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An interlaboratory comparison of X-ray computed tomography measurement for texture and dimensional characterisation of additively manufactured parts

Townsend, Andrew; Racasan, Radu; Leach, Richard; Senin, Nicola; Thompson, Adam; Ramsey, Andrew; Bate, David; Woolliams, Peter; Brown, Stephen; Blunt, Liam

Authors

Andrew Townsend

Radu Racasan

Nicola Senin

Andrew Ramsey

David Bate

Peter Woolliams

Stephen Brown

Liam Blunt



Abstract

This paper presents the results of the CT-STARR (CT-Surface Texture for Additive Round Robin) Stage 1 interlaboratory comparison. The study compared the results obtained for the extraction of areal surface texture data per ISO 25178-2 from five X-ray computed tomography (CT) volume measurements from each of four laboratories. Two Ti6Al4V ELI (extra low interstitial) components were included in each of the CT acquisitions. The first component was an additively manufactured (AM) cube manufactured using an Arcam Q10 electron beam melting (EBM) machine. Surface texture data was extracted from CT scans of this part. The values of selected parameters per ISO 25178-2 are reported, including Sa, the arithmetic mean height, for which the values from the Nikon MCT 225 metrology CT measurements were all within 0.5% of the mean reference focus variation measurement. CT resolution requirements are discussed. The second component was a machined dimensional test artefact designed to facilitate independent analysis of CT global voxel scaling errors and surface determination errors. The results of mathematical global scaling and surface determination correction of the dimensional artefact data is reported. The dimensional test artefact errors for the XT H 225 commercial CT for length, outside diameter and inside diameter reduced from -0.27%, -0.83% and -0.54% respectively to less than 0.02% after performing mathematical correction. This work will assist the development of surface texture correction protocols, help define surface-from-CT measurement envelope limits and provide valuable information for an expanded Stage 2 interlaboratory comparison, which will include a more diverse range of CT systems and technologies, further expanding the surface-from-CT knowledge base.

Citation

Townsend, A., Racasan, R., Leach, R., Senin, N., Thompson, A., Ramsey, A., …Blunt, L. (2018). An interlaboratory comparison of X-ray computed tomography measurement for texture and dimensional characterisation of additively manufactured parts. Additive Manufacturing, 23, (422-432). doi:10.1016/j.addma.2018.08.013. ISSN 2214-7810

Journal Article Type Article
Acceptance Date Aug 9, 2018
Online Publication Date Aug 16, 2018
Publication Date Oct 30, 2018
Deposit Date Sep 10, 2018
Publicly Available Date Sep 10, 2018
Journal Additive Manufacturing
Print ISSN 2214-7810
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 23
Pages 422-432
DOI https://doi.org/10.1016/j.addma.2018.08.013
Publisher URL https://www.sciencedirect.com/science/article/pii/S2214860418303336?via%3Dihub
Additional Information This article is maintained by: Elsevier; Article Title: An interlaboratory comparison of X-ray computed tomography measurement for texture and dimensional characterisation of additively manufactured parts; Journal Title: Additive Manufacturing; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.addma.2018.08.013; Content Type: article; Copyright: © 2018 The Authors. Published by Elsevier B.V.

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/





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