Selective Laser Melting Strategy for Fabrication of Thin Struts Usable in Lattice Structures

Brno University of Technology, Faculty of Mechanical Engineering, Institute of Machine and Industrial Design, Technická 2896/2, 616 69 Brno, Czech Republic

Brno University of Technology, Faculty of Mechanical Engineering, Institute of Materials Science and Engineering, Technická 2896/2, 616 69 Brno, Czech Republic

Brno University of Technology, Central European Institute of technology BUT, Purkyňova 123, 612 00 Brno, Czech Republic

Author to whom correspondence should be addressed.

Materials 2018, 11(9), 1763; https://doi.org/10.3390/ma11091763

Received: 30 August 2018 / Revised: 9 September 2018 / Accepted: 12 September 2018 / Published: 18 September 2018

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Abstract

This paper deals with the selective laser melting (SLM) processing strategy for strut-lattice structure production which uses only contour lines and allows the porosity and roughness level to be managed based on combination of the input and linear energy parameters. To evaluate the influence of a laser scanning strategy on material properties and surface roughness a set of experiments was performed. The single welds test was used to find the appropriate processing parameters to achieve continuous welds with known width. Strut samples were used to find a suitable value of weld overlapping and to clarify the influence of input and linear laser energy on the strut porosity and surface roughness. The samples of inclined hollow struts were used to compare the wall thickness with single welds width; the results showed about 25% wider welds in the case of a hollow strut. Using the proposed SLM strategy it is possible to reach a significantly lower porosity and surface roughness of the struts. The best results for struts with an inclination of 35.26° were achieved with 25% track overlapping, input energy in the range from 9 J to 10.5 J and linear energy E_lin from 0.25 to 0.4 J/mm; in particular, the relative density of 99.83% and the surface roughness on the side of the strut of Ra 14.6 μm in an as-built state was achieved. View Full-Text

Keywords: selective laser melting (SLM); AlSi10Mg aluminum alloy; scanning strategy; porosity; roughness; contour strategy; melt-pool size; linear energy; input energy

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MDPI and ACS Style

Vrána, R.; Koutný, D.; Paloušek, D.; Pantělejev, L.; Jaroš, J.; Zikmund, T.; Kaiser, J. Selective Laser Melting Strategy for Fabrication of Thin Struts Usable in Lattice Structures. Materials 2018, 11, 1763. https://doi.org/10.3390/ma11091763

AMA Style

Vrána R, Koutný D, Paloušek D, Pantělejev L, Jaroš J, Zikmund T, Kaiser J. Selective Laser Melting Strategy for Fabrication of Thin Struts Usable in Lattice Structures. Materials. 2018; 11(9):1763. https://doi.org/10.3390/ma11091763

Chicago/Turabian Style

Vrána, Radek, Daniel Koutný, David Paloušek, Libor Pantělejev, Jan Jaroš, Tomáš Zikmund, and Jozef Kaiser. 2018. "Selective Laser Melting Strategy for Fabrication of Thin Struts Usable in Lattice Structures" Materials 11, no. 9: 1763. https://doi.org/10.3390/ma11091763

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Selective Laser Melting Strategy for Fabrication of Thin Struts Usable in Lattice Structures

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