Sean P. Murray¹, Kira Pusch¹, Andrew Polonsky¹, Chris Torbet¹, Peeyush Nandwana², Michael Kirka², Ryan Dehoff², Ning Zhou³, Stéphane Forsik³, William Slye³, Tresa Pollock¹; ¹University of California, Santa Barbara, ²Oak Ridge National Laboratory, ³Carpenter Technology Corporation

Electron beam melting (EBM) for additive manufacturing offers the possibility of advanced component designs using materials for extreme environments. This process can be thought of as a repetitive micro-welding process, where metallic powders are sintered and joined layer-by-layer under vacuum by an electron beam. Many of the advanced nickel superalloys used in critical areas of the hot section of turbine engines are traditionally considered unweldable due to their tendency to crack upon solidification, which is promoted by their high volume fraction of gamma prime that forms shortly after solidification. Here we present the development of a novel CoNi-base superalloy with high gamma prime volume fraction and inherent oxidation resistance that is amenable to the EBM processing route. Microstructure development in the as-printed and heat-treated conditions will be discussed, as well as the mechanical properties in comparison to other gamma prime containing superalloys currently being considered.