Comparison investigation on microstructure and properties of dissimilar welds by laser alignment welding and laser offset welding between Al-Si coated 1.5 GPa and novel 2 GPa press hardened steels

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外文摘要：Press hardened steel(PHS)plays a key role in the manufacture of anti-collision structural components.The formation of δ-ferrite is a suffering issue for the laser welding of Al-Si coated PHS.Oscillating laser was used to weld Al-Si coated 1.5 GPa PHS and novel 2 GPa PHS,and the effect of laser offset on the microstructure and properties of the dissimilar welded joints was studied.The results showed that a perfect weld profile was achieved by laser offset welding(LOW),without any welding defects.The δ-ferrite formed in as-received welds of laser alignment welding(LAW)with high Al content(up to 2.9 wt.%),but it disappeared with the laser offset to 2 GPa PHS,and the maximum Al content in the segregation zone reduced to 1.2 wt.%.After post-welding heat treatment,the δ-ferrite was coarsened and the α-ferrite formed in the secondary Al-rich area for the high Ac3 temperature,but the α-ferrite was few and fine in LOW welds.The hardness in the LAW welds was lower than that in the LOW welds,due to the presence of δ-ferrite,as well as less carbon content and Ti and V alloying elements.The tensile strength(1561 MPa)and elongation(5.4%)with LOW were higher than those with LAW(1490 MPa,3.1%),and the fracture occurred in the Al-Si coated PHS.It is indicated that adjusting the laser offset is effective to prevent the formation of δ-ferrite and is potential to avoid the formation of α-ferrite.It also provides a wide heat treatment temperature window for the dissimilar welds of 1.5 GPa PHS and novel 2 GPa PHS.

外文关键词：

Al-Si coated press hardened steel2 GPa press hardened steelLaser offset weldingδ-ferriteProperty

作者：

Hao-han Min、Qian Sun、Ya-jun Xing、Hong-liang Liu、Yu Chen、Xiao-nan Wang、Li-ning Sun

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作者单位：

School of Mechanical and Electrical Engineering,Soochow University,Suzhou 215002,Jiangsu,China

Technology Research Institute of Bengang Steel Plates Co.,Ltd.,Benxi 117000,Liaoning,China

Shagang School of Iron and Steel,Soochow University,Suzhou 215137,Jiangsu,China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaPostdoctoral Research Foundation of ChinaLiaoning Revitalization Talents Program

项目编号：

52005357U19082242022M712308XLYC2007066

出版年：

2024

DOI：

10.1007/s42243-023-01087-0

钢铁研究学报(英文版)

钢铁研究总院

钢铁研究学报(英文版)

CSTPCD

影响因子：0.584

ISSN：1006-706X

年,卷(期)：2024.31(10)