Effect of Stress Ratio on the Fatigue Crack Propagation Behavior of the Nickel-based GH4169 Alloy
来源期刊：Acta Metallurgica Sinica2017年第9期
论文作者：Shen Ye Jian-Guo Gong Xian-Cheng Zhang Shan-Tung Tu
文章页码：809 - 821
摘 要：The fatigue crack growth behavior of the newly developed GH4169 nickel-based alloy at a maximum stress of700 MPa and different stress ratios was investigated in the present work employing the specimens with a single micronotch at a frequency of 129 Hz at room temperature. The results demonstrate a typical three-stage process of fatigue crack propagation processing from the microstructurally small crack（MSC） stage to the physically small crack（PSC） stage, and finally to the long crack stage. The crack growth rate in the MSC stage is relatively high, while the crack growth rate in the PSC stage is relatively low. A linear function of crack-tip reversible plastic zone size was proposed to predict the crack growth rate, indicating an adequate prediction solution.
Shen Ye1，Jian-Guo Gong1，Xian-Cheng Zhang1，Shan-Tung Tu1
1. Key Laboratory of Pressure Systems and Safety, Ministry of Education, School of Mechanical and Power Engineering,East China University of Science and Technology
摘 要：The fatigue crack growth behavior of the newly developed GH4169 nickel-based alloy at a maximum stress of700 MPa and different stress ratios was investigated in the present work employing the specimens with a single micronotch at a frequency of 129 Hz at room temperature. The results demonstrate a typical three-stage process of fatigue crack propagation processing from the microstructurally small crack（MSC） stage to the physically small crack（PSC） stage, and finally to the long crack stage. The crack growth rate in the MSC stage is relatively high, while the crack growth rate in the PSC stage is relatively low. A linear function of crack-tip reversible plastic zone size was proposed to predict the crack growth rate, indicating an adequate prediction solution.
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