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 journalArticlepeer-review

9 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 2018

All Science Journal Classification (ASJC) codes

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

Fingerprint Dive into the research topics of 'Hydrogen trapping in carbon supersaturated α‑iron and its decohesion effect in martensitic steel'. Together they form a unique fingerprint.

Cite this