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Influence of Pulsed Exposure Strategies on Overhang Structures in Powder Bed Fusion of Ti6Al4V Using Laser Beam

dc.contributor.authorJonas Grünewald
dc.contributor.authorPirmin Clarkson
dc.contributor.authorRyan Salveson
dc.contributor.authorGeorg Fey
dc.contributor.authorKatrin Wudy
dc.contributor.otherProfessorship of Laser-based Additive Manufacturing, Department of Mechanical Engineering, School of Engineering & Design, Technical University of Munich, Boltzmannstraße 15, 85748 Garching, Germany
dc.contributor.otherProfessorship of Laser-based Additive Manufacturing, Department of Mechanical Engineering, School of Engineering & Design, Technical University of Munich, Boltzmannstraße 15, 85748 Garching, Germany
dc.contributor.otherAMCM GmbH, Petersbrunner Straße 1b, 82319 Starnberg, Germany
dc.contributor.otherAMCM GmbH, Petersbrunner Straße 1b, 82319 Starnberg, Germany
dc.contributor.otherProfessorship of Laser-based Additive Manufacturing, Department of Mechanical Engineering, School of Engineering & Design, Technical University of Munich, Boltzmannstraße 15, 85748 Garching, Germany
dc.date.accessioned2021-07-23T14:54:20Z
dc.date.available2025-10-02T03:31:45Z
dc.date.issued01-07-2021
dc.identifier.issn-
dc.identifier.urihttps://www.mdpi.com/2075-4701/11/7/1125
dc.description.abstractManufacturing structures with low overhang angles without support structures is a major challenge in powder bed fusion of metals using laser beam (PBF-LB/M). In the present work, various test specimens and parameter sets with continuous wave (cw) and pulsed exposure are used to investigate whether a reduction of downskin roughness and overhang angle can be achieved in PBF-LB/M of Ti6Al4V. Starting from cw exposure, the limits of overhang angle and surface roughness at the downskin surface are investigated as a reference. Subsequently, the influence of laser power, scanning speed, and hatch distance with fixed pulse duration (<i>τ<sub>pulse</sub></i> = 25 µs) and repetition rate (<i>υ<sub>rep</sub></i> = 20 kHz) on surface roughness <i>R<sub>a</sub></i> is investigated. Pulsed exposure strategies enable the manufacturing of flatter overhang angles (≤20° instead of ≥25°). Furthermore, a correlation between the introduced volume energy density and the downskin roughness can be observed for pulsed exposure. As the reduction in volume energy density causes an increase in porosity, the combination of pulsed downskin exposure and commercial cw infill exposure is investigated. The larger the gap in volume energy density between the infill area and downskin area, the more challenging it is combining the two parameter sets. By combining cw infill and pulsed downskin exposure, flatter overhang structures cannot be manufactured, and a reduction in roughness can be achieved.
dc.format-
dc.language.isoEN
dc.publisherMDPI AG
dc.relation.uri['https://www.vetpat.ru/', 'https://www.vetpat.ru/jour/about/editorialPolicies#focusAndScope', 'https://www.vetpat.ru/jour/about/submissions#authorGuidelines']
dc.rightsCC BY
dc.subject['parasitology', 'animal immunology', 'animal pathology', 'animal morphology', 'animal physiology', 'veterinary medicine', 'Veterinary medicine', 'SF600-1100']
dc.subject.lccMining engineering. Metallurgy
dc.titleInfluence of Pulsed Exposure Strategies on Overhang Structures in Powder Bed Fusion of Ti6Al4V Using Laser Beam
dc.typeArticle
dc.description.keywordsadditive manufacturing
dc.description.keywordspowder bed fusion of metals using laser beam
dc.description.keywordsPBF-LB/M
dc.description.keywordsTi6Al4V
dc.description.keywordsTi64
dc.description.keywordspower modulation
dc.description.pages-
dc.description.doi10.3390/met11071125
dc.title.journalMetals
dc.identifier.e-issn2075-4701
dc.identifier.oaioai:doaj.org/journal:48d413c8dfb54698a2eb9a9dd9e22e1f
dc.journal.infoVolume 11, Issue 7


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