About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Computational Thermodynamics and Kinetics
|
Presentation Title |
CALPHAD-enabled Design of a Compact Morphology Cobalt-based Superalloy for Additive Manufacturing |
Author(s) |
Krista Biggs, Brandon Snow, Julio Cesar Pereira dos Santos, Gregory Olson |
On-Site Speaker (Planned) |
Krista Biggs |
Abstract Scope |
Additively manufacturing superalloys is an attractive option in aerospace applications which require alloys with high strength and oxidation resistance at high temperatures, for its capacity to fabricate components with reduced material waste and optimized geometry for lightweighting. We have used CALPHAD to design a novel printable cobalt-based superalloy to operate at 900 ⁰C, inspired by Cozar and Pineau’s nickel-based compact morphology alloy, which incorporates multiple reinforcement phases for improved printability and resistance to coarsening compared to traditional γ-γ’ microstructures. The structural and kinematic considerations for selecting appropriate phases are discussed, considering the shear field which surrounds a precipitating γ’ particle due to its lattice mismatch with the matrix phase. Additionally, the relative phase fractions of the reinforcements are tuned to minimize the strain energy of the system resulting from the precipitates’ formation. The design’s prototype and the kinetics of forming its resulting microstructure are then assessed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, Phase Transformations, Other |