In-depth understanding in the effect of hydrogen on microstructural evolution, mechanical properties and fracture micro-mechanisms of advanced high-strength steels welded joints

被引:29
作者
Xue, Junliang [1 ]
Guo, Wei [1 ,2 ]
Xia, Mingsheng [3 ]
Zhang, Yongxin [1 ]
Tan, Caiwang [4 ]
Shi, Jiaxin [1 ]
Li, Xiang [5 ]
Zhu, Ying [1 ]
Zhang, Hongqiang [1 ,2 ]
机构
[1] Beihang Univ, Sch Mech Engn & Automat, Beijing 100191, Peoples R China
[2] Beihang Univ, Jiangxi Res Inst, Nanchang 330096, Peoples R China
[3] TANGSTEEL Co, R&D Ctr, HBIS Grp, Tangshan 063016, Peoples R China
[4] Harbin Inst Technol Weihai, Shandong Prov Key Lab Special Welding Technol, Weihai 264209, Peoples R China
[5] Tsinghua Univ, Beijing Electron Microscope Ctr, Beijing 100084, Peoples R China
关键词
QP980 laser welded joint; Hydrogen embrittlement; Transgranular propagation; Intergranular propagation; ENHANCED LOCALIZED PLASTICITY; INDUCED CRACKING; EMBRITTLEMENT SUSCEPTIBILITY; FAILURE; MORPHOLOGY; AUSTENITE;
D O I
10.1016/j.corsci.2024.112112
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The hydrogen embrittlement (HE) mechanism of QP980 steels laser welded joints with complex microstructures is unclear. The joint with hydrogen pre-charging fractured at the inter-critical heat affected zone (ICHAZ) in slow strain rate tensile test, and the relative loss of elongation amounted to 84.8 %. Hydrogen-induced microcracks mainly initiated inside martensite (similar to 60 %). Hydrogen-induced crack propagation paths of the joint were transgranular propagation of martensite and intergranular propagation of ferrite/martensite interface. The HE mechanism of the joint was the combination of the effects in hydrogen-enhanced localized plasticity (HELP) and hydrogen-enhanced decohesion (HEDE).
引用
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页数:14
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