DP590钢/7075铝异种金属搅拌摩擦搭接焊界面组织与力学性能研究

doi:10.3901/JME.2020.06.065

机械工程学报 ›› 2020, Vol. 56 ›› Issue (6): 65-72.doi: 10.3901/JME.2020.06.065

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DP590钢/7075铝异种金属搅拌摩擦搭接焊界面组织与力学性能研究

于海洋^1,2, 胡志力^1,2

1. 武汉理工大学现代汽车零部件技术湖北省重点实验室武汉 430070;
2. 武汉理工大学汽车零部件技术湖北省协同创新中心武汉 430070

收稿日期:2019-08-30 修回日期:2019-12-26 出版日期:2020-03-20 发布日期:2020-05-12
作者简介:于海洋,男,1995年出生。主要从事异种材料连接技术的研究。E-mail:haiyang_yu188@163.com;
胡志力(通信作者),男,1983年出生,博士,副教授,博士研究生导师。主要从事汽车轻量化技术的研究。E-mail:zhilihuhit@163.com
基金资助:
国家自然科学基金（51775397）、中国汽车产业创新发展联合基金（U1564202）和湖北省技术创新专项重大项目（2019AAA007）资助项目。

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

YU Haiyang^1,2, HU Zhili^1,2

1. Hubei Key Laboratory of Advanced Technology of Automobile Components, Wuhan University of Technology, Wuhan 430070;
2. Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan 430070

Received:2019-08-30 Revised:2019-12-26 Online:2020-03-20 Published:2020-05-12

摘要/Abstract

摘要： 对7075-T6铝合金和镀锌DP590钢板进行了搅拌摩擦搭接焊，并结合焊接过程中温度场、流场数值模拟结果，研究了金属间化合物（Intermetallic compound，IMC）厚度以及钩状结构对接头力学性能的影响规律。结果表明，IMC厚度较大时，IMC层在焊接残余应力作用下产生微裂纹，降低了接头冶金结合强度，当IMC厚度由0.8 μm增大至4.3 μm时，接头拉剪载荷降低17.8%。当钩状结构高度较大时，钩状结构上下两端宽度差较大，在拉剪载荷作用下钩状结构受力不均，薄弱部位易发生应力集中而断裂，降低了接头机械结合强度，接头性能随钩状结构高度的增大而下降。

关键词: 搅拌摩擦焊, 钩状结构, 金属间化合物厚度, 力学性能

Abstract: 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.

Key words: friction stir welding, hook structure, intermetallic compound thickness, mechanical properties

中图分类号:

TG453

于海洋, 胡志力. DP590钢/7075铝异种金属搅拌摩擦搭接焊界面组织与力学性能研究[J]. 机械工程学报, 2020, 56(6): 65-72.

YU Haiyang, HU Zhili. Investigation of Interfacial Microstructure and Mechanical Properties for DP590 Steel/7075 Aluminum Dissimilar Materials Friction Stir Lap Welding Joints[J]. Journal of Mechanical Engineering, 2020, 56(6): 65-72.

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DP590钢/7075铝异种金属搅拌摩擦搭接焊界面组织与力学性能研究

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

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