Abstract
The general aim of this series of three papers is to build a useful tool to predict microstructures and microsegregations which develop during solidification of spheroidal graphite cast irons (SGI). Input data for such a model should be the melt composition and preparation (inoculation treatment), and the casting and cooling conditions. The first two papers focused on phenomena and results involved when segregation of alloying elements other than carbon, such as silicon, could be ignored; solidification in the stable system moreover, only was considered. The present paper is intended to broaden the field of application of the model published previously to account for the main effects of redistribution of substitutional species on the solidification behavior of SGI and on the final microsegregation in as-cast condition. The possibility for metastable eutectic to nucleate and grow is also accounted for. The basic set of mass balance equations is presented and microsegregation of silicon is studied in detail. The effects of the various casting variables on the competition between stable and metastable eutectic solidification of SGI are quantified.
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