|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||High Performance Steels
||Numerical Investigations of Interface-controlled Phase Transformations during Intercritical Annealing of DP Steels
||Clelia Couchet, Julien Teixeira, Sébastien Allain, Guillaume Geandier, Frédéric Bonnet
|On-Site Speaker (Planned)
Austenite formation kinetics during intercritical annealing of various steels have been simulated using DICTRA/Thermo-Calc software. Carbide dissolution, austenite islands growth and interaction were investigated in a ternary Fe-C-Mn considering several geometries inspired by our SEM studies. The interface conditions were studied in multi-constituent systems (up to quinary). In particular, carbides were found to dissolve rapidly at the Partition-No partition Transition Temperature (PNTT). A regime transition from No Partitioning Local Equilibrium (NPLE) to Partitioning Local Equilibrium (PLE) occurs at the beginning of the holding stage. Austenite formation kinetics was found to be highly sensitive to substitutional partitioning during the holding stage. By considering silicon in simulations, silicon partitioning in ferrite strongly slows the austenite formation kinetics, making the simulated austenite fraction closer to the fraction determined from High Energy X-Ray Diffraction experiments.
||Phase Transformations, Modeling and Simulation,