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Low-Cycle Fatigue Performance and Fracture Mechanism of Nickel-based Single Crystal Superalloy at 530 °C
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1.Failure Analysis Center of Aero Engine Corporation of China, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China;2.Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation, Beijing 100095, China

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National Science and Technology Major Project (J2019-VI-0022-0138)

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    Abstract:

    The low-cycle fatigue performance and fracture damage mechanism of Ni-based single crystal superalloy were investigated at 530 °C. Results show that at 530 °C, the fatigue crack of the single crystal superalloy generally appears on the surface, sub-surface or inside of the sample. When there are casting defects on the sub-surface, fatigue crack will arise preferentially from the defects. Under the condition of large strain amplitude (>0.85%), the alloy shows obvious cyclic hardening behavior during the fatigue cycle, and the cyclic stress response curve tends to be stable when the strain amplitude is lower than 0.85%. The plastic deformation of Ni-based single crystal superalloy is mainly proceeded by slip. At 530 °C, the fracture of single crystal superalloy is mainly caused by octahedral slip mechanism, and the main slip system is {111} <110>. According to the sectional structure characteristics of the fracture, no obvious plastic deformation occurs near the source area. The characteristic of fatigue striation can be seen in the stable extension of the crack, and a lot of cross slip bands exist at the slip step in the rapid crack extension stage. By electron backscattered diffraction analysis, there are obvious plastic deformation on the fracture surface at the junction of different slip planes, and the γ matrix and cubic γ' phase near the fracture surface are seriously distorted. No obvious oxidation is observed on the surface of fatigue fracture at 530 °C .

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[Zhang Jingang, Chen Xing, Li Zhen, Tian Fuzheng, Liu Xinling. Low-Cycle Fatigue Performance and Fracture Mechanism of Nickel-based Single Crystal Superalloy at 530 °C[J]. Rare Metal Materials and Engineering,2023,52(6):1985~1993.]
DOI:10.12442/j. issn.1002-185X.20221001

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History
  • Received:December 27,2022
  • Revised:June 01,2023
  • Adopted:March 15,2023
  • Online: July 03,2023
  • Published: June 30,2023