Analysis of Structure and Mechanical Properties of Co–Cr–Mo Alloy Obtained by 3D Printing

Resumo

Abstract—A comparative study was performed of microstructure and strength characteristics of the Co–Cr–Mo alloy obtained by the additive manufacturing (AM) method using selective laser melting (SLM) in the EOSINT M280 3D printer and by arc melting in a helium atmosphere. The occurrence of a martensitic transformation in SLM samples was detected. It was found by nanoindentation that the microhardness H_IT of the SLM alloy is higher than that of the cast alloy, which is likely due to the high level of surface residual stresses in the SLM sample. It was found that the SLM alloy has a two-phase (fcc + hcp) structure after standard annealing, in contrast to the cast alloy, which retains a single-phase fcc structure after such annealing.