| 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 |
Factors Controlling VHCF Life of Ni-based Single Crystal Superalloys |
| Author(s) |
Alice Cervellon, Luciana Maria Bortoluci Ormastroni, Satoshi Utada, Phillipp Kürnsteiner, Paraskevas Kontis, Lorena Mataveli Suave, Samuel Hemery, Patrick Villechaise, Jonathan Cormier |
| On-Site Speaker (Planned) |
Jonathan Cormier |
| Abstract Scope |
Service operations of sigle crystalline (SX) blades may lead to fatigue controlled failure mechanisms due to the vibrations introduced by the gas flow in addition to the centrifugal forces. Typical frequencies of vibrations of airfoils are in between 1 and 10 kHz, requiring specific experimental facilities to achieve the very high cycle fatigue (VHCF) domain at high temperature.
In this presentation, a critical analysis of the VHCF life sensitivity at 1,000°C/20 kHz to the processing parameters (dendritic chemical homogeneity, casting pore size, introduction of a prior plastic deformation and γ/γ’ microstructure degradation) will be performed using 10 different Ni-based SX alloys. A special attention will be paid in this presentation on the fine scale crack initiation mechanisms. By varying the casting process or the oxidation resistance among the different alloys studied, a map of crack initiation mechanisms in VHCF will finally be proposed for Ni-based SX alloys. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |