|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Interface-driven Phenomena in Solids: Thermodynamics, Kinetics and Chemistry
||The Role of Interfaces for Structural Transformations Among Austenite, Ferrite and Cementite in Fe-C Alloys
||Xie Zhang, Tilmann Hickel, Jutta Rogal, Joerg Neugebauer
|On-Site Speaker (Planned)
During the cooling process of Fe-C alloys a decomposition of the high-temperature austenitic phase into ferrite and cementite takes place. The atomistic modelling of the involved processes at the interface is challenged by the simultaneous changes in Fe lattice structure and redistribution of C to accommodate the reduced C solubility.
With a combination of the orientation relationships between austenite, ferrite and cementite, we identify an intermediate structure, which serves as a link between the three phases. It spatially extends over a few atomic layers and stabilizes the interfaces similar to complexions. Based on this framework, different mechanisms depending on the local conditions (C concentration, strain, magnetism) are revealed from ab initio nudged elastic band simulations, which allow us to construct a theory for the structural transformations among austenite, ferrite and cementite.
||Planned: A print-only volume