Effect of water cooling assistance on fatigue behavior of laser welded QP980 steel

被引：3
作者：
Zhang, Chunguo [1 ]
Tian, Jiazhuang [1 ]
Yang, Shanglu [2 ,3 ]
Mu, Shengyong [4 ]
机构：
[1] Changan Univ, Key Lab Rd Construction Technol & Equipment, MOE, Xian 710064, Peoples R China
[2] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China
[3] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, Shanghai 201800, Peoples R China
[4] Xian Special Equipment Inspect Inst, Xian 710065, Peoples R China
来源：
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2024年 / 28卷
基金：
中国国家自然科学基金;
关键词：
QP980; steel; Laser welding; Water cooling assistance; Fatigue; MECHANICAL-PROPERTIES; DEFORMATION-BEHAVIOR; MICROSTRUCTURE; CYCLE; EVOLUTION; TENSILE; HAZ;
D O I：
10.1016/j.jmrt.2023.12.138
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Quenching and partitioning 980 (QP980) steel has been applied to new energy vehicles, but even laser welding joints show poor fatigue performance. In this study, water-cooling assistance is applied to improve fatigue resistance of welded joints. Hardness, tensile and fatigue tests are performed together with microstructure observation (scanning electron microscope, transmission electron microscope and electron back scattered diffraction). It is found that tempering martensite showing low hardness and small average grain boundary angles are responsible for poor fatigue performance. Results show that water-cooling assistance significantly improves welding softening and fatigue crack growth behavior of welded joints.
引用
收藏
页码：2060 / 2070
页数：11
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