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 article

1 Citation (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 - Jun 1 2019

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Iron alloys
Austenite
Hydrogen
Martensitic transformations
Entropy
Hydrogen embrittlement
Austenitic steel
Fatigue crack propagation
Martensite
Deterioration
Ductility

All Science Journal Classification (ASJC) codes

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

Cite this

Overview of metastability and compositional complexity effects for hydrogen-resistant iron alloys : Inverse austenite stability effects. / Koyama, Motomichi; Tasan, Cemal Cem; Tsuzaki, Kaneaki.

In: Engineering Fracture Mechanics, Vol. 214, 01.06.2019, p. 123-133.

Research output: Contribution to journalReview article

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