Microstructure and properties of 1100 MPa grade low-carbon hot-rolled steel by laser welding
Chen Dong1,2 �� Ai-min Zhao1,2 �� Xi-tao Wang 1 �� Qi-hang Pang 2 �� Hui-bin Wu1,2
1 Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China 2 Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083, China
Microstructure and properties of 1100 MPa grade low-carbon hot-rolled steel by laser welding
Chen Dong1,2 �� Ai-min Zhao1,2 �� Xi-tao Wang 1 �� Qi-hang Pang 2 �� Hui-bin Wu1,2
1 Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China 2 Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083, China
ժҪ 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�C260 ��m. The element distribution has no obvious change for C, Cr, Si, Mn, Ti, etc.
Abstract��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�C260 ��m. The element distribution has no obvious change for C, Cr, Si, Mn, Ti, etc.
Chen Dong, �� Ai-min Zhao, �� Xi-tao Wang �� Qi-hang Pang �� Hui-bin Wu,. Microstructure and properties of 1100 MPa grade low-carbon hot-rolled steel by laser welding[J].Journal of Iron and Steel Research International, 2018, 25(2): 228-234.
Chen Dong, �� Ai-min Zhao, �� Xi-tao Wang �� Qi-hang Pang �� Hui-bin Wu,. Microstructure and properties of 1100 MPa grade low-carbon hot-rolled steel by laser welding. , 2018, 25(2): 228-234.
2018, Vol. 25 
