Mathematical modeling of centrifugal casting of metal matrix composites

Centrifugal casting of Aluminum melts containing suspended ceramic particles has been studied. One dimensional heat transfer model coupled with equations for force balance on particles is formulated and analysed to predict the particles distribution in the casting region, the temperature distribution in the casting and mold regions, and solidification time of the casting. The model takes into consideration propagation of solid-liquid interface and movement of particles due to centrifugal acceleration. The solution of the model equations has been obtained by pure implicit finite difference technique with modified variable time step approach. The effect of various parameters like particle size, mold rotational speed, relative density difference between melt and particle, etc. on segregation of particles and solidification time have been examined. For a given set of operating conditions, the thickness of the particle rich region decreases with increase in rotational speed of the mold, particle size, relative density difference between the particle and melt, and the melt superheat. Solidification time increases as the heat transfer coefficient at the metal-mold interface decreases.