期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 160, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2022.106861
关键词
Powder metallurgy superalloy; Small fatigue crack; Stress ratio; Crack arrest; Grain boundary
资金
- National Science and Technology Major Project [2019-IV-0017-0085]
- National Natural Science of China [12172021, 52105156]
The study investigates the influence of stress ratio and local microstructure on small crack propagation in a superalloy using the Photomicroscopy method. The results show that crack growth rates are correlated with the stress ratio, and grain boundaries can temporarily arrest crack propagation.
The role of stress ratio and local microstructure on small crack propagation (0.065-1.0 mm) behaviours in superalloy FGH4096 were investigated using the Photomicroscopy method. Delta K correlated the growth rates of small cracks with different stress ratios well, which is attributed to the low crack closure level. Statistical and crystallographic analysis revealed that grain boundaries resulted in crack temporary arrests, which is independent of loading conditions and crack length. Temporarily arrested cracks propagated further by connecting to the secondary crack that initiated on the slip plane that parallels to the twin boundary or in the grain with a local highest Taylor factor.
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