Abstract
This paper describes an experimental study on crack propagation properties of a single crystal Ni-base superalloy, CMSX-2, under creep-fatigue loading. The following points were made clear : (1) The crack propagation properties of CMSX-2 under creep-fatigue loading were approximately divided into two types, cyclic dependent, PP and PC waves, and time dependent, CP and CC waves, ones similar to those of polycrystalline metals. (2) The result is due to a difference of fracture modes, gamma prime transphase fracture in cyclic dependent crack propagation and gamma prime interphase fracture in time dependent crack propagation. (3) In time dependent crack propagation, the resistance to crack propagation under CP loading was smaller than that under CC loading because of a difference of creep in the process of compression, similar to that in polycrystalline austenitic stainless steel at a high temperature.
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