and corrosion resistance of welded zones. For this purpose, s More

  In this research, welding of Incoloy 925 nickel-iron based superalloy was examined in order to investigate the effect of chemical composition of used filler metals on the microstructure, mechanical properties and corrosion resistance of welded zones. For this purpose, shielding gas tungsten arc welding process and two nickel-base filler metals including ERNiCrMo-3 and ERNiCr-3 were used. Morphological observations showed that at the end of solidification, microstructure of weld metals were stabilized in the form of austenitic with dendritic morphology. In addition, in tensile test although tensile strength of weld metals were lower than Incoloy 925 base alloy but rupture in specimens occurred in heat-affected zone of base metal. In charpy impact test, ERNiCr-3 weld metal was broken by more attracting fracture energy compared to Incoloy 925 base metal and ERNiCrMo-3 weld metal. By performing potentiodynamic polarization test also determined that the corrosion potential difference between base metal and ERNiCrMo-3 weld metal can persuade occurrence of galvanic corrosion in the joint. Finally, with regard to the achieved results, ERNiCr-3 filler metal was diagnosed better selection for welding of Incoloy 925 superalloy. Manuscript profile
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  86 - Effect of Friction Stir Welding (FSW) on Corrosion Behavior of Pure Copper in 3.5 % wt NaCl Solution
  amirhossein taheri Arash Fattah-alhosseini
  In the present study, the effect of friction stir welding (FSW) on the corrosion behavior of pure copper in 3.5 % wt NaCl solution was investigated. For this purpose, pure copper was welded using a rotation speed of 355 rpm and welding speed of 20, 28, and 40 mm/min. Th More

  In the present study, the effect of friction stir welding (FSW) on the corrosion behavior of pure copper in 3.5 % wt NaCl solution was investigated. For this purpose, pure copper was welded using a rotation speed of 355 rpm and welding speed of 20, 28, and 40 mm/min. The microstructures of the pure copper and welded pure copper were evaluated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Also, corrosion behavior of the specimens was investigated using Tafel polarization, and electrochemical impedance spectroscopy (EIS) in 3.5 % wt NaCl solution. Results revealed that FSW decreased the grain size of pure copper and improved the corrosion resistance of the stir zone. Manuscript profile
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  87 - The effect of addition nano boron carbide on the mechanical properties and pressurless sintering of B4C-5% vol TiB2 composites
  Nahid Ahmadi Hamaidreza Baharvandi Naser Ehsani
  In this study the effect of the addition of nano boron carbide on mechanical properties and sintering behavior of B 4 C-TiB 2 composite has been investigated. 0, 7, 14 and 20 wt% nano boron carbide were added to the starting powder and sintered by pressurless sinte More

  In this study the effect of the addition of nano boron carbide on mechanical properties and sintering behavior of B 4 C-TiB 2 composite has been investigated. 0, 7, 14 and 20 wt% nano boron carbide were added to the starting powder and sintered by pressurless sintering at 2200 ° C. Under the experimental conditions of this study, the maximum properties of boron carbide composite with 20 wt% nano boron carbide was obtained so that the relative density equal to 97/2 %, micro- hardness was 31/9 GPa, and fracture toughness was 3/59 MPa.m 1/2 . Manuscript profile
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  88 - تحلیل تجربی و عددی آهنگری سرد دورانی چرخ‌دنده مخروطی با آلیاژ 16MnCr5
  سعید بهشتیان مسگران محمد علی صادقی
  هدف از این تحقیق، تحلیل و بررسی فرایند آهنگری مرسوم چرخ‌دنده مخروطی با شماره مواد 7131/1 به روش المان محدود به کمک نرم‌افزار (SUPER FORGE) و مقایسه آن با آهنگری سرد دورانی بر اساس آزمایش‌های عملی است. بعد از انجام شبیه‌سازی بر روی آهنگری مرسوم و به‌دست آوردن تناژ پرس در More

  هدف از این تحقیق، تحلیل و بررسی فرایند آهنگری مرسوم چرخ‌دنده مخروطی با شماره مواد 7131/1 به روش المان محدود به کمک نرم‌افزار (SUPER FORGE) و مقایسه آن با آهنگری سرد دورانی بر اساس آزمایش‌های عملی است. بعد از انجام شبیه‌سازی بر روی آهنگری مرسوم و به‌دست آوردن تناژ پرس در روش آهنگری دورانی توسط نرم‌افزار DEFORM ، قالب­های آهنگری اوربیتال ساخته شد. از آنجایی که تولید چرخدنده مخروطی به روش آهنگری مرسوم دارای سه مرحله پیش فرم است، پس فرایند آهنگری بایستی به روش آهنگری داغ صورت گیرد. اما در فرایند آهنگری اوربیتال، چرخ‌دنده مخروطی تنها در یک مرحله و به صورت آهنگری سرد تولید می­شود. در انتها، ریز ساختار چرخ‌دنده­های تولید شده به روشهای آهنگری اوربیتال و ماشینکاری و ریز ساختار قالبها مورد بررسی قرار گرفته است. نتایج حاصل بیانگر این است که روش تولید قطعات قبل از انجام عملیات حرارتی تأثیر به‌سزایی بر ریز ساختار دارد. در آهنگری دورانی، میزان تناژ پرس به مراتب کمتر از تناژ در آهنگری مرسوم است و قدرت پرکنندگی حفره قالب از مواد خام در آهنگری دورانی به مراتب بیشتر از آهنگری مرسوم است. هندسه بیلت تأثیر به‌سزایی در پر کردن حفره قالب دارد. Manuscript profile
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  89 - Effect of Bonding Time on Microstructure and Mechanical Properties of Transient Liquid Phase Bonding Between WC-Co/St52
  Hamed Zeidabadinejad Mahdi Rafiei Iman Ebrahimzadeh Mahdi Omidi Farid Naeimi
  WC-Co and St52 were joined using the TLP method. The joining process was carried out at 1050 °C for different times using a BNi-2 interlayer. After the joining process, the microstructure of the bonded samples was examined using a scanning electron microscope equipped w More

  WC-Co and St52 were joined using the TLP method. The joining process was carried out at 1050 °C for different times using a BNi-2 interlayer. After the joining process, the microstructure of the bonded samples was examined using a scanning electron microscope equipped with energy-dispersive X-ray spectroscopy. X-ray diffraction analysis was also used to investigate the effects of bonding parameters on the phase transformations of the bonding region. The results of the investigations showed that in the isothermal solidification zone, the Ni-base solid solution phase was observed in all samples. Also, the η phase (Co6W6C) was formed in the diffusion affected zone of the WC-Co base material. The size of the produced zones in the bonding region depended on the time of the bonding process, and with the change in the bonding time, the size of these zones also changed. The hardness profile for all samples had the same trend and the maximum hardness was related to WC-Co base material (around 1100 HV) and the hardness in the isothermal solidification zone was about 380 HV. The maximum shear strength was related to the bonded sample at 30 min, about 320 MPa, which was due to the removal and damping of residual stresses by the isothermal solidification zone. The mode of failure in all samples was brittle-ductile. Manuscript profile