Modeling of environmentally assisted intergranular crack propagation in polycrystals

Abstract Polycrystalline nickel‐based superalloys experience accelerated intergranular crack growth when exposed to dwell times in oxygen‐rich environments and a combination of high temperature tensile mechanical loading. Increasing rates are observed for increasing amounts environmental oxygen certain concentration range, while below above that range remain approximately constant. A fully coupled chemo‐mechanical modeling framework accounting the degradation grain boundaries by has been presented authors. In this work, we expand moving boundary condition capture realistic flux cracks both edge connected environment interior cracks. numerical simulation results, behavior is shown propagation through polycrystal subjected cyclic Finally, capabilities qualitatively predict dependence average rate on content, load level, time evaluated it predictions agree with experimental observations fracture.