Abstract
Flat tensile specimens were produced from IN718 in SLM280 powder bed fusion machine. The specimens were arranged from flat to perpendicular positions on the build plate with 15° intervals. Support structures were used for all samples to facilitate slant printing and minimization of sample distortion. The samples were also post treated by hot isostatic pressing (HIP) to evaluate the effect of elevated temperature and pressure on surface finish quality. The as-print and HIPed surfaces were analyzed for surface roughness and distortion using white light interferometry (WLI). It was observed that the highest surface roughness evolves at 15° samples and HIPing exclusively affected the roughest surfaces, leaving the low roughness surfaces almost intact. Fatigue lifetime simulations suggest that complex components with surfaces at different angles can present inconsistent fatigue behavior.
