引用本文:王欣,许春玲,胡轶嵩,马世成,汤智慧.中温时效对喷丸单晶合金组织与疲劳性能的影响[J].中国表面工程,2022,35(4):232~237
Wang Xin,Xu Chunling,Hu Yiesong,Ma Shicheng,Tang Zhihui.Effects of Medium Temperature Aging on Microstructure and Fatigue Property of Shot Peened Single Crystal Superalloy[J].China Surface Engineering,2022,35(4):232~237
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中温时效对喷丸单晶合金组织与疲劳性能的影响
王欣1,2, 许春玲1,2, 胡轶嵩3, 马世成1,2, 汤智慧1,2
1.中国航发北京航空材料研究院表面工程研究所 北京 100095;2.中国航发北京航空材料研究院航空材料先进腐蚀与防护航空重点实验室 北京 100095;3.中国航发沈阳发动机研究所制造技术中心 沈阳 110015
摘要:
单晶合金零件喷丸后的工序里存在中温时效过程，将对喷丸表层组织和性能产生影响。采用扫描电镜、截面硬度梯度等方法研究一种中温时效方法对 DD5 单晶合金组织状态的影响，对比原始、喷丸和喷丸+中温时效后单晶合金旋转弯曲疲劳性能。结果表明，喷丸使得 DD5 单晶合金的立方化组织发生剧烈形变，中温时效后剧烈形变组织发生一定的回复，但仍保留了喷丸形变组织特征，原先喷丸硬化层深度由喷丸状态的 270 μm 减小到 180 μm，表面硬度略上升 3.9%。喷丸+中温时效后，相比磨削状态 DD5 单晶缺口旋弯试样 500 MPa / 650 ℃中值疲劳寿命估计量提高 8.29 倍，最短寿命(3.58×105 周次) 高于原始试样的最长寿命(2.84×105 周次)，仍然实现强化，但疲劳寿命分散度增大，同时喷丸+中温时效后试样疲劳极限较磨削提高 11.2%。
关键词:  单晶合金  喷丸  中温时效  疲劳性能
DOI：10.11933/j.issn.1007-9289.20210516001
分类号:TG668;TG13
基金项目:国家科技重大专项资助项目(J2019-VII-0015-0155)
Effects of Medium Temperature Aging on Microstructure and Fatigue Property of Shot Peened Single Crystal Superalloy
Wang Xin1,2, Xu Chunling1,2, Hu Yiesong3, Ma Shicheng1,2, Tang Zhihui1,2
1.Surface Engineering Institution, AECC Beijing Institute of Aeronautical Materials, Beijing 100095 , China;2.Aviation Key Laboratory of Advanced Corrosion and Protection on Aviation Materials, AECC Beijing Institute of Aeronautical Materials, Beijing 100095 , China;3.Manufacturing Technology Center, AECC Shenyang Engine Research Institute, Shenyang 110015 , China
Abstract:
There is a medium temperature aging process after shot peening of single crystal superalloy parts, which may have an impact on the surface structure and performance of shot peening. The effects of a medium-temperature aging on the microstructure of DD5 single crystal superalloy are investigated by scanning electron microscopy and cross-sectional hardness gradient, and the rotating bending fatigue properties are compared with the original, shot peened and shot peened+medium-temperature aging. The results show that the cubic structure of the DD5 single crystal superalloy severely deformed by shot peening, while the deformed structure recovered to a certain extent by the medium-temperature aging. However, the characteristics of the shot peening deformed structure still retains, making the original shot peening hardened layer depth reduce from 270 μm to 180 μm and the surface hardness increased slightly by 3.9%. After shot peening+medium-temperature aging, the estimated fatigue life of 500 MPa / 650 median fatigue life ℃ of grinded DD5 single crystal notched specimen is increased by 8.29 times, and the shortest life (3.58×105 cycles) is higher than the longest life of the original specimen (2.84×105 cycles), indicating that the strengthening is still achieved, but the fatigue life dispersion is increased. Moreover, the fatigue limit of the sample after shot peening+medium temperature aging is increased by 11.2% compared with grinding.
Key words:  single crystal superalloy  shot peening  medium-temperature aging  fatigue property
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