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Effet de la présence d'inclusions d'oxyde sur la prévision de l'amorçage de la corrosion sous contrainte de l'alliage 600 en milieu REP

Abstract : Nickel base alloy 600 contains 16 wt% chromium. It is susceptible to Stress Corrosion Cracking (SCC) when exposed to primary water environment. A predictive model of SCC (the 'local' model) has been developed in the past. It describes the phenomenology of cracking through an incubation stage (oxidation of grainboundaries), initiation (oxidized grain boundary failure) and then crack propagation. It is based on several parameters related to the environmental (temperature, dissolved hydrogen content), the microstructure (intergranular chromium carbides) and the mechanical state (work hardening, stress). However, the variables specific to industrial surface conditions such as the presence of oxide inclusions are not considered. This work focuses on the evolution of this model by studying the oxidation and SCC behaviors of models A600 that contain oxide inclusions of type Al2O3, MgAl2O4 and MgO and exposed to simulated primary water environment. Thus, characterizations of the initial microstructure were performed. Then, the oxidation behavior of these materials was established with a particular focus on the oxide inclusions. Grain boundary oxidation kinetics as well as oxide inclusion corrosion kinetics were identified. Finally, SCC tests have been performed on U-Bend type specimens and a SCC cracking criterion for grain boundaries that intercept oxide inclusions has been discussed.
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Submitted on : Monday, June 20, 2022 - 12:06:26 PM
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  • HAL Id : tel-03699531, version 1

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Colette Perez. Effet de la présence d'inclusions d'oxyde sur la prévision de l'amorçage de la corrosion sous contrainte de l'alliage 600 en milieu REP. Matériaux. Université Paris sciences et lettres, 2022. Français. ⟨NNT : 2022UPSLM007⟩. ⟨tel-03699531⟩

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