About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Frontiers in Solidification X
|
| Presentation Title |
In-situ observation of microstructure evolution during solidification in Fe-Mn-C austenitic steels |
| Author(s) |
Taka Narumi, Kengo Fujita, Makoto Ohta, Ryoji Katsube, Hideyuki Yasuda |
| On-Site Speaker (Planned) |
Taka Narumi |
| Abstract Scope |
A series of time-resolved and in-situ observations were conducted to elucidate the mechanisms governing nucleation-controlled phase selection and subsequent microstructure evolution in Fe-22mass%Mn-0.7mass%C alloy during cooling from its melt. These observations were facilitated by the implementation of X-ray imaging techniques using synchrotron radiation X-rays, which provided comprehensive and quantitative insights into solidification phenomena in metallic materials. The observations indicated that metastable ferrite nucleation was preferably selected, and the ferrite massively transformed into the austenite in the solid state, despite the austenite being the primary phase in equilibrium. The ferrite-austenite transformation produced multiple austenite grain structure within a single ferrite grain. The coarsening of multiple austenite grains followed the ferrite-austenite transformation. The austenite grain size ranged from 100 to 500 micrometers. Consequently, the present results suggest that the ferrite-austenite transformation following metastable ferrite nucleation has the potential to control the austenite grain size in as-cast microstructures. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Solidification, Iron and Steel, Characterization |