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王欣,张涛,黄朝晖,汤智慧,赵振业.喷丸对一种单晶合金表面完整性和高温缺口疲劳性能的影响[J].稀有金属材料与工程(英文),2018,47(6):1668~1676.[Wang Xin,Zhang Tao,Huang Zhaohui,Tang Zhihui and Zhao Zhenye.Effect of shot peening on the surface integrity and notched fatigue properties of a single-crystal superalloy at elevated temperature[J].Rare Metal Materials and Engineering,2018,47(6):1668~1676.]
Effect of shot peening on the surface integrity and notched fatigue properties of a single-crystal superalloy at elevated temperature
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Received:September 10, 2016  Revised:June 17, 2017
DOI:
Key words: high cycle fatigue  shot peening  single crystal superalloy  disorientation
Foundation item:航空科学基金(2015Z02117)
Author NameAffiliation
Wang Xin,Zhang Tao,Huang Zhaohui,Tang Zhihui and Zhao Zhenye  
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Abstract:
      The surface integrity and notched fatigue property of a shot-peened single crystal superalloy were investigated. The surface texture of the peened material was determined using a white light interferometer, while the microstructural characterization was performed using a scan electron microscopy, high resolution transmission electron microscopy from the plane and cross-section view directions, micro-hardness tester and electron backscatter diffraction. The gains, expressed in term of high temperature fatigue limit, were established by rotating-bending fatigue tests and discussed in relation to the microstructure evolution in the shot peening states. This revealed that the beneficial effect provided by shot peening is more than 14.8% against as-machined in a temperature ranging from 760℃ to 850℃ because of the high-density tangled dislocation, cold work and disorientation. Furthermore, the stress concentration coefficient is reduced by the shot peening procedure while the average profile height Ra increases according to the calculation of the surface stress concentration.