Conventional time-temperature-parameter (TTP) methods often overestimate long-term rupture life of creep strength enhanced ferritic steels. Decrease in activation energy Q for rupture life in long-term creep is the cause of the overestimation, since the TTP methods cannot deal with the change in Q. Creep rupture data of a heat of Gr.122 steel (up to 26,200 h) were divided into several data sets so that Q was unique in each divided data set. Then a TTP method was applied to each divided data set for rupture life prediction. This is the procedure of multiregion analysis of creep rupture data. The predicted rupture lives have been reported in literature. Long-term rupture lives (up to 51,400 h) of the same heat of the steel have been published in 2013. The multiregion analysis of creep rupture life can predict properly the long-term lives reported. Stress and temperature dependences of rupture life show similar behavior among different heats. Therefore, database on results of the multiregion analyses of various heats of the steel is helpful for rupture life estimation of another heat.
Prediction of Long-Term Creep Rupture Life of Grade 122 Steel by Multiregion Analysis
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received April 14, 2014; final manuscript received July 29, 2014; published online October 15, 2014. Assoc. Editor: Marina Ruggles-Wrenn.
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Maruyama, K., Nakamura, J., and Yoshimi, K. (October 15, 2014). "Prediction of Long-Term Creep Rupture Life of Grade 122 Steel by Multiregion Analysis." ASME. J. Pressure Vessel Technol. April 2015; 137(2): 021403. https://doi.org/10.1115/1.4028203
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