Fatigue damage study of cold metal transition fusion-brazed aluminium/steel dissimilar joints

被引：4

作者：

Xiong, Qi ^{[1
]}

Yang, Shanglei ^{[1
,2
]}

Wang, Yan ^{[1
]}

Gu, Jiaxin ^{[1
]}

Duan, Chenfeng ^{[1
]}

Sang, Sang ^{[1
]}

机构：

[1] Shanghai Univ Engn Sci, Coll Mat Engn, Shanghai 201620, Peoples R China

[2] Shanghai Univ Engn Sci, Shanghai Collaborat Innovat Ctr Laser Adv Mfg Tec, Shanghai, Peoples R China

来源：

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING | 2020年 / 25卷 / 04期

基金：

中国国家自然科学基金;

关键词：

Aluminium; steel dissimilar joining; CMT welding-brazing; ratcheting effect; fatigue fracture; ALUMINUM-ALLOY; INTERFACIAL MICROSTRUCTURE; BEHAVIOR; STEEL;

D O I：

10.1080/13621718.2019.1685065

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An aluminium/steel CMT-welded joint is mainly composed of fusion zone (FZ), interfacial intermetallic compound (IMC) zone, and heat-affected zone (HAZ). IMC and FZ are the weakest link in the welded joint. The fatigue fracture indicates that the lattice distortion caused by the lattice mismatch of Fe2Al5 and Fe is more likely to engender dislocation slipping and cracks easily nucleate during the fatigue testing. The hysteresis loop is shifted to the right, which indicating that the specimen experiences a ratcheting effect. In the high-stress condition, the cyclic hardening induced by the ratcheting strain is much stronger than that in the lower stress condition, which improves the fatigue life of the materials.

引用

页码：265 / 272

页数：8

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