Surface topographies of metal additive manufactured components are inherently characterized by the presence of complex surface characteristics (e.g. re-entrant features), which are not accessible by contact or optical techniques. Micro X-ray computed tomography has been demonstrated capable of measuring non-accessible surfaces and micro-scale surface features, including undercuts. In this work, an innovative approach for evaluating the accuracy and establishing the traceability of surface topography measurements obtained by X-ray computed tomography is presented. Reference samples produced by selective laser melting of Ti6Al4V were specifically designed in order to acquire reference cross-sectional surface profiles representing the actual morphology (including re-entrant features) using an imaging probing system. Surface topographies were measured on these samples by X-ray computed tomography, confocal microscopy and focus variation. Moreover, the effect of different voxel dimensions on the accuracy of surface topography measurements performed by X-ray computed tomography was investigated.

New method to evaluate the accuracy of CT surface topography measurements of additively manufactured metal parts

Filippo Zanini
;
SBETTEGA, ELIA;Marco Sorgato;Simone Carmignato
2018

Abstract

Surface topographies of metal additive manufactured components are inherently characterized by the presence of complex surface characteristics (e.g. re-entrant features), which are not accessible by contact or optical techniques. Micro X-ray computed tomography has been demonstrated capable of measuring non-accessible surfaces and micro-scale surface features, including undercuts. In this work, an innovative approach for evaluating the accuracy and establishing the traceability of surface topography measurements obtained by X-ray computed tomography is presented. Reference samples produced by selective laser melting of Ti6Al4V were specifically designed in order to acquire reference cross-sectional surface profiles representing the actual morphology (including re-entrant features) using an imaging probing system. Surface topographies were measured on these samples by X-ray computed tomography, confocal microscopy and focus variation. Moreover, the effect of different voxel dimensions on the accuracy of surface topography measurements performed by X-ray computed tomography was investigated.
2018
Proceedings of International Conference on Industrial Computed Tomography - iCT 2018
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3262092
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