Abstract
The paper presents some investigation results of the material porosity of the samples made using the techno-logy of selective electron beam melting from the Ti-6Al-4V alloy powder. The influence of hatching mode parameters on the porosity of samples was carried out using optical microscopy and X-ray computed tomography. A qualitative and quantitative assessments of the shape and size of pores have been made, and technological factors contributing to their appearance have been identified. It has been established that discontinuities of large sizes are formed mainly in the area of overlapping contouring and hatching zones at a distance of 0.2÷2 mm from the sample surface. Selective selection of pores in the surface layer was not detected. It was found that in the range of linear electron beam energy densities of 180÷300 J/m, the minimum porosity is achieved within that range.
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