Mechanical characterisation of microstructural evolution in 304 stainless steel subjected to high-pressure torsion with and without hydrogen pre-charging

Yoji Mine, Kaoru Koga, Kazuki Takashima, Zenji Horita

研究成果: ジャーナルへの寄稿記事

6 引用 (Scopus)

抄録

Micro-tensile tests were employed on a 304 metastable austenitic stainless steel to mechanically characterise the microstructures developed by processing through high-pressure torsion (HPT) with and without hydrogen pre-charging. The martensite formed by HPT processing of hydrogen-containing austenite exhibited low yield and tensile strengths but a high reduction of area compared to the one processed in the absence of hydrogen. This may be because dynamic martensite formed with hydrogen contains more retained austenite. Hydrogen charging into the austenite allowed the formation of ε-martensite, instead of deformation twinning, as an intermediate phase in the transformation to α'-martensite, which led to variation in the plastic behaviour. The inhomogeneity of the microstructure and the defects produced by deformation with hydrogen build a foundation but hardly play a crucial role in the hydrogen embrittlement (HE) of metastable austenitic steels. Excess hydrogen due to the dynamic martensitic transformation of hydrogen-containing austenite localises deformation in the retained austenite between the martensite regions formed, leading to the HE of metastable austenitic steels.

元の言語英語
ページ(範囲)87-95
ページ数9
ジャーナルMaterials Science and Engineering A
661
DOI
出版物ステータス出版済み - 4 20 2016

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Stainless Steel
Microstructural evolution
Torsional stress
torsion
charging
stainless steels
Hydrogen
Stainless steel
austenite
martensite
Martensite
Austenite
hydrogen
hydrogen embrittlement
Hydrogen embrittlement
Austenitic steel
steels
microstructure
Microstructure
austenitic stainless steels

All Science Journal Classification (ASJC) codes

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

これを引用

Mechanical characterisation of microstructural evolution in 304 stainless steel subjected to high-pressure torsion with and without hydrogen pre-charging. / Mine, Yoji; Koga, Kaoru; Takashima, Kazuki; Horita, Zenji.

:: Materials Science and Engineering A, 巻 661, 20.04.2016, p. 87-95.

研究成果: ジャーナルへの寄稿記事

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