Possibilities of CT Scanning as Analysis Method in Laser Additive Manufacturing

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Karme , A , Kallonen , A , Matilainen , V-P , Piili , H & Salminen , A 2015 , ' Possibilities of CT Scanning as Analysis Method in Laser Additive Manufacturing ' , Physics Procedia , vol. 78 , pp. 347-356 . https://doi.org/10.1016/j.phpro.2015.11.049

Title: Possibilities of CT Scanning as Analysis Method in Laser Additive Manufacturing
Author: Karme, Aleksis; Kallonen, Aki; Matilainen, Ville-Pekka; Piili, Heidi; Salminen, Antti
Contributor organization: Department of Geosciences and Geography
Department of Physics
Evolutionary Palaeontology group
Date: 2015-11-24
Language: eng
Number of pages: 10
Belongs to series: Physics Procedia
ISSN: 1875-3892
DOI: https://doi.org/10.1016/j.phpro.2015.11.049
URI: http://hdl.handle.net/10138/222895
Abstract: Laser additive manufacturing is an established and constantly developing technique. Structural assessment should be a key component to ensure directed evolution towards higher level of manufacturing. The macroscopic properties of metallic structures are determined by their internal microscopic features, which are difficult to assess using conventional surface measuring methodologies. X-ray microtomography (CT) is a promising technique for three-dimensional non-destructive probing of internal composition and build of various materials. Aim of this study is to define the possibilities of using CT scanning as quality control method in LAM fabricated parts. Since the parts fabricated with LAM are very often used in high quality and accuracy demanding applications in various industries such as medical and aerospace, it is important to be able to define the accuracy of the build parts. The tubular stainless steel test specimens were 3D modelled, manufactured with a modified research AM equipment and imaged after manufacturing with a high-power, high-resolution CT scanner. 3D properties, such as surface texture and the amount and distribution of internal pores, were also evaluated in this study. Surface roughness was higher on the interior wall of the tube, and deviation from the model was systematically directed towards the central axis. Pore distribution showed clear organization and divided into two populations; one following the polygon model seams along both rims, and the other being associated with the concentric and equidistant movement path of the laser. Assessment of samples can enhance the fabrication by guiding the improvement of both modelling and manufacturing process.
Description: Nordic Laser Materials Processing Conference Volume: 78 Host publication title: 15th Nordic Laser Materials Processing Conference, Nolamp 15
Subject: 216 Materials engineering
Laser additive manufacturing
Stainless Steel
CT scanning
Surface roughness
114 Physical sciences
Peer reviewed: Yes
Rights: cc_by_nc_nd
Usage restriction: openAccess
Self-archived version: publishedVersion

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