Abstract
Metal components produced via selective laser melting (SLM) additive manufacturing (AM) can offer comparable and sometimes superior mechanical properties to those of bulk materials. Selection of the appropriate process parameters (e.g. laser power, build direction, scan hatch spacing) plays a fundamental role in determining final properties. For this reason, microstructure, defect formation and mechanical properties of AISI 316L components are investigated in this paper according to the process parameters used for their fabrication. A first experimental campaign establishes process parameters guaranteeing a density greater than 98%. Samples for microstructural and mechanical characterization are then produced based on these results, varying laser power from 100W to 150W, hatch space from 0.05mm to 0.07mm and orientation from 45° to 90°. A MYSINT100 SLM machine with laser power up to 150W and spot diameter of 50μm is employed for all experiments. The presented results establish a correlation between the process parameters and the resulting microstructure and mechanical properties of SLM 316L specimens.
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