Microstructure and Softening of Laser-Welded 960 MPa Grade High Strength Steel Joints

被引：19
作者：
Meng, Wei [1 ]
Li, Zhuguo [1 ]
Huang, Jian [1 ]
Wu, Yixiong [1 ,2 ]
Katayama, Seiji [3 ]
机构：
[1] Shanghai Jiao Tong Univ, Shanghai Key Lab Mat Laser Proc & Modificat, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China
[3] Osaka Univ, Joining & Welding Res Inst JWRI, Ibaraki, Osaka 5670047, Japan
来源：
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2014年 / 23卷 / 02期
基金：
中国国家自然科学基金;
关键词：
HAZ; laser welding; microstructure; softening; HEAT-AFFECTED ZONE; DUAL-PHASE STEEL; GRAIN-SIZE; FORMABILITY; TOUGHNESS; PROGRESS; METAL; HAZ;
D O I：
10.1007/s11665-013-0795-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructural evolution of laser-welded 960 MPa grade high strength steel joints and its effect on softening behavior of heat affected zone (HAZ) were investigated in this paper. The results show that microstructure of HAZ and fusion zone (FZ) is composed of lath martensite and bainitic ferrite. The microstructure of mixed grained zone presents strip-like characteristics and small block martensite distributes along the grain boundary. The grain size near the fusion line is about 25 mu m, and the grain size in the fine grain zone is less than 5 mu m. Microhardness of HAZ and FZ is lower than base metal. The soft zone locates in transitional region between tempering zone and mixed grained zone due to the interaction of the martensite tempering and the recovery and recrystallization of the rolled microstructure. Microhardness of soft zone is 310 HV and drops 18% compared to base material. Welding heat input has a remarkable effect on the width of soft zone and microhardness. The tensile properties of weld joints are closely related to the softening behavior of HAZ.
引用
收藏
页码：538 / 544
页数：7
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