Childerhouse, T., Hernandez-Nava, E., M’Saoubi, R. et al. (2 more authors) (2020) Surface and sub-surface integrity of Ti-6Al-4V components produced by selective electron beam melting with post-build finish machining. In: Arrazola, P.J. and Madariaga, A., (eds.) Procedia CIRP. 5th CIRP Conference on Surface Integrity (CSI 2020), 01-05 Jun 2020, Vitoria-Gasteiz, Basque Country, Spain. Elsevier BV , pp. 309-314.
Abstract
The emergence of metal additive manufacturing (AM) processes offer manufacturers a promising alternative to traditional forging and casting techniques for the production of near net shape titanium alloy components. However, limitations in both the surface finish quality and the geometric accuracy of parts produced by AM means that post-build finish machining of the part remains to be a requirement to produce high precision components. Furthermore, the fatigue performance of material produced directly by these processes is often limited by both the poor surface finish and porosity related defects which occur within the material. This study investigates the implications of machining stock allowance on the surface integrity of Ti-6Al-4V specimens produced by selective electron beam melting (SEBM) followed by post-build finish machining. The study revealed that the exposure of porosity related defects on the newly machined surface varied depending on the depth of material removed from the as-built specimen surface during machining. Four point bend fatigue testing of the specimens was carried out to determine the effect of the exposed surface defects on the fatigue performance of the material. This study highlights that the non-uniform distribution of pores within SEBM Ti-6Al-4V means that careful considerations must be given regarding machining stock allowance in the design of these components due to the implications of material removal depth on surface integrity.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Editors: |
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Copyright, Publisher and Additional Information: | © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the scientific committee of the 5th CIRP CSI 2020. |
Keywords: | Additive manufacturing; finish machining; low cycle fatigue |
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) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 02 Jul 2020 14:35 |
Last Modified: | 02 Jul 2020 14:35 |
Status: | Published |
Publisher: | Elsevier BV |
Refereed: | Yes |
Identification Number: | 10.1016/j.procir.2020.02.018 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:162692 |