Fatigue crack propagation behavior of Ni-based superalloys after overloading at elevated temperatures

The fatigue crack propagation behavior of three superalloys subjected to a single overloading at elevated temperatures was investigated. The fatigue crack propagation rate FCPR versus stress intensity factor range data da/dN—ΔK were calculated using the two-point secant method. It was found that the...

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Bibliographic Details
Published in:Progress in natural science 2016-04, Vol.26 (2), p.197-203
Main Authors: Huang, Xinyue, Wang, Liang, Hu, Yunming, Guo, Guangping, Salmon, David, Li, Ying, Zhao, Wenxia
Format: Article
Language:English
Subjects:
closure
Superalloys
crack
Crack closure
Fatigue crack propagation rate
fatigue
Fatigue
High
High temperature fatigue
Overloading
propagation
rate
Overloading
Crack
Superalloys
temperature
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Summary:The fatigue crack propagation behavior of three superalloys subjected to a single overloading at elevated temperatures was investigated. The fatigue crack propagation rate FCPR versus stress intensity factor range data da/dN—ΔK were calculated using the two-point secant method. It was found that the crack growth rates of the investigated materials were retarded after overloading with an overload ratio R OL=1.6. The size of the plastic zone in the front of the crack tip and its relation to loading level were discussed. The overload retardation effects are attributed to crack closure. The fatigue damage in the plastic zone can also be a factor to explain the overload retardation.
ISSN:1002-0071
DOI:10.1016/j.pnsc.2016.03.007