Abstract
Brazing is a promising joining technique for nickel-based single-crystal superalloy (Ni-SXs) intended for turbine blades, which endure the creep-fatigue conditions. In this work, the high-temperature microstructural stability and creep-fatigue damage mechanism of brazed joint are studied. The microstructural evolution of brazed joint, especially Zone I, where the creep-fatigue failure occurs, is influenced by the aging duration. The governed creep-fatigue damage mechanism is correlated with the strain amplitude and microstructural evolution in the brazed joints. The results obtained will be beneficial to improve the joining quality of Ni-SX brazed joints used for turbine blades.
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