Microstructures and mechanical properties in powder-based additive manufacturing of a nickel-based alloy

In powder-blown additive manufacturing, the microstructure and mechanical characteristics of the deposited layers are influenced greatly by the process parameters used. The microstructures and mechanical properties of the 1718 nickel alloy processed by additive manufacturing were investigated in this research. The samples were subsequently used to prepare metallographic specimens for observations by optical microscopy and scanning electron microscopy, and hardness test. It was found that the fine equiaxed grains are presented in the build and side surface. There is no difference of the microstructure along the build direction. Subsequently, the hardness is uniform along the thickness and the value is around 260 HV. The potential application includes imitation jewelry and holloware.