Effect of high-pressure torsion processing and annealing on hydrogen embrittlement of type 304 metastable Austenitic stainless steel

Yoji Mine, Kazutaka Tachibana, Zenji Horita

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28 Citations (Scopus)

Abstract

The effect of high-pressure torsion (HPT) and annealing on hydrogen embrittlement (HE) of a type 304 stainless steel was studied by metallographic characterization and tensile test after hydrogen gas charging. A volume fraction of ∼78 pct of the austenite transformed to α′ martensite by the HPT processing at an equivalent strain of ∼30. Annealing the HPT-processed specimen at a temperature of 873 K (600 °C) for 0.5 hours decreased the α′ martensite to ∼31 pct with the average grain size reduced to ∼0.43 μm through the reverse austenitic transformation. Hydrogen charge into the HPT-processed and the HPT+annealed specimens in the hydrogen content of ∼10 to 20 ppm led to no severe HE but appeared in the solution-treated specimen. Especially the 873 K (600 °C) annealed specimen had the ∼1.4 GPa tensile strength and the ∼50 pct reduction of area (RA) despite the hydrogenation.

Original languageEnglish
Pages (from-to)3110-3120
Number of pages11
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume41
Issue number12
DOIs
Publication statusPublished - Dec 1 2010

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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