On the role of nitrogen on hydrogen environment embrittlement of high-interstitial austenitic CrMnC(N) steels |
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| Affiliation: | 1. Ruhr-Universität Bochum, Institut für Werkstoffe, Lehrstuhl Werkstofftechnik, 44780, Bochum, Germany;2. Bergische Universität Wuppertal, Lehrstuhl für Neue Fertigungstechnologien und Werkstoffe, 42651 Solingen, Germany;1. Pontifical Catholic University of Minas Gerais, Department of Mechanical Engineering, Av. Dom José Gaspar 500, 30535-901, Belo Horizonte, (MG), Brazil;2. Federal Center for Technological Education of Minas Gerais, Av. Amazonas 5253, 30421-169, Belo Horizonte, (MG), Brazil;1. High Temperature Energy Materials Research Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea;2. Department of Advanced Metallic Materials, Korea Institute of Materials Science, Changwon, Gyeongnam, 642-831, Republic of Korea;1. Institute of Material Forming and Control Engineering, Zhejiang University of Technology, Hangzhou 310014, China;2. National Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan;3. Institute of Process Equipment, Zhejiang University, Hangzhou 310027, China;1. Graduate Institute of Ferrous Technology, POSTECH, 77 Cheongam, 37673 Pohang, Republic of Korea;2. Technical Research Laboratories, POSCO, 37859 Pohang, Republic of Korea;1. Graduate Institute of Ferrous Technology, POSTECH, 37673 Pohang, Republic of Korea;2. School of Materials Science and Engineering, Institute of Materials Technology, Yeungnam University, 38541 Gyeongsan, Republic of Korea;3. Technical Research Laboratories, POSCO, 37859 Pohang, Republic of Korea |
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| Abstract: | This work investigates the susceptibility of high-interstitial CrMn austenitic stainless steel CN0.96 to hydrogen environment embrittlement. In this context, an N-free model alloy of CN0.96 steel was designed, produced, and characterized. Both steels were subjected to tensile tests in air and in a high-pressure hydrogen gas atmosphere.Both steels undergo severe hydrogen embrittlement. The CN0.96 steel shows trans- and intergranular failure in hydrogen, whereas the N-free model alloy shows exclusively intergranular failure. The different failure modes could be related to different deformation modes that are induced by the presence or absence of N, respectively. In the CN0.96 steel, N promotes planar dislocation slip. Due to the absence of N in the model alloy, localized slip is less pronounced and mechanical twinning is a more preferred deformation mechanism. The embrittlement of the model alloy could therefore be related to mechanisms that are known from hydrogen embrittlement of twinning-induced plasticity steels. |
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| Keywords: | Hydrogen environment embrittlement Stable austenitic stainless steel High-manganese steel High-interstitial steel Nitrogen effect Deformation modes |
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