Microstructure and properties of 1100 MPa grade low-carbon hot-rolled steel by laser welding  

作　　者：Chen Dong Ai-min Zhao Xi-tao Wang Qi-hang Pang Hui-bin Wu 

机构地区：[1]Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083, China [2]Engineering Research Institute, University of Scienceand Technology Beijing, Beijing 100083, China

出　　处：《Journal of Iron and Steel Research International》2018年第2期228-234,共7页

摘　　要：The microstructure and mechanical properties of the butt joint of 1100 MPa grade hot-rolled low-carbon steel by laser welding were investigated by scanning electron microscopy, micro-hardness and tensile tests. The yield strength and tensile strength of the laser welded joint reached 100.2 and 99.5% of the base material （BM）, respectively. However, the elongation of the welded joint only reached about 60% of BM. The lowest and highest hardness areas both existed in the incomplete recrystallization zone. The width of the softened area of the welded joint is about 240-260 pro. The element distribution has no obvious change for C, Cr, Si, Mn, Ti, etc.The microstructure and mechanical properties of the butt joint of 1100 MPa grade hot-rolled low-carbon steel by laser welding were investigated by scanning electron microscopy, micro-hardness and tensile tests. The yield strength and tensile strength of the laser welded joint reached 100.2 and 99.5% of the base material （BM）, respectively. However, the elongation of the welded joint only reached about 60% of BM. The lowest and highest hardness areas both existed in the incomplete recrystallization zone. The width of the softened area of the welded joint is about 240-260 pro. The element distribution has no obvious change for C, Cr, Si, Mn, Ti, etc.

关 键 词：Hot-rolled steel Laser welding MICROSTRUCTURE Mechanical property Element distribution 

分 类 号：TG456.7[金属学及工艺—焊接] TG146.21[一般工业技术—材料科学与工程]