| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments II
|
| Presentation Title |
Nano-structured Cr-superalloys in Advanced Concentrated Solar Plant Environments |
| Author(s) |
Kan Ma, Thomas Blackburn, Michael Kerbstadt, Rebeca Hernández, Elvira Onorbe, Marta Navas, Tatu Pinomaa, Emma White, Mathias Galetz, Alexander Knowles |
| On-Site Speaker (Planned) |
Kan Ma |
| Abstract Scope |
Advanced concentrated solar power (CSP) seeks novel high-performance materials for applications in high-pressure (25 MPa) and high-temperature (>750 °C) supercritical CO2 environments. Compared to state-of-the-art nickel superalloys and steels, chromium alloys offer high melting points, low costs and good oxidation resistance. However, there remain challenges in improving their high-temperature strength and low-temperature toughness. This work follows a ‘bcc-superalloy’ alloy design concept using ordered-bcc B2-NiAl intermetallic precipitates to strengthen a bcc A2-Cr matrix, leading to Cr-based bcc-superalloys. Heat treatments, hot compressions, high-temperature erosion testing and oxidation experiments were performed to investigate the properties and behaviour of Cr-superalloys in advanced CSP environments. Microstructure was characterised by electron microscopy. Results show the advantageous stability of the A2+B2 microstructure compared to advanced steels and nickel-based superalloys, and show high compressive yield strength of ~320 MPa at 1000 °C. Results including onwards erosion and oxidation experiments at high temperatures (700-1200°C) will be presented and discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Characterization, Environmental Effects |