Michael Kirka¹, Patxi Fernandez-Zelai¹, Donovan Lenord¹, Obed Acevedo¹, Peeyush Nandwana¹, Andres Marquez Rossy¹; ¹Oak Ridge National Laboratory

Additive manufacturing offers tremendous advantages to the design of critical gas turbine engine components with the opportunity to increase operational performance of the engines on the component and system levels. However, in the case of Ni-base superalloys, understanding the creep and fatigue mechanisms at temperature are of extreme need, as these are the loading conditions that most clearly simulate service conditions in gas turbine engines. This talk will focus on the deformation mechanisms operating during high temperature creep and fatigue of Ni-base superalloys processed through electron beam melting. Specifically, to be discussed are the high gamma prime forming Ni-base superalloys (e.g. Inconel 738/MarM247) processed through EBM and compared to the cast counterparts. Based on currently available results, these materials have been shown to be superior in fatigue compared to the cast counterparts, however, have shown some variability in performance in creep compared to the cast variants.