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Article Dans Une Revue Journal for Manufacturing Science and Production Année : 2015

Mathematical Modeling of the Mold Current and Its Influence on Slag and Ingot Behavior during ESR

Mathilde Hugo
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Alain Jardy
Bernard Dussoubs
Jessica Escaffre
  • Fonction : Auteur
Henri Poisson
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Résumé

ElectroSlag Remelting (ESR) is widely used to produce high added value alloys for critical applications (aerospace industry, nuclear plants, etc.). In collaboration with Aubert & Duval, Institut Jean Lamour has been developing for several years a numerical transient model of an ESR heat. In the previous version of the model, the crucible was assumed to be perfectly electrically insulated from the electrode-slag-ingot system. However, this assumption must be challenged: the solidified slag skin at the slag/mold and ingot/mold interfaces may actually allow a fraction of the melting current to reach the crucible. In this paper, an evolution of the model is presented that enabled us to take into account the possibility of mold current. The simulation results were compared with actual experimental data. Sensitivity studies showed the influence of slag properties and operating parameters on the final quality of the ingot. Results highlighted that even a weakly conductive solidified slag skin at the inner surface of the model can be responsible for a non-negligible amount of current circulating between the slag and crucible, which modifies the fluid flow, heat transfer and solidification of both the slag phase and the metallic ingot.
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Dates et versions

hal-01290823 , version 1 (18-03-2016)

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Mathilde Hugo, Alain Jardy, Bernard Dussoubs, Jessica Escaffre, Henri Poisson. Mathematical Modeling of the Mold Current and Its Influence on Slag and Ingot Behavior during ESR. Journal for Manufacturing Science and Production, 2015, 15 (1), pp.79-88. ⟨10.1515/jmsp-2014-0052⟩. ⟨hal-01290823⟩
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