|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Modifying the Microstructure in Polycrystalline Nickel Base Superalloys Using a Stepped Cooling Rate
||Bader Alabbad, Sammy Tin
|On-Site Speaker (Planned)
For polycrystalline γ- γ′ nickel-base superalloys, the size, morphology and fraction of each of the γ′ precipitate populations is highly dependent upon the cooling rate from the solution temperature. Each of the precipitate populations can be engineered or tailored to modify a specific microstructural feature that can impact the resulting properties. For example, grain boundary γ′ precipitates can be used to control the grain size and/or serrate grain boundaries to mechanically interlock the boundaries and restrict sliding during creep deformation. The present investigation reports on how a stepped cooling rate was able to modify the microstructure of some experimental Ni-base superalloys. A slow cool through the γ′ solvus temperature to varying levels of undercooling followed by a faster, controlled cooling rate to control the size and distribution of the intragranular γ′ precipitates was performed. Experimental results will be presented and the implications of the microstructures on properties will be discussed.
||Planned: Supplemental Proceedings volume