حسین مستعان
عضو هیأت علمی دانشگاه اراک
[ 1 ] - مطالعه و بررسی تشکیل نانوکامپوزیت زمینه بین فلزی NbAl3 با ذرات تقویت کننده Al2O3: بررسی ریزساختاری، ترمودینامیکی و آنالیز حرارتی
هدف از انجام این پژوهش، تولید نانوکامپوزیتی با زمینه NbAl3 توسط روش آلیاژسازی مکانیکی به منظور افزایش چقرمگی و استحکام دما بالای آن می‌باشد. به این منظور مقدار 49 درصد وزنی پودر آلومینیوم به همراه 51 درصد وزنی اکسید نیوبیوم مخلوط و آلیاژسازی مکانیکی گردید. تغییرات فازی ذرات پودر و همچنین ریزساختار و مورفولوژی ذرات پودر در زمان های مختلف آسیاب کاری توسط آزمون های پراش پرتو ایکس (XRD)، میکروسکوپ ...
[ 2 ] - The Interface Structure in Dissimilar Welding of AISI 4130 to AISI 316L Steels Using ERNiCr-3 Filler Metal
In this research the interface structure of dissimilar joint between AISI 4130 and AISI316L steels produced by GTAW process was evaluated. ERNiCr-3 was used as a filler metal for this joint. After welding the microstructure of different areas including weld metals, heat affected zones and interfaces were studied by optical microscope (OM), scanning electron microscope (SEM) and energy dispersiv...
[ 3 ] - A novel method for laser forming of two-step bending of a dome shaped part
In recent decades, one of the challenges in sheet metal forming was production of two-step bending surfaces without mechanical tools and external force or by a combination of heat source and mechanical tools. Forming with a heat source such as laser beam has the potential for forming arbitrary 3D shapes such as two-step bending surfaces. In this paper a novel method for laser forming of complic...
[ 4 ] - Dissimilar resistance spot welding of AISI 1075 eutectoid steel to AISI 201 stainless steel
In this paper, dissimilar resistance spot welding of AISI 1075 eutectoid steel to AISI 201 stainless steel is investigated experimentally. For this purpose, the experiments are designed using response surface methodology and based on four-factor, five-level central composite design. The effects of process parameters such as welding current, welding time, cooling time and electrode force are inv...
[ 5 ] - The effect of mechanical activation on the kinetic and formation mechanism of a niobium aluminide based nanocomposite
In this paper the feasibility of NbAl3/Al2O3 nanocomposite formation through mechanochemical reaction between Al and Nb2O5 and the effect of mechanical activation on the kinetic and reaction mechanism were investigated. Structural and phase evolution during mechanical alloying were studied by employing transmission electron microscopy (TEM)...
[ 6 ] - MICROSTRUCTURAL STUDIES ON LASER WELDING OF INCONEL 718 TO 2304 DUPLEX STAINLESS STEEL WITH A FOCUS ON OPTIMAZING PROCESS PARAMETERS AND ACHIEVING THE MAXIMUM FRACTURE STRENGTH
In this research, microstructure and mechanical properties of laser welded joints between 2304 duplex stainless steel and Inconel 718 nickel-based super alloy were investigated. Microstructural evolution in the various areas of welded joints and also the effect of welding parameters on the mechanical properties of dissimilar joints were studied. Response surface methodology based on the central...
[ 7 ] - Effect of bonding time on microstructure and mechanical properties during TLP bonding of nickel-base superalloys Hastelloy C276 and Stainless Steel AISI316
Joining of Hastelloy C276 nickel-base superalloy to AISI316 Stainless Steel using BNi-2 interlayer performed by transient liquid phase process (TLP) at 1150°C for 5 and 30 minutes. Bonding microstructure was studied using an Optical microscope and a scanning electron microscope (SEM). Vickers hardness test and shear strength test have been used to evaluate the mechanical properties. Microstruct...
[ 8 ] - Effect of bonding time on microstructure and mechanical properties during TLP bonding of nickel-base superalloys Hastelloy C276 and Stainless Steel AISI316
Joining of Hastelloy C276 nickel-base superalloy to AISI316 Stainless Steel using BNi-2 interlayer performed by transient liquid phase process (TLP) at 1150°C for 5 and 30 minutes. Bonding microstructure was studied using an Optical microscope and a scanning electron microscope (SEM). Vickers hardness test and shear strength test have been used to evaluate the mechanical properties. Microstruct...
نویسندگان همکار