An improved method for determining the continuous cooling transformation diagram of C-Mn steels

Dilatometry is often used to study the decomposition of austenite in steels , but the analysis of dilatometric data is often limited to the determinati on of transformation temperatures. The well-known lever rule is not applica ble when more than one phase transformation occurs. A model accounting for the carbon partitioning effects was developed to extract the phase transfor mation kinetics of a C-Mn steel cooled using a wide range of cooling rates. The model is shown to be suitable to analyze the phase transformations in C-Mn steels and it can be used to obtain a detailed CCT diagram for those s teels.