期刊
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
卷 49A, 期 9, 页码 3865-3873出版社
SPRINGER
DOI: 10.1007/s11661-018-4780-3
关键词
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资金
- GE Global Research
- Center of Excellence on Integrated Materials Modeling (CEIMM) at Johns Hopkins University [FA9550-12-1-0445]
- AFOSR/Aerospace Materials for Extreme Environments Program
- AFRL/RX
Cyclic fatigue experiments in the high and very high cycle fatigue regimes have been performed on a Rene 88DT polycrystalline nickel-based superalloy. The microstructural configurations that favor early strain localization and fatigue crack initiation at high temperature from 400 degrees C to 650 degrees C have been investigated. Competing failure modes are observed in the high to the very high cycle fatigue regime. Fatigue cracks initiate from non-metallic inclusions and from intrinsic internal microstructural features. Interestingly, as stresses are reduced into the very high cycle regime, there is a transition to initiation only at crystallographic facets. At higher stress in the high cycle fatigue regime, a significant fraction of specimens initiate cracks at non-metallic inclusions. This transition is analyzed with regard to microstructural features that favor strain localization and accumulate damage early during cycling.
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