摘要
采用SEM观察、硬度测试、拉伸试验等手段,研究了焊后热处理对DP980钢激光焊接接头组织与性能的影响。结果表明,DP980钢激光焊接接头中各区域马氏体相的比例存在明显差异:相对于母材,熔合区的马氏体比例更高,而热影响区马氏体比例明显下降,形成了明显的软区,降低了接头的力学性能。焊后热处理可以改善接头各区域的组织均匀性,有效消除软区,从而提高接头的硬度和强度,但接头的塑韧性降低。
The effect of post weld heat treatment on the microstructure and properties of laser welded joint of DP980 steel was studied by means of SEM observation,hardness test and tensile test.The results show that the proportion of martensite phase in each region of the DP980 steel laser welded joint is significantly different.Compared with that of the base metal,the proportion of martensite in the fusion zone is higher,while the proportion of martensite in the heat-affected zone is significantly decreased,resulted in an obvious soft zone and reducing the mechanical properties of the joint.The post weld heat treatment can improve the structure uniformity of each area of the joint,effectively eliminate the soft zone,thus improving the hardness and strength of the joint,but it reduces the plastic toughness of the joint.
作者
赖春明
李琴
周家林
谭海林
莫金竹
聂慧
LAI Chunming;LI Qin;ZHOU Jialin;TAN Hailin;MO Jinzhu;NIE Hui(School of Mechanical and Electrical Engineering,Hunan Chemical Vocational Technology College,Zhuzhou 412011,China;Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,China;Zhuzhou Tianyi Welding&Cutting Automatic Equipment Co.,Ltd.,Zhuzhou 412000,China)
出处
《热加工工艺》
北大核心
2023年第23期67-71,共5页
Hot Working Technology
基金
湖南省教育厅资助科研项目优秀青年项目(23B0966)
湖南省自然科学基金科教联合基金(2022JJ60042)。
关键词
DP980钢
激光焊接
焊后热处理
显微组织
力学性能
DP980 dual-phase steel
laser welding
post weld heat treatment
microstructure
mechanical property
