The effect of nanosized (Ti,Mo)C precipitates on hydrogen embrittlement of tempered lath martensitic steel

Akihide Nagao, May L. Martin, Mohsen Dadfarnia, Petros Sofronis, Ian M. Robertson

Research output: Contribution to journalArticlepeer-review

Abstract

Nanosized (Ti,Mo)C precipitates in a high-strength tempered lath martensitic steel are shown to increase resistance to hydrogen embrittlement. The hydrogen-induced failure mode transitions from failure along lath and prior austenite boundaries in the absence of the (Ti,Mo)C precipitates to a mixed failure mode of microvoid coalescence and lath boundary failure in their presence. In the absence of hydrogen and regardless of the presence or absence of the (Ti,Mo)C precipitates, failure occurs via ductile microvoid coalescence. By correlating the macroscale mechanical properties, the fractography of the resulting failure surfaces and observation of the evolved deformation structure immediately beneath the fracture surfaces, a hydrogen-enhanced and plasticity-mediated failure mechanism is proposed in which the role of the nanosized (Ti,Mo)C precipitates is to serve as effective traps for hydrogen.

Original languageEnglish (US)
Pages (from-to)244-254
Number of pages11
JournalActa Materialia
Volume74
DOIs
StatePublished - Aug 1 2014

Keywords

  • Hydrogen embrittlement
  • Martensite
  • Nanosized (Ti,Mo)C precipitates
  • Scanning electron microscopy
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Ceramics and Composites
  • Metals and Alloys
  • Polymers and Plastics
  • Electronic, Optical and Magnetic Materials

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