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CO2 laser polishing of laser-powder bed fusion produced AlSi10Mg parts

El Hassanin, Andrea orcid logoORCID: 0000-0001-9920-5169, Ahmed Obeidi, Muhannad orcid logoORCID: 0000-0003-2733-3828, Scherillo, Fabio orcid logoORCID: 0000-0002-2302-8968 and Brabazon, Dermot orcid logoORCID: 0000-0003-3214-6381 (2021) CO2 laser polishing of laser-powder bed fusion produced AlSi10Mg parts. Surface and Coatings Technology, 419 . ISSN 0257-8972

Poor surface quality represents an important issue that needs improvement for metal Additively Manufactured parts. Both short or long wavelength lasers have been applied for surface polishing in order to improve the surface finish. In this work, the possible use of a CO2 laser for the surface polishing of AlSi10Mg parts made by Laser-based Powder Bed Fusion (L-PBF) was explored. The high surface roughness in the as-built condition can lead to increased laser energy absorption. In order to assess the effects of the main laser-related process parameters, the experiments were carried out on L-PBF samples built vertically with respect to the build platform. Their effect on the surface were evaluated by means of the surface arithmetical mean height (Sa), surface skewness (Ssk) and primary profile root mean square slope (Pdq), obtained via confocal microscopy. Microstructure evolution was also investigated by means of SEM and EDS analysis. The results showed a large reduction in surface roughness, ranging from the 67% to the 85% of the starting value. Microstructure of the remolten layer revealed an increased grain size and an increased Si content that led to an overall hardness increase from 85 to 121 HV.
Item Type:Article (Published)
Additional Information:Article number: 127291
Uncontrolled Keywords:L-PBF; AlSi10Mg alloy; CO2 laser polishing; Surface roughness; SEM-EDS
Subjects:Engineering > Materials
Physical Sciences > Lasers
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Engineering and Computing > School of Mechanical and Manufacturing Engineering
Research Institutes and Centres > I-Form
Official URL:https://dx.doi.org/10.1016/j.surfcoat.2021.127291
Copyright Information:© 2021 Elsevier
ID Code:26036
Deposited On:25 Jun 2021 12:16 by Thomas Murtagh . Last Modified 08 May 2023 04:30

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