|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Advanced High Strength Steels IV
||Austenitization of a Cold-rolled Dual-phase Steel: Interaction with Recrystallization and Influence of Cementite Composition
||Marc Moreno, Julien Teixeira, Sébastien Allain, Carla Oberbillig, Frédéric Bonnet
|On-Site Speaker (Planned)
The manufacturing of DP steels includes as a crucial step the annealing of a cold-rolled ferrite-pearlite microstructure, which involves recovery/recrystallization of ferrite, globularization, enrichment, coarsening of cementite and finally austenite transformation.
Present study focuses on the austenite transformation, emphasizing its interaction with the ferrite recrystallization and the influence of the chemical composition of cementite. A cold-rolled ferrite-pearlite steel is heated at 3, 30 or 100°C.s-1 in order to induce weak or strong interactions. Austenite transformation kinetics is determined in situ by synchrotron HEXRD, combined with post mortem SEM observations of the microstructure. Cementite compositions are measured by EDS in TEM.
Fast and slow heating lead to banded and necklace austenite morphology respectively, due to strong or weak interaction with recrystallization. Conversely, the austenite transformation kinetics is weakly influenced by the recrystallization or the cementite composition. Thermokinetic analysis of the austenite transformation (DICTRA simulations) is sufficient to interpret the transformation kinetics.
||Planned: Supplemental Proceedings volume