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Vers une maîtrise de la réparation par le procédé CLAD de pièces aéronautiques en Inconel 738 LC : compréhension des mécanismes de fissuration et modélisations associées

Abstract : Y' hardened nickel-based superalloys, such as Inconel 738 LC (IN738LC), are materials which are extensively used in hot sections parts of helicopter and aircraft engines. Those materials exhibit enhanced mechanical properties at high temperature. Nevertheless, cracking and several defects can occur on these parts during casting or during their service life. However, welding type repairing processes can lead to considerable cracking of IN738LC superalloy. It appears that laser cladding is a promising additive manufacturing technology which allows the repair of damaged parts. The present work main objective is aimed at investigating Inconel 738 LC repair by laser cladding. Both experimental and numerical aspects are studied for the repair of IN738LC by means of the CLAD process. Experimental laser clad deposits are produced under several configurations following industrial cases. Two distinct cracking mechanisms are identified in the heat-affected zone and within the deposit, respectively. A multi-physics simulation of laser cladding is developed in order to take into account thermal, mechanical and metallurgical phenomena. Simulation is compared to experimental measurements for validation. Finally, these numerical tools are used to define cracking risk criteria. In summary, a high preheating of the samples allows to suppress liquation and HAZ cracking, but also to obtain un-cracked deposit, which indicates that the repair of non-weldable alloys is possible.
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https://hal.univ-lorraine.fr/tel-02397949
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Submitted on : Friday, December 6, 2019 - 5:48:07 PM
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  • HAL Id : tel-02397949, version 1

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Anis Doghri. Vers une maîtrise de la réparation par le procédé CLAD de pièces aéronautiques en Inconel 738 LC : compréhension des mécanismes de fissuration et modélisations associées. Science des matériaux [cond-mat.mtrl-sci]. Université de Lorraine, 2019. Français. ⟨NNT : 2019LORR0112⟩. ⟨tel-02397949⟩

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