|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Direct Observation of the Movement of the Austenite-ferrite Interface in Fe-C-Mn Steels
||William Mark Rainforth, John Nutter
|On-Site Speaker (Planned)
The transformation from austenite to ferrite is a key process in determining the final microstructure and properties of steels. The transformation is sensitive to both cooling rates and composition. Typically models of this transformation make assumptions about the material and the structure and motion of the interface. Using in situ hot stage transmission electron microscopy it is possible to directly observe the motion of the austenite-ferrite interface during transformations. Observed interfaces migrated with fluctuations in velocity but reasonable agreement with expectations. Interactions occurred between microstructural features including existing grain boundaries as well as other growing grains. By cycling the temperature within the two-phase region, the motion of the interface can be reversed. These interfaces do not show perfect reversibility, but can be used to examine the effect of changes in local chemistry caused by the partially complete transformation. How these observations can contribute towards refining existing models is discussed.
||Planned: Supplemental Proceedings volume