On the failure of surface damage to assess the hydrogen-enhanced deformation ahead of crack tip in a cyclically loaded austenitic stainless steel

Shuai Wang, Kelly E. Nygren, Akihide Nagao, Petros Sofronis, Ian M. Robertson

Research output: Contribution to journalArticle

Abstract

The influence of internal hydrogen on the plastic deformation ahead of a crack tip in a cyclically loaded austenitic stainless steel was determined through examination of the surface slip steps and dislocation structure. The slip steps failed to capture the totality of the sub-surface plasticity, causing the dimensions of the plastic zone generated in the presence of hydrogen to be underestimated. Regions in the hydrogen-charged steel that displayed no slip steps exhibited a similar dislocation structure to regions with slip steps in the uncharged steel. These observations are attributed to hydrogen-accelerating deformation processes and the rate of microstructure evolution.

Original languageEnglish (US)
Pages (from-to)102-106
Number of pages5
JournalScripta Materialia
Volume166
DOIs
StatePublished - Jun 2019

Keywords

  • 316L austenitic stainless steel
  • Cyclic plastic zone
  • Fatigue
  • Hydrogen embrittlement
  • Transmission electron microscopy

ASJC Scopus subject areas

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

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