Microstructure Evolution in AM Produced Superalloy Thin Struts at Low Plastic Strain

Journal article

Delcuse, L, Bahi, S., Gunputh, U., Ben Haj Slama, A., Guitton, A., Rusinek, A., Maloufi, N., Williams, G. and Wood, P. 2024. Microstructure Evolution in AM Produced Superalloy Thin Struts at Low Plastic Strain. Materials Today Communications. 39, pp. 1-10. https://doi.org/10.1016/j.mtcomm.2024.108739
AuthorsDelcuse, L, Bahi, S., Gunputh, U., Ben Haj Slama, A., Guitton, A., Rusinek, A., Maloufi, N., Williams, G. and Wood, P.
Abstract

This paper discusses the microstructures and textures that develop in thin struts fabricated in Inconel 718 using
laser melting powder bed fusion. Thin struts 1 mm wide were fabricated in the vertical (ZX) and horizontal build
(XY) orientations with respect to the build plate. Three distinct regions of well-defined grain structures with
centerline symmetry from the outer border to the center of the inner volume were present, which was attributed to
the laser scan strategy, consisting of a fill hatch, inner and outer border scan on each 30 m layer. Using ex situ
micro-tensile testing and enhanced Back-Scattered Electrons (BSE) and Electron Back Scattered Diffraction
(EBSD), the microstructure evolution to a plastic strain near 1%, in both the ZX and XY build direction was
studied in the initial undeformed and final deformed states. For the ZX build direction, grain rotation as well as
grain boundary migration was observed and was more significant than in the samples fabricated in XY. This paper
discusses the evolution of the microstructure offering valuable insights into the relationship between
microstructure and mechanical properties in complex AM produced microstructures.

KeywordsInconel 718; Additive manufacturing; Complex microstructures; Border and volume fill scan; Thin struts; Microscale testing
Year2024
JournalMaterials Today Communications
Journal citation39, pp. 1-10
PublisherElsevier
ISSN 2352-4928
Digital Object Identifier (DOI)https://doi.org/10.1016/j.mtcomm.2024.108739
Web address (URL)https://www.sciencedirect.com/science/article/pii/S2352492824007207?via%3Dihub
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Output statusPublished
Publication dates
Online04 Apr 2024
Publication process dates
Accepted24 Mar 2024
Deposited10 Apr 2024
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