Hydrogen embrittlement of binary high Mn austenitic steels

Motomichi Koyama, Takahiro Sawaguchi, Kaneaki Tsuzaki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We used Fe-20Mn, Fe-28Mn, Fe-32Mn, and Fe-40Mn alloys. ε-martensite in the Fe-20Mn alloy critically deteriorated the resistance to hydrogen embrittlement owing 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.% in the present alloys.

Original languageEnglish
Title of host publicationICF 2017 - 14th International Conference on Fracture
EditorsEmmanuel E. Gdoutos
PublisherInternational Conference on Fracture
Pages75-76
Number of pages2
ISBN (Electronic)9780000000002
Publication statusPublished - 2017
Event14th International Conference on Fracture, ICF 2017 - Rhodes, Greece
Duration: Jun 18 2017Jun 20 2017

Publication series

NameICF 2017 - 14th International Conference on Fracture
Volume1

Conference

Conference14th International Conference on Fracture, ICF 2017
Country/TerritoryGreece
CityRhodes
Period6/18/176/20/17

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction

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