a method for making an equiaxed investment casting . the method utilizes an ultrasonic generator to send an ultrasonic pulse into molten metal in an investment casting mold . the investment casting mold is positioned within a working zone of furnace having low output induction coils for generating a convection current in molten metal . the ultrasonic pulse separates dendrites growing from the face of the mold inward into the molten metal . instead , equiaxed grains can nucleate within the molten metal . in addition , the ultrasonic pulse and the low output induction coils circulate the molten metal as solute is rejected from solidifying equiaxed grains . the mixing reduces the effects of segregation in the solidifying alloy and assists in nucleating equiaxed grains .