Modelling the formation of austenite in the intercritical interval in ductile iron

In this work, the formation of austenite in intercritical interval under continuous heating and isothermal holding ductile iron with various chemistries was investigated using high-resolution dilatometry quantitative metallographic analysis. The study conducted fully ferritic pearlitic matrices as initial microstructures. Subsequently, a mathematical model based on Avrami's equation, that describes at range, proposed adjusted to experimental data. results show range is faster happens lower temperatures when microstructure pearlitic. Additionally, kinetic did not change by adding Cu it accelerated Ni alloy. Finally, equation allowed followed good adjustment data, which contributes understanding range.