A multi-scale 3D model of the vacuum arc remelting process
Pericleous, Kyriacos, Djambazov, Georgi, Yuan, Lang, Ward, Mark and Lee, Peter D. (2012) A multi-scale 3D model of the vacuum arc remelting process. In: 2012 TMS Supplemental Proceedings: Materials Properties, Characterization, and Modeling. J. Wiley & Sons Inc, USA, pp. 291-298. ISBN 978-1-11829-609-7Full text not available from this repository.
A multi-scale model of the VAR process was developed to simulate unsteady phenomena within the ingot melt pool due to arc motion and the resulting effects on dendritic microstructure. External magnetic field and surface current measurements were used as boundary conditions, to determine the trajectory of the arcs between electrode and ingot and between ingot and sidewalls. The interactions between magnetic field, turbulent metal flow and heat transfer were modeled using CFD techniques and this "macro" model was linked to a micro model, to resolve the evolving dendritic microstructure, and to establish a relationship between operational parameters and microstructure defects. Arc-driven solute convection in the mushy zone leading to local remelting and changes in local Rayleigh number provided an indicator of when fluid flow channels (freckles) will initiate within the mushy zone. Particle tracking was further used, to characterize the trajectory and dissolution of inclusions entering the melt, causing "white spot" defects.
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