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

研究成果: Article査読

1 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)1322-1329
ページ数8
ジャーナルIsij International
61
4
DOI
出版ステータスPublished - 2021

ASJC Scopus subject areas

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

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