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Article

Investigations on Mechanical Properties of Lattice Structures with Different Values of Relative Density Made from 316L by Selective Laser Melting (SLM)

1
Faculty of Mechatronics and Aerospace, Military University of Technology, 2 Gen. S. Kaliskiego Street, 00-908 Warsaw, Poland
2
College of Material Science and Chemical Engineering, Harbin Engineering University, 145 Nan-Tong Street, Harbin 15000, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(9), 2204; https://doi.org/10.3390/ma13092204
Received: 18 April 2020 / Revised: 5 May 2020 / Accepted: 8 May 2020 / Published: 11 May 2020
(This article belongs to the Special Issue Mechanical Behavior of Composite Materials)
Nine variants of regular lattice structures with different relative densities have been designed and successfully manufactured. The produced structures have been subjected to geometrical quality control, and the manufacturability of the implemented selective laser melting (SLM) technique has been assessed. It was found that the dimensions of the produced lattice struts differ from those of the designed struts. These deviations depend on the strut orientation in relation to the specimen-building direction. Additionally, the microstructures and phase compositions of the obtained structures were characterized and compared with those of conventionally produced 316L stainless steel. The microstructure analysis and X-ray diffraction (XRD) patterns revealed a single austenite phase in the SLM samples. Both a certain broadening and a displacement of the austenite peaks were observed due to residual stresses and a crystallographic texture induced by the SLM process. Furthermore, the mechanical behavior of the lattice structure material has been defined. It was demonstrated that under both quasi-static and dynamic testing, lattice structures with high relative densities are stretch-dominated, whereas those with low relative densities are bending-dominated. Moreover, the linear dependency between the value of energy absorption and relative density under dynamic loading conditions has been established. View Full-Text
Keywords: lattice structures; additive manufacturing; selective laser melting; powder bed fusion; energy absorption; dynamic compression; crashworthiness lattice structures; additive manufacturing; selective laser melting; powder bed fusion; energy absorption; dynamic compression; crashworthiness
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MDPI and ACS Style

Płatek, P.; Sienkiewicz, J.; Janiszewski, J.; Jiang, F. Investigations on Mechanical Properties of Lattice Structures with Different Values of Relative Density Made from 316L by Selective Laser Melting (SLM). Materials 2020, 13, 2204. https://doi.org/10.3390/ma13092204

AMA Style

Płatek P, Sienkiewicz J, Janiszewski J, Jiang F. Investigations on Mechanical Properties of Lattice Structures with Different Values of Relative Density Made from 316L by Selective Laser Melting (SLM). Materials. 2020; 13(9):2204. https://doi.org/10.3390/ma13092204

Chicago/Turabian Style

Płatek, Paweł, Judyta Sienkiewicz, Jacek Janiszewski, and Fengchun Jiang. 2020. "Investigations on Mechanical Properties of Lattice Structures with Different Values of Relative Density Made from 316L by Selective Laser Melting (SLM)" Materials 13, no. 9: 2204. https://doi.org/10.3390/ma13092204

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