The role of hydrogen in hydrogen embrittlement fracture of lath martensitic steel

Akihide Nagao, Cynthia D. Smith, Mohsen Dadfarnia, Petros Sofronis, Ian M. Robertson

Research output: Contribution to journalArticlepeer-review

Abstract

The microstructure associated with the hydrogen-induced features flat and quasi-cleavage on the fracture surface of a lath martensitic steel has been visualized in a transmission electron microscope by using focused-ion beam machining to extract samples perpendicular to the fracture surface. Beneath both hydrogen-induced fracture surfaces there is direct evidence, in the form of intense slip bands and destruction of lath boundaries, for significant plasticity. These observations are considered in terms of the fundamental hydrogen embrittlement mechanisms, and the conclusion is reached that the failure is driven by a hydrogen-enhanced and plasticity-mediated decohesion mechanism.

Original languageEnglish (US)
Pages (from-to)5182-5189
Number of pages8
JournalActa Materialia
Volume60
Issue number13-14
DOIs
StatePublished - Aug 1 2012

Keywords

  • Hydrogen embrittlement
  • Intergranular and quasi-cleavage fractures
  • Martensite
  • 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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