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Fatigue Crack Growth Behavior of Nickel-base Superalloy Haynes 282 at 550-750° C

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https://ir.library.oregonstate.edu/concern/articles/1831cm63x

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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.
  • Keywords: mechanical characterization, fatigue crack growth rate, electron microscopy, nickel-based superalloys
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  • Rozman, K. A., Kruzic, J. J., & Hawk, J. A. (2015). Fatigue Crack Growth Behavior of Nickel-base Superalloy Haynes 282 at 550-750° C. Journal of Materials Engineering and Performance, 24(8), 2841-2846. doi:10.1007/s11665-015-1588-9
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  • 24
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  • 8
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  • This report was prepared as an account of work sponsored by an agency of the United States Government.
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