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

Published online by Cambridge University Press:  20 September 2017

Yu Bai ,
Yanzhong Tian ,
Si Gao ,
Akinobu Shibata  and
Nobuhiro Tsuji
Yu Bai*
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Kyoto 606-8501, Japan; and Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University, Kyoto 606-8501, Japan
Yanzhong Tian
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
Si Gao
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Kyoto 606-8501, Japan
Akinobu Shibata
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Kyoto 606-8501, Japan; and Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University, Kyoto 606-8501, Japan
Nobuhiro Tsuji*
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Kyoto 606-8501, Japan; and Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University, Kyoto 606-8501, Japan
*
a)Address all correspondence to this author. e-mail: bai.yu.6m@kyoto-u.jp
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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.

Keywords

high-manganese twining induced plasticity (TWIP) steelhydrogen embrittlementgrain boundary
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 24: Focus Issue: Mechanical Properties and Microstructure of Advanced Metallic Alloys—in Honor of Prof. Haël Mughrabi PART B , 28 December 2017 , pp. 4592 - 4604
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Mathias Göken

References

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