Analysis of the powder material and the structure of samples obtained from an aluminum alloy by selective laser melting

Abstract

By selective laser melting, samples were synthesized from the powder material of the AlSi10Mg alloy. All samples are made of aluminum alloy metal powder. Granulometric analysis data and particle morphology were studied to determine the suitability of the powder used in the selective laser melting. To identify structural defects, the samples were polished from the end and from the side of the building platform. Using a metallographic microscope, the porosity of samples made at a flow rate from 7.28 * 105 to 2.23 * 106 was analyzed. The geometric shape matching of the initial three-dimensional model was analyzed using the holes in the samples as an example. The results of particle size analysis, sphericity of particles of powder material, as well as metallographic analysis of samples can be used to improve the performance of parts obtained from AlSi10Mg aluminum alloy by selective laser melting.

Distribution of laser radiation in opaque porous media

“…Selective laser melting is a rapidly developing technology for manufacturing parts [1][2][3][4][5][6]. The main processes in selective laser melting (SLM) are the absorption and scattering of laser radiation, the transfer of laser radiation energy to the granules of the powder material, the melting of the powder material, wetting by the melt and solidification of the melt [7][8][9]. The totality of the contribution of each of these processes essentially determines the thermal regime of the construction of the part.…”

Research of the physical and mechanical properties of AISI 321 steel manufactured by selective laser melting

“…Despite the popularity of selective laser melting, there are a number of problems due to significant temperature gradients and suboptimal technology regimes, and the formation of defects is possible. The main defects in selective laser melting are roughness [4][5][6], pore formation, deformations and cracks [7][8][9][10]. The factors influencing the appearance of defects during selective laser melting are the geometric characteristics of the part [10], effective heat removal, the position of the part on the substrate, the thermophysical properties of the powder material [12,13], the effect of the ambient temperature [14,15].…”