摘要
镍基单晶/柱晶高温合金具有高温强度高、抗氧化性强、抗疲劳性能优异等优点,是目前先进航空发动机涡轮叶片的主要材料。超高周疲劳(疲劳寿命>10^(8))是涡轮叶片在服役中后期面临的主要问题。对镍基单晶/柱晶高温合金的超高周疲劳进行综述,分析结果表明,单晶/柱晶高温合金在高温下存在反常屈服现象;对比不同频率下的疲劳研究,未发现明显的频率效应;分析断裂机理,发现裂纹主要从内部孔洞等铸造缺陷处萌生。总结了疲劳寿命预测模型,展望了镍基单晶/柱晶高温合金超高周疲劳的发展方向。
As the current main material for advanced aero-engine turbine blades,nickel-based single crystal/directionally solidified superalloys have high high-temperature strength,strong oxidation resistance and excellent fatigue resistance.Very-high cycle fatigue(fatigue life>10^(8))is the major problem faced by turbine blades in the middle and late stages of service.This article reviews the very-high cycle fatigue of nickel-based single crystal/directionally solidified superalloys.The analysis results show that single crystal/directionally solidified superalloys have abnormal yielding phenomena at high temperature;comparing fatigue studies at different frequencies finds no obvious frequency effect;analyses of fatigue mechanism find that cracks mainly originate from casting defects such as pores.Finally,the fatigue life prediction model is summarized,and the trends of very high cycle fatigue of nickel-based single-crystal and directionally solidified superalloys are prospected.
作者
李茜
张福禄
赵子华
LI Qian;ZHANG Fulu;ZHAO Zihua(School of Energy and Power Engineering,Beihang University,Beijing 100191,China;School of Materials Science and Engineering,Beihang University,Beijing 100191,China)
出处
《航空学报》
EI
CAS
CSCD
北大核心
2021年第5期106-117,共12页
Acta Aeronautica et Astronautica Sinica
基金
国家科技重大专项(2017-IV-0012-0049)
国家自然科学基金(91860110)。
关键词
镍基单晶/柱晶高温合金
超高周疲劳
疲劳机理
疲劳性能
寿命预测
nickel-based single crystal and directionally solidified superalloys
high cycle fatigue
fatigue mechanism
fatigue properties
life prediction
