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Open AccessFeature PaperArticle

In Situ Characterization of Inconel 718 Post-Dynamic Recrystallization within a Scanning Electron Microscope

1
MINES ParisTech, PSL-Research University, CEMEF-Centre de Mise en Forme des matériaux, CNRS UMR 7635, CS 10207 rue Claude Daunesse, 06904 Sophia Antipolis CEDEX, France
2
Thermomechanical Metallurgy Laboratory-PX Group Chair, Ecole Polytechnique Fédérale de Lausanne (EPFL), Rue de la Maladière 71B-CP 526, CH-2002 Neuchatel, Switzerland
*
Author to whom correspondence should be addressed.
Metals 2017, 7(11), 476; https://doi.org/10.3390/met7110476
Received: 22 September 2017 / Revised: 29 October 2017 / Accepted: 2 November 2017 / Published: 4 November 2017
(This article belongs to the Special Issue Dynamic Recrystallization Behavior of Metallic Materials)
Microstructure evolution within the post-dynamic regime following hot deformation was investigated in Inconel 718 samples with different dynamically recrystallized volume fractions and under conditions such that no δ-phase particles were present. In situ annealing treatments carried out to mimic post-dynamic conditions inside the Scanning Electron Microscope (SEM) chamber suggest the occurrence of both metadynamic and static recrystallization mechanisms. Static recrystallization was observed in addition to metadynamic recrystallization, only when the initial dynamically recrystallized volume fraction was very small. The initial volume fraction of dynamically recrystallized grains appears to be decisive for subsequent microstructural evolution mechanisms and kinetics. In addition, the formation of annealing twins is observed along with the growth of recrystallized grains, but then the twin density decreases as the material enters the capillarity-driven grain growth regime. View Full-Text
Keywords: Inconel 718; microstructure; processing; post-dynamic recrystallization; in situ annealing; annealing twins Inconel 718; microstructure; processing; post-dynamic recrystallization; in situ annealing; annealing twins
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MDPI and ACS Style

Zouari, M.; Logé, R.E.; Bozzolo, N. In Situ Characterization of Inconel 718 Post-Dynamic Recrystallization within a Scanning Electron Microscope. Metals 2017, 7, 476.

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