An original microsegregation model taking into account non-metallic inclusions precipitation during solidification has been developped at IRSID. The microsegregation equations and the equilibrium conditions between liquid steel and non-metallic inclusions are combined in a general multiphase equilibrium code. Computed results agree with the microsegregation of alloying elements measured in several unidirectionally solidified plate and high carbon steels. Composition and area fraction of sulphides measured by image analyses in unidirectionally solidified high-carbon steels are also accurately predicted with the model.
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