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Effect of X-Ray Computed Tomography Magnification on Porosity Analysis of Additively Manufactured Parts
Örebro University, School of Science and Technology.ORCID iD: 0000-0003-1286-3420
Örebro University, School of Science and Technology.ORCID iD: 0000-0003-1408-2249
Technical University of Denmark, Copenhagen, Denmark.ORCID iD: 0000-0002-2895-1882
2018 (English)In: World PM2018 Congress Proceedings, 2018Conference paper, Published paper (Refereed)
Abstract [en]

X-ray computed tomography has been widely used for inspection of parts manufactured using additive manufacturing (AM) and powder metallurgy (PM). The ability of this method to non-destructively evaluate the porosity content of parts fabricated using AM and PM has made it a reliable method for such inspection. The results obtained from this method are highly dependent on CT acquisition parameters such as the magnification (resolution) at which the part has been scanned. Depending on the size of the parts the scan might need to be performed at lower magnifications which results in loss of information for porosity analysis. Therefore the effect of changing CT magnification on the obtained porosity of an additively manufactured specimen made of AlSi10Mg is investigated in this study. The specimen was scanned at various magnifications resulting in data sets with different resolutions. The porosity content was measured for each data set and the results showed that the porosity measurement using CT is highly dependent on the magnification (resolution) at which the data sets are acquired. The results from this study provided essential information about the porosity content which should be expected depending on the CT magnification.

Place, publisher, year, edition, pages
2018.
Keywords [en]
Porosity, X-ray computed tomography (CT), Additive manufacturing (AM)
National Category
Mechanical Engineering
Research subject
Mechanical Engineering
Identifiers
URN: urn:nbn:se:oru:diva-69047OAI: oai:DiVA.org:oru-69047DiVA, id: diva2:1250786
Conference
2018 World Congress on Powder Metallurgy (WORLDPM2018), Beijing, China, September 16-20, 2018
Available from: 2018-09-25 Created: 2018-09-25 Last updated: 2019-08-28Bibliographically approved
In thesis
1. Application of X-ray Computed Tomography for Assessment of Additively Manufactured Products
Open this publication in new window or tab >>Application of X-ray Computed Tomography for Assessment of Additively Manufactured Products
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Additive Manufacturing (AM) is a novel method for fabricating parts from three-dimensional model data, usually by joining materials in layer upon layer fashion. The freedom of design in this method has resulted in new possibilities for fabrication of parts with complex geometries. Manufacturing nearnet- shape parts as well as geometrically complex components such as periodic cellular structures that are used in lightweight structural components, has made AM a promising manufacturing method in industry.

Despite the numerous advantages of the AM methods, the imperfections associated with the manufacturing processes has limited the application of additively manufactured parts. Porosity and surface texture of AM parts especially those fabricated using Laser Powder Bed Fusion (LPBF) methods, have been studied in this thesis. It was observed that the mentioned imperfections have a considerable impact on the mechanical performance of thin-wall structures that are the constituting units of surface-based periodic cellular structures. The quality of internal structure in components fabricated using Fused Deposition Modelling (FDM) and its effect on the strength of those components were the other issues investigated in this thesis.

In order to investigate the mechanical strength of AM parts, as the result of mentioned mesoscale imperfections, appropriate evaluation methods that are capable of quantitatively assessing these imperfections are required. X-ray Computed Tomography (CT), a non-destructive evaluation method, has shown high capabilities for providing useful and reliable geometrical information of both internal and external features of AM components. The challenges involved with the application of CT for assessment of AM component are also studied in this thesis.

Apart from the contributions of this thesis on how CT may be used in AM field, the results of this thesis has provided insight into the design process of cellular structures. This thesis has provided essential information about the strength dependency of thin-walls as the result of mesoscale fabrication defects and how these defects are dependent on the selected material and design of the structure.

Place, publisher, year, edition, pages
Örebro: Örebro University, 2019. p. 61
Series
Örebro Studies in Technology, ISSN 1650-8580 ; 85
Keywords
Additive manufacturing, X-ray computed tomography, Surface roughness
National Category
Other Mechanical Engineering
Identifiers
urn:nbn:se:oru:diva-75190 (URN)978-91-7529-296-0 (ISBN)
Public defence
2019-09-17, Örebro universitet, Långhuset, Hörsal L1, Fakultetsgatan 1, Örebro, 09:15 (English)
Opponent
Supervisors
Available from: 2019-07-22 Created: 2019-07-22 Last updated: 2019-08-30Bibliographically approved

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Zekavat, Amir RezaPejryd, Lars

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