| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Pearlite in Multicomponent Steels: Phenomenological Steady-state Modeling |
| Author(s) |
Jiayi Yan, John Ågren, Johan Jeppsson, Kaisheng Wu |
| On-Site Speaker (Planned) |
Kaisheng Wu |
| Abstract Scope |
A steady-state model for austenite-to-pearlite transformation in multicomponent steel is presented, including Fe, C, and eight more elements. The model considers classic ingredients but also finite austenite-pearlite interfacial mobility which resolves some previous difficulties. A transition between orthopearlite and parapearlite is realized by optimizing the partitioning of substitutional alloying elements under constrained carbon equilibrium between ferrite and cementite. Solute drag effect is included to account for the bay in growth rate curves. Grain boundary nucleation rate is modeled as a function of chemical composition, driving force, and temperature, with consideration of grain boundary equilibrium segregation. Overall transformation kinetics is obtained from growth rate and grain boundary nucleation rate, assuming pearlite colonies only nucleate on austenite grain boundaries. Further theoretical and experimental work are suggested for generalization and improvements. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |