Overview of hydrogen embrittlement in high-Mn steels

Motomichi Koyama, Eiji Akiyama, Young Kook Lee, Dierk Raabe, Kaneaki Tsuzaki

Research output: Contribution to journalReview articlepeer-review

240 Citations (Scopus)


Hydrogen and fuels derived from it will serve as the energy carriers of the future. The associated rapidly growing demand for hydrogen energy-related infrastructure materials has stimulated multiple engineering and scientific studies on the hydrogen embrittlement resistance of various groups of high performance alloys. Among these, high-Mn steels have received special attention owing to their excellent strength – ductility – cost relationship. However, hydrogen-induced delayed fracture has been reported to occur in deep-drawn cup specimens of some of these alloys. Driven by this challenge we present here an overview of the hydrogen embrittlement research carried out on high-Mn steels. The hydrogen embrittlement susceptibility of high-Mn steels is particularly sensitive to their chemical composition since the various alloying elements simultaneously affect the material's stacking fault energy, phase stability, hydrogen uptake behavior, surface oxide scales and interstitial diffusivity, all of which affect the hydrogen embrittlement susceptibility. Here, we discuss the contribution of each of these factors to the hydrogen embrittlement susceptibility of these steels and discuss pathways how certain embrittlement mechanisms can be hampered or even inhibited. Examples of positive effects of hydrogen on the tensile ductility are also introduced.

Original languageEnglish
Pages (from-to)12706-12723
Number of pages18
JournalInternational Journal of Hydrogen Energy
Issue number17
Publication statusPublished - 2017 Apr 27


  • Austenitic steel
  • Deformation twinning
  • Hydrogen embrittlement
  • Hydrogen segregation
  • Martensitic transformation


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