Abstract

The paper presents the results of investigating the influence of different additive manufacturing parameters on the microstructural and mechanical properties of the produced metal specimens. Metal specimens were obtained by additive manufacturing (AM) on the PBF-LB machine in steel quality of X2CrNiMo17-12-2 (steel 316L). Visual examination, microscopic analysis, hardness tests and tensile tests were performed. Significant porosity as well as reduced elongation of tensile specimens was observed in specimens manufactured before parameter correction. After adjusting the process parameters i.e. reducing the laser power, scanning speed and hatch spacing, no porosity was observed. Moreover, improved mechanical properties were obtained, which meet the criteria for conventionally produced steel X2CrNiMo17-12-2 as defined by the standard SRPS EN 10088-3. This shows that the material properties of AM metal parts strongly depend on process parameters. In order to ensure a high quality of AM metal parts, it is necessary to perform material characterization (structural and mechanical testing of specimens) after every parameter adjustment.

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