About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
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Symposium
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Materials for High Temperature Applications: Next Generation Superalloys and Beyond
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Presentation Title |
Damage Mechanisms Involved during Very High Cycle Fatigue of a Coated and Grit-blasted Ni-based Single-crystal Superalloy |
Author(s) |
Alice Cervellon, Luciana Maria Bortoluci Ormastroni, Tresa M. Pollock, Fernando Pedraza, Jonathan Cormier |
On-Site Speaker (Planned) |
Alice Cervellon |
Abstract Scope |
The very high cycle fatigue (VHCF) regime of Ni-based single-crystal superalloys is mostly controlled by the size and nature of internal defects, typically large casting pores inherited from the solidification process. At the component scale, these alloys are coated in order to ensure sufficient oxidation/corrosion resistance. The impact of such surface deposition on the VHCF properties at 1,000°C has been assessed in this work.The deposition of an MCrAlY coating has been observed to reduce the VHCF life of CMSX-4 alloy compared to a polished surface. Damage mechanisms involved in the interdiffusion zone accelerate the early crack growth stage and the resultant fatigue life. Special attention was paid to the cellular recrystallization found in the interdiffusion zone and induced by the grit-blasting process applied to the specimens prior to the coating deposition. Uncoated grit-blasted specimens were independently studied to assess the impact of this process on the VHCF properties. |
Proceedings Inclusion? |
Planned: |