Selective laser melting of H13 tool steel powder: effect of process parameter on complex part production

This research work presents the investigation of H13 tool steel powder in the production of parts characterized by complex features via selective laser melting. The authors proposed a benchmark geometry with 40 mm nominal height, self-supported overhanging structure and internal channels. To investigate powder printability and process capabilities, an experimental campaign was designed as a function of laser power, scan speed and hatching distance. Full dense parts exhibiting 99.92% internal density have been achieved by imposing a laser power equal to 150 W, a scan speed equal to 500 mm/s and a hatching distance equal to 120 mu m, while high geometrical accuracy in terms of no material drops along sample edges and low-dimensional deviations of the realized sloping surfaces (i.e.,+0.23 degrees and - 0.90 degrees for nominal 35 degrees and 40 degrees overhang, respectively) has been achieved for 150 W, 1000 mm/s, and 100 mu m. Findings open the way to use SLM technology in the design of advanced cutting tool solutions.