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

摘要

Dilatometry is often used to study the decomposition of austenite in steels, but the analysis of dilatometric data is often limited to the determination of transformation temperatures. The well-known lever rule is not applicable when more than one phase transformation occurs. A model accounting for the carbon partitioning effects was developed to extract the phase transformation 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 steels.