| About this Abstract |
| Meeting |
2019 TMS Annual Meeting & Exhibition
|
| Symposium
|
Gamma (FCC)/Gamma-Prime (L12) Co-Based Superalloys III
|
| Presentation Title |
The Effect of Long Term Exposure at Elevated Temperature on the Stability of a Novel Co-Ni Based Superalloy |
| Author(s) |
Ning Zhou, Alberto O Polar Rosas, Gian A Colombo, Tao Wang, Stéphane A.J. Forsik, Samuel J Kernion, Mario E Epler |
| On-Site Speaker (Planned) |
Ning Zhou |
| Abstract Scope |
The long-term stability of γ’ precipitates in Co-based superalloys is a major concern for high temperature applications because of the metastable nature of the FCC L12 phase. A novel Co-Ni based γ’ strengthened alloy was developed by a combined modeling and experimental approach. The alloy was vacuum induction melted into 18 Kg and 180 Kg ingots and forged using standard cast and wrought practices. Good high temperature mechanical properties and oxidation resistance have been observed. To study the effect of long-term stability, samples were exposed at 704°C and 816°C for up to 2000 hrs. Post exposure tension tests at elevated temperatures show no noticeable degradation with time. The microstructural evolution during exposure including γ’ coarsening and matrix-precipitates coherency has been investigated on the interpretation of the good high temperature stability of this alloy. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |