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Etude et développement d'un système de contrôle volumique de la qualité cristalline des aubes de turbines.

Abstract : In the aerospace industry, single crystal nickel-based high pressure turbine blade are the most critical part of the engine. The objective of this study is to develop a new non-destructive testing based on Laue diffraction for the novel geometry of turbine blades. Diffraction is carried out in transmission mode to be able to irradiate the entire volume of the blade. First, an experimental setup has been constructed and tests under laboratory conditions using a conical x-ray source and 2-dimensions detector have been performed. Several x-ray systems have been tried in this work, in particular an hybrid photon counting detector. The setup comprises a 4 motorized slits, 2 translations stages for the sample and a beam-stop: the image acquisition can be carried out using the 7 motors composing the setup in order to automate the acquistion of scans. In the same time, a simulation forward model of the Laue diffraction physics has been developed. This forward model uses the Laue diffraction equations integrating a given incident beam and allows to simulate any diffraction pattern according to the crystal structure, the sample geometry and the setup geometry. An indexing algorithm program has also been developed to index the experimental patterns using the diffraction spot positions. Experiments were carried out on reference crystals, on blade sample pieces or directly on industrial turbine blades. The influence of the diffraction parameters has been studied. The results showed that the Laue transmission diffraction method makes it possible to carry out an orientation mapping for an extended monocrystalline volume. Indeed, Laue diffraction pattern analyse is able to reveal the potential presence of an undesirable grain. Moreover, the detailed analysis of the geometry of the spots can be used to reconstruct the microstructure of the illuminated volume implying the sub-grains boundary or the lattice curvature.
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Submitted on : Friday, February 18, 2022 - 12:15:11 PM
Last modification on : Sunday, February 20, 2022 - 3:11:53 AM
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  • HAL Id : tel-03579869, version 1


Alexiane Arnaud. Etude et développement d'un système de contrôle volumique de la qualité cristalline des aubes de turbines.. Matériaux. Université Paris sciences et lettres, 2020. Français. ⟨NNT : 2020UPSLM078⟩. ⟨tel-03579869⟩



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