TY - JOUR T1 - Investigation of structural changes in resistance spot welding of advanced high strength steel DP590 TT - بررسی تحولات ساختاری در جوشکاری مقاومتی نقطه‌ای فولاد پیشرفته استحکام بالای DP590 JF - JWSTI JO - JWSTI VL - 6 IS - 1 UR - http://jwsti.iut.ac.ir/article-1-301-en.html Y1 - 2020 SP - 57 EP - 65 KW - Advanced high strength steel DP590 KW - Spot resistance welding KW - Microstructure KW - Microhardness KW - Simulation N2 - The structural and hardness developed in advanced high-strength steel DP590 have been investigated with the help of optical microscopy and scanning electron microscopy on resistance spot welded specimens. The hardness diagram of the weld sections was prepared by microhardness test and the temperature peak and heat distribution were simulated by menas of the Abaqus software. The results show that according to the temperature generated in each region of the weld nugget, the HAZ and base metals have different microstructures, and these difference affects the hardness of the regions. The presence of tempered martensite islands with a fraction of 44% in ferrite matrix in base metal, mainly martensitic structure in the nugget, and martensitic structure along with scattered areas of ferrite in the HAZ was observed. The results of the microhardness tests showed difference in hardness values of the regions, and also it was observed that the hardness values increased in the HAZ and weld zone. The hardness values measured in the nugget, base metal, and HAZ were around 400, 200, and 450 HV which were in accordance with the observed structures M3 ER -