Effect of hydrogen and stress concentration on the notch tensile strength of AISI 4135 steel

Maoqiu Wang, Eiji Akiyama, Kaneaki Tsuzaki

Research output: Contribution to journalArticle

158 Citations (Scopus)

Abstract

The quantitative relationship between notch tensile strength and diffusible hydrogen content has been investigated for the AISI 4135 steel at 1320 MPa. The notch tensile strength was obtained by means of a slow strain rate test on circumferentially notched round bar specimens with stress concentration factors of 2.1, 3.3 and 4.9 after hydrogen charging, and the diffusible hydrogen content was then measured by thermal desorption spectrometry analysis. The diffusible hydrogen has been found to decrease the notch tensile strength in a power law manner, and the decrease is more prominent at a higher stress concentration factor. The finite element analysis results of stress and hydrogen distributions in the vicinity of the notch root have shown that the local fracture stress decreases with increasing local hydrogen concentration as the diffusible hydrogen content or stress concentration factor increases, resulting in the decrease in the notch tensile strength.

Original languageEnglish
Pages (from-to)37-46
Number of pages10
JournalMaterials Science and Engineering A
Volume398
Issue number1-2
DOIs
Publication statusPublished - 2005 May 25
Externally publishedYes

Keywords

  • Finite element analysis (FEA)
  • Hydrogen desorption
  • Hydrogen embrittlement
  • Martensitic steels
  • Slow strain rate test (SSRT)

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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