About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials for High Temperature Applications: Next Generation Superalloys and Beyond
|
Presentation Title |
Early Stage Oxidation of Ni- and Co-based Superalloys: Novel Insights from Rapid Thermal Annealing (RTA) Experiments |
Author(s) |
Dorota Kubacka, Erdmann Spiecker |
On-Site Speaker (Planned) |
Dorota Kubacka |
Abstract Scope |
Single crystal Ni-base superalloys are commonly used in modern jet engines but approach fundamental performance limits. Potential applications of Co-base superalloys are still limited due to their insufficient oxidation resistance. Early stages of oxidation appear to be crucial for understanding the difference between the oxidation behavior of Ni- and Co-base superalloys.
We exploit the potential of a rapid thermal annealing (RTA) furnace in combination with advanced electron microscopy to investigate the early stages of high-temperature oxidation. The RTA furnace allows complex processing recipes including steep temperature profiles and varying atmospheres. We address the first seconds to minutes of oxidation for two model Ni- and Co-base superalloys at 900°C. Our results prove that difference in oxidation behavior can be directly correlated to the two-phase microstructure and the different partitioning of the alloying elements to γ and γ'. These insights can guild the development of new Co-SA with improved oxidation resistance. |
Proceedings Inclusion? |
Planned: |