Study of the structure and mechanical properties of samples produced by the method of selective laser melting from metallic powder of heat-resistant alloy VZH-159 (KHN58MBYU)

This paper presents the results of determining the optimal parameters of selective laser melting (SLM) of the metal powder of the high-temperature alloy VZh-159 (KhN58MBYu). Empirically and using mathematical methods for planning and analyzing experiments to determine the effect of technological parameters of fusion on the tensile strength of the material, rational SLM modes have been established, namely, laser emission power, hatching, scanning speed. The laser power P (X1) and scanning speed v (X2) were chosen as the main variable parameters of the full-factor experimental design, and the tensile strength σB, MPa (Y), was presented as a dependent variable on the selected factors. The mechanical properties of the samples produced by the SLM were determined, which also depended on the volumetric energy density, which is equal to the ratio of the laser power to the product of the scanning speed, hatching, and layer thickness. During the experiment, it was possible to obtain an acceptable quality indicator - mechanical properties, for a certain range of technological parameters of SLM. A study of the microstructure of the material of produced samples of the VZh-159 (KhN58MBYu) heat-resistant alloy was carried out, and chemical and granulometric analysis of the initial powder was carried out.