X-ray tomography characterisation of lattice structures processed by Selective Electron Beam Melting

Everth Hernández-Nava*, Samuel Tammas-Williams, Christopher Smith, Fabien Leonard, Philip J. Withers, Iain Todd, Russell Goodall

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number300
JournalMetals
Volume7
Issue number8
DOIs
Publication statusPublished - 5 Aug 2017

Keywords

  • Additive manufacturing
  • Cellular solids
  • Computed tomography
  • Titanium alloys

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