Hydrogen-induced ductility loss of austenitic stainless steels for slow strain rate tensile testing in high-pressure hydrogen gas

Saburo Matsuoka, Junichiro Yamabe, Hisao Matsunaga

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

抄録

For slow strain rate tensile (SSRT) test in hydrogen gas, the degradation in relative reduction in area (RRA) of 300-series austenitic stainless steels is mainly attributed to hydrogen-assisted surface crack growth (HASCG) accompanied by quasi-cleavages. To establish novel criteria for authorizing various austenitic stainless steels for use in high-pressure gaseous hydrogen, a mechanism of the HASCG should be elucidated. At first, this study performed SSRT tests on six types of austenitic stainless steels, Types 304, 316, 316L, 306 (hi-Ni), 304N2 and 304 (N), in high-pressure hydrogen gas and showed that the RRAs were successfully quantified in terms of a newly-proposed nickel-equivalent equation. Then, to elucidate the microscopic mechanism of the HASCG, elasto-plastic fracture toughness (JIC), fatigue crack growth (FCG) and fatigue life tests on Types 304, 316 and 316L were carried out in high-pressure hydrogen gas. The results demonstrated that the SSRT surface crack grew via the same mechanism as for the JIC and fatigue cracks, i.e., these cracks successively grow with a sharp shape under the loading process, due to local slip deformations near the crack tip by hydrogen. Detailed observations of SSRT surface cracks on Types 304 and 316L were also performed, exhibiting that the onset of the HASCG occurred at the true strain of 0.1 or larger in high-pressure hydrogen gas.

本文言語英語
ホスト出版物のタイトルMaterials Structure and Micromechanics of Fracture VIII
編集者Pavel Sandera
出版社Trans Tech Publications Ltd
ページ259-264
ページ数6
ISBN(印刷版)9783038356264
DOI
出版ステータス出版済み - 2017
イベント8th International Conference on Materials Structure and Micromechanics of Fracture, MSMF8 - Brno, チェコ共和国
継続期間: 7 27 20167 29 2016

出版物シリーズ

名前Solid State Phenomena
258 SSP
ISSN(印刷版)1012-0394
ISSN(電子版)1662-9779

その他

その他8th International Conference on Materials Structure and Micromechanics of Fracture, MSMF8
Countryチェコ共和国
CityBrno
Period7/27/167/29/16

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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