Effects of stress and plastic strain on hydrogen embrittlement fracture of a U-bent martensitic steel sheet

Shibayama Yuki, Hojo Tomohiko, Koyama Motomichi, Saitoh Hiroyuki, Shiro Ayumi, Yasuda Ryo, Shobu Takahisa, Matsuno Takashi, Akiyama Eiji

Research output: Contribution to journalArticlepeer-review

Abstract

The effects of stress and plastic strain distributions on the hydrogen embrittlement fracture of the U-bent martensitic steel sheet specimen were investigated. The hydrogen embrittlement testing of the U-bent specimen was performed. Fracture morphology mainly consisting of intergranular fracture was found inside the hydrogen charged U-bent specimen, which indicated that the crack initiation took place in the interior, and shear lips were found near both surfaces of the U-bent sheet. The synchrotron X-ray diffraction measurement and the finite element simulation were utilized to analyze the stress and plastic strain distributions in the thickness direction of the U-bent specimen. The elastic strain distributions obtained by the measurement showed a good agreement with the simulation. The crack initiation site of the hydrogen-charged U-bent specimen was considered to be correspondent with the region where the tensile stress was the highest, suggesting that the maximum tensile stress predominantly determine the crack initiation.

Original languageEnglish
Pages (from-to)1322-1329
Number of pages8
JournalIsij International
Volume61
Issue number4
DOIs
Publication statusPublished - 2021

Keywords

  • Finite element simulation
  • Hydrogen embrittlement
  • Martensitic steel
  • X-ray diffraction

ASJC Scopus subject areas

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

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