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Liquid Zn assisted embrittlement of advanced high strength steels with different microstructures

Title
Liquid Zn assisted embrittlement of advanced high strength steels with different microstructures
Authors
Geunsu JungIn Soo WooSuh, DWKim, SJ
Date Issued
Feb-2016
Publisher
The Korean Institute of Metals and Materials
Abstract
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 °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 °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 °C, the segregation level of Zn at grain boundaries seems to become critical, leading to occurrence of LME cracks.
URI
http://oasis.postech.ac.kr/handle/2014.oak/36746
ISSN
1598-9623
Article Type
Article
Citation
Metals and Materials International, vol. 22, no. 2, page. 187 - 195, 2016-02
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김성준KIM, SUNG JOON
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