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Internal surface measurement of metal powder bed fusion parts

Thompson, Adam; Senin, Nicola; Maskery, Ian; Körner, Lars; Lawes, Simon; Leach, Richard


Nicola Senin

Lars Körner


Recent advances in X-ray computed tomography (XCT) have allowed for measurement resolutions approaching the point where XCT can be used for measuring surface topography. These advances make XCT appealing for measuring hard-to-reach or internal surfaces, such as those often present in additively manufactured parts. To demonstrate the feasibility and potential of XCT for topography measurement, topography datasets obtained using two XCT systems are compared to those acquired using coherence scanning interferometry and focus variation microscopy. A hollow Ti6Al4V part produced by laser powder bed fusion is used as a measurement artefact. The artefact comprises two component halves that can be separated to expose the internal surfaces. Measured surface datasets are accurately aligned and similarly cropped, and compared by various qualitative and quantitative means, including the computation of ISO 25178-2 areal surface texture parameters, commonly used in part quality assessment. Results show that XCT can non-destructively provide surface information comparable with more conventional surface measurement technologies, thus representing a viable alternative to more conventional measurement, particularly appealing for hard-to-reach and internal surfaces.


Thompson, A., Senin, N., Maskery, I., K├Ârner, L., Lawes, S., & Leach, R. (2018). Internal surface measurement of metal powder bed fusion parts. Additive Manufacturing, 20,

Journal Article Type Article
Acceptance Date Jan 22, 2018
Online Publication Date Feb 3, 2018
Publication Date Mar 1, 2018
Deposit Date Mar 7, 2018
Publicly Available Date Feb 4, 2019
Journal Additive Manufacturing
Print ISSN 2214-7810
Electronic ISSN 2214-8604
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 20
Keywords X-ray computed tomography; Metrology; Surface texture; Metal powder bed fusion
Public URL
Publisher URL
Copyright Statement Copyright information regarding this work can be found at the following address:


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