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In order to reduce CO2 emission and improve the efficiency of power generation, the steam temperature in A-USC (Advanced-Ultra Super Critical) is going to be elevated higher than 700oC(1). Therefore, the heat-resistant materials used in A-USC should be replaced from conventional ferritic steels to new materials such as nickel-base super-alloys. Alloy 625 is an outstanding candidate alloy[1] for boiler tube and pipes of A-USC power plants due to its superior mechanical properties at elevated temperatures. However, it has been reported that the effective lifetime of Ni-base alloy decreased drastically under the random change of output of power plants in order to assure the stable power supply with various renewable energies. Therefore, it is very indispensable for developing a quantitative method for evaluating the total damage of heat-resistant materials under complicated creep-fatigue loading conditions for assuring the safe and reliable operation and its long-term reliability.

Degradation Mechanism of Grain Boundaries in Nickel-Based Alloy 625 Under Creep-Fatigue Loadings at Elevated Temperatures