About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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Deformation and Damage Mechanisms of High Temperature Alloys
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Presentation Title |
Precipitate Free Zones (PFZ) Formation at Grain Boundaries in γ/γ Ni-based Superalloys |
Author(s) |
Guillaume Burlot, Jonathan Cormier, Anne Joulain, Dominique Eyidi, Patrick Villechaise |
On-Site Speaker (Planned) |
Guillaume Burlot |
Abstract Scope |
Formation and growth of secondary γ' precipitate free zones (PFZ) in the vicinity of grain boundaries in five superalloys has been investigated for different heat treatment times and temperatures. It has been shown that PFZ mainly form during close-to- γ'-solvus heat treatments and are associated to the precipitation of intergranular γ' precipitates.Since these precipitates have similar chemical composition to intragranular secondary γ', depletions on precipitate-former elements could lead to the dissolution of secondary γ' near the grain boundaries and finally to the formation of PFZ. PFZs width evolutions have been described using a parabolic evolution and their kinetics obey an Arrhenius-type law indicating a diffusion-controlled process.The influences of the grain size, the presence of intergranular particles and the composition of the alloys were also investigated, as well as the influence of PFZ on tensile properties. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Temperature Materials, Mechanical Properties, |