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Abstract
Addition of Mn for preventing pearlite formation in austempered ductile iron causes intercellular segregation which may lead to precipitation of stable eutectic carbide. SEM-EDX and TEM-EDX were used to analyse chemical composition of this carbide in 1% Mn ductile iron. By assuming a model based on the solidification mechanism of ductile iron and using a segregation equation, a relation between nodule count and solidification time was derived to predict carbide precipitation. The experimental data shows good agreement with the calculated values. It was shown that the amount of carbide precipitation is a function of graphite nodule count and solidification time for a specified nominal Mn content.