METHOD OF AND DEVICE FOR CASTING CAST PIECE OR INGOT HAVING FINE SOLIDIFICATION STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a method of and a device for casting a cast piece or ingot having a fine solidification structure by using an electromagnetic force. SOLUTION: A static magnetic field having a prescribed intensity, preferably 0.1 T or more is applied to a molten metal, and then an alternate magnetic field which generates an electric current component of the direction perpendicular to that of the static magnetic field in a region exceeding a prescribed distance (δ) from a solid-liquid interface toward a solidification direction, is applied. The alternate magnetic field is formed by applying an alternating current having a frequency of 10 Hz or more to at least a pair of coils. In this case, the distance (δ) satisfies the formula, δ=4.v1/3 [wherein, (v) is a solidification velocity (mm/min)].