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

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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.

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Authors and Affiliations

  1. Graduate Institute of Ferrous Technology, POSTECH, Pohang, 37673, Korea

    Geunsu Jung, Dong Woo Suh & Sung-Joon Kim

  2. Technical Research Laboratory, POSCO, Pohang, 37859, Korea

    In Soo Woo

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  1. Geunsu Jung
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  2. In Soo Woo
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  3. Dong Woo Suh
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  4. Sung-Joon Kim
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Correspondence to Sung-Joon Kim.

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Jung, G., Woo, I.S., Suh, D.W. et al. Liquid Zn assisted embrittlement of advanced high strength steels with different microstructures. Met. Mater. Int. 22, 187–195 (2016). https://doi.org/10.1007/s12540-016-5579-7

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  • DOI: https://doi.org/10.1007/s12540-016-5579-7

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