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Title: Multiscale microstructural heterogeneity and mechanical property scatter in Inconel 718 produced by directed energy deposition
Authors: Yeoh, Yong Chen
Macchi. Guido
Jain, Ekta
Gaskey, Bernard
Raman, Sudharshan
Tay, Grace
Verdi, Davide
Patran, Alin
Grande, Antonio Mattia
Seita, Matteo
Keywords: Engineering::Mechanical engineering
Issue Date: 2021
Source: Yeoh, Y. C., Macchi. Guido, Jain, E., Gaskey, B., Raman, S., Tay, G., Verdi, D., Patran, A., Grande, A. M. & Seita, M. (2021). Multiscale microstructural heterogeneity and mechanical property scatter in Inconel 718 produced by directed energy deposition. Journal of Alloys and Compounds, 887, 161426-.
Project: NRFNRFF2018–05 
Journal: Journal of Alloys and Compounds 
Abstract: Directed energy deposition (DED) is an additive manufacturing technique that enables rapid production and repair of metallic parts with flexible geometry. The complex nature of thermal and material transport during DED can yield unwanted microstructure heterogeneity, which causes scatter in parts performance. Here, we investigate microstructure variations at different length scales in Inconel 718 produced by powder-blown DED using different deposition rates. We quantify spatial trends in grain structure, texture, composition, and solidification structure within parts and correlate them with variations in hardness, yield strength, and Young's Modulus to highlight the effect of the thermal environment during solidification. We find that the high energy input employed when using high deposition rates is conducive to significant microstructure heterogeneity along both the build and transversal directions, which stems from the asymmetric cooling rates generated by the deposition strategy used. We also find that standard heat treatments employed on Inconel 718 are not suitable to homogenize the microstructure. These results have important implications for the development of industrially relevant build rate strategies for additively manufactured parts.
ISSN: 0925-8388
DOI: 10.1016/j.jallcom.2021.161426
Rights: © 2021 The Authors. Published by Elsevier B.V. under CC_BY_NC_ND_4.0 license.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles
MSE Journal Articles
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