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Precipitation of γ ″ in Inconel 718 alloy from microstructure to mechanical properties

Abstract : This paper presents a coupled approach able to describe γ precipitation evolution and associated yield strength after various heat treatments in Inconel 718 alloy. The precipitation state is modeled via the implementation of classical nucleation and growth theories for plate-shaped particles. The precipitation model is validated through small-angle neutron scattering and transmission electron microscopy experiments. The precipitation size distribution serves as an input parameter to model the yield strength using a micromechanical model based on shear and bypass mechanisms accounting for the particular shapes of the precipitates. Results are in good agreement with measured yield stresses for various precipitation states. A complete simulated TTT diagram of the γ phase with the associated yield strength is proposed. The coupled model is finally applied to a series of non-isothermal treatments representative of welding (or additive manufacturing) from the peak aged state.
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https://hal.archives-ouvertes.fr/hal-03366225
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Submitted on : Monday, October 11, 2021 - 10:37:47 AM
Last modification on : Tuesday, October 12, 2021 - 8:33:14 AM

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Alexandre Balan, Michel Perez, Thibaut Chaise, Sophie Cazottes, Didier Bardel, et al.. Precipitation of γ ″ in Inconel 718 alloy from microstructure to mechanical properties. Materialia, Elsevier, 2021, 20, pp.101187. ⟨10.1016/j.mtla.2021.101187⟩. ⟨hal-03366225⟩

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