A4 Refereed article in a conference publication
Surface roughness variance on different levels of surface inclination of powder bed fused tool steel 1.2709
Authors: Karlsson Jussi, Piiroinen Aki, Korpela Markus, Salminen Antti
Editors: Jan Frostevarg, Adrien Da Silva, Marie-Louise Palmblad, Lars Andersson
Conference name: Nordic Laser Materials Processing Conference
Publication year: 2021
Journal: IOP Conference Series: Materials Science and Engineering
Book title : 18th Nordic Laser Materials Processing Conference (18th NOLAMP) 18th-20th January 2022, Luleå, Sweden
Journal name in source: 18TH NORDIC LASER MATERIALS PROCESSING CONFERENCE (18TH NOLAMP)
Journal acronym: IOP CONF SER-MAT SCI
Article number: 012020
Series title: IOP Conference Series: Materials Science and Engineering
Volume: 1135
First page : 012020
Number of pages: 10
ISSN: 1757-8981
eISSN: 1757-899X
DOI: https://doi.org/10.1088/1757-899X/1135/1/012020
Web address : https://iopscience.iop.org/article/10.1088/1757-899X/1135/1/012020
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/175076585
Evolution of additive manufacturing has allowed increased flexibility and complexity of designs over conventional manufacturing e.g. formative and subtractive manufacturing. Restricting factor of laser powder bed fusion of metals (PBF-LB/M) additive manufacturing is the as built surface quality. To promote an understanding of the surface roughness and suitable surface measuring technologies octagon shaped tool steel 1.2709 samples was developed and manufactured. Different surface measuring technologies was also literary reviewed. Studied samples were manufactured with commercially available laser-based powder bed fusion system using standard parameter set provided by the system manufacturer. Surface roughness was measured from top and down skins from multiple different building angles in a way that process specific effects, such as direction of movement of the powder re-coater, was considered. Based on these measuring results of the samples the effect surface inclination are discussed. The results show that building angle strongly affects to surface roughness of laser-based powder bed fused parts. Surface roughness was measured to be more than five times worse in unsupported angle manufactured down facing surfaces when compared with vertical walls.
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