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Mechanisms of selective laser sintering and heat transfer in Ti powder

Nikolay K. Tolochko (Institute of Technical Acoustics, National Academy of Sciences of Belarus, Vitebsk, Belarus)
Maxim K. Arshinov (Institute of Technical Acoustics, National Academy of Sciences of Belarus, Vitebsk, Belarus)
Andrey V. Gusarov (Institute of Metallurgy and Material Science, Russian Academy of Sciences, Moscow, Russia)
Victor I. Titov (Institute of Metallurgy and Material Science, Russian Academy of Sciences, Moscow, Russia)
Tahar Laoui (School of Engineering and Built Environment, University of Wolverhampton, Wolverhampton, United Kingdom)
Ludo Froyen (Department of Metallurgy and Materials Engineering, University of Leuven (KU Leuven), Heverlee, Belgium)

Rapid Prototyping Journal

ISSN: 1355-2546

Article publication date: 1 December 2003

Abstract

Coupled metallographic examination and heat transfer numerical simulation are applied to reveal the laser sintering mechanisms of Ti powder of 63‐315 μm particle diameter. A Nd:YAG laser beam with a diameter of 2.7‐5.3 mm and a power of 10‐100 W is focused on a bed of loose Ti powder for 10 s in vacuum. The numerical simulation indicates that a nearly hemispherical temperature front propagates from the laser spot. In the region of α‐Ti just behind the front, heat transfer is governed by thermal radiation. The balling effect, formation of melt droplets, is not observed because the temperature increases gradually and the melt appears inside initially sintered powder which resists the surface tension of the melt.

Keywords

Citation

Tolochko, N.K., Arshinov, M.K., Gusarov, A.V., Titov, V.I., Laoui, T. and Froyen, L. (2003), "Mechanisms of selective laser sintering and heat transfer in Ti powder", Rapid Prototyping Journal, Vol. 9 No. 5, pp. 314-326. https://doi.org/10.1108/13552540310502211

Publisher

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MCB UP Ltd

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