Mechanical properties and fracture behaviors in remote laser spot welding of quenching and partitioning 980 steel

doi:10.1016/j.optlastec.2021.107053

CIOMP OpenIR

	Mechanical properties and fracture behaviors in remote laser spot welding of quenching and partitioning 980 steel
	W. Zhang; W. Tao and S. Yang
	2021
发表期刊	Optics and Laser Technology
ISSN	303992
卷号	140
摘要	Quenching and partitioning (Q&P) steel is one of most critical third generation steels in the automotive industry, which provides excellent mechanical properties and have a huge potential to significantly reduce vehicle weight and improve fuel efficiency. One of the bottlenecks for their applications in the automotive industry is the poor weldability. In this paper, a newly-developed remote laser spot welding (R-LSW) process was used to weld Q&P steel with laser beam moving along a spiral path. The welds with full penetration were obtained with laser power ranged between 2400 W and 3600 W, the weld morphology and mechanical properties of the joints were consistent, except for a little drop in case of 3600 W with the crater size of 0.65 mm. Under the shear tensile force, all the welds failed in partial thickness-partial pullout (PT-PP) mode, which was attributed to the formation of a large weld diameter. The weld failure process can be divided into four stages: (I) crack initiation; (II) crack propagation along the thickness and circumference of the joint; (III) crack propagation along the circumference of the joint; and (IV) instantaneous fracture. Furthermore, it was found that the coarse grain heat affected zone (CG-HAZ) has a lowest fraction of high-angle grain boundaries (HAGBs), resulting in the crack propagated along the CG-HAZ during stage II. During crack propagation, the fracture took place as a ductile fracture, but the instantaneous fracture occurred in quasi-cleavage characteristic. 2021 Elsevier Ltd
DOI	10.1016/j.optlastec.2021.107053
URL	查看原文
收录类别	SCI ; EI
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/65405
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	W. Zhang,W. Tao and S. Yang. Mechanical properties and fracture behaviors in remote laser spot welding of quenching and partitioning 980 steel[J]. Optics and Laser Technology,2021,140.
APA	W. Zhang,&W. Tao and S. Yang.(2021).Mechanical properties and fracture behaviors in remote laser spot welding of quenching and partitioning 980 steel.Optics and Laser Technology,140.
MLA	W. Zhang,et al."Mechanical properties and fracture behaviors in remote laser spot welding of quenching and partitioning 980 steel".Optics and Laser Technology 140(2021).

条目包含的文件		下载所有文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
Mechanical propertie（24981KB）	期刊论文	出版稿	开放获取	CC BY-NC-SA	浏览下载