چکیده مقاله
Effect of in situ Post Weld Heat Treatment PWHT parameters on microstructure and mechanical properties ofresistance spot welded DP980 steel was investigated Samples were welded at 8 5 kA and 4 levels of PWHT current 3 5 to 5 kA, with 0 5 kA steps at a constant PWHT time 80cycles and 3 levels of PWHT time 10, 50 and 99 cycles ata constant PWHT current 4 kA Results showed that whileno noticeable martensite tempering occurred at 3 5 kA PWHTcurrent, PWHT at 4 kA resulted in a fully temperedmicrostructure consisting mostly of a ferritic matrix withdispersed carbide particles However, higher PWHT currentsincreased heat input and consequently temperature at thewelded region up to the austenite formation temperature,resulting in formation of new martensite phase upon cooling Tensile test results showed that at PWHT current of 4 kA, thejoint has the highest peak load load bearing capacity andfracture energy 13 3 kN and 15 1 J, respectively For PWHTtime, both peak load and fracture energy increased withPWHT time up to 14 3 kN and 15 7 J, respectively andmicrostructure consisted mainly of ferrite and carbideparticles To summarize, PWHT enhanced mechanicalproperties and reduced martensite phase in microstructure However, PWHT did not change the fracture mode andinterfacial fracture occurred in the as welded and all PWHTsamples
کلیدواژهها
نویسندگان
Bahman Valizadeh
Master's student in materials engineering, Shahid Madani University of Azarbaijan Tabriz Iran
Milad Zare
Bachelor of Chemical Engineering Islamic Azad University, Maroodasht Branch
شیوه ارجاع
Valizadeh, Bahman and Zare, Milad,1401,Heat treatment after welding of DP980 steel: effect of heat treatment parameters onmicrostructure and mechanical properties of resistance spot welding,The 19th National Conference and the 8th International Conference on Construction and Production Engineering of Iran,Mashhad
ارائهشده در
مجموعه مقالات نوزدهمین همایش ملی و هشتمین کنفرانس بین المللی مهندسی ساخت و تولید ایران18 اسفند 1401 · مشهد