Microstructures and Toughness in Simulated Coarse Grain Heat-affected Zones of Copper-bearing Steel
Microstructures and toughness of simulated coarse grain heat-affected zone of hot continuously rolled copper-bearing steel were investigated using physical simulation. The results showed that brittlement is easy to happen in the region of CGHAZ with slower thermal cycles (t8/5≥45s). Granular bainite transformed from austenite led to brittlement. The dimensions of granular martensite and austenite (M-A) constituents are main factors influencing the impact toughness. There is no visible effect on the toughness when the dimensions of M-A constituents are less than 1 m. However, the toughness decreases greatly once the dimensions exceed 1 m. Therefore, decreasing the dimensions of M-A constituents by controlling weld heat input will do good to improve the impact toughness of copper-bearing steel.
copper-bearing steel coarse grain heat-affected zone granular bainite M-A constituents
LIU Wenyan WANG Lai LIU Jibin LI Pinghe MIAO Kai HAN Rongdong
School of Materials Science and Engineering, Dalian Uniersity of Technology, Dalian 116024, China;Re School of Materials Science and Engineering, Dalian Uniersity of Technology, Dalian 116024, China Research and Development Center, Wuhan Iron & Steel (Group) Corp., Wuhan 430080, China
国际会议
郑州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）