National University of Science and Technology “MISiS” (Moscow, Russia):

A. Ya. Travyanov, Cand. Eng., Director of the Institute of Ecological Technologies and Engineering (EcoTech), E-mail: trav@misis.ru
P. V. Petrovskiy, Cand. Eng., Deputy director of EcoTech
V. V. Cheverikin, Cand. Eng., Senior Researcher

“Science and innovations” JSC (Moscow, Russia):
A. V. Dub, Dr. Eng., 1^st Deputy General Director

Additive technologies make it possible to manufacture metal products of complex shape, including those containing cellular structures, which reduce the weight of the product and give it special properties. At present, the method of selective laser melting is one of the key directions for research, since the use of this technology differs in the cheapness of technology and the possibility to obtain products of almost any shape, on the one hand, and the presence of many unexplored aspects in the technology of production and the structure formation of a material, on the other. In this paper, we present the results of investigations on the microstructure and mechanical (tensile) properties for cellular structures of the BCT (body-centered tetragonal) type of various configurations from 03Kh16N15M3 steel, whose CAD models were prepared using Russian specialized software for topological optimization and manufactured using the selective laser melting technology on the Russian apparatus MeltMaster3D550. It is shown that the values of mechanical properties depends on the confi guration of the cells, on the diameter of the struts and, accordingly, on the volume of voids. With the use of honeycomb structures of a BCT + X, Y, Z type, the maximum value of properties is achieved: with the void volume of 65% (the strut diameter 0.5 mm), the tensile strength is 38%, and the yield strength is 49% of those for the bulk sample.

The study was done under support of the RF Ministry of Education and Science within the agreement № 14.578.21.0210 dated 03.10.2016, unique number REMEFI57816x0210.

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