Low cycle fatigue behavior and life prediction model of TiAl superalloy

被引：0
作者：
Li W. [1 ]
Jiang K. [1 ]
Ma L. [1 ]
Zeng W. [2 ]
Yang J. [3 ]
机构：
[1] Hunan Aviation Powerplant Research Institute, Aero Engine Corporation of China, Zhuzhou
[2] Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing
[3] Institute of Aero Engine, Tsinghua University, Beijing
来源：
Hangkong Dongli Xuebao/Journal of Aerospace Power | 2021年 / 36卷 / 12期
关键词：
Cyclic stress⁃strain relationship; Fracture morphology; Life prediction; Low cycle fatigue(LCF); TiAl superalloy;
D O I：
10.13224/j.cnki.jasp.20210440
中图分类号：
学科分类号：
摘要：
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. © 2021, Editorial Department of Journal of Aerospace Power. All right reserved.
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页码：2482 / 2489
页数：7
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