In-situ observation of hydrogen induced crack initiation in a nickel-based superalloy

Zhenbo Zhang, Gideon Obasi, Roberto Morana, Michael Preuss

Research output: Contribution to journalArticleResearchpeer-review

24 Citations (Scopus)

Abstract

Hydrogen induced crack initiation in a nickel-based superalloy was studied via in-situ Scanning Electron Microscopy observation under slow strain rate loading. Direct evidence has been obtained of crack initiation and propagation along dislocation slip bands leading to sample fracture. Post-mortem microstructural analysis showed that hydrogen induced cracking and separation along dislocation slip bands, which are along {111}γ crystallographic planes with the highest Schmid factor, leads to the formation of the typical slip-trace-like features on the quasi-cleavage surface.

Original languageEnglish
Pages (from-to)40-44
Number of pages5
JournalScripta Materialia
Volume140
DOIs
Publication statusPublished - Nov 2017
Externally publishedYes

Keywords

  • Crack initiation
  • Dislocation slip band
  • Hydrogen embrittlement
  • In-situ loading
  • Nickel-based superalloy

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