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Recently, the high-efficiency gas turbine combined cycle (GTCC) power generation has become essential in operation as a backup power supply of renewable energy sources in Japan. In turbine blades and vanes of the gas turbines operated as a backup power supply GTCC, there is growing concern about the damage due to thermo-mechanical fatigue (TMF) loading because of the expected increased starting/stopping cycle and frequent load fluctuation. This study investigated the small crack propagation behavior of naturally initiated cracks in polycrystalline Ni-based superalloy under in-phase and out-of-phase TMF loading cycles. The effect of the crack closure on small crack propagation behavior was discussed based on the results of the finite element analysis.
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Recently, the high-efficiency gas turbine combined cycle (GTCC) power generation has become essential in operation as a backup power supply of renewable energy sources in Japan. In turbine blades and vanes of the gas turbines operated as a backup power supply GTCC, there is growing concern about the damage due to thermo-mechanical fatigue (TMF) loading because of the expected increased starting/stopping cycle and frequent load fluctuation. This study investigated the small crack propagation behavior of naturally initiated cracks in polycrystalline Ni-based superalloy under in-phase and out-of-phase TMF loading cycles. The effect of the crack closure on small crack propagation behavior was discussed based on the results of the finite element analysis.