INVESTIGATION OF THE INFLUENCE OF SPECIMEN MANUFACTURING PARAMETERS BY THE SELECTIVE LASER MELTING (SLP) METHOD AND COMPARATIVE STUDIES OF THE MECHANICAL PROPERTIES OF ALUMINUM ALLOY AlSi10Mg

Abstract

Purpose. To work out the modes of manufacturing samples from aluminum alloy AlSi10Mg with a layer thickness of 40 microns using SLP technology, studying their mechanical properties, and comparing them with the traditional method of production. Research methods. To determine the structural state of  alloys, optical microscopy was used, granulometric analysis was performed using a scanning electron microscope, mechanical properties were determined according to the standard method using a tearing machine; porosity was determined based on the results of microstructural analysis as a percentage of the area occupied by pores. Results. It was established that when the scanning speed is increased to 1200 mm/s, the distance between the tracks plays a significant role in obtaining high density. From the analysis of mechanical properties, it was established that the samples made by SLP technology have a higher value of tensile strength by 28%, and smaller plastic characteristics (relative elongation and relative reduction) by 17.4% and 31.7%, respectively, compared to the traditional production method. Scientific novelty.  The dependence of the change in the density of the experimental samples made by the SLP technology with AlSi10Mg on the manufacturing parameters is shown. It was established that at a scanning speed of 1000...1100 mm/s, the pore size is on average from 2...7 μm and for samples made at a scanning speed of 1200 mm/s - from 1 to 5 μm. Practical value.  Application of the obtained results will lead to the manufactured parts with increased strength characteristics.