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Modélisation du procédé de refusion sous laitier électroconducteur : représentation des transferts énergétiques métal-laitier

Abstract : The electroslag remelting process (ESR) is used to produce high added value alloys characterized by a higher metallurgical quality. These alloys are reserved for specific industries, such as aeronautics or energy. Numerical modeling of the ESR process is a tool-of-choice to gain a better understanding of the phenomena occurring during the remelting and optimize the operation. In order to improve a 2D axisymmetric model of the ESR process, previously developed at the Jean Lamour Institute in close collaboration with Aubert & Duval company, an accurate description of the metal transfers to the ingot via the liquid metal droplets has been developed. First of all, liquid metal droplets behavior has been investigated using a specifically developed 2D diphasic model of the slag bath. This model has been supported by 3D detailed simulations of dripping phenomena during electroslag remelting, performed at Montanuniversitaet Leoben (Austria). The influence of falling drops on the slag hydrodynamics, heat tranfer and electromagnetic phenomena has been highlighted. Afterwards, a simplified model of drops-slag interactions has been implemented into the global ESR model. The liquid metal transfer representation at the top of the ingot has then been enhanced, and considers the in-depth impact on the melt pool. The newly developed version of the global model has been validated by comparing results to industrial-sized remelted ingots. In order to discuss the relationship between power consumed and melt rate, a 1D thermal model of the consumable electrode has been set-up. The latter has been implemented into the global ESR model to estimate the melt rate. Finally, industrial-scale ingots have been specially remelted to study the influence of electrode immersion depth. Associating experimental observations and simulation results, three immersion regimes have been distinguished, especially regarding to the slag equivalent resistance. The impact of immersion depth on ingot solidification have been discussed.
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https://hal.univ-lorraine.fr/tel-03418711
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Submitted on : Monday, November 8, 2021 - 9:27:10 AM
Last modification on : Tuesday, November 9, 2021 - 4:05:12 AM

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  • HAL Id : tel-03418711, version 1

Citation

Jeremy Chaulet. Modélisation du procédé de refusion sous laitier électroconducteur : représentation des transferts énergétiques métal-laitier. Matériaux. Université de Lorraine, 2021. Français. ⟨NNT : 2021LORR0145⟩. ⟨tel-03418711⟩

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