Hydrogen diffusivity and tensile-ductility loss of solution-treated austenitic stainless steels with external and internal hydrogen

Junichiro Yamabe, Osamu Takakuwa, Hisao Matsunaga, Hisatake Itoga, Saburo Matsuoka

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)

Abstract

The effects of external and internal hydrogen on the slow-strain-rate tensile (SSRT) properties at room temperature were studied for ten types of solution-treated austenitic stainless steels containing a small amount of additive elements. The hydrogen diffusivity and solubility of the steels were measured with high-pressure hydrogen gas. The remarkable tensile-ductility loss observed in the SSRT tests was attributed to hydrogen-induced successive crack growth (HISCG) and was successfully quantified according to the nickel-equivalent content (Nieq), which represents the stability of the austenitic phase. The relative reduction in area (RRA) of the steels with a larger Nieq was influenced by the hydrogen distribution, whereas that of the steels with a smaller Nieq was not. This unique trend was interpreted with regard to the hydrogen distribution and fracture morphology (HISCG or microvoid coalescence).

Original languageEnglish
Pages (from-to)13289-13299
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume42
Issue number18
DOIs
Publication statusPublished - 2017 May 4
Externally publishedYes

Keywords

  • Additive element
  • Austenitic stainless steel
  • Hydrogen embrittlement
  • Nickel equivalent
  • Slow-strain-rate tensile test

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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