Study of the Effect of Growing Modes by Selective Laser Melting Method on Porosity in Copper Alloy Products

The results of the study of the dependence of the porosity of products grown from copper alloy powders by selective laser melting method on the process operating parameters: laser beam scanning speed and the specific energy are presented. The boundaries of the modes that provide the minimum porosity during the formation of a stable single fused path are determined. The granulometric analysis of the powders 99.7% Cu and PR-BrH was carried out using a particle size analyzer (HORI-BALA-350). The measurement range of particles extends from 100 nm to 1000 μm. The analyzer is based on the laser diffraction method; the computational algorithm is designed in accordance with the Mie scattering theory. The radiation source is a laser diode (λ = 605 nm, P = 5 mW), the detector is 64 photodiodes located on a logarithmic spiral, 6 silicon photodiodes are used for backscatter analysis. Microstructure studies were performed using metallographic analysis of transverse thin sections, for which a combined machine for automatic and manual cutting