Influence of stress re-distribution on hydrogen-induced fatigue crack propagation

Daisuke Sasaki, Motomichi Koyama, Hiroshi Noguchi

Research output: Contribution to journalArticle

Abstract

In order to clarify influence of stress re-distribution effect on hydrogen-induced fatigue crack propagation, we investigated fatigue crack propagation rates and brittle-like fracture ratio. The experiments were conducted in nitrogen and hydrogen gas atmosphere with ferrite-pearlite steels having different pearlite ratio, respectively. The crack propagation rates and the brittle-like fracture ratio decreased as pearlite ratio increased. To explain the changes of crack propagation rates and fracture ratio, we proposed that the stress re-distribution effect causing stress and strain relaxation at a crack tip contributes to suppression of the hydrogen-induced fatigue crack propagation. As a verification, finite element methods were operated with models having different width of the hard phase and different distance between a crack tip and a hard phase in plane stress and strain conditions, respectively. The finite element method analysis showed that stress re-distribution effect was smaller in plane strain condition than that in plane stress condition, indicating that a large hardness difference is crucial in plane stress condition to suppress the hydrogen-induced fatigue crack propagation.

Original languageEnglish
Pages (from-to)1683-1690
Number of pages8
Journalisij international
Volume59
Issue number9
DOIs
Publication statusPublished - Jan 1 2019

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Fatigue crack propagation
Hydrogen
Pearlite
Crack tips
Crack propagation
Finite element method
Strain relaxation
Steel
Stress relaxation
Ferrite
Nitrogen
Gases
Hardness
Experiments

All Science Journal Classification (ASJC) codes

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

Cite this

Influence of stress re-distribution on hydrogen-induced fatigue crack propagation. / Sasaki, Daisuke; Koyama, Motomichi; Noguchi, Hiroshi.

In: isij international, Vol. 59, No. 9, 01.01.2019, p. 1683-1690.

Research output: Contribution to journalArticle

Sasaki, Daisuke ; Koyama, Motomichi ; Noguchi, Hiroshi. / Influence of stress re-distribution on hydrogen-induced fatigue crack propagation. In: isij international. 2019 ; Vol. 59, No. 9. pp. 1683-1690.
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