Localized Plasticity and Associated Cracking in Stable and Metastable High-Entropy Alloys Pre-Charged with Hydrogen

Kenshiro Ichii, Motomichi Koyama, Cemal Cem Tasan, Kaneaki Tsuzaki

研究成果: ジャーナルへの寄稿Conference article

1 引用 (Scopus)

抄録

We investigated hydrogen embrittlement in Fe20Mn20Ni20Cr20Co and Fe30Mn10Cr10Co (at.%) alloys pre-charged with 100 MPa hydrogen gas by tensile testing at three initial strain rates of 10 -4 , 10 -3 , and 10 -2 s -1 at ambient temperature. The alloys are classified as stable and metastable austenite-based high-entropy alloys (HEAs), respectively. Both HEAs showed the characteristic hydrogen-induced degradation of tensile ductility. Electron backscatter diffraction analysis indicated that the reduction in ductility by hydrogen pre-charging was associated with localized plasticity-assisted intergranular crack initiation. It should be noted as an important finding that hydrogen-assisted cracking of the metastable HEA occurred not through a brittle mechanism but through localized plastic deformation in both the austenite and ϵ-martensite phases.

元の言語英語
ページ(範囲)716-721
ページ数6
ジャーナルProcedia Structural Integrity
13
DOI
出版物ステータス出版済み - 1 1 2018
イベント22nd European Conference on Fracture, ECF 2018 - Belgrade, セルビア
継続期間: 8 25 20188 26 2018

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Plasticity
Hydrogen
Entropy
Austenite
Ductility
Hydrogen embrittlement
Tensile testing
Crack initiation
Martensite
Electron diffraction
Strain rate
Plastic deformation
Gases
Degradation
Temperature

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Mechanics of Materials
  • Civil and Structural Engineering
  • Materials Science(all)

これを引用

Localized Plasticity and Associated Cracking in Stable and Metastable High-Entropy Alloys Pre-Charged with Hydrogen. / Ichii, Kenshiro; Koyama, Motomichi; Tasan, Cemal Cem; Tsuzaki, Kaneaki.

:: Procedia Structural Integrity, 巻 13, 01.01.2018, p. 716-721.

研究成果: ジャーナルへの寄稿Conference article

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abstract = "We investigated hydrogen embrittlement in Fe20Mn20Ni20Cr20Co and Fe30Mn10Cr10Co (at.{\%}) alloys pre-charged with 100 MPa hydrogen gas by tensile testing at three initial strain rates of 10 -4 , 10 -3 , and 10 -2 s -1 at ambient temperature. The alloys are classified as stable and metastable austenite-based high-entropy alloys (HEAs), respectively. Both HEAs showed the characteristic hydrogen-induced degradation of tensile ductility. Electron backscatter diffraction analysis indicated that the reduction in ductility by hydrogen pre-charging was associated with localized plasticity-assisted intergranular crack initiation. It should be noted as an important finding that hydrogen-assisted cracking of the metastable HEA occurred not through a brittle mechanism but through localized plastic deformation in both the austenite and ϵ-martensite phases.",
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AU - Tasan, Cemal Cem

AU - Tsuzaki, Kaneaki

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N2 - We investigated hydrogen embrittlement in Fe20Mn20Ni20Cr20Co and Fe30Mn10Cr10Co (at.%) alloys pre-charged with 100 MPa hydrogen gas by tensile testing at three initial strain rates of 10 -4 , 10 -3 , and 10 -2 s -1 at ambient temperature. The alloys are classified as stable and metastable austenite-based high-entropy alloys (HEAs), respectively. Both HEAs showed the characteristic hydrogen-induced degradation of tensile ductility. Electron backscatter diffraction analysis indicated that the reduction in ductility by hydrogen pre-charging was associated with localized plasticity-assisted intergranular crack initiation. It should be noted as an important finding that hydrogen-assisted cracking of the metastable HEA occurred not through a brittle mechanism but through localized plastic deformation in both the austenite and ϵ-martensite phases.

AB - We investigated hydrogen embrittlement in Fe20Mn20Ni20Cr20Co and Fe30Mn10Cr10Co (at.%) alloys pre-charged with 100 MPa hydrogen gas by tensile testing at three initial strain rates of 10 -4 , 10 -3 , and 10 -2 s -1 at ambient temperature. The alloys are classified as stable and metastable austenite-based high-entropy alloys (HEAs), respectively. Both HEAs showed the characteristic hydrogen-induced degradation of tensile ductility. Electron backscatter diffraction analysis indicated that the reduction in ductility by hydrogen pre-charging was associated with localized plasticity-assisted intergranular crack initiation. It should be noted as an important finding that hydrogen-assisted cracking of the metastable HEA occurred not through a brittle mechanism but through localized plastic deformation in both the austenite and ϵ-martensite phases.

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