Abstract
Solidification mechanism relating to fully equiaxed castngs of Ni-Cr alloy in dental-centrifugal casting process was qualitatively discussed. The subsequent results were obtained by performance of some experiments. Crystal grains locating at direction of centrifugal force in ingot after solidification were finer, they being just below sprue were fine with enlarging its diameter, they accumulated on the ledge setting in the mold cavity, and so forth. These results may be caused by which mechanical or thermal convection makes crystals separate from mold wall and then centrifugal force makes them move among the liquid and accumulate on the bottom. In particular, accumulation and packing of crystal grains make alloy in or near sprue solidificate. The discussion of the present paper may point out a number of unresolved areas which should stimulate future work.
