Harmless preexisting crack in structures made of hydrogen-embrittlement sensitive materials under monotonic tension

He Liu, Shigeru Hamada, Hiroshi Noguchi

Research output: Contribution to journalConference articlepeer-review

Abstract

The interaction of hydrogen with the dislocations in the plastic zone of preexisting cracks (pre-cracks) in engineering components generally degrades the ultimate tensile strength (UTS). Hence, the crack effect coupled with hydrogen-embrittlement (HE) is widely believed to be harmful in engineering applications. However, in this study, the UTS of shallow pre-cracked structures made of interstitial-free (IF) steel, which is a hydrogen-embrittlement sensitive material, may not be wakened in hydrogen environment. Results of cylinder specimens with saturated hydrogen were experimentally and microscope-analytically compared with that of specimens without hydrogen. Then, this anti-common-sense influence of hydrogen was attributed as follows: (1) the crack propagation assisted by hydrogen enhanced localized plasticity (HELP) is stable before the onset of plastic instability because of high fracture instability toughness; and (2) the plastic strain localization at tips of the pre-crack and secondary cracks resists the onset of plastic instability. Additionally, the applicability of such a shallow crack effect coupled with HE presented by this study in engineering applications was discussed.

Original languageEnglish
Article number012098
JournalIOP Conference Series: Materials Science and Engineering
Volume774
Issue number1
DOIs
Publication statusPublished - Mar 26 2020
Event2020 4th International Conference on Material Science and Technology, ICMST 2020 - Wuhan, Hubei, China
Duration: Jan 22 2020Jan 23 2020

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)

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