To understand the role of nickel in austenitic stainless steels, six heats were produced from one nominal composition differing in the nickel content between 9 % and 13 %. To characterize the material behavior in hydrogen gas atmosphere at 10 MPa, tensile and fatigue testing was conducted at ambient temperature and at 223 K. The susceptibility to hydrogen embrittlement clearly decreases with increasing nickel content both at ambient temperature and at 223 K. But at low temperature the relative reduction of area is less and thus hydrogen embrittlement is intensified. Fatigue tests confirmed these results as the reduction of the fatigue life is strongly dependent on the nickel content and the temperature. The influence of the test frequency was investigated at 4 different frequency levels. A low frequency slightly increases the susceptibility to hydrogen embrittlement. To gain a better understanding of hydrogen embrittlement and its influences the crack growth behavior was analyzed in detail.
Tensile and Fatigue Behavior of an Austenitic Stainless CrNi-Steel at 10 MPa Hydrogen Gas Atmosphere
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Schwarz, M, Sattler, E, Zickler, S, & Weihe, S. "Tensile and Fatigue Behavior of an Austenitic Stainless CrNi-Steel at 10 MPa Hydrogen Gas Atmosphere." Proceedings of the ASME 2017 Pressure Vessels and Piping Conference. Volume 6B: Materials and Fabrication. Waikoloa, Hawaii, USA. July 16–20, 2017. V06BT06A045. ASME. https://doi.org/10.1115/PVP2017-65988
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