Hydrogen-assisted, intergranular, fatigue crack-growth in ferritic iron: Influences of hydrogen-gas pressure and temperature variation

Yuhei Ogawa, Kensuke Umakoshi, Masami Nakamura, Osamu Takakuwa, Hisao Matsunaga

研究成果: Contribution to journalArticle査読

1 被引用数 (Scopus)

抄録

Hydrogen-assisted, fatigue crack-growth in pure iron within a low stress-intensity range was ascribed to the emergence of intergranular fracture, the significance of which was emphasized by increased hydrogen-gas pressure, while conversely mitigated by an elevation of test temperature. Based on conventional thermodynamic theory, a single parameter, GB hydrogen-coverage (θx), was used to derive a systematic, unified evaluation of such a complex reliance on the dual environmental variables. Furthermore, post-mortem microscopic analyses of the crack-wake deformation microstructures were employed to elucidate the contribution of dislocation activity regarding the triggering of IG fracture, which also varied significantly with the alteration of θx.

本文言語英語
論文番号105806
ジャーナルInternational Journal of Fatigue
140
DOI
出版ステータス出版済み - 11 2020

All Science Journal Classification (ASJC) codes

  • Modelling and Simulation
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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