Influence of copper, Tin and Manganese on Ferrite Formation In Ductile Iron: Experiments, Models and Simulation

摘要

The mechanisms of structure formation in ductile iron have been examined by experimetns and by physical modeling. By coupling models for nucleation and growth for all relevant phases with a heat flow calculation, it is possible to predict the as-cast structure by computer simulation. This work has focused on the eutectoid transformation and especially on the influence of Cu, sn and Mn on the ferrite growht. From experimental observations, it was concluded that a pure diffusion model was not sufficient to describe the transformation rate of austenite into ferrite and graphite as previously proposed in the literature. By introducing an interfacial mass trnasfer resistance at the graphite/ferrite interface, to ocntrol the incorporation rate of carbon atoms on the grpahite nodules, it is possible to reproduce the ferrite growth experimentally observed by numerical simulation.