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About the predictability of microstructure evolution upon thermomechanical processing of nickel-based superalloys

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Résumé

Hot-forging of aerojet turbine disks will be under focus in the presentation, with the aim of discussing the possibility of predicting the microstructure obtained after forging as a function of the applied thermomechanical parameters. In case of classical discontinuous recrystallization, with nucleation along the former grain boundaries and growth driven by stored energy, dynamic and post-dynamic microstructure evolutions can be predicted by using a quite mean field model, both for supersolvus and subsolvus conditions. on the other hand, critical grain growth sometimes occurs, a phenomenon that is clearly driven by local metallurgical conditions and topology. Full field models are then necessary for predicting such topological events. Another example of non-conventional evolution that remains difficult to model and thus to predict, is the heteroepitaxial recrystallization phenomenon recently reported in γ-γ' alloys where nucleation arises from a phase transformation process inside primary precipitates.
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hal-01507106 , version 1 (12-04-2017)

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  • HAL Id : hal-01507106 , version 1

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Nathalie Bozzolo, Charbel Moussa, Marc Bernacki. About the predictability of microstructure evolution upon thermomechanical processing of nickel-based superalloys. TMS 2017 - 146th Annual Meeting and Exhibition - Materials for High Temperature Applications: Next Generation Superalloys and Beyond, The Minerals, Metals & Materials Society (TMS), Feb 2017, San Diego, United States. ⟨hal-01507106⟩
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