Effect of Notches on Fatigue Crack Initiation and Early Propagation Behaviors of a Ni-Based Superalloy at Elevated Temperatures

被引：0
作者：
Zhao, Zuopeng [1 ,2 ]
Hu, Xuteng [3 ]
Guo, Zhiwei [4 ]
机构：
[1] Sanjiang Univ, Sch Mech & Elect Engn, Nanjing 210012, Peoples R China
[2] Sanjiang Univ, Nanjing Agr Robot & Equipment Engn Res Ctr, Nanjing 210016, Peoples R China
[3] Nanjing Univ Aeronaut & Astronaut, Coll Energy & Power Engn, Nanjing 210016, Peoples R China
[4] AECC Shenyang Engine Res Inst, Shenyang 110015, Peoples R China
来源：
METALS | 2025年 / 15卷 / 04期
关键词：
nickel-based powder metallurgy; simulation specimen; fatigue crack initiation; small crack; NICKEL-BASED SUPERALLOY; LOW-CYCLE FATIGUE; GROWTH MECHANISMS; CREEP-FATIGUE; MICROSTRUCTURE; INCLUSIONS;
D O I：
10.3390/met15040384
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The role of notch stress and surface defects on fatigue crack initiation and small-crack propagation behavior has been investigated using groove simulation specimens. The naturally initiated small-crack growth tests have been performed on a FGH4099 superalloy at 500 degrees C and 700 degrees C. The findings indicate that elevated testing temperature significantly reduced the proportion of fatigue crack initiation life, with a less pronounced effect on the proportion of life for cracks to grow to First Engineering Crack size. Competing crack initiation modes were observed in the fatigue test of groove simulation specimens. The location of maximum principal stress was dominant fatigue crack initiation sites, and for specimens with surface inclusions, the defect location can also serve as a crack initiation site. Furthermore, crack initiation modes were found to have a more pronounced effect on the small-crack growth rate. A turning point observed in the crack growth rate curves for specimens with multi-site crack initiation was attributed to crack shielding and subsequent coalescence.
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页数：12
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