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Laser polishing of additive manufactured 316L stainless steel synthesized by selective laser melting

Ahmed Obeidi, Muhannad orcid logoORCID: 0000-0003-2733-3828, McCarthy, Éanna, Ahad, Inam Ul orcid logoORCID: 0000-0002-3802-6156, O'Connell, Barry orcid logoORCID: 0000-0002-7438-3425 and Brabazon, Dermot orcid logoORCID: 0000-0003-3214-6381 (2019) Laser polishing of additive manufactured 316L stainless steel synthesized by selective laser melting. Materials, 12 (6). ISSN 1996-1944

One of the established limitations of metal additive manufacturing (AM) methods, such as selective laser melting (SLM), is the resulting rough surface finish. Laser polishing is one method that can be used to achieve an improved surface finish on AM printed parts. This study is focused on the laser surface polishing of AM parts using CO2 laser beam irradiation. Despite the fact that several researchers have investigated the traditional abrasive polishing method, there is still a lack of information reporting on the laser surface polishing of metal parts. In this study, AM 316L stainless steel cylindrical samples were polished using CO2 laser beam irradiation in continuous wave (CW) working mode. Two design of experiment models were developed for the optimization of the input processing parameters by statistical analysis of their effect on the resulting roughness. The processing parameters investigated were the laser beam power, the rotat ional speed of the sample, the number of laser scan passes, the laser beam focal position, and the percentage overlap of the laser tracks between consecutive passes. The characterization of the measured roughness and the modified layer microstructure was carried out using 3D optical and scanning electron microscopy (SEM). A maximum reduction of the roughness from 10.4 to 2.7 µm was achieved and no significant change in the microstructure phase type and micro-hardness was observed.
Item Type:Article (Published)
Uncontrolled Keywords:laser polishing; additive manufacturing (AM); metal 3D printing; 316L; stainless steel; surface processing
Subjects:Engineering > Materials
Engineering > Mechanical engineering
Engineering > Engineering education
Engineering > Biomedical engineering
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Engineering and Computing > School of Mechanical and Manufacturing Engineering
Research Institutes and Centres > Advanced Processing Technology Research Centre (APTRC)
Research Institutes and Centres > I-Form
Official URL:https://doi.org/10.3390/ma12060991
Copyright Information:© 2019 MDPI (Basel, Switzerland) Open Access
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Science Foundation Ireland (SFI) under Grant Number 16/RC/3872, European Regional Development Fund, Programme for Research in Third Level Institutions (PRTLI) Cycle 5 (via ERDF)
ID Code:23212
Deposited On:24 Apr 2019 10:52 by Muhannad Ahmed Obeidi . Last Modified 19 Nov 2021 14:03

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