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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Computational Thermodynamics and Kinetics
Presentation Title Phase Field of Modeling of Pore Annihilation in Nickel-base Superalloys during Hot Isostatic Pressing
Author(s) Yann Le Bouar, Antoine Ruffini, Benoit Dabas, Alphonse Finel, Alexander I. Epishin, Thomas Link, Gert Nolze, Bernard Fedelich, Titus Feldmann, Bernard Viguier, Dominique Poquillon
On-Site Speaker (Planned) Yann Le Bouar
Abstract Scope High-pressure turbine blades are critical components of aircraft engines. They are cast as single-crystals of nickel-base superalloys. A negative side effect is the formation of casting micropores initiating fatigue failure during service. The pores can be removed by hot isostatic pressing (HIP) performed at temperature close to solidus. However, pore annihilation in single-crystals at high temperature is a complex multiscale physical process, which is still poorly understood. In this work, we present a new phase field model developed to analyze the important driving forces in this process. The model includes vacancy diffusion, dislocation climb as well as surface tension of the pore. The model is implemented in Fourier space, and three-dimensional simulations are performed to analyze the kinetics of the pore annihilation. Finally, the results are compared to experiments performed in the CMSX-4 nickel-base superalloy at 1288°C.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

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