Comportement des oxydes dans un procédé de fonderie d'alliages base nickel

Abstract : The presence of oxide inclusions within single-crystal turbine blade high pressure in AM1 involves the germination of parasite grains succeeding the critical reduction of their mechanical performances. In order to evaluate the cleanliness of material AM1 and to follow its evolution during various stages of the process foundry (VIM), an experimental and a numerical study were carried out. The experimental part consists in following the evolution of the inclusion population of the raw material until the liquid bath by combining visualizations of the surface of the liquid bath and the application of the electron beam button melting test on a set of material extracted during the process of foundry. The results highlight a modification of the major inclusion population during the process and a regular supply of particles within the liquid bath which come from the crucible. The digital part is based on a set of three models allowing the modeling of the electromagnetic, hydrodynamic phenomena and the trajectory calculation of the particles within the liquid bath. The value of the intensity of the electric current was given from a calibration of the electromagnetic model based to experimental measures of the axial magnetic induction within the industrial furnace. For the whole of the mathematical models, the surface of the liquid bath selected is deformed and non-evolutive. The model of trajectory calculation is based on a Lagrangian approach by taking account of the turbulence of the flow. The digital results show a good agreement with in experiments released tendencies
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Benoit Defay. Comportement des oxydes dans un procédé de fonderie d'alliages base nickel. Alimentation et Nutrition. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0298⟩. ⟨tel-01749471⟩

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