| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Refractory Metals 2023
|
| Presentation Title |
Alloys of Chromium-Silicon Alloys with Iron and Nickel for Structural High Temperature Applications |
| Author(s) |
Michael Kerbstadt, Emma Marie Hamilton White, Mathias C. Galetz |
| On-Site Speaker (Planned) |
Mathias C. Galetz |
| Abstract Scope |
Cr-Si based-alloys are promising candidates due to their high melting point and good oxidation resistance. They are designed for working temperatures beyond Ni-base superalloys. The major drawbacks of Cr- based alloys are the embrittlement by Cr2N formation and high ductile to brittle transition temperatures (DBTT).
This work investigates the effect of alloying Cr-Si-alloys with the elements Fe and Ni and targets the microstructure and precipitation of A15 phase. Varied compositions are manufactured by arc-melting and heat treatment at 1200°C, which enables controlled precipitation hardening by the Cr3Si-A15 phase.
Ni can cause the effect of solution softening in Cr and increases the low-temperature ductility as a result. For Fe it is shown, that it stabilizes the two-phase structure consisting of nitration resistant A15 phase and Crss. Oxidation exposures at 1200°C in synthetic air indicate that Fe additions up to 5 at.% increase also the nitridation resistance of Crss. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Characterization, High-Temperature Materials, Energy Conversion and Storage |