About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Deformation and Damage Mechanisms of High Temperature Alloys
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Presentation Title |
Very High Cycle Fatigue Properties of CoNi- and Ni-based Single-crystal Superalloys |
Author(s) |
Alice Cervellon, Tresa M. Pollock, Chris J. Torbet |
On-Site Speaker (Planned) |
Alice Cervellon |
Abstract Scope |
Co-base superalloys have been 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, especially for CoNi systems that present a higher oxidation resistance. In these alloys, the high portion of Co results in lower stacking fault energies, which 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 is not understood. This work aims at studying the VHCF properties of a single-crystal CoNi-based superalloy at 750°C and 950°C. The crack initiation stage and the fatigue life have been characterized and compared with Ni-base superalloys. Finally, characterizations performed on Ni-based SX superalloys will be presented to better understand the crack initiation stage in the VHC regime. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Temperature Materials, Mechanical Properties, |