|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Material Design Approaches and Experiences IV
||Stability of Carbides in Advanced Polycrystalline Ni-base Superalloys
||Stoichko Antonov, Sammy Tin
|On-Site Speaker (Planned)
In polycrystalline Ni-base superalloys, grain boundary carbides are often utilized to control grain size and minimize grain boundary sliding during creep deformation. As new alloying concepts for polycrystalline Ni-base superalloys are being developed to extend their temperature capability, the effect of increasing levels of Nb and Ta alloying additions on carbide stability and transformations need to be studied. Elevated levels of Ta and Nb contribute to thermodynamically stabilizing the blocky MC carbides. Long term thermal exposures of a broad range of experimental powder processed Ni-base superalloys containing various levels of Nb and Ta were completed to assess the stability of the carbides. It was found that additions of Nb and Co effect the formation of M23C6 along the grain boundaries in powder processed, polycrystalline Ni-base superalloys. Results of the study will be presented and compared to thermodynamic calculations.
||Planned: TMS Journal: JOM