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The surface quality of components manufactured by Selective Laser Melting is strongly affected by various process parameters. In this study, we focus on the influence of laser power and scanning speed on the surface roughness of test components made of the nickel-based alloy Inconel 625. We find that a superior surface roughness RZ of about 155 μm can be achieved with a laser power level of 250 W, an exposure time of 50 μs and a point distance of 40 μm. Even small deviations from these optimized parameters may significantly alter the surface quality in the form an increased surface roughness and the appearance of a balling effect and splatter.

Characterization of Surface Quality for Inconel 625 Components Manufactured by Selective Laser Melting