Livera, E.R. orcid.org/0000-0003-3573-4859, Christofidou, K.A. orcid.org/0000-0002-8064-5874, Miller, J.R. et al. (4 more authors) (2024) Microstructural control of LPBF Inconel 718 through post processing of intentionally placed AM discontinuity distributions. Materialia, 36. 102163. ISSN 2589-1529
Abstract
A major untapped potential of laser powder bed fusion (LPBF) is the ability to additively manufacture (AM) parts with site-specific properties. However, robust methods of improving performance and manufacturing efficiency via spatial variations in microstructure are underexplored. This work investigates a method of creating several distinctive multi-modal microstructures in the nickel superalloy, Inconel 718, by performing a Hot Isostatic Pressing (HIP) procedure on characteristic LPBF discontinuities such as keyhole and lack of fusion (LOF) porosity, as well as large powder filled voids. Observed using electron backscattered diffraction, this approach leads to the formation of site-specific variations in microstructure and extreme bi-modal microstructures. Processing AM parts via this method facilitates the production of fully dense, equiaxed, and strain free material culminating in a substantial time saving per layer. Further optimisation is required in order to achieve an optimum volume fraction and distribution of γ″ precipitates in each heat treated microstructure.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2024 The Authors. Published by Elsevier B.V. on behalf of Acta Materialia Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
Keywords: | Nickel superalloys; Laser powder bed fusion; Additive manufacturing; Functional grading; Microstructural control; Bi-modal microstructures; Increased productivity |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Funding Information: | Funder Grant number Engineering and Physical Sciences Research Council EP/P006566/1 Engineering and Physical Sciences Research Council EP/S019367/1 Engineering and Physical Sciences Research Council EP/R00661X/1 Engineering and Physical Sciences Research Council EP/L016273/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/R00661X/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 26 Jul 2024 15:34 |
Last Modified: | 26 Jul 2024 15:34 |
Status: | Published |
Publisher: | Elsevier BV |
Refereed: | Yes |
Identification Number: | 10.1016/j.mtla.2024.102163 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:215272 |