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

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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https://hal.univ-lorraine.fr/hal-03608596
Contributor : Julien Zollinger Connect in order to contact the contributor
Submitted on : Monday, March 14, 2022 - 10:36:23 PM
Last modification on : Tuesday, May 3, 2022 - 2:24:02 PM

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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, Elsevier, 2021, 195, pp.113740. ⟨10.1016/j.scriptamat.2021.113740⟩. ⟨hal-03608596⟩

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