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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium Advanced Characterization of High-temperature Alloys: Phase Evolution during Manufacturing and Service-induced Deformation
Presentation Title Temporal evolution of γ′ precipitate in HAYNES 282 during ageing: growth and coarsening kinetics, solute partitioning and lattice misfit
Author(s) Shreya Mukherjee, Bibhu Prasad Sahu, Aniruddha Biswas, Sujoy Kumar Kar, Soumitra Tarafder
On-Site Speaker (Planned) Shreya Mukherjee
Abstract Scope Elemental partitioning across the precipitate/matrix interface controls the kinetics of precipitate evolution, during growth and coarsening. We present the first comprehensive analysis of evolutions of microstructure, as well as the lattice misfit, in light of elemental partitioning, applied to a Ni-based superalloy, HAYNES 282. In this work, experimental analyses by APT, TEM, and XRD are combined with thermo-kinetic modelling using ThermoCalc and TC-PRISMA. The current study has isolated the growth and the coarsening regimes analyzed the respective kinetics and identified their individual rate-controlling processes. Diffusive growth and coarsening kinetics are found to closely match with the data of Cr and Ti for growth, and Mo for coarsening, respectively. For the coarsening kinetics, we have used the thermodynamic parameter corresponding to the non-dilute, non-ideal γ solid solution phase in the modified LSW equation. Constrained misfit has been found to be positive and decreased with ageing time.
Proceedings Inclusion? Planned:
Keywords High-Temperature Materials, Characterization, Other

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