Modeling of the dendrite arms behavior during solidification

Modelling was carried out to investigate the internal dendrite grains structure formation from a liquid two-component solution. For the simulation, our own model and computer program based on CAFD (Cellular Automata - Finite Differences) were used. In modelling, the effect of process conditions and material-related parameters on the nature of the dendritic grain growth was examined. It was demonstrated that increase of the secondary dendrite arm space may by a result of interruption of the arms growth as well as of overgrowing of concave regions. A local melting down of the grains of a solid phase due to the segregation of admixtures reducing the alloy point of liquidus is also possible.