|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Advanced Characterization of High-temperature Alloys: Phase Evolution during Manufacturing and Service-induced Deformation
||Monotonic mechanical behavior of a nickel-based single crystal superalloy with a bimodal precipitation
||Jérémy Rame, Dominique Eyidi, Anne Joulain, Jonathan Cormier
|On-Site Speaker (Planned)
Nickel-based single crystal superalloys are key materials for the manufacturing of airfoils in aircraft engines. These materials are commonly casted using directional solidification Bridgman method. Then, solution heat treatment and agings are usually applied to (i) homogenize the chemistry across the dendritic structure; (ii) suppress the γ/γ’ interdendritic eutectic pools ; (iii) achieve a regular unimodal distribution of cuboidal γ′ precipitates (400 – 500 nm). Such microstructure is known to be optimal for creep strength. However, part’s microstructure can evolve during service operations. In particular, when exposed at a close-to-solvus temperature, γ′ precipitates dissolve which can lead to a bimodal microstructure with usual regular primary precipitates and smaller ~ 50 nm tertiary precipitates. In this presentation, a special focus will be paid to the impact of such a bimodal precipitate distribution on the tensile and creep behavior, analysed in the light of various SEM and TEM observations.
||High-Temperature Materials, Mechanical Properties, Characterization