The creep strengths for an annealed Ni-33Fe-25Cr alloy, UNS N08120 (HAYNES® HR-120® alloy) are presented from 593°C to 1204°C at every 56°C for lives up to 30,000 hours. The creep data are used as a basis for converting the power law method (log stress versus log time at a defined temperature) to the usefulness of the Larson-Miller method for design creep analysis. A new empirical relationship was developed between stress, temperature and creep rupture life. Power Law equations were generated at each temperature using linear regression of the transformed data to obtain the best-fit constants. The constants were then plotted and a best-fit polynomial of the constants as a function of temperature was determined. The polynomial then replaced the constants in the original power law equation to obtain a single expression of stress as a function of time and temperature. Using this new Modified Power Law (MPL) equation, interpolation or extrapolation to obtain stress becomes possible for any temperature and time.
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August 2004
Technical Papers
A Modified Power Law for Creep Analysis
Michael Katcher
Michael Katcher
Haynes International, Kokomo, IN 46904
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Michael Katcher
Haynes International, Kokomo, IN 46904
Contributed by the Pressure Vessels and Piping Division for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received by the PVP Division August 21, 2003; revision received March 10, 2004. Editor: S. Y. Zamrik.
J. Pressure Vessel Technol. Aug 2004, 126(3): 341-344 (4 pages)
Published Online: August 18, 2004
Article history
Received:
August 21, 2003
Revised:
March 10, 2004
Online:
August 18, 2004
Citation
Katcher, M. (August 18, 2004). "A Modified Power Law for Creep Analysis ." ASME. J. Pressure Vessel Technol. August 2004; 126(3): 341–344. https://doi.org/10.1115/1.1763931
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