The Inter-Hole Interference on Creep Deformation Behavior of Nickel-Based Single Crystal Specimen with Film-Cooling Holes

Abstract The inter-hole interference of nickel-based single crystal film-cooling holes specimen during creep deformation were investigated by both experiment and crystal plastic finite element method. The results demonstrated that inter-hole interference promoted the evolution of microstructure, accelerated formation of inter-hole slip zone and accumulation of plastic strain. Based on the above findings, considered the inter-hole interference effect, the existing McClintock model was modified by stress triaxiality, and improved McClintock model provided a relatively good prediction of deformation of film-cooling holes at complex stress state. The influence of inter-hole interference on the fracture failure mode is further studied, of which is mainly achieved by the plastic slip zone between the holes. During fracture progress, it is seen that micro voids and cracks coalesced in this region. Comparing the stripe plastic slip zone observed in experiments and the fracture failure mode of film cooling hole specimen predicted by the finite element method, it was found that the predicted potential fracture paths showed excellent agreement with the experimental results.