Theoretical aspects of formation of macro- and microstructures during ingot solidification
A comparative analysis has been carried out of the regularities of characteristic isotherms movement speed in the axial zone of a cooling ingot (without phase transformation) and in the axial zone of a crystallizing ingot. The asymptotical expression of the isotherm movement speed near to the thermal center of the cooling ingot was obtained. It was shown how the speed of the isotherm movement influences the form of the "crater" in ingots of low-carbon and high-carbon crystallizing steels. Some theoretical aspects of the zone macrostructure that forms during the ingot solidification have been considered. Theoretical approaches to the description of the formation process of the first and second order dendritic axes have been analyzed.