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Abstract
The effect of the main parameters of selective laser melting (SLM) on the porosity and microstructure of samples made of a heat-resistant low-alloy alloy based on molybdenum is studied. Morphological and granulometric analysis of powders is carried out before the experiments. Cultivation is carried out on the domestic SLP-250 complex. Samples with a relative density of 99.42 % and no cracks are obtained. Columnar grains are observed in the samples, the maximum length of which reached 500...550 microns. The direction of growth of columnar grains coincides with the direction of the construction of samples. Areas with an equiaxed structure located between adjacent points of intersection of supporting structures and the first layers of samples аre identified. A fi ne-grained columnar structure is observed at the point of direct contact of the supporting structure with the sample. The microhardness of the samples is 370 HV.
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