Impact of liquid metal embrittlement cracks on resistance spot weld static strength

被引：63

作者：

DiGiovanni, Christopher ^{[1
]}

Biro, Elliot ^{[1
]}

Zhou, Norman Y. ^{[1
]}

机构：

[1] Univ Waterloo, Dept Mech & Mechatron Engn, Waterloo, ON, Canada

来源：

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING | 2019年 / 24卷 / 03期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Liquid metal embrittlement; advanced high strength steel; resistance spot welding; weld strength; cracking; lap shear testing; galvanised coating; DUAL-PHASE STEELS; LOW-ALLOY; FATIGUE PROPERTIES; TENSILE; JOINTS; SHEAR; MICROSTRUCTURE; PENETRATION;

D O I：

10.1080/13621718.2018.1518363

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Advanced high strength steels used in automotive structural components are commonly protected using zinc coatings. However, the steel/zinc system creates the potential for liquid metal embrittlement (LME) during welding. Although LME cracks are known to form, limited research has found any detrimental impact of LME cracks on weld strength. In this work, a comparison of zinc coated and uncoated advanced high strength steel joints showed LME decreased strength in welds from transformation induced plasticity type microstructures and an 1100 MPa ultimate tensile strength by 43.6%. LME cracks were observed to propagate until final fracture. However, only cracks located in the periphery of the weld area were found contribute to a loss in strength.

引用

页码：218 / 224

页数：7

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