Use of the Wilshire Equations to Correlate and Extrapolate Creep Data of HR6W and Sanicro 25

Cedro III, Vito; Garcia, Christian; Render, Mark

doi:10.3390/ma11091585

Use of the Wilshire Equations to Correlate and Extrapolate Creep Data of HR6W and Sanicro 25

Journal Article · Sat Sep 01 04:00:00 EDT 2018 · Materials

DOI:https://doi.org/10.3390/ma11091585· OSTI ID:1628405

Cedro III, Vito ^[1]; Garcia, Christian ^[2]; ^[3]

National Energy Technology Lab. (NETL), Pittsburgh, PA (United States); DOE/OSTI
Univ. of Texas Rio Grande Valley, Edinburg, TX (United States). Mechanical Engineering Dept.
KeyLogic Systems, Inc., Morgantown, WV (United States)

Advanced power plant alloys must endure high temperatures and pressures for durations at which creep data are often not available, necessitating the extrapolation of creep life. Many methods have been proposed to extrapolate creep life, and one of recent significance is a set of equations known as the Wilshire equations. With this method, multiple approaches can be used to determine creep activation energy, increase the goodness of fit of available experimental data, and improve the confidence level of calculating long-term creep strength at times well beyond the available experimental data. In this article, the Wilshire equation is used to extrapolate the creep life of HR6W and Sanicro 25, and different methods to determine creep activation energy, region splitting, the use of short-duration test data, and the omission of very-short-term data are investigated to determine their effect on correlation and calculations. It was found that using a known value of the activation energy of lattice self-diffusion, rather than calculating

Q_{C}^{*}

from each data set, is both the simplest and most viable method to determine

Q_{C}^{*}

. Region-splitting improved rupture time calculations for both alloys. Extrapolating creep life from short-term data for these alloys was found to be reasonable.

View Accepted Manuscript (DOE)

Research Organization:: KeyLogic Systems, LLC, Morgantown, WV (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE); Mickey Leland Fellowship

Grant/Contract Number:: FE0025912

OSTI ID:: 1628405

Journal Information:: Materials, Journal Name: Materials Journal Issue: 9 Vol. 11; ISSN MATEG9; ISSN 1996-1944

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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Use of the Wilshire Equations to Correlate and Extrapolate Creep Data of HR6W and Sanicro 25

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