Investigation of Threshold Stress Intensity Factor and Plastic Deformation of Crack Tip for Hydrogen-Assisted Cracking of 2.25 Cr-1 Mo Steel

Takayuki Komamura, Tetsuo Shoji

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

For hydrogen-assisted cracking of 2.25 Cr-1 Mo steel, the evaluation of the threshold stress intensity factor for subcritical crack growth was examined by employing the slow strain rate test. Also, by the method of recrystallization, a high strain region formed at the crack tip was observed, and the effect of hydrogen on plastic deformation was studied. By this experiment, it was shown that hydrogen promoted subcritical crack growth at a low stress intensity level, K1H(40~80 MPa•m1/2) well below K1C(300~400 MP•m1/2), and hydrogen also enhanced plastic deformation at the crack tip. This result suggests that the plastic deformation which is enhanced by hydrogen exerts large effects on subcritical crack growth in hydrogen-assisted cracking of 2.25 Cr-1 Mo steel.

Original languageEnglish
Pages (from-to)283-288
Number of pages6
JournalTransactions of the Japan Society of Mechanical Engineers Series A
Volume61
Issue number582
DOIs
Publication statusPublished - 1995

Keywords

  • 2.25 Cr-1 Mo Steel
  • Energy Release Rate
  • Hydrogen Embrittlement
  • Hydrogen-Assisted Cracking
  • Plastic Deformation
  • Plastic Strain
  • Recrystallized Region
  • Slow Strain Rate Test
  • Threshold Stress Intensity

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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