New insights into the origin of fine equiaxed microstructures in additively manufactured Inconel 718 - Université de Lorraine Access content directly
Journal Articles Scripta Materialia Year : 2021

New insights into the origin of fine equiaxed microstructures in additively manufactured Inconel 718

Julien Zollinger
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S. Mathieu
Benoît Appolaire

Abstract

Fine equiaxed grain regions are frequently observed in additively manufactured Inconel 718 alloy. Based on a grain-to-grain orientation analysis using EBSD, many assemblies of neighboring grains in these regions have been found to display multiple-twins orientation relationships sharing common< 110> directions and exhibiting 5-fold symmetry. This is an experimental proof that the grain refinement observed in inconel 718 is due to Icosahedral Short-Range Order (ISRO) mediated nucleation mechanism. This is the first report of ISRO-mediated nucleation of fcc nickel which widens the perspectives on the microstructures control in additive manufacturing of Ni-based superalloys.
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Dates and versions

hal-03608596 , version 1 (13-02-2023)

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Attribution - NonCommercial

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I. Cazic, Julien Zollinger, S. Mathieu, M. El Kandaoui, P. Plapper, et al.. New insights into the origin of fine equiaxed microstructures in additively manufactured Inconel 718. Scripta Materialia, 2021, 195, pp.113740. ⟨10.1016/j.scriptamat.2021.113740⟩. ⟨hal-03608596⟩
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