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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2021, Vol. 42 ›› Issue (5): 524340-524340.doi: 10.7527/S1000-6893.2020.24340

• Review • Previous Articles     Next Articles

Very high cycle fatigue of nickel-based single-crystal and directionally solidified superalloys: Review

LI Qian1, ZHANG Fulu1, ZHAO Zihua2   

  1. 1. School of Energy and Power Engineering, Beihang University, Beijing 100191, China;
    2. School of Materials Science and Engineering, Beihang University, Beijing 100191, China
  • Received:2020-06-01 Revised:2020-08-30 Online:2021-05-15 Published:2020-09-24
  • Supported by:
    National Science and Technology Major Project (2017-IV-0012-0049); National Natural Science Foundation of China (91860110)

Abstract: As the current main material for advanced aero-engine turbine blades, nickel-based single crystal/directionally solidified superalloys have high high-temperature strength, strong oxidation resistance and excellent fatigue resistance. Very-high cycle fatigue (fatigue life>108) is the major problem faced by turbine blades in the middle and late stages of service. This article reviews the very-high cycle fatigue of nickel-based single crystal/directionally solidified superalloys. The analysis results show that single crystal/directionally solidified superalloys have abnormal yielding phenomena at high temperature; comparing fatigue studies at different frequencies finds no obvious frequency effect; analyses of fatigue mechanism find that cracks mainly originate from casting defects such as pores. Finally, the fatigue life prediction model is summarized, and the trends of very high cycle fatigue of nickel-based single-crystal and directionally solidified superalloys are prospected.

Key words: nickel-based single crystal and directionally solidified superalloys, high cycle fatigue, fatigue mechanism, fatigue properties, life prediction

CLC Number: