| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Refractory Metals 2024
|
| Presentation Title |
Development of a Cr-Mo-Si Refractory Metal Alloy for High (>1100°C) Temperature Service |
| Author(s) |
Lisa Koliotassis, Emma M. H. White, Mathias C. Galetz |
| On-Site Speaker (Planned) |
Lisa Koliotassis |
| Abstract Scope |
Chromium is a promising base element for new high temperature (HT) alloys due to its low density, high melting point, high thermal conductivity, availability and low cost. The remaining barriers to applying Cr, such as the high ductile-to-brittle transition temperature (DBTT) and poor HT corrosion properties (volatile species and nitridation) must be addressed by alloying. Silicon additions were shown to be beneficial for low oxidation rates, precipitation hardening and for forming a nitridation-resistant intermetallic phase (A15). Molybdenum alloying can improve the HT mechanical and corrosion properties. The influence of Mo additions (up to 40 at.%) on Cr-xSi alloy microstructures was studied via arc-melted buttons. Suitable annealing treatments were developed. The oxidation behavior at 1200°C and RT hardness were analyzed as a function of Mo content and heat treatment. Scale up by a powder metallurgical processing route was explored. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Other, Other |