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Hydrogen Embrittlement Susceptibility of Fe-Mn Binary Alloys with High Mn Content: Effects of Stable and Metastable ε-Martensite, and Mn Concentration

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Abstract

To obtain a basic understanding of hydrogen embrittlement associated with ε-martensite, we investigated the tensile behavior of binary Fe-Mn alloys with high Mn content under cathodic hydrogen charging. We used Fe-20Mn, Fe-28Mn, Fe-32Mn, and Fe-40Mn alloys. The correlation between the microstructure and crack morphology was clarified through electron backscatter diffraction measurements and electron channeling contrast imaging. ε-martensite in the Fe-20Mn alloy critically deteriorated the resistance to hydrogen embrittlement owing to transformation to α′-martensite. However, when ε-martensite is stable, hydrogen embrittlement susceptibility became low, particularly in the Fe-32Mn alloys, even though the formation of ε-martensite plates assisted boundary cracking. The Fe-40Mn alloys, in which no martensite forms even after fracture, showed higher hydrogen embrittlement susceptibility compared to the Fe-32Mn alloy. Namely, in Fe-Mn binary alloys, the Mn content has an optimal value for hydrogen embrittlement susceptibility because of the following two reasons: (1) The formation of stable ε-martensite seems to have a positive effect in suppressing hydrogen-enhanced localized plasticity, but causes boundary cracking, and (2) an increase in Mn content stabilizes austenite, suppressing martensite-related cracking, but probably decreases the cohesive energy of grain boundaries, causing intergranular cracking. As a consequence, the optimal Mn content was 32 wt pct in the present alloys.

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Acknowledgments

MK gratefully acknowledges the financial support by KAKENHI (15K18235). The Materials Manufacturing and Engineering Station at the National Institute for Materials Science supported this work through the production of the samples.

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Authors and Affiliations

  1. Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan

    Motomichi Koyama (Assistant Professor), Shota Okazaki (Graduate Student) & Kaneaki Tsuzaki (Professor)

  2. National Institute for Materials Science, 1-2-1, Sengen, Ibaraki, 305-0047, Japan

    Takahiro Sawaguchi (Chief Researcher) & Kaneaki Tsuzaki (Professor)

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  1. Motomichi Koyama
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  2. Shota Okazaki
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Correspondence to Motomichi Koyama.

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Manuscript submitted September 26, 2015.

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Koyama, M., Okazaki, S., Sawaguchi, T. et al. Hydrogen Embrittlement Susceptibility of Fe-Mn Binary Alloys with High Mn Content: Effects of Stable and Metastable ε-Martensite, and Mn Concentration. Metall Mater Trans A 47, 2656–2673 (2016). https://doi.org/10.1007/s11661-016-3431-9

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