Contribution à la modélisation du procédé de refusion sous laitier éléctroconducteur

Abstract : The ElectroSlag Remelting process (ESR) is widely used to produce high added value alloys for critical applications (aerospace industry, nuclear plants, etc.). Trial-and-error based approaches being expensive, numerical simulation is fundamental to improve the knowledge and the understanding of this complex process. The Institut Jean Lamour has been developing for several years a numerical code to simulate the melting of a consumable electrode, supposedly perfectly cylindrical, within a mold assumed to be perfectly electrically insulated from the electrode-slag-ingot system. Based on these assumptions, the 2-D axisymmetrical transient-state numerical model accounts for electromagnetic phenomena and coupled heat and momentum transfers, to simulate the continuous growth of the electroslag remelted ingot and the solidification of the metal and slag. Recent studies on the ESR process are challenging the insulated mold hypothesis. Therefore, the main objective of the thesis is to acknowledge and study the existence of a mold current during an ESR remelting. A first model has been set-up, aimed to simulate the electromagnetic phenomena in the whole system for a simplified geometry. The possibility of the existence of such a mold current was confirmed. Based on this work, a fully-coupled model has then been developed and the results have been compared with experimental data to check the validity of the modifications. The influence of slag properties and operating parameters on the final quality of the ingot has been tested.
Document type :
Theses
File URL :
http://docnum.univ-lorraine.fr/prive/DDOC_T_2014_0091_HUGO.pdf
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https://hal.univ-lorraine.fr/tel-01750944
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Submitted on : Thursday, March 29, 2018 - 12:59:08 PM
Last modification on : Wednesday, September 4, 2019 - 2:06:03 PM

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  • HAL Id : tel-01750944, version 1

Citation

Mathilde Hugo. Contribution à la modélisation du procédé de refusion sous laitier éléctroconducteur. Autre. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0091⟩. ⟨tel-01750944⟩

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