METHOD FOR HOMOGENIZING MELTS BY MEANS OF CYCLICAL PHASE TRANSFORMATIONS AND A DEVICE FOR IMPLEMENTING SAME

摘要

The invention relates to metallurgy. A melt is heated to a superheating temperature above the liquidus line and is poured into a lined and heated mould. As the bulk of the melt cools, the induced crystallization of the melt is carried out in a force field generated by ultrasonic emitters. The onset of crystallization is induced in the central region of the melt with the crystallization front spreading towards the periphery of the melt. After solidification, the billets are heated until they are completely melted, heating is discontinued and the natural crystallization of the melt is carried out so that the crystallization front spreads from the wall of the crystallizer to the centre of the melt. The processes of induced and natural crystallization and melting are periodically repeated as many times as is required for the ingredients in the billet to reach the desired degree of homogeneity. The point of completion of a phase transition is recorded by an ultrasonic measuring system. The heater and the ultrasonic emitters are switched on and off by a control unit comprising a temperature sensor and a sensor of the phase state of the melt. The result is an increase in the degree of homogenization.