| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Thermodynamics and Kinetics of Alloys III
|
| Presentation Title |
Thermodynamic assessment of the fcc/hcp transformation in Fe-Mn alloys |
| Author(s) |
Julian Rackwitz, Gregory Olson |
| On-Site Speaker (Planned) |
Julian Rackwitz |
| Abstract Scope |
Most of the kinetically relevant phase transformations are diffusion-limited, leading thermodynamic descriptions within the CALPHAD framework to usually focus on temperature regimes well above room temperature. While working reasonably well for predicting phase diagrams at those elevated temperatures, some currently implemented descriptions violate the third law of thermodynamics at the low-temperature end. However, sufficiently high cooling rates can trigger a spontaneous diffusionless martensitic transformation at lower temperatures, which can significantly alter the mechanical behavior of materials. Ultimately, a thermodynamic description of the alloy system accurate down to low temperatures is needed. Here, we focus on assessing the binary Fe-Mn system that complies with the third law of thermodynamics. The resulting chemical driving force and experimental data on transformation temperatures are utilized to fit the binary interaction parameters. Based on this newly implemented thermodynamic assessment, the composition-dependent austenite stability parameter is calculated and discussed in the example of high-damping Fe-Mn alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Phase Transformations, Modeling and Simulation |