| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability in Extreme Environments II
|
| Presentation Title |
Development of Novel Intermetallic Dispersion Strengthened Steels |
| Author(s) |
Iris Carneiro, Alexander J. Knowles |
| On-Site Speaker (Planned) |
Iris Carneiro |
| Abstract Scope |
With the need to increase the efficiency of high-demanding industries, such as aerospace and nuclear, including supercritical -H2O and -CO2 turbine cycles, there is a desire to develop materials that operate at higher temperatures in ever more extreme environments.
To meet these challenges, ferritic superalloys are strengthened through intermetallic precipitation towards operation at 600-800°C. Besides the high hardness and strengthening of these particles by inhibiting dislocation movement, even under high temperatures, they can also prevent grain growth by pinning grain boundaries.
The goal was to design and optimize composition and thermomechanical conditions to obtain novel ferritic superalloys reinforced by intermetallics. Alloy design and phase prediction were carried out on CALPHAD, produced by arc-melting, followed by a combination of thermomechanical deformation and heat treatments. Characterisation was performed using EBSD, EDX and XRD techniques. Intermetallics, as Heusler (L21) and the recently reported π-ferrosilicide were observed in the microstructure, successfully reinforcing these alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Nuclear Materials, Iron and Steel |