| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability in Extreme Environments
|
| Presentation Title |
Cyclic Oxidation Behavior of Novel Ni-based Superalloys |
| Author(s) |
Richard P. Oleksak, Martin Detrois, Paul D. Jablonski |
| On-Site Speaker (Planned) |
Richard P. Oleksak |
| Abstract Scope |
Oxidation resistance is an important requirement for Ni-based superalloys used in a variety of high temperature applications. Herein the oxidation performance was assessed for a new class of polycrystalline gamma-prime strengthened superalloys designed to have a gamma matrix with high configurational entropy, with alloy compositions of (wt%) Ni-20Co-13Cr-6Fe-4Al-3W-2Mo-(4-x)Nb-(x)Ti, where x = 0, 1 ,2. The cyclic oxidation behavior and the effect of Nb and Ti contents was assessed through exposure to dry air at 800 °C for 3,500 hours. The alloys were found to be borderline chromia/alumina formers, exhibiting good oxidation resistance relative to commercially available materials of similar composition. While all alloys formed alumina scales initially, only the alloy with the lowest Ti/Nb ratio retained an alumina scale for the duration of the exposure. The other alloys transitioned to chromia scale growth, where the growth rates increased with higher Ti/Nb ratios. The mechanisms driving this oxidation behavior are discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Environmental Effects, High-Temperature Materials, Copper / Nickel / Cobalt |