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Prévision des propriétés mécaniques de superalliages base nickel en relation avec leur microstructure granulaire de précipitation

Abstract : Constitutive modelling is employed by engine designers to predict stresses and strains in turbine engine components, to support life prediction. Current models used in industry are mainly empirical: they are essentially developed from simple curve fits of test data and macroscopic continuum mechanical models, whose parameters need to be identified for each superalloy according to its microstructure heterogeneities (precipitates distribution, grain size). In this context, we developed a first simulation tool, for the mechanical behavior of polycrystalline microstructures, sensitive to the local microstructural parameters. A complete process has been set up, starting from the design and production of the chosen microstructures, carrying out the experimental characterization of the microstructural influence on the mechanical behavior and developing the modeling and simulation tools in synergy with the experimental tests. The mechanical tests were performed at different temperatures and on single-crystals and polycrystalline specimens. The original use of single-crystals for the characterization of the behavior of polycrystalline aggregates allowed to isolate the contribution of precipitates. The experimental results allowed the identification of the parameters of the existing models in the literature for the prediction of the influence of solid solution elements, grain size and precipitates distribution. The discrepancy between the prediction of the precipitates hardening and the corresponding measured values led to propose a reformulation of an existing model. The analytical models were exploited to introduce the sensitivity to the local microstructure in a full field crystal plasticity simulation approach (based on the finite element method). Finally, a first application to microstructures with microstructural gradient (in terms of grains size) is proposed. This work constitutes a first step for future developments concerning the investigation of other characteristics of microstructure behavior (creep, fatigue...)
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Submitted on : Monday, December 13, 2021 - 3:42:30 PM
Last modification on : Sunday, June 26, 2022 - 3:24:54 AM
Long-term archiving on: : Monday, March 14, 2022 - 7:15:49 PM


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  • HAL Id : tel-03477822, version 1



Marco Panella. Prévision des propriétés mécaniques de superalliages base nickel en relation avec leur microstructure granulaire de précipitation. Autre. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2021. Français. ⟨NNT : 2021ESMA0008⟩. ⟨tel-03477822⟩



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