Special features of cyrstallization of steels in the liquidus-solidus temperature range

Abstract

The process of crystallization of alloys of the type of bounded solid solutions occurs successively by two principally different mechanisms of growth of the solid phase. In the period of dendrite growth that ends with the formation of about 65% solid phase the change in the composition of the solid and liquid phases is adequately determined by the position of the equilibrium liquidus and solidus lines, and the amount of the phases is determined by the rule of the equilibrium lever. In the period of solidification of the interdendrite liquid the growth of the solid phase becomes layerwise, and the microsegregation of the components decreases markedly (Ki→1), which makes the equilibrium diagrams not quite informative for the prediction of the final stage of solidification of actual alloys.