The invention discloses a method for realizing fine
crystal solidification by controlling spherical
crystal stabilization. A method of combining
oxide crucible, glass purifying, circulating and overheating, medium-frequency
electromagnetic induction is adopted under vacuum environment, so that melt which is circulated and overheated by multiple times is slowly cooled to the liquid-
phase line temperature. Temperature-equalizing and stirring are carried out by utilizing electromagnetic fields, so that temperature and solute of the whole melt are almost uniformly distributed, wherein the whole melt is enabled to be uniformly cooled integrally during the cooling process. According to the method disclosed by the invention, high-temperature
alloy fine-grained structure, which is free of a tricrystal region of the conventional solidified
ingot, small in microporosity, provided with fine equiaxed grains with grain size level of about ASTM (American Society for Testing Material) 5 level, small in microsegregation and high in density, can be obtained by the method disclosed by the invention. The grain size of the obtained fully equiaxed
ingot is close to that of the spherical
crystal and is very beneficial to the subsequent deformation, therefore, the billeting success rate of the high-temperature
alloy is effectively improved.