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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium Accelerated Discovery and Insertion of Next Generation Structural Materials
Presentation Title Design of a Compact Morphology Cobalt-based Superalloy for Additive Manufacturing
Author(s) Krista Biggs, Brandon Snow, Benjamin Graybill, Christopher Kiehl, Gregory Olson
On-Site Speaker (Planned) Krista Biggs
Abstract Scope There is significant potential for the use of additively manufactured cobalt-based superalloys in turbine engine blades because they are capable of higher operating temperatures than their nickel-based counterparts. We have designed a novel cobalt-based superalloy to operate at 900 ⁰C (approximately 200 ⁰C hotter than printable nickel-based superalloys), inspired by Cozar and Pineau’s nickel-based compact morphology alloy. The design incorporates multiple reinforcement phases for improved printability and resistance to coarsening compared to traditional γ-γ’ microstructures. The structural and elastic 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 using finite element analysis 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 Additive Manufacturing, Computational Materials Science & Engineering, Copper / Nickel / Cobalt


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