Chechik, L. orcid.org/0000-0002-7626-2694, Christofidou, K.A. orcid.org/0000-0002-8064-5874, Markanday, J.F.S. et al. (5 more authors) (2022) Hardness variation in inconel 718 produced by laser directed energy deposition. Materialia, 26. 101643. ISSN 2589-1529
Abstract
Directed energy deposition (DED) of Inconel 718 is of critical importance for the repair of aerospace components, which have tight tolerances for certification, particularly on mechanical properties. Significant hardness variation has been seen throughout DED manufactured Inconel 718 components, suggestive of variation in mechanical properties, which must be understood such that the variation can either be removed, or implemented within the design in line with regulatory guidance. In this work, γʹ precipitation was theorised to be the cause of hardness variation throughout the component, despite Inconel 718 conventionally being regarded as a γʺ strengthened alloy. A simple precipitation potential model based on a moving heat source was found to correlate with the measured hardness and explain the hardness distribution observed. In addition, it has been shown that sections under a critical thickness of 2 mm never reach the peak hardness in the as-built condition. This understanding allows for the development of in-situ heat treatment strategies to be developed for microstructural, and hence, mechanical property optimisation, necessary for repair technologies where post processing steps are limited.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2022 The Authors. This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
Keywords: | Laser deposition; Precipitation; Hardness; Ni-based superalloys |
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/P02470X/1 Engineering and Physical Sciences Research Council EP/P025285/1 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/R512175/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 05 Dec 2022 11:16 |
Last Modified: | 05 Dec 2022 11:16 |
Status: | Published |
Publisher: | Elsevier BV |
Refereed: | Yes |
Identification Number: | 10.1016/j.mtla.2022.101643 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:194034 |