Additive Manufacturing of Compositionally-Graded AISI 316L to CoCrMo Structures by Directed Energy Deposition

In the present study, compositionally-graded structures of AISI 316L and CoCrMo alloy are manufactured by powder-based laser-beam directed energy deposition (DED-LB). Through a process-integrated adjustment powder flow, in situ alloying two materials becomes feasible. Thus, sharp smooth transition with mixture both alloys can be realized. order to investigate phase formation during alloying, simulation approach considering equilibrium calculations is employed. The findings reveal that precise compositional as well functional gradation possible. Thereby, chemical composition directly correlated specimen hardness. Moreover, phases, which identified calculations, also observed experimentally using scanning electron microscopy (SEM) energy-dispersive X-ray-spectroscopy (EDS). Electron backscatter diffraction (EBSD) reveals epitaxial grain growth across region pronounced <001>-texture, while acts nucleus for new grains <101>-orientation. light envisaged applications biomedical sector, investigation demonstrates high potential an 316L/CoCrMo material combination.