Hydrogen-assisted crack propagation in pre-strained twinning-induced plasticity steel: From initiation at a small defect to failure

Abbas Mohammadi, Motomichi Koyama, Gregory Gerstein, Hans Jürgen Maier, Hiroshi Noguchi

Research output: Contribution to journalArticlepeer-review

Abstract

Hydrogen-assisted crack growth of pre-strained twinning-induced plasticity (TWIP) steel was investigated using artificial defects (micro-drilled holes), which acted as artificial crack initiation sites. Hydrogen was introduced into the specimens by electrochemical hydrogen charging during slow strain rate tensile test. The quasi-cleavage crack propagation observed was due to repeated crack initiation near the crack tip and subsequent coalescence. Crack initiation near the crack tip occurred after plastic deformation of the crack tip, and pre-straining facilitated plasticity-driven crack initiation. The early stage of plasticity-driven crack growth was sensitive to the crack length and remote stress level. Accordingly, the crack growth rate in the early stage increased with the increase in the initial defect size. In the following stage of the crack growth, the crack growth rate exhibited a complicated trend with respect to the crack length, which is possibly due to the plastic-wake-altered stress field around the crack tip, which depends on the initial defect size.

Original languageEnglish
Pages (from-to)1278-1286
Number of pages9
JournalIsij International
Volume61
Issue number4
DOIs
Publication statusPublished - 2021

Keywords

  • Crack propagation
  • Hydrogen embrittlement
  • Pre-strain
  • Quasi-cleavage
  • Twinning-induced plasticity steel

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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