|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Impact of Solute Segregation on Phase Transformations during Cooling and Austempering of Direct-strip-cast High Strength Bainitic Steels
||Jerome Daniel Cornu, Thomas Dorin, Peter Hodgson
|On-Site Speaker (Planned)
||Jerome Daniel Cornu
Direct strip casting (DSC) is an innovative near-net-shape process for the formation of thin steel sheets which drastically simplifies the conventional process, allowing significant energy savings. Materials produced by DSC undergo extreme cooling rates, resulting in highly out-of-equilibrium conditions of solidifications and phase transformations. The current challenge is to be able to predict the final microstructure under such processing conditions.
Among other features, micro-segregation is part of the strip-cast microstructure. The aim of this work is to understand the effect of such segregation on the kinetics of phase formation (bainite, pearlite) in medium to high carbon bainitic steels. Continuous cooling and isothermal treatments were performed on alloys with various carbon, silicon and chromium contents, produced both by DSC and conventional casting. CCT diagrams of the various alloys were obtained by dilatometry, and the microstructures characterized by electron microscopy. Finally, Thermocalc was used to understand the thermodynamic effect of the micro-segregation.
||Planned: Supplemental Proceedings volume