Chechik, L. orcid.org/0000-0002-7626-2694, Christofidou, K.A., Farquhar, L. et al. (3 more authors) (2023) Tools for the assessment of the laser printability of nickel superalloys. Metallurgical and Materials Transactions A, 54 (6). pp. 2421-2437. ISSN 1073-5623
Abstract
Additive Manufacturing (AM) is a revolutionary technology with great interest from the aerospace sector, due to the capability of manufacturing complex geometries and repairing of damaged components. A significant volume of research is being conducted with high-temperature alloys, particularly nickel superalloys. However, the high-temperature properties of nickel superalloys are derived from the high fraction of strengthening precipitates, which in turn, lead to poor amenability to additive manufacture. Various cracking modes are common in nickel superalloys, primarily as a result of the high level of alloying and the extreme thermal conditions experienced in AM. Herein, crack susceptibility calculations from literature were critically analyzed and combined, resulting in a simple failure susceptibility that correlates with literature. Currently, the range of alloys which have been tested in AM and reported in literature is limited and lacks a standard methodology, making accurate assessment of printability difficult. Scheil solidification calculations were performed, testing solute trapping (ST) and back diffusion models for both the cooling rates associated with laser powder bed fusion (L-PBF) and laser-directed energy deposition (L-DED). The results confirm that L-PBF exhibits cooling rates that can result in ST, unlike in L-DED. These differences mean that alloys cannot be developed more generally for AM, but must be developed with a specific AM process in mind.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2023 The Author(s). This is an author-produced version of a paper subsequently published in Metallurgical and Materials Transactions A. This version is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0). |
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/R512175/1 EPSRC Rolls-Royce Strategic Partnership Grant EP/P006566/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 29 Mar 2023 10:34 |
Last Modified: | 02 Oct 2024 16:13 |
Status: | Published |
Publisher: | Springer Science and Business Media LLC |
Refereed: | Yes |
Identification Number: | 10.1007/s11661-023-07029-5 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:197821 |