4.7 Article

Microstructural evolution of liquid metal embrittlement in resistance-spot-welded galvanized TWinning-Induced Plasticity (TWIP) steel sheets

期刊

MATERIALS CHARACTERIZATION
卷 147, 期 -, 页码 233-241

出版社

ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2018.11.008

关键词

Liquid metal embrittlement; Resistance spot welding; Galvanized TWinning-induced plasticity; (TWIP) steel; Liquid Zn infiltration

资金

  1. POSCO [2014Y015]
  2. Brain Korea 21 PLUS Project for Center for Creative Industrial Materials

向作者/读者索取更多资源

The weldability is one of the key factors governing applications of TWinning-Induced Plasticity (TWIP) steels to automotive industries demanding high economy, environmental friendliness, and high performance. During spot welding of Zn-coated Al-containing TWIP steel sheets, liquid metal embrittlement (LME) frequently occurs by Zn infiltration into grain boundaries to form cracks, but the direct observation and detailed analysis of LME cracking are quite difficult because it occurs instantaneously within a second. Here in the present study, the LME was investigated by detailed microstructural evolutions of small Zn infiltrations or cracks as well as formation behavior of various intermetallic phases. In the heat-affected zone, the applied tensile stress and spot-welding heat tore down a diffusion-inhibiting Fe2Al5 layer formed between the Zn-coated layer and the TWIP steel substrate, and formed Zn-containing ferrite (alpha-Fe(Zn)) particles on the steel surface which provided paths for liquid Zn infiltration. alpha-Fe(Zn) particles played critical roles in accelerating the LME by reducing the ductility because they were brittle due to high contents of Zn and Al. In the present Al-containing TWIP steels, the increase in welding current generally aggravates the LME.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据