stainless steel

In this study, the compressive stresses of dodecahedron diamond lattice structures have been investigated. The finite element method has been used for Stress analysis. After the simulation, it was found that more stresses are applied at the junction of the struts of thi More

In this study, the compressive stresses of dodecahedron diamond lattice structures have been investigated. The finite element method has been used for Stress analysis. After the simulation, it was found that more stresses are applied at the junction of the struts of this structure due to the application of compressive force. For this purpose, the connection point of the structure’s struts was strengthened by spherical connections, and a new type of dodecahedron structure was created. The validation and effect of spherical connections in compressive stresses have been evaluated experimentally. Two types of diamond lattice structures are made of stainless steel 316L by the SLM method. The results show that in the same condition, the use of spherical connections with twice the diameter of the structure’s struts helps to strengthen the structure and increase its compressive strength by 18% compared to the simple structure. Manuscript profile

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14 - Energy-Based Prediction of Low-Cycle Fatigue Life of CK45 Steel and SS316 Stainless Steel
M Shariati H Mehrabi

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15 - Non-Axisymmetric Time-Dependent Creep Analysis in a Thick-Walled Cylinder Due to the Thermo-mechanical loading
M Moradi A Loghman

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16 - Investigation of increasing surface hardness of 316L stainless steel using amorphous aluminum phosphate coating
tara bazdar Abdolmajid Eslami ahmad monshi Fatemehsadat Sayyedan Alireza Abbasloo

In this study, amorphous aluminum phosphate coating was applied on 316L stainless steel surface to increase hardness and chemical resistance. Amorphous means no crystal structure and grain boundaries due to the lack of weaknesses related to these two parameters. In this More

In this study, amorphous aluminum phosphate coating was applied on 316L stainless steel surface to increase hardness and chemical resistance. Amorphous means no crystal structure and grain boundaries due to the lack of weaknesses related to these two parameters. In this synthesis, ethanol-based aluminum nitrate nonahydrate and phosphorus oxide precursor solutions were used. It was heated to 70 ° C for 15 minutes to obtain a clear sol with 75% by weight of aluminum phosphate and a molar ratio of aluminum to phosphorus of 1.75. After activating the surface of steel plates and immersion in aluminum phosphate sol, it was heated in three stages of one minute for 24 hours at 65 ° C and 30 minutes at 500 ° C. Continuous X-RAY diffraction pattern proved the existence of an amorphous structure and showed that it is controlled with some extra aluminum. Scanning electron microscopy images and spectroscopic analysis showed that the peeling of the coating in marble-activated samples was better than that of Aqua-Regia and Loria. The microhardness test on the heat-treated sample at 500 ° C showed a threefold increase in hardness compared to the substrate metal. Manuscript profile

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17 - Evaluation of hot crack sensitivity and mechanical properties of ER310 welding metal in 304 stainless steel welding joints by applying electromagnetic vibration
mohammad amin ghadam dezfouli reza dehmolaei seyed reza alavi zaree

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18 - Simulation of clearance effect on LDR in stainless steel deep drawing
Ali Fathi Jokandan Mehrdad Ozve Aminian

Deep drawing is one of the most important processes in the sheet metal forming industry where a flat sheet is drawn by the punch into the hole matrix And It takes the shape of the punch. The effective parameter in this process  is clearance between punch and matrix More

Deep drawing is one of the most important processes in the sheet metal forming industry where a flat sheet is drawn by the punch into the hole matrix And It takes the shape of the punch. The effective parameter in this process  is clearance between punch and matrix. Finite element method is a useful tool for the study of process and impact parameters affecting it. In this project the effect of clearance between punch and matrix on LDR was considered and result are showed 0.9 mm clearance is more optimum suitable for 0.6 mm sheet thickness in deep drawing and decreased to 0.66 mm clearance the LDR was decreased. Manuscript profile

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19 - Electrochemical and Tribological Behaviour of Oxide Dispersion Strengthened Duplex Stainless Steel in Mine Water Environment
oladayo olaniran

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20 - Fabrication and Characterization of Nanostructure Functionally Graded Ni-P Electroless Coating
Sayede Razieh Anvari Sayed Mahmoud Monirvaghefi Mohammad Hossein Enayati

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21 - Isothermal and cyclic oxidation behavior of AISI 430 ferritic stainless steel coated with titanium
Saeed Keshavarz Morteza Zandrahimi Hadi Ebrahimifar

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22 - Characterization of SiO2-TiO2 Coatings on 316l Stainless Steel Substrates
Manuel Gutierrez Martinez Lizangela Guerra Barbara Bermudez Reyes Roberto Cabriales Luis Reyes

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23 - The Effect of Friction Stir Processing Speed Ratio on the Microstructure and Mechanical Properties of A 430 Ferritic Stainless Steel
Ali Salemi Golezani S. M Arab Sh. Javadi Firooz Kargar

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24 - Semiconducting properties of passive films formed on AISI 420 stainless steel in nitric acid solutions
Arash Fattah-alhosseini Mohammad Mehdi Khalvan

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25 - 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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26 - Effect of Thermomechanical Processing on the Microstructure and Mechanical Properties of a Duplex Stainless Steel
Maryam Mohammad Jafarpour Bitollah Eghbali

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27 - Dissimilar resistance spot welding of AISI 1075 eutectoid steel to AISI 201 stainless steel
Mehdi Safari Hossein Mostaan

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28 - Microstructure and Mechanical Properties of the Friction Welded Joint between X53CrMnNiN219 and X45CrSi93 Stainless Steel
khalil gheisari Mohammad Reza Abasi

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29 - Experimental Investigation on the dissimilar laser weld joints between Inconel 625 Superalloy and AISI 430 Ferritic Stainless Steel
Hossein Mostaan Mahdi Rafiei Mohammad Emadi

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30 - The Effect of Reverse Pulse Plating and Lanthanum Addition in Plating Bath on Corrosion Resistance of Austenitic Steel in Chlorine Solution
Leila Bakhtiari Abdolhamid Jafari Shahriyar Sharafi

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31 - An investigation on metallurgical and mechanical properties of vacuum brazed Ti-6Al-4V to 316L stainless steel using Zr-based filler metal
M.E Bajgholi R Soltani Tashi A.A Akbari Mousavi E Heshmat Dehkordi

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32 - Vacuum Brazing of Zirconium-Based Alloy and 321 Stainless Steel Using Titanium Based Filler Metal
M.E Bajgholi E Heshmat Dehkordi

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33 - The effect of activating fluxes on 316L stainless steel weld joint characteristic in TIG welding using the Taguchi method
E Ahmadi A.R Ebrahimi

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34 - Influence of Initial Microstructure on Hot Deformation Behavior of Duplex Stainless Steels
M Pouyamanesh B Eghbali Gh. R Ebrahimi M Saadati

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35 - The Milling of Metalsthrough Adaptive Neuro-FuzzyInference System (ANFIS) for non-touch Measuring of the Temperature to Reduce Coolant
Sara Kashisaz Zahra Basiri Paknafs Ahmad Riahi

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36 - Feasibility Investigation of Hydroforming of Dental Drill Body by FEM Simulation
Mohammad Sajjad Mahdieh Mohammad Reza Esteki

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37 - Study the Percentage of Carbon and Ferrite in Layers of Steel (SA-516) by Strip Cladding with E316L
Ahmad Afsari Dara Fazel Jafar Karimisharifabadi Vahid Mehrabi

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38 - Analytical, Experimental and Finite Element Investigation of Internal Pressure Effect in Hydroforming Process on Metallic Bellows Produced from Thin Wall Tube of Austenitic Stainless Steel Grade 316L
Mehdi Arabbeigi Mehran Moradi Boozarjomehr Ghasemi Majid Sattar

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39 - Micro Machining of AISI 440C Stainless Steel using Magnetic Field and Magnetic Abrasive Particles
Yahya Choopani Mohammad Reza Razfar

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40 - Machinability Improvement of 17-4PH Stainless Steel by Cryogenic Cooling
Salman Khani Mohammad Razfar Masoud Farahnakyan

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41 - None-platinum electrode catalysts and membranes for highly efficient and inexpensive H2 production in microbial electrolysis cells (MECs): A review
Abudukeremu Kadier Washington Logroño Pankaj Kumar Rai Mohd Sahaid Kalil Azah Mohamed Hassimi Abu Hasan Aidil Abdul Hamid

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42 - استفاده از تجزیه و تحلیل Gray Relational و تکنیک Taguchi در حل مشکلات چند هدفه برای چرخش عملکرد فولاد ضد زنگ آستنیتی
م. آزادی مقدم ف. کلاهان م. حسینی دوغ آبادی

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43 - The Investigation of Sensitization Effect on the Corrosion Behavior of SAF 2205 Duplex SS at Transpassive Region
خشایار مرشدبهبهانی پوریا نجفی سیار محمود پاکشیر

In this study, intergranular corrosion (IGC) behaviour of SAF 2205 duplex stainless steels (DSS) was investigated in the "2M H2SO4 + 1M HCl" solution at 30 ◦C using potentiodynamic polarization, DLEPR, X-ray diffraction, electrochemical impedance spectroscopy (EIS) and More

In this study, intergranular corrosion (IGC) behaviour of SAF 2205 duplex stainless steels (DSS) was investigated in the "2M H2SO4 + 1M HCl" solution at 30 ◦C using potentiodynamic polarization, DLEPR, X-ray diffraction, electrochemical impedance spectroscopy (EIS) and cyclic polarization tests. The EIS test results of the specimens, with various degrees of sensitization for 1 h and 5 h at 725 oC, shows three different responses in the trans passive region depending on the applied DC bias. Moreover, the results indicate that the charge transfer and polarization resistance (Rct and RP) of the sensitized DSS specimens decrease as a result of increasing the sensitization time which is in accordance with the optical and SEM micrographs from the corroded samples surfaces. Manuscript profile

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44 - Investigation of the Tempering Treatment on the Mechanical Propertiesof 13%Cr Super Martensitic Stainless Steel
Saeeid Jbarzare Iman Kheirollahi-Hoseinabadi S. M Sehri Rasol Ghasemi محمد Kuwaiti ابراهیم Shokraneh

The samples wear tempered at 520-720 °C for 3-10 h and air cooling to investigate the effect of tempering treatment on microstructural evolution and mechanical properties of13%Cr SuperMartensitic Stainless Steel. After heat treatment, hardness and tensile strength t More

The samples wear tempered at 520-720 °C for 3-10 h and air cooling to investigate the effect of tempering treatment on microstructural evolution and mechanical properties of13%Cr SuperMartensitic Stainless Steel. After heat treatment, hardness and tensile strength tests were performed for investigation of mechanical properties. Moreover, optical microscopy and scanning electron microscopy (SEM) were performed for investigation of microstructure observations. X-Ray diffraction (XRD) was carried out to measure of austenite retained in the samples. The results indicated that the optimization of mechanical properties were achieved by austenitizing treatment at 1050 °C for 1 h and water quenching and then tempering treatment at 600 °C for 3 h with air cooling.The results indicated that the optimization of mechanical properties were achieved by austenitizing treatment at 1050 °C for 1 h and water quenching and then tempering treatment at 600 °C for 3 h with air cooling.The results indicated that the optimization of mechanical properties were achieved by austenitizing treatment at 1050 °C for 1 h and water quenching and then tempering treatment at 600 °C for 3 h with air cooling. Manuscript profile

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45 - 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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In the present study, dissimilar joints welding of Incoloy 825 superalloy / 316L austenitic stainless steel by gas tungsten arc welding (GTAW) were investigated. In Inconel 625 weldment, dendretic microstructure was seen where cell-dendretic microstructure was found in More

In the present study, dissimilar joints welding of Incoloy 825 superalloy / 316L austenitic stainless steel by gas tungsten arc welding (GTAW) were investigated. In Inconel 625 weldment, dendretic microstructure was seen where cell-dendretic microstructure was found in base metal. There was no solidification crack in structure. In weldment/base metal interface, grain growth was seen in all of them except in 316L base metal/weldment 308L.Improved mechanical properties of weldment were attained by using of Inconel 625 welding wire. Manuscript profile

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47 - Theoretical and experimental study of Imidazolium Ionic Liquid Effect on the Corrosion Inhibition of 316-Stainless Steel, Using Electrochemical Test Methods and Quantum Mechanics Theories
Reza Safari ALI EHSANI Hamid Ebrahimi

In this study, the impact of )1-Buthyl-3-methyl imidazoloum hexa fluorophosphatesas( a new inhibitor on the corrosion of stainless steel 316L (SS) in HCl solution was investigated by means of potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). More

In this study, the impact of )1-Buthyl-3-methyl imidazoloum hexa fluorophosphatesas( a new inhibitor on the corrosion of stainless steel 316L (SS) in HCl solution was investigated by means of potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Also, the absorption of inhibitor onto the SS surface followed the Langmuir absorption model with the free energy of absorption ΔG0adsof -8.57 kJ mol-1. In addition, using density function theory (DFT) and atoms-in-molecule (AIM) theories, introduced by Richard Bader, which is a generalization of quantum theory to proper nano-size and molecular systems, the electronic organic-structure and local charge/energy transfer in the imidazole molecular system (as a organic-corrosion inhibitor element) are studied. In the same vein, the atomic electronic properties (such as electron density and its Laplacian), and the HOMO–LUMO gap (HLG) of this organic-molecular system are calculated. The results of the investigation show that proposed compound, as a commodious/economical -green inhibitor, has excellent inhibiting properties for SS corrosion in acidic solution. Furthermore, quantum mechanical results show that nitrogen atoms play domain role in intra-molecular charge and energy transfer (and thus electrochemical mechanism) in this inhibitor. Manuscript profile

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48 - ارزیابی خواص مکانیکی جوش های غیر مشابه فولاد زنگ نزن AISI 347 به فولاد کم آلیاژ ASTM A335
iman HAJIANNIA

In this study, the mechanical properties of dissimilar welding of austenitic stainless steel AISI 347 to low alloy steel ASTM A335 prepared by gas tungsten arc welding process using direct current electrode negative polarity have been investigated. For this purpose, two More

In this study, the mechanical properties of dissimilar welding of austenitic stainless steel AISI 347 to low alloy steel ASTM A335 prepared by gas tungsten arc welding process using direct current electrode negative polarity have been investigated. For this purpose, two filler metals including ER309L and ERNiCr-3 were used. In order to achieve suitable structure and excellent mechanical properties in the mentioned joints, controlling of the heat input and preheating were among the effective and controllable parameters. The microstructure of the base metals and weld metals, were evaluated using optical microscopy and scanning electron microscopy was used to analyze fracture surface. Microstructural evaluations showed that a two-phase structure consisting of dendritic and inter-dendritic regions with primary austenite solidification in ERNiCr-3 weld metal, and the primary skeleton-shaped ferrite with austenitic matrix in the 309L weld metal was observed. Also mechanical properties including the bend test, ultimate strength, impact resistance and hardness were investigated. All the specimen underwent ductile fracture in HAZ in the tension test. The maximum fracture energy related to the ERNiCr-3 the welded specimen. The maximum and minimum hardness corresponded to the ERNICr-3 and ER309L, respectively. Finally, it can be calculated that for the joints, between the austenitic stainless steel AISI 347 to low alloy steel A335, the ERNICr-3 filler provided the optimum qualities. Manuscript profile

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49 - Corrosion monitoring of sulfuric acid tank under anodic protection by electrochemical noise
احسان صائب نوری Mousa Mohammadian

In this research, the tanks made of carbon steel, similar to the practical conditions and in the form of pilot, was investigated. The tank containing 98% and 72% sulfuric acid was evaluated by potentiodynamic polarization test, open circuit potentials and potentiostatic More

In this research, the tanks made of carbon steel, similar to the practical conditions and in the form of pilot, was investigated. The tank containing 98% and 72% sulfuric acid was evaluated by potentiodynamic polarization test, open circuit potentials and potentiostatic test. Also, electrochemical noise measurement was carried out before, during and after the anodic protection, and the results were analyzed by statistical analysis at time intervals. . By analyzing the frequency range, PSD curves were obtained and it was observed that the values of slope and current and potential skewness could be used to determine the deviation or non-deviation of the normal distribution of electrochemical noise data. It was also found that by using spectral density curves, it is possible to eliminate the negative effects of additional noise and obtain complete information about the corrosion process. Noise resistance was obtained, but the noise resistance could be applied qualitatively to determine the corrosion rate. In this study, it was concluded that the electrochemical noise method is an efficient method for studying corrosion phenomena, such as crevice corrosion and anodic protection system during protection of tanks and heat exchangers in sulfuric acid. It was found that for a mild steel tank in Sulfuric Acid 98%, during protection, the slope value of the ROLL-OFF region was 2.4 and for dilute sulfuric acid 4.4, and it was found that in this area, the anodic protection was considerably high for carbon steel so protection in the sulfuric acid solution 72% is more suitable. Manuscript profile

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50 - The Influence of Sensitization Heat-treatment and Surface Finishing on the Properties of the SAF 2205 Duplex SS Passive Layer
Khashayar Morshed-Behbahani Mahmoud Pakshir Pooria Najafisayar Nika Zakerin

In this study, the properties of the passive layer, formed on the surface of SAF 2205 duplex stainless steels in sulphuric acid solution, were investigated. The degree of sensitization of the samples sensitized for 1 h and 5 h were evaluated using double loop electroche More

In this study, the properties of the passive layer, formed on the surface of SAF 2205 duplex stainless steels in sulphuric acid solution, were investigated. The degree of sensitization of the samples sensitized for 1 h and 5 h were evaluated using double loop electrochemical potentiokinetic reactivation technique (DLEPR). The results were in good agreement with those of sodium hydroxide etch tests for classification of structures of duplex stainless steels. In addition, the potentiodynamic polarization test was performed to determine the passive potential range of the solution-annealed samples sensitized samples. Cyclic polarization in anodic branch revealed the beneficial effects of having less surface roughness on the protective properties of the passive layer. Mott-Schottky method was used to evaluate the density of point defects at the surface. The results showed that those samples with finer surface roughness, less degree of sensitization and more polarization cycles have less defects (up to 44%) in their passive layers. So, the more degree of sensitization and surface roughness lead to the formation of less intact passive layer due to the formation of sigma phase and less number of microcells at the surface. Manuscript profile

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51 - Investigating the oxidation and electrical behavior of AISI 304 steel coated with cobalt for the application of solid oxide fuel cell
Mohammad Reza Ashorzadeh Morteza Zandrahimi Hadi Ebrahimifar

Oxidation resistance and electrical conductivity of stainless steels used as interconnects in solid oxide fuel cells can be improved by using a conductive and protective coating layer. In this study, AISI 304 austenitic stainless steel was coated in a cobalt powder base More

Oxidation resistance and electrical conductivity of stainless steels used as interconnects in solid oxide fuel cells can be improved by using a conductive and protective coating layer. In this study, AISI 304 austenitic stainless steel was coated in a cobalt powder base pack mixture. Isothermal oxidation test was used to investigate the oxidation resistance of coated and non-coated steel. Area specific resistance (ASR) was also measured as a function of oxidation time at 800 °C. Microstructure of coated and oxidized samples was studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD) device. The results showed that cobalt coated samples showed better oxidation resistance than non-coated samples. The results showed that increasing the temperature would increase the area specific resistance. The cobalt coating layer also converted to CoFe2O4, Co3O4 and CoCr2O4 spinels during the isothermal oxidation process. Cobalt spinels exhibited less ASR (27.4 mΩ cm2) compared to the uncoated sample (60.5 mΩ cm2). Manuscript profile

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52 - 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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53 - Investigation of the Intergranular Corrosion Behavior of UNS S42000 Martensitic Stainless Steels Using Potentiodynamic Electrochemical Impedance Spectroscopy
Khashayar Morshed-Behbahani Pooria Najafisayar Mahmoud Pakshir Nika Zakerin

10.30495/apme.2021.1908777.2012

In this research, UNS S42000 martensitic stainless steel (SS) samples were subjected to tempering heat treatment at constant temperature of 550 oC for different time duration, ranging between 0.5 and 24 h, so as to assess the intergranular corrosion (IGC) behavior of th More

In this research, UNS S42000 martensitic stainless steel (SS) samples were subjected to tempering heat treatment at constant temperature of 550 oC for different time duration, ranging between 0.5 and 24 h, so as to assess the intergranular corrosion (IGC) behavior of the alloy. The microstructural characteristics and electrochemical properties of the alloys were evaluated using scanning electron microscopy (SEM) and anodic polarization method, respectively. The localized attack of the samples was investigated by potentiodynamic electrochemical impedance spectroscopy (PD-EIS) in the transpassive potential region. The results indicated that tempering up to 2 h would be followed by severe intergranular attack at martensite lath interfaces; however, the effect of tempering on corrosion performance of the alloys would be suppressed at prolonged tempering due to desensitization. Moreover, the PD-EIS results revealed that the charge transfer resistance (Rct) values of specimens at 1.10 V can be employed as a primary criterion in order to assess the localized attack of the martensitic SS. In this regard, the lower the Rct value at this DC bias potential, the lower the corrosion resistance to the IGC. These results were in good agreement with the SEM morphologies from the surfaces of corroded samples, indicating uniform corrosion, severe attack and desensitization for samples experiencing no-tempering, short tempering time and prolonged tempering, respectively. Manuscript profile

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54 - بررسی تاثیر عملیات حرارتی بر خواص ریزساختاری ورق سه لایه آلومینیوم منیزیم- آلومینیوم خالص- فولاد زنگ نزن
داوود میراحمدی ابوالفضل غلام زاده

فلزات روکشی، مواد فلزی دو یا چند لایه ای می باشند. امروزه فلزات روکشی به طور گسترده در صنعت کاربرد دارند. این ورق ها راه‌حل های موثری در عملکرد یا صرفه جویی هزینه و یا هر دو ایجاد می کنند. عملکرد فلزات روکشی بنا به کاربردهایشان به کاربردهای ساختمانی، تنظیمات انبساط حرار More

فلزات روکشی، مواد فلزی دو یا چند لایه ای می باشند. امروزه فلزات روکشی به طور گسترده در صنعت کاربرد دارند. این ورق ها راه‌حل های موثری در عملکرد یا صرفه جویی هزینه و یا هر دو ایجاد می کنند. عملکرد فلزات روکشی بنا به کاربردهایشان به کاربردهای ساختمانی، تنظیمات انبساط حرارتی، کنترل های ترمومکانیکی (ترموستات)، الکتریکی، مغناطیسی، مقاوم به خوردگی، اتصال دهی و تزیینی تقسیم می شود. در هر گروه عملکردی، ممکن است چندین سیستم فلز روکشی حضور داشته باشد.در پژوهش حاضر با استفاده از فرآیند اتصال نوردی، ورق سه لایه آلومینیوم منیزیم- آلومینیوم خالص- فولاد زنگ نزن تولید شد. استحکام پیوند در حالت های مختلف با استفاده از آزمون کشش بررسی شد و با تحلیل تصاویر میکروسکوپ نوری استریو و میکروسکوپ الکترونی روبشی(FE-SEM)، کیفیت پیوند مورد ارزیابی قرار گرفت. از سطح مقطع پیوند در شرایط مختلف نمونه های نورد شده و آنیل شده عکس برداری گردید. به منظور تعیین بهترین شرایط تولید ورق چند لایه، اثر پارامتر های فرآیند اتصال نوردی مورد بررسی قرار گرفت. تغییرات خواص مکانیکی در حالت های مختلف توسط آزمون کشش طبق استاندارد مجازASTM E8M انجام گردید. بررسی ها نشان داد که با آنیل نمونه ها در دماهای بالای 375 درجه سانتیگراد برای آلومینیوم، استحکام پیوند افزایش قابل توجهی نسبت به نمونه های نورد شده داشته است. Manuscript profile

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55 - بهینه سازی پارامترهای جوشکاری قوس تنگستن گاز پالسی در اتصال غیرمشابه مونل۴۰۰ و فولاد زنگ نزن آستنیتیL۳۱۶
علی خلیلی مسعود کثیری عسگرانی مرتضی شمعانیان

در این مقاله بهینه سازی پارامترهای جوشکاری قوس تنگستن-گاز پالسی از جمله جریان پالس، جریان زمینه، فرکانس پالس و کسر زمان روشن بودن پالس در اتصال غیرمشابه فولاد زنگ نزن آستنیتی AISI 316L و سوپر آلیاژ پایه نیکل مونل۴۰۰ با استفاده از فلز پر کننده ERNiCr3، ارزیابی شد. جهت بد More

در این مقاله بهینه سازی پارامترهای جوشکاری قوس تنگستن-گاز پالسی از جمله جریان پالس، جریان زمینه، فرکانس پالس و کسر زمان روشن بودن پالس در اتصال غیرمشابه فولاد زنگ نزن آستنیتی AISI 316L و سوپر آلیاژ پایه نیکل مونل۴۰۰ با استفاده از فلز پر کننده ERNiCr3، ارزیابی شد. جهت بدست آوردن شرایط بهینه از روش طراحی آزمایش تاگوچی، آرایه L9، استفاده گردید. برروی نمونه های جوشکاری شده آزمون های خواص مکانیکی انجام و سپس آنالیز واریانس انجام گرفت. با پیش بینی شرایط بهینه، نمونه پیشنهادی مورد آزمایش واقع گردید و نتایج آزمایشهای آن با نتایج حاصل از آزمایش بر روی نمونه بهینه طراحی شده مطابقت نشان داد. پارامترهای بهینه قوس تنگستن گاز پالسی در این اتصال، جریان پالس ۱۴۰ آمپر، جریان زمینه ۶۰ آمپر، فرکانس پالس ۳ هرتز و کسر زمان روشن بودن پالس ۵۰ درصد می باشد. نمونه ی بهینه طراحی شده با نمونه پیشنهادی تاگوچی در حدود۷/۹۸ درصد همخوانی دارند. جریان پالس با درصد۴/۲۳و فرکانس پالس با درصد ۲/۲۸به عنوان تاثیرگذارترین پارامترها شناسایی شدند. خواص مکانیکی، شامل آزمایش های خمش، کششی، سختی سنجی بررسی شد. در طی اعمال آزمایش کشش بر روی نمونه ها،شکست از سمت فلز پایه مونل ۴۰۰ اتفاق افتاد که از نوع شکست نرم می باشد. بنابراین استحکام فلز جوش تایید کننده آزمونهای کشش و خمش می باشد. Manuscript profile

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56 - Investigating on process variables effect of AISI 304 stainless steel machining using minimum quantity lubricant on cutting force
Mohammad Ali Safataj Sayed Ehsan Mirmohammadsadeghi Reza Abedinzadeh

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