Hydrogen-assisted damage in austenite/martensite dual-phase steel

Motomichi Koyama, Cemal Cem Tasan, Tatsuya Nagashima, Eiji Akiyama, Dierk Raabe, Kaneaki Tsuzaki

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

For understanding the underlying hydrogen embrittlement mechanism in transformation-induced plasticity steels, the process of damage evolution in a model austenite/martensite dual-phase microstructure following hydrogenation was investigated through multi-scale electron channelling contrast imaging and in situ optical microscopy. Localized diffusible hydrogen in martensite causes cracking through two mechanisms: (1) interaction between {1 1 0}M localized slip and {1 1 2}M twin and (2) cracking of martensite-martensite grain interfaces. The former resulted in nanovoids along the {1 1 2}M twin. The coalescence of the nanovoids generated plate-like microvoids. The latter caused shear localization on the specific plane where the crack along the martensite/martensite boundary exists, which led to additional martensite/martensite boundary cracking.

Original languageEnglish
Pages (from-to)9-18
Number of pages10
JournalPhilosophical Magazine Letters
Volume96
Issue number1
DOIs
Publication statusPublished - 2016 Jan 2
Externally publishedYes

Keywords

  • Embrittlement
  • Fe-based alloys
  • damage
  • electron channeling
  • hydrogen in metals
  • silver decoration

ASJC Scopus subject areas

  • Condensed Matter Physics

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