Independent effects of laser power and scanning speed on IN718's precipitation and mechanical properties produced by LBPF plus heat treatment

The laser energy density was believed to control microstructure and mechanical properties of additive-manufactured Inconel 718 (IN718) alloy. However, in this study, remarkable differences were found the microstructures, tensile properties, fracture surfaces industrial IN718 alloy (with densities higher than 99.75%), which fabricated by Laser Powder Bed Fusion (LPBF) processes with almost identical same standard heat treatment. results show that these deviations are primarily ascribed independent effects power scanning speed during LPBF-processes on precipitation reasons for variations discussed based thermal history melt pool pre-solidified layer LPBF-process, further analyzed supported computational fluid dynamics simulation finite volume method.