Creep-fatigue behaviour of single-crystal Ni-base superalloy CMSX-8

摘要

The creep-fatigue behaviour of a lower cost, reduced rhenium Ni-base superalloy, CMSX-8, a variant of CMSX-4, cast in a single crystal was experimentally evaluated over a broad range of conditions, from room temperature to 1100 degrees C, and for two loading orientations: and . The fatigue lives depend on the orientation, cycle type, and temperature. The relative importance of these parameters on influencing the life is identified and discussed. From this understanding, a simple life model is constructed to capture the influence of these broad test conditions. The results are compared with those of the higher Re superalloy, CMSX-4.