Dryomov V. Features of motion of a solidification front of a physically influenced flat ingot

The object of research of this work is thermo physical and hydrodynamic processes of solidification of metals in wedge shaped mould and ingots. The purpose of research is finding the analytical solution of non-stationary two-dimensional problems of flat ingot solidification under internal and external factors. Theoretical and practical results of the suggested mathematical model of the process of solidification allows realizing technology process control, which improves efficiency of production as well as ingot quality. For the first time it is shown that velocity of solidification can be controlled by modifying current density from 0 to 50 A/cm2. Material, shape and specifications were developed for electrodes submerging into liquid steel to create elastic waves. Novelty of this work is new mathematical model as well as theoretical-experimental approximation to solve non-stationary problems of heat and mass transfer with non-stationary boundary conditions characterizing speed of ingot cooling. Applied method of local thermodynamic potential and variation analysis to non-stationary two-dimensional problems of solidification of metals in wedge shaped mould with direct and reverse conicity helps to understand dynamics of ingot solidification. Research of two-dimensional convection in liquid phase and its influence on ingot solidification allowed for the first time to analytically determine time of structural zones forming in solidified ingot. Velocity of solidification was calculated for these zones. Degree of implementation. Results of this work were implemented in the foundry of Zuevskij electromechanical plant and used in student education process in Donetsk National University and Donbass National Academy of Civil Engineering and Architecture. Region of interest - metallurgical industry.