Investigation of damage mechanisms and short fatigue crack growth during thermomechanical fatigue loading of the nickel?based superalloy Inconel 100

Growing demands on gas turbines, meaning lower consumption and higher efficiency, is accompanied by temperatures inside the turbine. Better lifetime prediction concepts for thermomechanical fatigue (TMF) loading of turbine components are needed to ensure safe operation. The influence TMF history—either in-phase (IP) or out-of-phase (OP)—on crack initiation short growth studied cast nickel-based super alloy IN100, which commonly used as blade material. Therefore, smooth specimens loaded at two different mechanical strain levels with, respectively, phase relationships, using a temperature cycle T = 300–950°C 300–850°C. replica technique detect cracks in order tens micrometers. differences conditions development length evolving from multiple investigated.