This research focuses on analysing the 18Ni300 maraging steel produced through laser
powder bed fusion. Specifically, it aims to examine the phase components using X-ray diffraction, the
microstructure through scanning electron microscopy, and the hardness of the different structures
present in the manufactured material. The primary goal is to meticulously analyse the material and
its microstructures. By doing so, a correlation between the hardness and each structure type, be it
cellular or columnar, can be established. This will allow us to pinpoint any defects in the material
before any surface chemical treatment is carried out and facilitate a thorough examination of its
microstructure. A consistent pattern emerges across the samples through systematic measurement
of microhardness distribution in various locations and detailed examination of the structure. The
findings of the study reveal that the hardness of cellular and columnar structures exhibits a significant
variation based on the location of the measurement about cell boundaries. The hardness value is
notably higher in the combination of cellular and multiple layers, as the data indicat
