Investigation of Interfacial Microstructure and Mechanical Properties for DP590 Steel/7075 Aluminum Dissimilar Materials Friction Stir Lap Welding Joints

被引：0

作者：

Yu H. ^{[1
,2
]}

Hu Z. ^{[1
,2
]}

机构：

[1] Hubei Key Laboratory of Advanced Technology of Automobile Components, Wuhan University of Technology, Wuhan

[2] Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan

来源：

Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2020年 / 56卷 / 06期

关键词：

Friction stir welding; Hook structure; Intermetallic compound thickness; Mechanical properties;

D O I：

10.3901/JME.2020.06.065

中图分类号：

学科分类号：

摘要：

7075-T6 aluminum alloy and galvanized DP590 steel are friction stir lap welded. Combining with the numerical simulation results of temperature field and material flow during welding, the effects of intermetallic compound (IMC) thickness and hook structure on the mechanical properties of the joint are studied. The results show that when the thickness of IMC is large, the microcracks are easy to initiate and expand at the IMC layer, which reduces the joint metallurgical bond strength. As the IMC thickness increasing from 0.8 μm to 4.3 μm, the joint strength decreases by 17.8%. The width difference between the upper and lower ends of the higher hook structure is larger. Under the tensile shear load, the hook structure is unevenly stressed. The weak part is prone to stress concentration and fracture, which reduces the mechanical bond strength of the joint. As the height of the hook structure increases, the strength of the joint gradually decreases. © 2020 Journal of Mechanical Engineering.

引用

页码：65 / 72

页数：7

共 24 条

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