About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Materials for Energy Conversion and Storage 2023
|
Presentation Title |
D-7: Mechanical Testing of Novel Chromium Superalloys Strengthened by Intermetallic Precipitates |
Author(s) |
Tom Blackburn, Kan Ma, Rebeca Hernandez, Marta Serrano, Alexander Knowles |
On-Site Speaker (Planned) |
Tom Blackburn |
Abstract Scope |
Next-generation Concentrated Solar Power (CSP) concepts seek the improved thermal efficiencies offered by supercritical CO2 Brayton cycles >700oC, but these push beyond the capabilities of state-of-the-art superalloys. Novel chromium (Cr) based superalloys are considered as an attractive candidate with their high melting point, low cost, and oxidation/corrosion resistance. However, chromium and its alloys are currently limited due to their poor room temperature mechanical properties. This work develops novel Cr-based superalloys, where the bcc chromium matrix is strengthened by ordered-bcc NiAl intermetallic precipitates, alongside other alloying additions. Alloys have been designed using CALPHAD methods and microstructures characterised using electron microscopy and atom probe tomography. Advanced mechanical test, including small punch, have been performed to investigate the hardness, strength at high temperatures, ductile-brittle transition temperature (DBTT) and creep resistance of the developed alloys, benchmarked against state-of-the-art materials. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Energy Conversion and Storage, Other |