Mechanical Properties of Inconel 718 Alloy Produced Using Selective Laser Melting Technology with Dynamic Focusing on Application Surface

The technology of selective laser melting is one of the modern methods of manufacturing parts of complex geometry, which are difficult to reproduce in the conditions of traditional production. When focusing the laser beam on the surface of the construction platform, there is a problem of defocusing the laser beam when it deviates from the center of the platform. One of the ways to ensure stable parameters and print quality is the method of dynamic focusing when moving the optical system along the Z axis. The experiment was performed on an Alfa-280 3D printer (ALT Ukraine LLC), equipped with two scanning systems with single-mode fiber ytterbium lasers. The influence of the location on the platform of test samples made of heat-resistant Inconel 718 alloy on their mechanical properties was studied. It was established that the mechanical properties (temporal resistance, relative elongation, relative narrowing) of samples located in the corners of the platform differed in values from 1 to 38% due to the displacement of the beam defocusing area. When manufacturing products, it is recommended to place them as close as possible to the axis of the optical system.