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Hydrogen embrittlement behaviors of ultrafine-grained 22Mn–0.6C austenitic twinning induced plasticity steel

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Abstract

Hydrogen embrittlement behaviors of a 22Mn–0.6C (mass%) twinning induced plasticity (TWIP) steel with the grain sizes of 21 µm (coarse grain) and 0.58 µm (ultrafine grain) were investigated by means of hydrogen precharging and subsequent slow strain rate tensile tests. The total elongation and fracture stress for both of the coarse-grained and ultrafine-grained specimens decreased by hydrogen charging. The area fraction of the brittle fracture surfaces in the ultrafine-grained specimen was much smaller than that in the coarse-grained specimen. Three-point bending test also showed that the reduction of the fracture toughness by the introduction of hydrogen was much smaller in the ultrafine-grained specimen than that in the coarse-grained specimen. It was concluded that the suppressed hydrogen embrittlement by grain refinement in the 22Mn–0.6C TWIP steel was probably due to the smaller hydrogen contents per unit grain boundary area in the finer grain-sized material.

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ACKNOWLEDGMENTS

The present study was financially supported by the Elements Strategy Initiative for Structural Materials (ESISM), the Grant-in-Aid for Scientific Research (S) (No. 15H05767), and the Grant-in-Aid for Scientific Research on Innovative Area “Bulk Nanostructured Metals” (area No. 2201), all through the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. Yu Bai was supported by the Japanese Government Scholarship. All these supports are gratefully appreciated by the authors.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Kyoto University, Kyoto, 606-8501, Japan

    Yu Bai, Si Gao, Akinobu Shibata & Nobuhiro Tsuji

  2. Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University, Kyoto, 606-8501, Japan

    Yu Bai, Akinobu Shibata & Nobuhiro Tsuji

  3. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, People’s Republic of China

    Yanzhong Tian

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  1. Yu Bai
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  2. Yanzhong Tian
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  4. Akinobu Shibata
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  5. Nobuhiro Tsuji
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Correspondence to Yu Bai.

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Bai, Y., Tian, Y., Gao, S. et al. Hydrogen embrittlement behaviors of ultrafine-grained 22Mn–0.6C austenitic twinning induced plasticity steel. Journal of Materials Research 32, 4592–4604 (2017). https://doi.org/10.1557/jmr.2017.351

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