Process conditions of wire-feed electron beam additive manufacturing for the formation of second-generation nickel-based superalloy macrostructure
摘要
In the work, samples of the second-generation heat-resistant nickel-based superalloy are fabricated by wire-feed electron beam additive manufacturing (EBAM) using various process and heat removal conditions. It is shown that the macrostructure with alternating heat-affected zones (layers) and melting zones (layer boundaries), changes periodically, depending on the frequency the layer deposition. It is found that the higher deposition rate increases the frequency of the periodic thermal effect and reduces the average layer thickness. The layer boundaries do not significantly differ in the structure and phase composition that can affect the mechanical properties of the fabricated samples.