SUNConferences, 17th Annual Conference of the Rapid Product Development Association of South Africa

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EVALUATION OF SINGLE TRACKS AND SINGLE LAYERS MANUFACTURED AT DIFFERENT POWER DENSITIES AND SCAN SPEEDS BY SELECTIVE LASER MELTING
Nkutwane Washington Makoana, Hein Moller, Herman Burger, Monammme Tlotleng, Igor Yadroitsev

Last modified: 2016-10-03

Abstract


Selective Laser Melting (SLM) is one of the additive manufacturing processes that utilise a laser beam to selectively melt powder particles in order to manufacture parts directly from a 3D CAD model layer by layer. The initial units produced are single tracks; which creates a single layer; and from the sequence of layers a 3D object is manufactured.  The properties of parts produced by additive manufacturing, SLM, strongly depend on the properties of each single track and each layer formed by these tracks. This study evaluates the effect of processing parameters (i.e. laser power, scan speed and spot size) on geometrical characteristics of single tracks and the surface morphology of single layers manufactured from 17-4PH stainless steel powder. A commercial EOSINT M280 SLM system was used to manufacture single tracks and layers at low laser powers of up to 400W, while an in-house made SLM set up was used for high powers of up to 3kW. Samples manufactured were subjected to standard metallographic preparation techniques for further analysis with a optical microscope and scanning electron microscope (SEM). The results obtained are presented in this paper.

 


Keywords


Selective Laser Melting, 17-4PH, Single tracks, Single layers