| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advancing Current and State-of-the-Art Application of Ni- and Co-based Superalloys
|
| Presentation Title |
Very High Cycle Fatigue of a Polycrystalline Co-base Superalloy |
| Author(s) |
Alice Cervellon, Sean Murray, Chris Torbet, Tresa M. Pollock |
| On-Site Speaker (Planned) |
Alice Cervellon |
| Abstract Scope |
Co-base superalloys have been extensively studied over the past decade, since γ/γ' microstructures with high volume fractions of the L12 phase were demonstrated in ternary Co-Al-W alloys. More complex compositions based on this system are promising for applications in turbine engines, as Co-base superalloys exhibit a higher melting temperature compared to Ni-base alloys. The high portion of Co also results in lower stacking fault energies, which directly affect the deformation mechanisms. The influence of stacking fault energy on creep deformation has been studied, but its influence on other properties such as very high cycle fatigue (VHCF) is not understood. The VHCF properties of the wrought Co-base superalloy CoNi-SB10+ were then studied in this work at ambient temperature using an ultrasonic fatigue machine. The crack initiation stage and the resultant fatigue life have been characterized and compared with Ni-base superalloys. The implication of the deformation mechanisms will be discussed. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |