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This study deals with the solidi® cation and microsegregation processes of near eutectic ductile cast iron. A detailed analysis of old and new solidi® cation models was made. Metallographic techniques, developed elsewhere by the authors, were used to reveal the solidi® cation microstructure and macrostructure. The results allow a new soli-di® cation model to be proposed, where each solidi® cation unit is a grain of eutectic austenite that has a dendritic substructure and contains a very large number of graphite nodules. A pattern of microsegregation exists inside each solidi® cation grain, while no intergranular microsegregation has been detected. A procedure to characterise the solidi® cation re® nement was developed considering the location of the last to freeze areas.MST/5169