Investigation of the influence of geometry and technological parameters of production on the structure and properties of spherical cellular structures obtained by selective laser melting

Abstract

In this work, we studied the SLM process of obtaining spherical cellular structures from corrosion-resistant steel 03X16H15M3 (316L). The dependences of the microstructure and mechanical properties on the geometry and scanning strategy were studied for spherical cellular structures of 2 types: "Hollow spherical unit cell" with a calculated volume of voids of 69% and "Spherical unit cell" with a calculated volume of voids of 50%. Sample size was 10x10x10 mm. Investigations of the influence parameters of the laser scanning strategies have revealed the dependence of spherical geometry cellular structures and properties of the samples from the scanning strategy. A different course of the deformation curves and different values of the yield strength are obtained depending on the geometry and growth mode of spherical cellular structures. The minimum value of the yield strength is showed by a sample with a volume of voids equal to 60%. Comparison of the cellular structures of other samples with a difference in the volume of voids of 10%, resulting from the use of different strategies and modes of laser processing, showed that the yield strength of the samples may differ 1.5 times with the same initial geometry CAD model.