Characterization of intermetallic compound at the interfaces of Al-steel resistance spot welds

被引：109

作者：

Wan, Zixuan ^{[1
]}

Wang, Hui-Ping ^{[2
]}

Chen, Nannan ^{[1
]}

Wang, Min ^{[1
]}

Carlson, Blair E. ^{[2
]}

机构：

[1] Shanghai Jiao Tong Univ, Shanghai Key Lab Mat Laser Proc & Modificat, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China

[2] GM Global R&D, Mfg Syst Res, Warren, MI 48092 USA

来源：

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY | 2017年 / 242卷

基金：

上海市自然科学基金;

关键词：

Al-steel joint; Resistance spot welding (RSW); Intermetallic compound (IMC); IMC thickness distribution; Welding parameters; Process simulation; MOLTEN ALUMINUM; SOLID IRON; GROWTH; ALLOY; SIMULATION; LAYER;

D O I：

10.1016/j.jmatprotec.2016.11.017

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This study characterizes the interfaces of Al-steel joints generated by resistance spot welding (RSW) processes. Two types of intermetallic compound (IMC) layers at the interface are characterized and discussed. The first type, located in central area of the interface, is composed of tongue-like Fe2Al5 adjacent to the steel and serrated-like FeAl3 adjacent to the Al; the second type, a mixture of FeAl3 and Al, lies in the periphery of the joint interface. Formation mechanisms of the two types of IMC layer observed are proposed and discussed in the paper. The thickness distributions of the IMC layer generated by different welding parameters are predicted based on the dynamic interfacial temperature histories from Al-steel RSW process simulation. The predicted IMC thickness distributions are validated against physical measurements and show good agreement. A bimodal IMC thickness distribution is found when an adequately long welding time is applied. This is found to be related to lower interfacial temperature at the center of Al-steel interface than what in the surrounding area after about 200 ms of welding due to strong cooling effect by the electrode. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：12 / 23

页数：12

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