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Metals 2017, 7(8), 300; doi:10.3390/met7080300

X-ray Tomography Characterisation of Lattice Structures Processed by Selective Electron Beam Melting

1
Department of Material Science & Engineering, The University of Sheffield, Sir Robert Hadfield Building, Mappin St, S13 JD Sheffield, UK
2
Bundesanstalt für Material Forschung und Eprüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany
3
Henry Moseley X-ray Imaging Facility, School of Materials, The University of Manchester, M13 9PL Manchester, UK
*
Author to whom correspondence should be addressed.
Received: 13 June 2017 / Revised: 25 July 2017 / Accepted: 28 July 2017 / Published: 5 August 2017
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Abstract

Metallic lattice structures intentionally contain open porosity; however, they can also contain unwanted closed porosity within the structural members. The entrained porosity and defects within three different geometries of Ti-6Al-4V lattices, fabricated by Selective Electron Beam Melting (SEBM), is assessed from X-ray computed tomography (CT) scans. The results suggest that horizontal struts that are built upon loose powder show particularly high (~20 × 10−3 vol %) levels of pores, as do nodes at which many (in our case 24) struts meet. On the other hand, for struts more closely aligned (0° to 54°) to the build direction, the fraction of porosity appears to be much lower (~0.17 × 10−3%) arising mainly from pores contained within the original atomised powder particles. View Full-Text
Keywords: cellular solids; additive manufacturing; computed tomography; titanium alloys cellular solids; additive manufacturing; computed tomography; titanium alloys
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Hernández-Nava, E.; Tammas-Williams, S.; Smith, C.; Leonard, F.; Withers, P.J.; Todd, I.; Goodall, R. X-ray Tomography Characterisation of Lattice Structures Processed by Selective Electron Beam Melting. Metals 2017, 7, 300.

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