SUNConferences, RAPDASA 2014

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PECULIARITIES OF SINGLE TRACK FORMATION FROM TI6AL4V ALLOY AT DIFFERENT LASER POWER DENSITIES BY SLM
Ina Yadroitsava, J. Els, G. Booysen, I. Yadroitsev

Last modified: 2014-10-24

Abstract


Modern industry requires searching for new methods of producing complex parts with the desired internal structure from modern materials. The rapid development of additive manufacturing (AM) in recent years is a reflection of these requirements. Selective laser melting (SLM) is very suitable technology for the fabrication of complex objects with well-developed structure in one working cycle. Selective laser melting sometimes even is called “3D printing of metal powders”, emphasizing the simplicity and elegance of the idea of adding powder material during manufacturing process. In fact, selective laser melting of powders is a very complex and costly process. SLM is found to be a multi-disciplinary field, as a number of different physical phenomena play a role in producing the final result. The properties of an object produced by this technology depend strongly on the quality of each single track, each layer and their superposition. Temperature distribution during SLM is important because temperature fields determine the morphology of tracks and layers, microstructure and finally mechanical properties of the SLM part. The most of published works with Ti6Al4V alloy are devoted to the study of the properties of SLM objects retrieved as a whole, without an analysis of single tracks. The analysis of single track provides information about the causes of porosity, pore shapes or their chains in 3D part. Also knowledge of the shape and geometry of single tracks produced by different process parameters allows selecting an optimal strategy for manufacturing of full dense objects or lattice structures. Analysis of temperature fields opens opportunities to build parts with desired properties by SLM. This work describes the shapes and geometrical characteristics of SLM single tracks manufactured with different laser powers (20-170 W) and scanning speeds (0.1-2.0 m/s). Simulation of temperature distribution during processing was conducted. Conclusion regarding optimal process parameters and peculiarities of selective laser melting of Ti6Al4V alloy at low and high laser powers and scanning speeds was done.

 


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