Multivariant Method of Conductive Electric Current Treatment of Molten Metal

Abstract

The prospects of utilizing electric current treatment of molten metal simultaneously with multiple types of current in foundry production were studied. This principle in combination with various designs of electrode systems allows the formation of a multivariant topology of the electromagnetic field in the molten metal, qualitatively and quantitatively shaping differently the thermomechanical load on the melt. Conditions for improving the performance of the cast metal were found. Simulation modeling methods identified treatment options capable of actively improving the incubation processes of crystallization. The results of simulation modeling were experimentally confirmed. It was determined that simultaneous treatment with two types of current at energy consumption three times lower than that in treatment with a single current source increases the tensile strength by 13% and the relative elongation by a factor of 1.5. The relative narrowing of the specimen was 4.4%, which cannot be achieved for an alloy in the Al–Si system by other treatment methods. The eutectic structure was modified, and α-Al grains acquired a rounded shape.