Research Progress on High-cycle Fatigue of Nickel-based Cast Superalloys
High-temperature components in aero-engines and gas turbines work under harsh conditions,such as high temperature,high pressure,high vibration and other complex working conditions.Under these conditions,alloys for high-temperature components need to maintain good mechanical properties for a long time.Nickel-based cast superalloys are widely used for high-temperature parts and components in aero-engines and gas turbines.Their stability and mechanical properties at high temperature are important factors to ensure long-term safe operation of these components.In the complex environment such as high temperature and high pressure,alloy materials will be subjected to repeated stress,resulting in fatigue damage.High-cycle fatigue is one of the main factors that lead to the failure of nickel-based superalloys.Because of repeated loading under high stress,microscopic cracks gradually expand in the materials,and their service life is greatly affected.Therefore,the research on high-cycle fatigue properties of nickel-based superalloys is particularly important.The occurrence of high-cycle fatigue is related to many factors,including the microstructure,stress level and surface defects of the alloys as well as test conditions.In the present work,the differences of high-cycle fatigue mechanisms of nickel-based cast superalloys at different temperature,and the rules and characteristics of different failure states and their effects on high-cycle fatigue of the alloys were discussed,which is of guiding significance for studying the service life rules of blade materials,improving their service time and reducing their research and development cycle.
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