Abstract
The fatigue crack growth rates for nickel-based superalloy Haynes 282 were measured at 550, 650, and 750 °C using compact tension specimens with a load ratio of 0.1 and cyclic loading frequencies of 25 and 0.25 Hz. The crack path was observed to be primarily transgranular for all temperatures, and the observed effect of increasing temperature was to increase the fatigue crack growth rates. The activation energy associated with the increasing crack growth rates over these three temperatures was calculated less than 60 kJ/mol, which is significantly lower than typical creep or oxidation mechanisms; therefore, creep and oxidation cannot explain the increase in fatigue crack growth rates. Transmission electron microscopy was done on selected samples removed from the cyclic plastic zone, and a trend of decreasing dislocation density was observed with increasing temperature. Accordingly, the trend of increasing crack growth rates with increasing temperature was attributed to softening associated with thermally assisted cross slip and dislocation annihilation.
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Abbreviations
- ΔK :
-
Stress intensity range
- R :
-
Load ratio
- da/dN :
-
Fatigue crack growth rate
- k FCP f (a):
-
A term containing all non-temperature-dependent terms related to fracture mechanics (i.e., stress intensity range, load ratio, yield strength, crack length, etc.)
- Q :
-
Apparent activation energy
- R g :
-
Universal gas constant
- T :
-
Temperature
- N :
-
Normalization factor
- W :
-
Compact tension specimen width
- B :
-
Compact tension specimen thickness
- F :
-
Frequency
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Acknowledgments
This work was funded by the Cross-Cutting Technologies Program at the National Energy Technology Laboratory (NETL) - Strategic Center for Coal, managed by Robert Romanosky (Technology Manager) and Charles Miller (Technology Monitor). The Research was executed through NETL’s Office of Research and Development’s Innovative Process Technologies (IPT) Field Work Proposal with David Alman serving as the Materials Focus Area Lead.
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Rozman, K.A., Kruzic, J.J., Sears, J.S. et al. Fatigue Crack Growth Mechanisms for Nickel-based Superalloy Haynes 282 at 550-750 °C. J. of Materi Eng and Perform 24, 3699–3707 (2015). https://doi.org/10.1007/s11665-015-1678-8
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DOI: https://doi.org/10.1007/s11665-015-1678-8