| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
The Impact of the Cooling Rate on Controlling the Grain Boundary Morphology and the Mechanical Properties of Nickel-based Superalloys |
| Author(s) |
Bader Alabbad, Sammy Tin |
| On-Site Speaker (Planned) |
Bader Alabbad |
| Abstract Scope |
For polycrystalline Ni-base superalloys, meso-scale engineering for grain boundary structures can be utilized through the development of serrated grain boundaries via controlling cooling process as the precipitation of γ′ precipitates is highly sensitive to the cooling rate. Controlled two-step cooling process was proposed to introduce small volume fraction of coarse γ′ along the grain boundaries to serrate the grain boundaries and to produce fine intragranular γ′ precipitates that are necessary to provide strength. Maintaining a slow initial cooling rate through the γ′ solvus-temperature enables the formation of large grain boundary γ′ precipitates that grow and serrate the grain boundary before the nucleation of the secondary γ′ precipitates. Transitioning to a faster cooling rate can be used to control the size and density of the secondary γ′ precipitates. The microstructure evolution and mechanical properties of the two-step cooling processes were compared and benchmarked to those produced via conventional continuous cooling processes. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |