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

doi:10.1016/j.optlastec.2021.107053

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	Mechanical properties and fracture behaviors in remote laser spot welding of quenching and partitioning 980 steel
	W. Zhang; W. Tao and S. Yang
刊名	Optics and Laser Technology
	2021
卷号	140
ISSN号	303992
DOI	10.1016/j.optlastec.2021.107053
英文摘要	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
URL标识	查看原文
内容类型	期刊论文
源URL	[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).