Lewis Newton
Areal topography measurement of metal additive surfaces using focus variation microscopy
Newton, Lewis; Senin, Nicola; Gomez, Carlos; Danzl, Reinhard; Helmli, Franz; Blunt, Liam; Leach, Richard
Authors
Nicola Senin
Carlos Gomez
Reinhard Danzl
Franz Helmli
Liam Blunt
Professor RICHARD LEACH RICHARD.LEACH@NOTTINGHAM.AC.UK
CHAIR IN METROLOGY
Abstract
In this work, the performance of a focus variation instrument for measurement of areal topography of metal additive surfaces was investigated. Samples were produced using both laser and electron beam powder bed fusion processes with some of the most common additive materials: Al-Si-10Mg, Inconel 718 and Ti-6Al-4V. Surfaces parallel and orthogonal to the build direction were investigated. Measurement performance was qualified by visually inspecting the topographic models obtained from measurement and quantified by computing the number of non-measured data points, by estimating local repeatability error in topography height determination and by computing the value of the areal field texture parameter Sa. Variations captured through such indicators were investigated as focus variation-specific measurement control parameters were varied. Changes in magnification, illumination type, vertical resolution and lateral resolution were investigated. The experimental campaign was created through full factorial design of experiments, and regression models were used to link the selected measurement process control parameters to the measured performance indicators. The results indicate that focus variation microscopy measurement of metal additive surfaces is robust to changes of the measurement control parameters when the Sa texture parameter is considered, with variations confined to sub-micrometre scales and within 5% of the average parameter value for the same surface and objective. The number of non-measured points and the local repeatability error were more affected by the choice of measurement control parameters. However, such changes could be predicted by the regression models, and proved consistent once material, type of additive process and orientation of the measured surface are set.
Citation
Newton, L., Senin, N., Gomez, C., Danzl, R., Helmli, F., Blunt, L., & Leach, R. (2019). Areal topography measurement of metal additive surfaces using focus variation microscopy. Additive Manufacturing, 25, 365-389. https://doi.org/10.1016/j.addma.2018.11.013
Journal Article Type | Article |
---|---|
Acceptance Date | Nov 9, 2018 |
Online Publication Date | Nov 15, 2018 |
Publication Date | 2019-01 |
Deposit Date | Nov 28, 2018 |
Publicly Available Date | Nov 28, 2018 |
Journal | Additive Manufacturing |
Print ISSN | 2214-7810 |
Electronic ISSN | 2214-8604 |
Publisher | Elsevier |
Peer Reviewed | Peer Reviewed |
Volume | 25 |
Pages | 365-389 |
DOI | https://doi.org/10.1016/j.addma.2018.11.013 |
Keywords | Additive manufacturing; Laser powder bed fusion; Electron beam powder bed fusion; Surface metrology; Focus variation microscopy |
Public URL | https://nottingham-repository.worktribe.com/output/1316024 |
Publisher URL | https://www.sciencedirect.com/science/article/pii/S2214860418306171?via%3Dihub |
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Areal topography measurement of metal additive surfaces using focus variation microscopy
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Publisher Licence URL
https://creativecommons.org/licenses/by/4.0/
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