Determination of the critical hydrogen concentration for delayed fracture of high strength steel by constant load test and numerical calculation

Maoqiu Wang, Eiji Akiyama, Kaneaki Tsuzaki

Research output: Contribution to journalArticle

82 Citations (Scopus)

Abstract

The critical hydrogen concentration for hydrogen induced delayed fracture of the AISI 4135 steel at 1320 and 1450 MPa has been determined by constant load tests in combination with numerical calculations, and thus the concept of a critical hydrogen concentration has been verified. The time to fracture was obtained for circumferentially notched round bar specimens under a constant load after electrochemically pre-charged with various hydrogen contents. A numerical model was then developed for calculating the accumulated hydrogen concentration in the vicinity of the notch root, taking into account the driving effect of the hydrostatic stress on hydrogen transport. The results showed that the delayed fracture of the steel occurred when a critical hydrogen concentration at the location of the stress peak was reached by accumulation, and that the time to fracture was related to the stress-driven hydrogen accumulation process. The critical hydrogen concentration was dependent not only on the strength level, but also on the stress concentration factor of the specimens.

Original languageEnglish
Pages (from-to)2189-2202
Number of pages14
JournalCorrosion Science
Volume48
Issue number8
DOIs
Publication statusPublished - 2006 Aug 1
Externally publishedYes

Keywords

  • A. Steel
  • B. Modelling studies
  • C. Delayed fracture
  • C. Hydrogen embrittlement

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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