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范志东,李季,王栋,楼琅洪,张建.取向偏离度对镍基单晶高温合金DD10低周疲劳行为的影响[J].稀有金属材料与工程(英文),2018,47(1):1~6.[fan zhidong,liji,wangdong,loulanghong,zhangjian.Orientation Dependence of Low Cycle Fatigue Properties of a Ni-based Single Crystal Superalloy DD10[J].Rare Metal Materials and Engineering,2018,47(1):1~6.]
Orientation Dependence of Low Cycle Fatigue Properties of a Ni-based Single Crystal Superalloy DD10
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Received:December 12, 2016  Revised:February 07, 2017
Key words: single crystal superalloy, DD10 alloy, orientation deviation, low cycle fatigue  
Foundation item:NSFC(No. 51631008 and 51101160)
Author NameAffiliationE-mail
fan zhidong Xi’an Thermal Power Research Institute Co fanzhidong@tpri.com.cn 
liji 西安热工研究院有限公司  
wangdong 中国科学院金属研究所  
loulanghong 中国科学院金属研究所  
zhangjian 中国科学院金属研究所  
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      Low cycle fatigue (LCF) properties of a nickel-based single crystal (SX) superalloy DD10 with different orientation deviation angles from the [001] axis was investigated at 760 °C and with invariable total strain amplitude of 1.4%. Results reveal that the LCF behavior of DD10 exhibited a strong orientation-dependence. The fatigue life decreased apparently with the increment of the orientation deviation angle. For specimens with the same orientation deviation angle from the [001] axis, those on the [001]-[011] boundary exhibited a longer fatigue life than ones on the [001]-[11] boundary. It was found that the orientation-dependence of fatigue life stems from the difference of accumulated plastic deformation per cycle. On the other hand, both of total stress amplitude and plastic strain amplitude showed a reverse orientation-dependence compared with the fatigue life. However, the orientation deviation showed no influence on the model of fatigue crack initiation and subsequently propagation.