Characterization on IMC Layer Migration and Interface Properties in Dual-beam Laser Welding of AA7075/DP590 Alloys

被引：0
|
作者：
Yuan R. [1 ,2 ]
Deng S. [1 ,2 ]
Cui H. [1 ,2 ]
Ma N. [1 ,3 ]
Lu F. [1 ,2 ]
机构：
[1] Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai
[2] School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai
[3] Joining & Welding Research Institute, Osaka University, Osaka
来源：
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2020年 / 56卷 / 06期
关键词：
Al/steel dissimilar metals; Dual beam laser; Intermetallic compound(IMC); Mechanical properties; Welding-brazing;
D O I：
10.3901/JME.2020.06.033
中图分类号：
学科分类号：
摘要：
The joining of AA7075 aluminum alloy and DP590 steel are successfully conducted by dual beam laser welding brazing method. A unique phenomenon is found that the intermetallic compound (IMC) layer leaves Al/steel interface and migrates into welding seam. The migration of IMC layer only shows in the area where laser beam directly irradiates. Numerical simulation result shows the formation of such phenomenon is driven by the Marangoni Flow inside the welding pool induced by laser. It is found the migrated IMC layer near to Al/steel interface is composed of η phase and shows a compact flat morphology, which is similar to the IMC layer at Al/steel interface. On the contrary, the migrated IMC layer deep in welding seam is composed of θ phase and cracks are observed in such IMC layer with welding seam grows into cracks. There is a transition region for the η phase and θ phase inside the IMC layer. Tensile test results indicate that the migration of IMC layer will be harmful to the mechanical property of Al/steel interface because of the weak strength of newly-formed IMC layer. As a result, it's better to avoid such phenomenon happening. © 2020 Journal of Mechanical Engineering.
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页码：33 / 40
页数：7
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