|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||MC Carbide Characterization in a High Refractory Content Powder Processed Ni-based Superalloy
||Stoichko Antonov, Sammy Tin
|On-Site Speaker (Planned)
Carbide precipitates in Ni-base superalloys are considered to be desirable phases that can contribute to improving high temperature properties. To date, most of the knowledge pertaining to carbide formation have originated from assessments of cast and wrought Ni-base superalloys. As powder processed superalloys are becoming increasingly widespread, understanding the different mechanisms by which they form becomes important. Detailed characterization of MC carbides in two high Nb-content powder processed superalloys revealed that Hf additions affect the carbide morphologies, which was attributed to a higher magnitude of elastic strain energy along the interface associated with Hf being soluble in the MC carbide lattice. The composition of the MC carbides was studied through APT and consisted of a complex carbo-nitride core with slight Hf segregation, surrounded by a Nb carbide shell. The characterization results were compared to DFT calculations and found to be in good agreement.
||Planned: None Selected