Overview of metastability and compositional complexity effects for hydrogen-resistant iron alloys: Inverse austenite stability effects

Motomichi Koyama, Cemal Cem Tasan, Kaneaki Tsuzaki

Research output: Contribution to journalReview articlepeer-review

8 Citations (Scopus)

Abstract

The main factors affecting resistance to hydrogen-assisted cracking are hydrogen diffusivity and local ductility. In this context, we note fcc (γ) to hcp (ε) martensitic transformation, instead of γ to bcc (ά) martensitic transformation. The γ-ε martensitic transformation decreases the local hydrogen diffusivity, which thereby can increase strength without critical deterioration of hydrogen embrittlement resistance. Furthermore, ε-martensite in a high-entropy alloy is extraordinary ductile. Consequently, the metastable high-entropy alloys showed lower fatigue crack growth rates under a hydrogen effect compared with those of conventional metastable austenitic steels such as type 304.

Original languageEnglish
Pages (from-to)123-133
Number of pages11
JournalEngineering Fracture Mechanics
Volume214
DOIs
Publication statusPublished - 2019 Jun 1

Keywords

  • Fatigue crack growth
  • Hydrogen embrittlement
  • Plasticity
  • Slow strain rate tests
  • Steels

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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