Crystallographic characteristics and mechanical behavior of laser welded joints of hot roll bending parts

doi:10.1016/j.matchar.2023.113466

IMR OpenIR

	Crystallographic characteristics and mechanical behavior of laser welded joints of hot roll bending parts
	Wang, Shuwen 1; Chen, Shujun 1; Yuan, Tao 1; Jiang, Xiaoqing 1; Zhao, Pengjing 1; Ding, Wutong 2
通讯作者	Yuan, Tao(ty29@bjut.edu.cn)
	2024
发表期刊	MATERIALS CHARACTERIZATION
ISSN	1044-5803
卷号	207 页码:15
摘要	In this work, laser welding was performed on the hot roll bending parts obtained by local-induction-heating bending forming. The influence of the crystallographic characteristics of the phase transformation products in different regions of the laser welded joint on the mechanical properties was systematically studied, and the reasons for the performance degradation were discussed in detail. The results show that upper-critical HAZ (UCHAZ) forms coarse prior austenite grain (PAG) and bainite, resulting in the lowest dislocation density of 2.5 x 1014 m- 2 and the lowest impact toughness value of 46 J/cm2. Sub-critical HAZ (SCHAZ) forms tempered martensite, causing the joint to soften and the tensile strength to decrease by 18%. The number of variants in SCHAZ is the lowest, where short laths with smaller misorientations merge into long laths, and precipitates nucleation and growth occurs. The uniform orientation of the variants in SCHAZ forms low-angle grain boundaries (LAGBs), which reduces the hindrance to crack propagation, so the mechanical properties of SCHAZ decrease. In addition, the texture analysis found that UCHAZ has the highest (001)//RD orientation volume fraction, indicating that UCHAZ is most prone to rapid expansion of brittle cracks on the {001} cleavage plane, so the toughness of UCHAZ is reduced. SCHAZ has the highest {001}(110) texture volume fraction and the lowest proportion of high-angle grain boundaries (HAGB), indicating that the deformed grain structure with the {001} cleavage planes distributed along the LAGB after welding heat tempering is the main reasons for the delamination of SCHAZ.
关键词	Laser welding Microstructure Mechanical properties Crystallographic characteristics Texture
资助者	National Natural Science Foundation of China
DOI	10.1016/j.matchar.2023.113466
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	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing
WOS记录号	WOS:001165626100001
出版者	ELSEVIER SCIENCE INC
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/184526
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, Minist Educ, Welding Equipment R&D Ctr, Beijing 100124, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Wang, Shuwen,Chen, Shujun,Yuan, Tao,et al. Crystallographic characteristics and mechanical behavior of laser welded joints of hot roll bending parts[J]. MATERIALS CHARACTERIZATION,2024,207:15.
APA	Wang, Shuwen,Chen, Shujun,Yuan, Tao,Jiang, Xiaoqing,Zhao, Pengjing,&Ding, Wutong.(2024).Crystallographic characteristics and mechanical behavior of laser welded joints of hot roll bending parts.MATERIALS CHARACTERIZATION,207,15.
MLA	Wang, Shuwen,et al."Crystallographic characteristics and mechanical behavior of laser welded joints of hot roll bending parts".MATERIALS CHARACTERIZATION 207(2024):15.