| SEM in-situ investigation on fatigue cracking behavior of P/M Rene95 alloy with surface inclusions |
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| 作者姓名： | Xishu Wang Lina Zhang Yanping Zeng Xishan Xie |
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| 作者单位： | [1]School of Aerospace, Tsinghua University, Beijing 100084, China [2]Department of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China [3]Department of Material Science and Engineering, Tsinghua University, Beijing 100084, China |
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| 基金项目： | 国家自然科学基金，The National Basic Research Program of China |
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| 摘 要： | The low-cycle fatigue behavior of powder metallurgy Rene95 alloy containing surface inclusions was investigated by in-situ observation with scanning electron microscopy （SEM）. The process of fatigue crack initiation and early stage of propagation behavior indicates that fatigue crack mainly occurs at the interface between the inclusion and the matrix. The effect of inclusion on the fatigue crack initiation and the early stage of crack growth was very obvious. The fatigue crack growth path in the matrix is similar to the shape of inclusion made on the basis of fatigue fracture image analysis. The empiric relation between the surface and inside crack growth length, near a surface inclusion, can be expressed. Therefore, the fatigue crack growth rate or life of P/M Rene95 alloy including the inclusions can be evaluated on the basis of the measurable surface crack length parameter. In addition, the effect of two inclusions on the fatigue crack initiation behavior was investigated by the in-situ observation with SEM.
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| 关 键 词： | P/M Rene95合金 SEM 失效 粉末冶金 裂纹 |
| 收稿时间： | 2005-02-12 |
SEM in-situ investigation on fatigue cracking behavior of P/M Rene95 alloy with surface inclusions |
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| Xishu Wang Lina Zhang Yanping Zeng Xishan Xie.SEM in-situ investigation on fatigue cracking behavior of P/M Rene95 alloy with surface inclusions[J].Journal of University of Science and Technology Beijing,2006,13(3):244-249. |
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| Authors: | Xishu Wang Lina Zhang Yanping Zeng Xishan Xie |
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| Affiliation: | 1. School of Aerospace, Tsinghua University, Beijing 100084, China;2. Department of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;3. Department of Material Science and Engineering, Tsinghua University, Beijing 100084, China;1. Department of Engineering Mechanics, Center for Nano and Micro Mechanics, and Applied Mechanics Lab, Tsinghua University, Beijing 100084, China;2. Department of Engineering Mechanics, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China |
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| Abstract: | The low-cycle fatigue behavior of powder metallurgy Rene95 alloy containing surface inclusions was investigated by in-situ observation with scanning electron microscopy (SEM). The process of fatigue crack initiation and early stage of propagation behavior indicates that fatigue crack mainly occurs at the interface between the inclusion and the matrix. The effect of inclusion on the fatigue crack initiation and the early stage of crack growth was very obvious. The fatigue crack growth path in the matrix is similar to the shape of inclusion made on the basis of fatigue fracture image analysis. The empiric relation between the surface and inside crack growth length, near a surface inclusion, can be expressed. Therefore, the fatigue crack growth rate or life of P/M Rene95 alloy including the inclusions can be evaluated on the basis of the measurable surface crack length parameter. In addition, the effect of two inclusions on the fatigue crack initiation behavior was investigated by the in-situ observation with SEM. |
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| Keywords: | P/M Rene95 alloy fatigue behavior inclusion powder metallurgy in-situ observation SEM |
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