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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure and Softening of Laser-Welded 960 MPa Grade High Strength Steel Joints
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Microstructure and Softening of Laser-Welded 960 MPa Grade High Strength Steel Joints

机译：激光焊接960 MPa级高强度钢接头的组织和软化

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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 μm, and the grain size in the fine grain zone is less than 5 μm. 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.
机译：研究了960 MPa级高强度钢激光焊接接头的组织演变及其对热影响区（HAZ）软化性能的影响。结果表明，热影响区和熔合区（FZ）的显微组织由板条马氏体和贝氏体铁素体组成。混合晶粒区的显微组织呈现条状特征，小块状马氏体沿晶界分布。熔合线附近的晶粒尺寸为约25μm，并且细晶粒区域中的晶粒尺寸小于5μm。 HAZ和FZ的显微硬度低于贱金属。由于马氏体回火与轧制组织的恢复和再结晶的相互作用，软区位于回火区和混晶区之间的过渡区域。软区的显微硬度为310 HV，与基础材料相比下降18％。焊接热输入对软区的宽度和显微硬度有显着影响。焊接接头的拉伸性能与热影响区的软化行为密切相关。

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