Laser Polishing of Additive Manufactured Aluminium Parts by Modulated Laser Power

In this study a new approach to laser polishing with periodic modulated laser power in the kilohertz regime is introduced. By varying the modulation frequency and modulation time, different periodic laser power curves with varying minimum, peak and average laser power can be created. The feasibility...

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Autores principales:	Markus Hofele, André Roth, Jochen Schanz, Johannes Neuer, David K. Harrison, Anjali K. M. De Silva, Harald Riegel
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	additive manufacturing laser remelting 3D printing selective laser melting (SLM) surface quality aluminium AlSi10Mg Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/d4b239d2460244f68732858e0be833f7
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id	oai:doaj.org-article:d4b239d2460244f68732858e0be833f7
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spelling	oai:doaj.org-article:d4b239d2460244f68732858e0be833f72021-11-25T18:23:11ZLaser Polishing of Additive Manufactured Aluminium Parts by Modulated Laser Power10.3390/mi121113322072-666Xhttps://doaj.org/article/d4b239d2460244f68732858e0be833f72021-10-01T00:00:00Zhttps://www.mdpi.com/2072-666X/12/11/1332https://doaj.org/toc/2072-666XIn this study a new approach to laser polishing with periodic modulated laser power in the kilohertz regime is introduced. By varying the modulation frequency and modulation time, different periodic laser power curves with varying minimum, peak and average laser power can be created. The feasibility of the method is shown by polishing of vertical built AlSi10Mg L-PBF parts with an initial roughness of Ra = 12.22 µm. One polishing pass revealed a decreasing surface roughness with increasing energy density on the surface up to Ra = 0.145 µm. An increasing energy density results in a rising remelting depth between 50 and 255 µm and a rising relative porosity of 0.3% to 4.6%. Furthermore, the thermal process stability, analysed by the melt pool length in scanning direction, reveals a steadily increasing melt pool dimension due to component heating. Multiple laser polishing passes offers a further reduced surface roughness, especially at higher modulation frequencies and provides an improved orientation independent roughness homogeneity. The process stability regarding varying initial surface roughness revealed an almost constant relative roughness reduction rate with an achievable roughness variation after two polishing passes between Ra = 0.13–0.26 µm from an initial state of Ra = 8.0–19.2 µm.Markus HofeleAndré RothJochen SchanzJohannes NeuerDavid K. HarrisonAnjali K. M. De SilvaHarald RiegelMDPI AGarticleadditive manufacturinglaser remelting3D printingselective laser melting (SLM)surface qualityaluminium AlSi10MgMechanical engineering and machineryTJ1-1570ENMicromachines, Vol 12, Iss 1332, p 1332 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	additive manufacturing laser remelting 3D printing selective laser melting (SLM) surface quality aluminium AlSi10Mg Mechanical engineering and machinery TJ1-1570
spellingShingle	additive manufacturing laser remelting 3D printing selective laser melting (SLM) surface quality aluminium AlSi10Mg Mechanical engineering and machinery TJ1-1570 Markus Hofele André Roth Jochen Schanz Johannes Neuer David K. Harrison Anjali K. M. De Silva Harald Riegel Laser Polishing of Additive Manufactured Aluminium Parts by Modulated Laser Power
description	In this study a new approach to laser polishing with periodic modulated laser power in the kilohertz regime is introduced. By varying the modulation frequency and modulation time, different periodic laser power curves with varying minimum, peak and average laser power can be created. The feasibility of the method is shown by polishing of vertical built AlSi10Mg L-PBF parts with an initial roughness of Ra = 12.22 µm. One polishing pass revealed a decreasing surface roughness with increasing energy density on the surface up to Ra = 0.145 µm. An increasing energy density results in a rising remelting depth between 50 and 255 µm and a rising relative porosity of 0.3% to 4.6%. Furthermore, the thermal process stability, analysed by the melt pool length in scanning direction, reveals a steadily increasing melt pool dimension due to component heating. Multiple laser polishing passes offers a further reduced surface roughness, especially at higher modulation frequencies and provides an improved orientation independent roughness homogeneity. The process stability regarding varying initial surface roughness revealed an almost constant relative roughness reduction rate with an achievable roughness variation after two polishing passes between Ra = 0.13–0.26 µm from an initial state of Ra = 8.0–19.2 µm.
format	article
author	Markus Hofele André Roth Jochen Schanz Johannes Neuer David K. Harrison Anjali K. M. De Silva Harald Riegel
author_facet	Markus Hofele André Roth Jochen Schanz Johannes Neuer David K. Harrison Anjali K. M. De Silva Harald Riegel
author_sort	Markus Hofele
title	Laser Polishing of Additive Manufactured Aluminium Parts by Modulated Laser Power
title_short	Laser Polishing of Additive Manufactured Aluminium Parts by Modulated Laser Power
title_full	Laser Polishing of Additive Manufactured Aluminium Parts by Modulated Laser Power
title_fullStr	Laser Polishing of Additive Manufactured Aluminium Parts by Modulated Laser Power
title_full_unstemmed	Laser Polishing of Additive Manufactured Aluminium Parts by Modulated Laser Power
title_sort	laser polishing of additive manufactured aluminium parts by modulated laser power
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/d4b239d2460244f68732858e0be833f7
work_keys_str_mv	AT markushofele laserpolishingofadditivemanufacturedaluminiumpartsbymodulatedlaserpower AT andreroth laserpolishingofadditivemanufacturedaluminiumpartsbymodulatedlaserpower AT jochenschanz laserpolishingofadditivemanufacturedaluminiumpartsbymodulatedlaserpower AT johannesneuer laserpolishingofadditivemanufacturedaluminiumpartsbymodulatedlaserpower AT davidkharrison laserpolishingofadditivemanufacturedaluminiumpartsbymodulatedlaserpower AT anjalikmdesilva laserpolishingofadditivemanufacturedaluminiumpartsbymodulatedlaserpower AT haraldriegel laserpolishingofadditivemanufacturedaluminiumpartsbymodulatedlaserpower
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Laser Polishing of Additive Manufactured Aluminium Parts by Modulated Laser Power

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