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Proceedings Paper

Post-processing of 3D-printed parts using femtosecond and picosecond laser radiation
Author(s): Ilya Mingareev; Nils Gehlich; Tobias Bonhoff; Wilhelm Meiners; Ingomar Kelbassa; Tim Biermann; Martin C. Richardson
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Paper Abstract

Additive manufacturing, also known as 3D-printing, is a near-net shape manufacturing approach, delivering part geometry that can be considerably affected by various process conditions, heat-induced distortions, solidified melt droplets, partially fused powders, and surface modifications induced by the manufacturing tool motion and processing strategy. High-repetition rate femtosecond and picosecond laser radiation was utilized to improve surface quality of metal parts manufactured by laser additive techniques. Different laser scanning approaches were utilized to increase the ablation efficiency and to reduce the surface roughness while preserving the initial part geometry. We studied post-processing of 3D-shaped parts made of Nickel- and Titanium-base alloys by utilizing Selective Laser Melting (SLM) and Laser Metal Deposition (LMD) as additive manufacturing techniques. Process parameters such as the pulse energy, the number of layers and their spatial separation were varied. Surface processing in several layers was necessary to remove the excessive material, such as individual powder particles, and to reduce the average surface roughness from asdeposited 22-45 μm to a few microns. Due to the ultrafast laser-processing regime and the small heat-affected zone induced in materials, this novel integrated manufacturing approach can be used to post-process parts made of thermally and mechanically sensitive materials, and to attain complex designed shapes with micrometer precision.

Paper Details

Date Published: 6 March 2014
PDF: 7 pages
Proc. SPIE 8970, Laser 3D Manufacturing, 89700R (6 March 2014); doi: 10.1117/12.2040049
Show Author Affiliations
Ilya Mingareev, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Fraunhofer-Institut für Lasertechnik (Germany)
Nils Gehlich, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Fraunhofer-Institut für Lasertechnik (Germany)
Tobias Bonhoff, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Fraunhofer-Institut für Lasertechnik (Germany)
Wilhelm Meiners, Fraunhofer-Institut für Lasertechnik (Germany)
Ingomar Kelbassa, Fraunhofer-Institut für Lasertechnik (Germany)
Tim Biermann, Fraunhofer-Institut für Lasertechnik (Germany)
Joining Technologies, Inc. (United States)
Martin C. Richardson, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)


Published in SPIE Proceedings Vol. 8970:
Laser 3D Manufacturing
Henry Helvajian; Alberto Piqué; Martin Wegener; Bo Gu, Editor(s)

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