Hydrogen trapping in carbon supersaturated α‑iron and its decohesion effect in martensitic steel

W. T. Geng, Vei Wang, Jin Xu Li, Nobuyuki Ishikawa, Hajime Kimizuka, Kaneaki Tsuzaki, Shigenobu Ogata

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Our first-principles calculations demonstrate that hydrogen is more stable in carbon supersaturated martensite than in α‑iron, due to the carbon-induced tetragonality in martensite lattice. The trapped hydrogen leads to remarkable decohesion between (110) planes both inside the martensite and along the martensite/ferrite interface, with the former being more significant than the latter. This decohesion can explain recent precise observations that in martensite/ferrite dual-phase steels the hydrogen-promoted crack was initiated in the martensite region and that in lath martensite steel it propagated not on lath boundaries but showed quasi-cleavage feature along (110) planes at very high hydrogen concentration.

Original languageEnglish
Pages (from-to)79-83
Number of pages5
JournalScripta Materialia
Volume149
DOIs
Publication statusPublished - May 1 2018

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Martensitic steel
martensite
Martensite
Hydrogen
Carbon
Iron
trapping
steels
iron
carbon
hydrogen
Steel
Ferrite
ferrites
cleavage
cracks
Cracks

All Science Journal Classification (ASJC) codes

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

Cite this

Hydrogen trapping in carbon supersaturated α‑iron and its decohesion effect in martensitic steel. / Geng, W. T.; Wang, Vei; Li, Jin Xu; Ishikawa, Nobuyuki; Kimizuka, Hajime; Tsuzaki, Kaneaki; Ogata, Shigenobu.

In: Scripta Materialia, Vol. 149, 01.05.2018, p. 79-83.

Research output: Contribution to journalArticle

Geng, W. T. ; Wang, Vei ; Li, Jin Xu ; Ishikawa, Nobuyuki ; Kimizuka, Hajime ; Tsuzaki, Kaneaki ; Ogata, Shigenobu. / Hydrogen trapping in carbon supersaturated α‑iron and its decohesion effect in martensitic steel. In: Scripta Materialia. 2018 ; Vol. 149. pp. 79-83.
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