| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Refractory Metals 2023
|
| Presentation Title |
Chromium-based bcc-Superalloys Tailored by Iron Addition |
| Author(s) |
Kan Ma, Thomas Blackburn, Pedro A Ferreirós, Christina Hofer, Paul Bagot, Michael Moody, Tatu Pinomaa, Mathias Galetz, Alexander J Knowles |
| On-Site Speaker (Planned) |
Kan Ma |
| Abstract Scope |
Chromium-based alloys offer significant advantages for next-generation concentrated solar power applications at high temperatures (>600°C) related to their melting point, costs and oxidation resistance. However, the mechanical properties of Cr-based materials still need improvement to match current Ni-based superalloys, both for creep resistance and low temperature toughness. This work follows a ‘bcc-superalloy’ strengthening concept with bcc-Cr-matrix comprising ordered-bcc NiAl-intermetallic precipitates to develop Cr-based bcc-superalloys. Furthermore, Fe is alloyed to tailor the precipitate volume fraction and properties. This work addresses the demonstration of the nano-structure by electron microscopy and atom probe tomography. Results show the advantageous ageing behaviour of Cr superalloys compared to ferritic superalloys and nickel-based superalloys. The Fe-enhanced Cr-superalloys exhibit high hardness of ~500 HV0.5, dominated by solid-solution and precipitate strengthening mechanisms. Microstructure tailoring with Fe additions offers a new design pathway to improve the balance of properties in Cr-superalloys and so accelerate their development for high temperature applications. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
High-Temperature Materials, Characterization, Other |