Revisiting the effects of hydrogen on deformation-induced γ-ε martensitic transformation

Motomichi Koyama, Natsuki Terao, Kaneaki Tsuzaki

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Hydrogen effects on deformation-induced γ-ε martensitic transformation were revisited in terms of morphology, number density, and fraction of ε-martensite in strained austenitic steel. Hydrogen charging suppresses the stress-assisted nucleation of the martensite in stress criterion, which is consistent with a previous finding that hydrogen suppresses thermally induced γ-ε martensitic transformation. At an identical strain (e.g., 4%), hydrogen charging decreases the average thickness of ε-martensite plates, but increases their number density. As a result, hydrogen charging promotes deformation-induced γ-ε martensitic transformation when compared at the identical strain. These facts provide the following two conclusions: (1) hydrogen increases the required elastic strain energy for martensite nucleation and (2) hydrogen promotes a dislocation-motion-related nucleation process.

Original languageEnglish
Pages (from-to)197-200
Number of pages4
JournalMaterials Letters
Volume249
DOIs
Publication statusPublished - Aug 15 2019

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Martensitic transformations
martensitic transformation
Hydrogen
martensite
Martensite
hydrogen
charging
Nucleation
nucleation
Austenitic steel
Strain energy
steels

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Revisiting the effects of hydrogen on deformation-induced γ-ε martensitic transformation. / Koyama, Motomichi; Terao, Natsuki; Tsuzaki, Kaneaki.

In: Materials Letters, Vol. 249, 15.08.2019, p. 197-200.

Research output: Contribution to journalArticle

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