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Article Dans Une Revue Journal of Materials Processing Technology Année : 2019

Investigation of arc dynamics during vacuum arc remelting of a Ti64 alloy using a photodiode based instrumentation

P Chapelle
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Alain Jardy
Julien Jourdan
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Yvon Millet
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Résumé

Understanding the arc dynamics during VAR is important for controlling the final quality of the ingot, as the spatial and temporal distribution of the arc dictates the electric current and energy inputs at the ingot top, which in turn affect the hydrodynamics of the metal in the molten pool and the solidification conditions of the ingot. The arc dynamics during vacuum arc remelting was quantitatively investigated based on the analysis of the light emitted by the arc and reflected by the molten pool using photodiodes placed inside a full-scale furnace. The measurements allowed us to determine the location of the arc luminosity centroid and to follow its displacement as a function of time. They were made during the melt of a Ti64 alloy with an imposed alternated electromagnetic stirring of high intensity. The arc dynamics was found to be most of the time periodic, asymmetrical, and strongly correlated to the evolution of the stirring magnetic field. The arc centroid exhibited three regular displacement patterns throughout the melt. A common characteristic to all three patterns was the relative stability of the centroid during stirring plateaus and its rapid motion during stirring ramps. An evolution towards a much more centered distribution of the centroid was observed with the arc power decrease during the hot-topping phase. Possible implications of the observed arc dynamics on the final quality of the VAR ingot are discussed.
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Dates et versions

hal-02106969 , version 1 (13-01-2022)

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Pierre-Olivier Delzant, P Chapelle, Alain Jardy, Julien Jourdan, Yvon Millet. Investigation of arc dynamics during vacuum arc remelting of a Ti64 alloy using a photodiode based instrumentation. Journal of Materials Processing Technology, 2019, 266, pp.10-18. ⟨10.1016/j.jmatprotec.2018.10.031⟩. ⟨hal-02106969⟩
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