|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced High-Strength Steels
||An Interface Controlled Transformation Model Predicting the Kinetics for Isothermal Bainite Formation in Medium Mn Steels
||Hussein Farahani, Wei Xu, Sybrand van der Zwaag
|On-Site Speaker (Planned)
Following the previous TU Delft work on the effect of partitioning of alloying elements on the interface velocity for the austenite/ferrite and austenite/bainite transformations, a refined kinetic model for isothermal bainite transformation is presented. In the new model, the rate of heterogeneous nucleation of bainitic plates is calculated explicitly considering the effect of thermal treatment and alloy composition. The Gibbs Energy Balance (GEB) approach is used to incorporate the effect of interstitial (in particular C) and substituional (in particular Mn) alloying elements on the velocity of migrating austenite/ferrite interface. The model is coupled with numerical calculation of the distributions of alloying elements along the parent austenite phase at each time step. The new model allows prediction of the effect of alloying element partitioning on the morphology and the aspect ratio of bainitic plates. The results are compared to previous simulations and experiments and new metallurgical insights are presented.
||Planned: Supplemental Proceedings volume