Strain rate and oxidation effects on crack initiation at 600 and 650 °C in a nickel-based superalloy

Abstract : Nickel-based superalloys are sensitive to an oxidation-assisted intergranular crack (OAIC) growth mechanism. Crack initiation during slow strain rate tensile tests is investigated at 600 and 650 °C, at different strain rates, with or without oxidation on a direct-aged material. A V-shaped sample geometry is used to promote damage initiation for a specific stress triaxiality. The critical mechanical loading paths inducing intergranular crack initiation as well as the effect of oxidation are discussed.
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Maxime Perrais, Alexandre Seror, A. Burteau, Eric Andrieu, Dominique Poquillon. Strain rate and oxidation effects on crack initiation at 600 and 650 °C in a nickel-based superalloy. Materials at High Temperatures, Taylor and Francis, 2016, 33 (3), pp.241-247. ⟨10.1080/09603409.2016.1169665⟩. ⟨hal-01755241⟩

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