Development of selective laser sintering of powder compositions of constructional steels

1Kashenkova, AV, 2Kalinina, NE, 3Dzhur, EA
1Oles Honchar Dnipro National University, Dnipro, Ukraine; SE «PA Yuzhny Machine-Building Plant named after A. Makarov», Dnipro, Ukraine
2Oles Honchar Dnipro National University, Dnipro, Ukraine
3Oles Honchar National University of Dnipropetrovsk, Dnipropetrovsk, Ukraine
Space Sci. & Technol. 2019, 25 ;(5):18-24
Publication Language: Ukrainian
Three-dimensional printing implementation is an important stage in the progress of the aircraft industry. The additive production is considered as an alternative to milling, stamping, and casting. The use of 3D printers and bulk scanning will lighten the design of an aircraft and thus reduce fuel and material costs. Stainless steel is used in all spheres of human activity from the food industry to electronics and precision mechanics. AISI 316 steel is used in the manufacture of equipment for the chemical industry as well as for the manufacture of products used in aggressive environments, such as, for example, seawater in cold seas.
The anticorrosion properties of 316L steel are manifested due to the presence of a layer of chromium oxide on the metal surface. This protective layer is very stable, and even after mechanical or chemical damage, it quickly takes its former form, and the anticorrosive properties of the metal remain unchanged.
The technological process has been developed for the manufacture of billets from AISI 316L powder alloy by selective laser sintering. The workpiece heat treatment technology is proposed, which includes homogenization at 860 °C, tempering from 1050 °C, and tempering at 510 °C for 60 min, cooling in air. As a result, specimens were obtained, the structure and mechanical properties of the alloy were investigated, and the technology of thermal processing of billets was developed. It has been proven that 3D-printing can be a full replacement of investment casting. A high set of mechanical properties of powder alloys has been obtained: σv = 725 MPa, δ5 = 42 %, Ψ = 56 %, KCU = 241 J/cm2.
Keywords: 3D-printing, composition, construction steel, laser, model
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