About this Abstract |
Meeting |
5th International Congress on 3D Materials Science (3DMS 2021)
|
Symposium
|
5th International Congress on 3D Materials Science (3DMS 2021)
|
Presentation Title |
Towards Quantitative Modeling of Precipitate Morphology Evolution in Co-based Superalloys |
Author(s) |
Wenkun Wu, James Warren, Peter Voorhees, Olle Heinonen |
On-Site Speaker (Planned) |
Olle Heinonen |
Abstract Scope |
Cobalt-based superalloys with γ/γ' microstructures offer great promise as candidates for next-generation high-temperature alloys. It is essential to understand the thermodynamic and kinetic factors that influence the microstructural evolution of these alloys in order to optimize the alloy compositions and processing steps with a goal to improve their coarsening, creep and rafting behavior. We are developing a phase field approach using the chemical free energies extracted from CALPHAD thermodynamic data developed at NIST to predict the equilibrium shapes of Co-Al-W γ' precipitates.
We find that the equilibrium shape of the precipitate results from a delicate competition between chemical, interfacial and elastic energies. We are examining how modeling input parameters such as the form of the chemical free energy, anisotropy of the interfacial energy, and variant misfit and diffusivity due to temperature change affect the coarsening and rafting behavior of superalloy models and relate these parameters to experimentally available values. |
Proceedings Inclusion? |
Definite: Other |