Insights into microstructure evolution and fracture mechanisms of welded joints of high strength steel patchwork components

doi:10.1016/j.jmapro.2024.03.050

IMR OpenIR

	Insights into microstructure evolution and fracture mechanisms of welded joints of high strength steel patchwork components
	Wang, Shuwen 1; Chen, Shujun 1; Yuan, Tao 1,4; Jiang, Xiaoqing 1; Zhao, Pengjing 1; Ding, Wutong 2; Li, Xiaoxu 3
通讯作者	Yuan, Tao(ty29@bjut.edu.cn)
	2024-05-30
发表期刊	JOURNAL OF MANUFACTURING PROCESSES
ISSN	1526-6125
卷号	118 页码:32-44
摘要	The hot roll bending patchwork components of B1500HS uncoated ultra-high strength steel processed at industrial scale were welded with filler wire. The microstructure, grain orientation, mechanical properties and fracture behavior of the joint were investigated. The results showed that the weld metal (WM) was mainly composed of lath martensite and lower bainite (LB). Various microstructure appeared in different positions of the HAZ, among which martensite-austenite (M-A) constituents in the incompletely quenched zone and tempered martensite (TM) in the tempered zone were the key factors determining the performance of the joint. The welded joint exhibited complex structure and anisotropic mechanical response due to the decarburization and rolling texture of the original base material (BM). In the tempered zone, lath merge and boundaries disappear lead to the annihilation of dislocations, carbide precipitation leads to reduction of mobile dislocations, and recrystallization and recovery eliminate work hardening. The reduction of the effect of dislocation strengthening results in the formation of a softening belt at 6 mm from the center of the weld, with a minimum hardness of 266 HV. The tensile strength of the joint in the rolling direction (RD) was 983 MPa, and the fracture occurred in the softening belt. Both brittle and ductile fracture features were observed. The reason why the fracture occurs in the high temperature tempered zone instead of the incompletely quenched zone was the difference in the effect of "constraint strengthening". Fracture occurred through delamination cracking along the "weak interface" owing to precipitated high-hardness cementite particles and the unfavorably oriented ferrite cleavage planes.
关键词	CMT Hot stamping Microstructure Fractography Mechanical properties
资助者	National Natural Science Foundation of China
DOI	10.1016/j.jmapro.2024.03.050
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[52075009] ; National Natural Science Foundation of China[52205323]
WOS研究方向	Engineering
WOS类目	Engineering, Manufacturing
WOS记录号	WOS:001208694400001
出版者	ELSEVIER SCI LTD
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/185725
专题	中国科学院金属研究所
通讯作者	Yuan, Tao
作者单位	1.Beijing Univ Technol, Engn Res Ctr Adv Mfg Technol Automot Components, Welding Equipment R&D Ctr, Minist Educ, Beijing 100124, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 3.Beijing Natl Innovat Inst lightweight Ltd, Beijing 100083, Peoples R China 4.Beijing Univ Technol, Beijing 100124, Peoples R China
推荐引用方式 GB/T 7714	Wang, Shuwen,Chen, Shujun,Yuan, Tao,et al. Insights into microstructure evolution and fracture mechanisms of welded joints of high strength steel patchwork components[J]. JOURNAL OF MANUFACTURING PROCESSES,2024,118:32-44.
APA	Wang, Shuwen.,Chen, Shujun.,Yuan, Tao.,Jiang, Xiaoqing.,Zhao, Pengjing.,...&Li, Xiaoxu.(2024).Insights into microstructure evolution and fracture mechanisms of welded joints of high strength steel patchwork components.JOURNAL OF MANUFACTURING PROCESSES,118,32-44.
MLA	Wang, Shuwen,et al."Insights into microstructure evolution and fracture mechanisms of welded joints of high strength steel patchwork components".JOURNAL OF MANUFACTURING PROCESSES 118(2024):32-44.