Study of the structure and mechanical properties of samples obtained by the selective laser alloying technology from the Inconel 738 heat-resistant alloy powder

Abstract

The technology of selective laser melting of heat-resistant alloys is of great interest in the aerospace industry, because it allows you to implement a more complex geometry of parts in comparison with traditional technologies. This paper presents the results of determining the rational technological parameters of scanning a metal powder of a heat-resistant alloy Inconel 738. By statistical processing of experimental data to determine the effect of technological parameters of scanning on the tensile strength of a material, rational technological parameters of scanning are established, namely, the laser radiation power is 325 W, the scanning step is 0,12 mm, scanning speed of 677 mm/s, which corresponds to a bulk energy density of 80 J/mm3. The results of tests of cylindrical samples manufactured at angles of 0°, 30°, 45°, 60° and 90° to the uniaxial tension building platform are presented. A study of the microstructure of the samples was executed.