期刊
METALS AND MATERIALS INTERNATIONAL
卷 22, 期 2, 页码 187-195出版社
KOREAN INST METALS MATERIALS
DOI: 10.1007/s12540-016-5579-7
关键词
metals; galvanization; embrittlement; tensile test; grain boundary
资金
- Technology Development Projects from POSCO [4.0012077]
In the present study, liquid metal embrittlement (LME) phenomenon during high temperature deformation was investigated for 3 grades of Zn-coated high strength automotive steel sheets consisting of different phases. Hot tensile tests were conducted for each alloy to compare their LME sensitivities at temperature ranges between 600 and 900 degrees C with different strain rates. The results suggest that Zn embrittles all the Fe-alloy system regardless of constituent phases of the steel. As hot tensile temperature and strain rate increase, LME sensitivity increases in every alloy. Furthermore, it is observed that the critical strain, which is experimentally thought to be 0.4% of strain at temperatures over 700 degrees C, is needed for LME to occur. It is observed via TEM work that Zn diffuses along grain boundaries of the substrate alloy when the specimen is strained at high temperatures. When the specimen is exposed to the strain more than 0.4% at over 700 degrees C, the segregation level of Zn at grain boundaries seems to become critical, leading to occurrence of LME cracks.
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。
推荐
暂无数据