The EIFS-based fatigue life prediction approach of nickel-based single crystals with film cooling holes at elevated temperature

被引：10
作者：
Li, Fei [1 ]
Wen, Zhixun [1 ]
Wu, Ziyan [1 ]
Li, Zhenwei [2 ]
Pei, Haiqing [1 ,3 ]
Yin, Qian [1 ]
Mao, Qianzhu [4 ]
Yue, Zhufeng [1 ]
机构：
[1] Northwestern Polytech Univ, Sch Mech, Civil Engn & Architecture, Xian 710072, Peoples R China
[2] Tongji Univ, Sch Aerosp Engn & Appl Mech, Shanghai 200092, Peoples R China
[3] South China Univ Technol, Sch Civil Engn & Transportat, Guangzhou 510640, Peoples R China
[4] Northwestern Polytech Univ, Sch Civil Aviat, Xian 710072, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2023年 / 166卷
基金：
中国国家自然科学基金;
关键词：
EIFS; Nickel -based single crystal; Surface integrity quantification; Film cooling holes; Fatigue life prediction; HIGH-CYCLE FATIGUE; CRACK-GROWTH ANALYSIS; BEHAVIOR; SUPERALLOY; PROPAGATION; PLASTICITY; MICROSTRUCTURE; INITIATION; THRESHOLD; MODEL;
D O I：
10.1016/j.ijfatigue.2022.107272
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
In this study, a new framework for the fatigue life prediction of nickel-base single crystal (SX) superalloys with different drilling film cooling holes (FCHs) at high temperatures (900 degrees C and 980 degrees C) is investigated based on surface integrity quantification and fracture mechanics. For all the tested SX superalloys with anisotropy (smooth and FCHs specimens), the initial damage state is regarded as the equivalent initial flaw size (EIFS) that is independent of the specimens and hole geometry in the same drilling, and the rationality of EIFS is verified for the first time by conducting numerous fatigue tests and comprehensive surface integrity analysis. Subsequently, the fatigue crack path and microstructure of different specimens at different temperatures are analyzed to reveal the crack initiation mechanism and propagation modes, and a new equivalent stress intensity factor, Delta Keq, is proposed to describe the crack propagation driving force. The EIFS and Delta Keq are combined, and a fatigue crack growth rate (FCGR) with better fit is obtained to comprehensively reflect the different fracture modes (the mixture of Stage I and Mode I). Finally, based on the experimental observation and FCGR description, the fatigue life of the FCHs structure at room and high temperature is predicted to be 3-5 times the dispersion zone of the total fatigue life, and the ultimate defect length is proposed to guide the engineering practices.
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页数：18
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