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

Hernandez-Nava, E, Tammas-Williams, S, Smith, C, Leonard, F, Withers, PJ, Todd, I and Goodall, R (2017) X-ray Tomography Characterisation of Lattice Structures Processed by Selective Electron Beam Melting. Metals, 7 (8). ISSN 2075-4701

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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.

Item Type: Article
Uncontrolled Keywords: Science & Technology; Technology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Materials Science; cellular solids; additive manufacturing; computed tomography; titanium alloys; MECHANICAL-PROPERTIES; TI-6AL-4V
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TK Electrical engineering. Electronics. Nuclear engineering
Divisions: Maritime and Mechanical Engineering
Publisher: MDPI AG
Related URLs:
Date Deposited: 11 Apr 2019 08:16
Last Modified: 11 Apr 2019 08:22
DOI or Identification number: 10.3390/met7080300
URI: http://researchonline.ljmu.ac.uk/id/eprint/10532

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