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  1 - Effect of heat treatment on mechanical properties, solidification structure and segregation of Inconel 625 alloy in additive manufacturing process by DLMD method
  mohammad gavahian jahromi Reza Shoja Razavi hamed Naderi fareed kermani
  Direct metal laser deposition is using for rebuilding and manufacturing parts. In this method, it is imperative to check the melting and solidification conditions. In this research the effect of the primary process parameters on the microstructure has been investigated. More

  Direct metal laser deposition is using for rebuilding and manufacturing parts. In this method, it is imperative to check the melting and solidification conditions. In this research the effect of the primary process parameters on the microstructure has been investigated. Distance of the dendritic arms, and the segregation of alloy elements, to determine the mechanical properties of IN625. According to the examination of the scanning electron microscope image, by moving from the interface to the top of the cladding. The solidification structure changed from columnar dendritic to coaxial dendritic with decreased G/R ratio. From the interface to the sample’s surface, the cooling rate increased, and the spread between the dendritic arms decreased. By moving away from the interface, the distance of the dendritic arm increases. By changing the laser power from 250 to 450 watts, the G/R ratio decreased from 1252.08 ℃/〖mm〗^2 to 970.34℃/〖mm〗^2 . It was conducting heat treatment led to the uniformity of alloy elements in the background phase. Also, with heat treatment, tensile strength, and elongation increased and yield strength decreased. Manuscript profile
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  2 - Characterization and investigation of biocompatibility of bioactive glass 60 mol%SiO2-36 mol%CaO-4 mol%P2O5-5 mol%SrO containing zinc
  Amirhossein Moghanian Noushin Nankali Morteza Saghafiyazdi
  In this research, bioactive glasses 60mol%SiO2-36mol%CaO-4mol%P2O5-5mol%SrO containing 0, 5, and 8 mol% zinc were synthesized by sol-gel method, and the effect of adding ZnO microstructure, in vitro bioactivity and biocompatibility was investigated. To investigate the i More

  In this research, bioactive glasses 60mol%SiO2-36mol%CaO-4mol%P2O5-5mol%SrO containing 0, 5, and 8 mol% zinc were synthesized by sol-gel method, and the effect of adding ZnO microstructure, in vitro bioactivity and biocompatibility was investigated. To investigate the in vitro bioactivity, glass powders were placed in the simulated body solution (SBF) for 14 days, and before and after the mentioned periods, the changes and process of hydroxyapatite (HA) phase formation on BGs surfaces, using characterization methods. Fourier transform infrared (FTIR), checking the release rate of different ions by inductively coupled plasma spectroscopy (ICP_AES), pH changes, and microstructure studies using a scanning electron microscope (SEM) were investigated. In the infrared Fourier transform spectroscopic analysis of the surface of the synthesized bioactive glasses after immersion in SBF solution, phosphate and carbonate bands were detected, indicating the synthesized glasses' bioactivity. Also, the scanning electron microscope images showed that the microstructure of HA created was spherical. Finally, among all the bioactive glasses synthesized in this research, S5Z5 bioactive glass was introduced as a new multi-functional biological bio-material in bone tissue engineering due to its osteogenic, biocompatibility, and bioactivity in vitro properties. Manuscript profile
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  3 - Production and characterization of WC-10Co-4Cr-xGr composite coating produced by thermal spraying method
  mohammad razazi boroujeni Ayat Muayad Lafta Al Nidawi Farhad Azimifar
  One of the most widely used methods to Improving the surface resistance of industrial parts is applying composite coatings such as WC-10Co-4Cr. But this coating, despite its excellent corrosion resistance, does not have a good tribological behavior compared to other tun More

  One of the most widely used methods to Improving the surface resistance of industrial parts is applying composite coatings such as WC-10Co-4Cr. But this coating, despite its excellent corrosion resistance, does not have a good tribological behavior compared to other tungsten carbide base coatings. For this purpose, in this research, by adding graphite in two amounts of 7% and 14% by weight to WC-10C-4Cr powder and applying coatings by thermal spraying on the steel substrate, their tribological behavior was compared. Investigations were carried out with the help of SEM images, XRD test, roughness measurement and hardness measurement. Pin-on-disk test was also used to evaluate the wear resistance behavior of coatings and substrate. The results showed that despite the relative decrease in hardness and increase in the roughness of the tungsten carbide base coating, graphite leads to a significant improvement in the tribological behavior of the substrate and the tungsten carbide coating. Among the coatings, coating with 7% graphite It had the best wear resistance due to the combination of suitable hardness, low porosity and low friction coefficient. The wear mechanism of the coatings was also investigated with the help of SEM images and EDS analysis. It was found that the dominant mechanism of coatings containing graphite, dellamination and WC-10Co-4Cr coating was adhesive. The most important reason for increasing the tribological properties of coatings in the presence of graphite was the formation of a protective layer of these reinforcing particles in the wear path and around the pin. Manuscript profile
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  4 - Effect of Graphite on the Mechanical Properties and Tribological Behavior of Aluminum Matrix ‎Nanocomposite
  Elham Bakhshizade Ali Shokuhfar Ashkan Zolriasatein Mehdi Khodaei
  This study aims to compare the effect of graphite content (0–5 wt.%) on the mechanical and ‎tribological properties of aluminum matrix nanocomposites. The bulk samples were prepared ‎by the mechanical milling/hot pressing (temperature 420 °C/ pressure More

  This study aims to compare the effect of graphite content (0–5 wt.%) on the mechanical and ‎tribological properties of aluminum matrix nanocomposites. The bulk samples were prepared ‎by the mechanical milling/hot pressing (temperature 420 °C/ pressure 400 MPa/ time 1h) ‎process. According to the obtained results in this work, the addition of graphite to an ‎aluminum matrix significantly improves the wear properties of aluminum (wear rate and ‎coefficient of friction). The best wear performance was obtained with the sample containing ‎‎5wt.% graphite, which showed a 62% reduction in the wear rate and a 2.5-fold reduction in ‎coefficient of friction compared to the unreinforced aluminum sample. Although increasing ‎the amount of graphite in the range of 0-5 wt.% leads to a continuous improvement in the ‎wear behavior of the composite material, it results in a simultaneous deterioration of the ‎mechanical properties (hardness and compressive strength) and the density of the Aluminum- ‎Graphite composites.‎ Manuscript profile