Volume 29 Issue 4
Apr.  2014
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ZHANG Li, HUANG Xin-yue, WU Xue-ren, YU Hui-chen, ZHANG Min, LI Hong-liang. In-situ experiment on early growth of small fatigue crack of nickel-based superalloy GH4169[J]. Journal of Aerospace Power, 2014, 29(4): 901-906. doi: 10.13224/j.cnki.jasp.2014.04.022
Citation: ZHANG Li, HUANG Xin-yue, WU Xue-ren, YU Hui-chen, ZHANG Min, LI Hong-liang. In-situ experiment on early growth of small fatigue crack of nickel-based superalloy GH4169[J]. Journal of Aerospace Power, 2014, 29(4): 901-906. doi: 10.13224/j.cnki.jasp.2014.04.022
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In-situ experiment on early growth of small fatigue crack of nickel-based superalloy GH4169

doi: 10.13224/j.cnki.jasp.2014.04.022

  • 1. Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation, Beijing Institute of Aeronautical Materials, Aviation Industry Corporation of China,Beijing 100095,China;

  • 2. National Key Laboratory of Science and Technology on Advanced High Temperature Structure Materials, Beijing Institute of Aeronautical Materials, Aviation Industry Corporation of China,Beijing 100095,China;

  • 3. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing,Beijing 100083,China

  • Received Date: 2013-04-26
  • Publish Date: 2014-04-28
    Abstract
  • Small fatigue crack initiation and propagation behaviors at room temperature of a directly aged nickel-based superalloy GH4169 were studied by in-situ scanning electron microscope (SEM) fatigue test. The results showed that under tension-tension fatigue loading with R=0.1, small fatigue the crack initiation period was only about 20% of the total fatigue life. Small fatigue cracks initiated at surface inclusions and grew as semi-elliptical surface cracks. The surface crack broke through one side of the specimen and subsequently became a corner crack with fast growth rates, leading to the final fracture. The early growth of small fatigue cracks was strongly affected by the local microstructure of materials, and the scattering of small fatigue crack growth rate was large.

     

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