The fabrication of surface structures in the micron and sub-micron ranges on additive manufactured samples represents a significant challenge due to the poor surface quality (high initial roughness) which is inherent to the process (in case of powder-bed fusion method). Post-processing steps are required to enhance the quality of the fabricated parts. This works presents the fabrication of repetitive line-like patterns on previously laser polished AM parts in both titanium and aluminum alloys, using Direct Laser Interference Pattering (DLIP). Variation of process parameters lead to the production patterns with different homogeneities, being the last evaluated using the Gini coefficient.[1,2]

DLIP Structures with a 6.0 µm and aspect ratios close to 1 and ~0.6 are reported for titanium and aluminium alloys, respectively. The optimum process control window of parameter combinations for high surface quality was identified and will be applied to 3D demonstrators, to analyse the influence of the working position (focal distance) on the quality of the produced line-like structures.