摘要
采用光纤激光器焊接了0.1C-5Mn钢,研究了不同热输入对接头的组织、硬度、拉伸和成形性能的影响。结果表明,不同热输入的接头焊缝区均为马氏体组织,热影响区由细小马氏体/贝氏体混合组织、奥氏体和铁素体组成;焊缝区的平均硬度均比母材的高。当热输入为100 J·mm^(-1)时,接头的亚临界热影响区有轻微软化趋势。不同热输入的接头拉伸试样均断裂于母材区,断口为韧性断裂,且接头抗拉强度均比母材的大;接头杯突裂纹在焊缝区启裂并垂直于焊缝向母材区扩展;平行于轧向焊接的拼焊板成形性能优于垂直于轧向的。
The 0. 1C-5Mn steels are welded by a fiber laser, and the effect of heat input on the microstructure, micro-hardness, tensile properties and formability of steel joints is investigated. The results show that the fusion zones （FZs） of joints under different heat inputs are always full of martensite structures, and in contrast the heat- affected zones （HAZs） are composed of fine martensite/bainite mixed structures, austenite and ferrite. The average micro-hardness of the FZs is always higher than that of the base materials. A slightly softened zone occurs in the subcritical HAZ when the heat input is 100 J · mm^-1. All the tensile samples of welded joints fracture at the base materials and the fractures belong to the ductile ones. The ultimate tensile strength of joints is higher than that of base materials. The Erichsen cracks of welded joints initiate in the FZ and extend perpendicular to the weld towards the base material zone. The forming performance of tailor-welded blank parallel to the rolling direction is superior to that of the perpendicular.
作者
曹洋
赵琳
彭云
马成勇
田志凌
钟敏霖
Cao Yang;Zhao Lin;Peng Yun;Ma Chengyong;Tian Zhiling;Zhong Minlin(School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China;Central Iron and Steel Research Institute,Beijing 100081,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2018年第11期83-91,共9页
Chinese Journal of Lasers
基金
国家科技部国际合作专项(2015DFA51460)
关键词
激光技术
激光焊接
中锰钢
显微组织
力学性能
成形性能
laser technique
laser welding
medium Mn steel
microstructure
mechanical properties
formability
