Hydrogen environment embrittlement of stable austenitic steels |
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Authors: | Thorsten Michler Chris San Marchi Jörg Naumann Sebastian Weber Mauro Martin |
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Affiliation: | 1. Adam Opel AG, 65423 Ruesselsheim, Germany;2. Sandia National Laboratories, Livermore, CA 94550, USA;3. BMW AG, 80788 Munich, Germany;4. Helmholtz-Center Berlin for Materials and Energy GmbH, 14109 Berlin, Germany;5. Ruhr University Bochum, Institute for Materials, Chair of Materials Technology, 44780 Bochum, Germany |
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Abstract: | Seven stable austenitic steels (stable with respect to γ → α′ transformation at room temperature) of different alloy compositions (18Cr–12.5Ni, 18Cr–35Ni, 18Cr–8Ni–6Mn–0.25N, 0.6C–23Mn, 1.3C–12Mn, 1C–31Mn–9Al, 18Cr–19Mn–0.8N) were tensile tested in high-pressure hydrogen atmosphere to assess the role of austenite stability on hydrogen environment embrittlement (HEE). The influence of hydrogen on tensile ductility was small in steels that are believed to have a high initial portion of dislocation cross slip (18Cr–12.5Ni, 18Cr–35Ni, 18Cr–8Ni–6Mn–0.25N), while the effects of hydrogen were significantly greater in steels with other primary deformation modes (planar slip in 18Cr–19Mn–0.8N and 1C–31Mn–9Al or mechanical twinning in 0.6C–23Mn and 1.3C–12Mn) despite comparable austenite stability at the given test conditions. It appears that initial deformation mode is one important parameter controlling susceptibility to HEE and that martensitic transformation is not a sufficient explanation for HEE of austenitic steels. |
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Keywords: | Hydrogen environment embrittlement Austenitic stainless steel Martensitic transformation Incoloy DS TWIP Hadfield |
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