Abstract
The fatigue crack growth rates for nickel-based superalloy Haynes 282 were measured at temperatures of 550, 650, and 750 °C using compact tension specimens with a load ratio of 0.1 and cyclic loading frequencies of 25 Hz and 0.25 Hz. Increasing the temperature from 550 to 750 °C caused the fatigue crack growth rates to increase from ~20 to 60% depending upon the applied stress intensity level. The effect of reducing the applied loading frequency increased the fatigue crack growth rates from ~20 to 70%, also depending upon the applied stress intensity range. The crack path was observed to be transgranular for the temperatures and frequencies used during fatigue crack growth rate testing. At 750 °C, there were some indications of limited intergranular cracking excursions at both loading frequencies; however, the extent of intergranular crack growth was limited and the cause is not understood at this time.
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Abbreviations
- R :
-
Load ratio
- P min :
-
Minimum load
- P max :
-
Maximum load
- ΔK :
-
Stress intensity range
- a :
-
Crack length
- W :
-
Specimen width
- B :
-
Specimen thickness
- C p :
-
Paris constant
- m :
-
Paris slope constant
- σ:
-
Yield strength
- E :
-
Young’s modulus
- T :
-
Temperature
- F :
-
Frequency
- da/dN :
-
The crack growth rate per cycle
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Acknowledgment
This research was supported in part by an appointment to the U.S. Department of Energy (DOE) Postgraduate Research Program at the National Energy Technology Laboratory administered by the Oak Ridge Institute for Science and Education. The authors would also like to thank Dr. Rawley Greene for experimental support and technical programming.
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Rozman, K.A., Kruzic, J.J. & Hawk, J.A. Fatigue Crack Growth Behavior of Nickel-base Superalloy Haynes 282 at 550-750 °C. J. of Materi Eng and Perform 24, 2841–2846 (2015). https://doi.org/10.1007/s11665-015-1588-9
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DOI: https://doi.org/10.1007/s11665-015-1588-9