Volume 36 Issue 12
Dec.  2021
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Article Navigation >  Journal of Aerospace Power  > 2021  >  36(12): 2482-2489
LI Wei, JIANG Kanghe, MA Li, ZENG Wu, YANG Junjie. Low cycle fatigue behavior and life prediction model of TiAl superalloy[J]. Journal of Aerospace Power, 2021, 36(12): 2482-2489. doi: 10.13224/j.cnki.jasp.20210440
Citation: LI Wei, JIANG Kanghe, MA Li, ZENG Wu, YANG Junjie. Low cycle fatigue behavior and life prediction model of TiAl superalloy[J]. Journal of Aerospace Power, 2021, 36(12): 2482-2489. doi: 10.13224/j.cnki.jasp.20210440
shu

Low cycle fatigue behavior and life prediction model of TiAl superalloy

doi: 10.13224/j.cnki.jasp.20210440
  • 1.

    Hunan Aviation Powerplant Research Institute，Aero Engine Corporation of China，Zhuzhou Hunan 412002，China

  • 2.

    Institute of Engineering Thermophysics， Chinese Academy of Sciences，Beijing 100190，China

  • 3.

    Institute of Aero Engine，Tsinghua University，Beijing 100085，China

  • Received Date: 2021-08-11
  • Publish Date: 2021-12-28
    Abstract
  • Axial strain-controlled low cycle fatigue （LCF） tests were carried out on the TiAl superalloy at 400 ℃ and 750 ℃ to obtain the cyclic behavior and LCF lifetime.The superalloy exhibited stable cyclic characteristics，i.e.no obvious cyclic softening or cyclic hardening during test.The cyclic stress-strain relationship was well described by the Ramberg-Osgood equation.LCF lives at different temperatures had a log-linear relationship with the total strain ranges.Fracture morphology revealed that the TiAl superalloy presented pronounced ductile fracture and significant oxidation at 750 ℃，while the brittle fracture of the material was obvious at 400 ℃.Meanwhile，translamellar fracture was dominant for the lamellar microstructure at both temperature，and the percentage of the interlamellar fracture decreased with the strain amplitude.It was noteworthy that oxidation was significantly accelerated at 750 ℃.Compared to the Manson-Coffin model，although the Cruse-Meyer model had simpler mathematical form and fewer material constants，it was not accurate enough to predict the life of the tenon part of turbine blades with lower temperature but heavy centrifugal load.Hence，the model was not suitable to be applied to TiAl turbine blade directly.

     

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