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The wear and erosion behavior of additively manufactured maraging steel with built orientations of 0°, 45° & 90° were investigated and compared with conventional (cast and hot rolled) samples. The as-built and heat-treated samples were wear-tested at various loads of 20N, 40N & 80N, at constant disc speed and for specific sliding distance. Erosion test was performed at 90° impingement angle for 40 min at erosion discharge rate of 4.5 g/min, wear rate was found increasing with the increase in load from 20N to 80 N, and was found affected by build orientation, mainly in the as-built additive samples. In both, as built as well heat-treated conditions, 90° oriented samples were found more wear-resistant, and wear resistance of the samples, following heat treatment, was relatively higher. Coefficient of friction (COF) decreased with increase in load, in both as built as well heat-treated conditions. Erosion resistance of the 0° AB and 0° HT samples was higher than that of other build orientations. Prior to heat treatment, erosion resistance of the conventional samples was inferior to that of additive samples, due to comparatively coarser microstructure; however, after the heat treatment, erosion resistance was increased. Wear tested and eroded samples were examined under SEM and AFM. It was observed that at low load of 20 N there was abrasive wear by ploughing, and at high load of 80 N there was adhesive wear, and erosion occurred by lip formation and plastic deformation.

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