In-situ observation of microcrack initiation and damage nucleation modes on the HAZ of laser-welded DP1180 joint

doi:10.1016/j.jmst.2023.01.001

J. Mater. Sci. Technol. ›› 2023, Vol. 148: 138-149.DOI: 10.1016/j.jmst.2023.01.001

• Research article • Previous Articles Next Articles

In-situ observation of microcrack initiation and damage nucleation modes on the HAZ of laser-welded DP1180 joint

Junliang Xue^a, Wei Guo^a, Jin Yang^b, Mingsheng Xia^c, Guang Zhao^c, Caiwang Tan^d, Zhandong Wan^e, Jiaxuan Chi^f, Hongqiang Zhang^a,*

^aSchool of Mechanical Engineering and Automation, Beihang University, Beijing, 100191, China;
^bSchool of Materials Engineering, Shanghai University of Engineering Science, Shanghai, 201620, China;
^cR&D Center, TANGSTEEL Company, HBIS Group, Tangshan, 063016, China;
^dShandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai, 264209, China;
^eDepartment of Mechanical Engineering, Tsinghua University, Beijing, 100084, China;
^fSchool of Materials Science and Engineering, Beihang University, Beijing, 100191, China

Received:2022-09-01 Revised:2023-01-03 Accepted:2023-01-05 Published:2023-06-10 Online:2023-06-05
Contact: *E-mail address: zhanghq@buaa.edu.cn (H. Zhang) .

Abstract

Abstract: In-situ SEM can intuitively observe the changes in microstructure and microcrack initiation during the deformation process of the specimen. In this paper, the microstructural evolution, mechanical properties, and damage nucleation modes of DP1180 laser welded joints were systematically discussed by the transmission electron microscope (TEM), focused ion beam (FIB), and in-situ tensile test. The precipitation of carbides and disappearance of dislocations tangles deteriorated the mechanical properties of tempered martensite in the sub-critical heat affected zone (SCHAZ), which caused its microhardness slightly decreased (∼27 HV) and also called the softened zone. The joints fractured in the SCHAZ during the tensile and Erichsen cupping tests and microcracks initiated from the tempered martensite, while the microcrack initiation of base material (BM) occurred at the ferrite/martensite interface. The dominant damage nucleation mode of the joint was tempered martensite cracking, and that of BM was ferrite/martensite interface decohesion during tests.

Key words: In-situ tensile test, DP steel, Laser welded, Damage nucleation modes

Junliang Xue, Wei Guo, Jin Yang, Mingsheng Xia, Guang Zhao, Caiwang Tan, Zhandong Wan, Jiaxuan Chi, Hongqiang Zhang. In-situ observation of microcrack initiation and damage nucleation modes on the HAZ of laser-welded DP1180 joint[J]. J. Mater. Sci. Technol., 2023, 148: 138-149.

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In-situ observation of microcrack initiation and damage nucleation modes on the HAZ of laser-welded DP1180 joint

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