Incremental solidification and forming

Abstract

A new concept in solidification and casting technology is outlined which relates powder metallurgy, spray forming, and conventional casting. It is shown that incremental solidification can he used to make products having enhanced properties. Rapid solidification, very low porosity, zero segregation, fine grain size, and uniform distribution of a second phase can be accomplished in various combinations though, regrettably, not all together. A terminology appropriate to the new concept has been developed together with certain definitions. Basic equations are proposed to describe a general model spray forming, from which solutions can be derived in particular practical cases.