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Comparaison des caractéristiques microstructurales et des propriétés en fluage de superalliages monocristallins à base de nickel de différentes générations

Abstract : Single-crystal nickel-based superalloys have been developed in order to increase the resistance of aeronautic turbine blades to high temperatures and stresses to improve their efficiency. The objective of this study is to increase knowledges about the role of the various alloying elements on microstructural stability and creep properties. Based on these considerations, chemical composition criteria can be established to meet to the next requirements for thermomechanical resistance in service.Five industrialized superalloys with different chemical compositions (from the first to the third generation) were tested: AM1, René N5, CMSX-4, CMSX-4 Plus et CMSX-10K. Temperatures of the creep tests have been chosen to cover the entire range of service temperature of these alloys. A detailed comparison has been performed, based on the microstructural evolutions and the deformation mechanisms occurring during these tests at various temperatures and under various stresses.The study focused on the analysis of the CMSX-4 Plus, a third-generation alloy which has been recently developed, and which shows remarkable high-temperature creep properties.We focused on:-the optimization of the heat treatment parameters for this alloy;-the analysis of the effect of the primary crystal misorientation on its creep resistance at low temperature and high stress;-the analysis of the evolution of γ' precipitates rafting, the formation of the dislocation network as well as the precipitation of TCP phases during creep at high temperature.
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Vincent Huleux. Comparaison des caractéristiques microstructurales et des propriétés en fluage de superalliages monocristallins à base de nickel de différentes générations. Matériaux. Université Paris sciences et lettres, 2019. Français. ⟨NNT : 2019PSLEM027⟩. ⟨tel-02466605⟩

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