High Temperature Fatigue Crack Growth Behavior and Model of a Nickel-Based Powder Metallurgy Superalloy

被引：0
|
作者：
Wan Y.-W. [1 ,2 ]
Zhou B. [1 ,2 ]
Hu X.-T. [1 ,2 ]
Jiang R. [1 ,2 ]
Song Y.-D. [1 ,2 ]
Guo Z.-W. [3 ]
Li J.-L. [3 ]
机构：
[1] Jiangsu Province Key Laboratory of Aerospace Power, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing
[2] Key Laboratory of Thermal Environment and Thermal Structure, MIIT, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing
[3] AECC Shenyang Engine Research Institute, Shenyang
来源：
Tuijin Jishu/Journal of Propulsion Technology | 2023年 / 44卷 / 02期
关键词：
Crack growth rate model; Fatigue crack propagation; Fracture analysis; High temperature conditions; Load ratio; Nickel-base powder metallurgy superalloy;
D O I：
10.13675/j.cnki.tjjs.210581
中图分类号：
学科分类号：
摘要：
The high temperature fatigue crack growth test of a nickel-based powder metallurgy superalloy material used in turbine disk was carried out. The influence of temperature，load ratio and Compact Tension （CT）specimen thickness on the fatigue crack growth behaviour was analysed，and the crack growth rate model considering the influencing factors was established and evaluated. The results show that the fatigue crack growth rate increases significantly with the increase of temperature and load ratio，and the thickness of CT specimen has little effect on the growth rate. By observing the fracture section，it is found that there is no significant correlation between the fatigue crack propagation mechanism and temperature in the range of 500 ~ 700℃，while the crack propagation section is rougher under the condition of high load ratio at 700℃. A temperature dependent fatigue crack growth rate model is proposed，which can better describe the fatigue crack growth curves at different temperatures. The application effects of Walker model and Newman crack closure model are compared. It is found that Walker model is better in describing the crack growth rate under different load ratios. © 2023 Journal of Propulsion Technology. All rights reserved.
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