A thermal model of the interaction of pulsed near-infrared laser radiation from a Nd:YAG laser was made, taking the measured powder properties such as reflectance, optical penetration depth and thermal conductivity into account. It allows an estimation of the evolution of two different temperatures: the average temperature of the powder (taken over the grains in a volume given by the laser beam diameter and the optical penetration depth) and the temperature distinction within a single grain. It showed that in pulsed mode consolidation can be achieved at much lower average power as the surface of the powder particles are molten but their cores remain at nearly room temperature. This leads to a much lower average temperature and therefore a dramatic decrease in residual thermal stresses in the finished piece. The results of the model were experimentally tested and confirmed.
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Similar content being viewed by others Explore related subjectsDiscover the latest articles and news from researchers in related subjects, suggested using machine learning. Author information Authors and AffiliationsInstitute of Applied Physics, Laser Materials Processing, University of Bern, 3012 Bern, Switzerland, , , , , , CH
P. Fischer, V. Romano & H.P. Weber
Center for Advanced Rapid Tooling, Mechanical Engineering Department, Swiss Federal Institute of Technology, 1015 Lausanne, Switzerland, , , , , , CH
N. Karapatis & R. Glardon
Received: 26 July 2001 / Accepted: 23 November 2001 / Published online: 23 January 2002
About this article Cite this articleFischer, P., Karapatis, N., Romano, V. et al. A model for the interaction of near-infrared laser pulses with metal powders in selective laser sintering . Appl Phys A 74, 467–474 (2002). https://doi.org/10.1007/s003390101139
Issue Date: April 2002
DOI: https://doi.org/10.1007/s003390101139
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