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Mounting on a body during the powder bed process is a way to save manufacturing time and costs while still producing individual and complex components. However, components in the powder bed process are always manufactured with an allowance in order to compensate for inaccuracies in the process by means of subsequent production steps. Accordingly, hybrid components must also be reworked. This publication presents the results of investigations into the influence of the transition from conventional to an additive microstructure during the machining of hybrid samples. For this purpose, samples of 316L, IN718 and Ti-6Al-4V were printed on the corresponding conventionally produced samples. The first half of the samples were machined directly after being manufactured in the LPBF process, while the second half passed a heat treatment step before being machined. The machining tests were performed in orthogonal cutting with variation of uncut chip thickness and cutting speed. The chip formation, the cutting and passive forces, the surface roughness, the microstructure and the hardness are analyzed and compared. The measurement of the process forces showed a difference between the conventional and the additive areas for all materials examined, even after heat treatment. In contrast, the roughness profiles as well as the microstructure and the measured hardness of the conventional and the additive area could be approximated by heat treatment.

Machining of Hybrid (Conventionally and Additively) built 316L, IN718 and Ti-6Al-4V Specimen *