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Constraints Imposed by the Wilshire Methodology on Creep Rupture Data and Procedures for Testing the Validity of Such Constraints: Illustration Using 1Cr-1Mo-0.25V Steel

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Abstract

A new parametric approach, termed the Wilshire equations, offers the realistic potential of being able to accurately life materials operating at in service conditions from accelerated test results lasting no more than 5000 hours. These Wilshire equations contain discontinuities that have in the literature been interpreted either in terms of changing deformation mechanisms or changes in where deformation occurs within a material (i.e., within boundaries or crystals). This paper demonstrates that the rather restrictive nature of these discontinuities within the Wilshire equations can lead to problems in identifying an appropriate model for long-term life prediction. An alternative framework is developed that removes these restrictions but still maintains the fundamental nature and characteristics of the Wilshire methodology. Further, when this alternative structure is applied to 1Cr-1Mo-0.25V steel, it produces more accurate and realistic looking long-term predictions of the time to failure.

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References

  1. ASME Boiler & Pressure Vessel Code, Sec. II, Part D, Appendix I, ASME, 2004.

  2. J. Hald: Creep strength and ductility of 9 to 12% chromium steels, Materials at High Temperatures, 21, 2004, 41–46.

    Article  Google Scholar 

  3. B. Wilshire, A.J. Battenbough: Creep and creep fracture of polycrystalline copper, Materials Science and Engineering A, 443, 2007, 156-166.

    Article  Google Scholar 

  4. B. Wilshire, P.J. Scharning: Prediction of long term creep data for forged 1Cr-1Mo-0.25V steel, Materials Science and Technology, 24(1), 2008, 1-9.

    Article  Google Scholar 

  5. B. Wilshire, M. Whittaker: Long term creep life prediction for grade 22 (2.25Cr-1Mo) steels, Materials Science and Technology, 27(3), 2011, 642-647.

    Article  Google Scholar 

  6. B. Wilshire, P.J. Scharning: A new methodology for analysis of creep and creep fracture data for 9-12% chromium steels, International Materials Reviews, 53(2), 2008, 91-104.

    Article  Google Scholar 

  7. A. Abdallah, K. Perkins, S. Williams: Advances in the Wilshire extrapolation technique - Full creep curve representation for the aerospace alloy Titanium 834, Materials Science and Engineering A, 550, 2012, 176-182.

    Article  Google Scholar 

  8. M.T. Whittaker, M. Evans, B. Wilshire: Long-term creep data prediction for type 316H stainless steel, Materials Science and Engineering A, 552, 2012, 145-150.

    Article  Google Scholar 

  9. D. Allen, S. Garwood: Energy Materials-Strategic Research Agenda. Q2, Materials Energy Review, IoMMH, London 2007.

    Google Scholar 

  10. F.C. Monkman and N.J. Grant: in An Empirical Relationship Between Rupture Life and Minimum Creep Rate: Deformation and Fracture at Elevated Temperature, N.J. Grant and A.W. Mullendore, eds., MIT Press, Boston, 1963.

  11. National Institute for Materials Science, Creep Data Sheet No. 9b, 1990.

  12. M. Evans: Formalisation of the Wilshire - Scharning methodology to creep life prediction with application to 1Cr-1Mo-0.25V rotor steel, Materials Science and Technology, 26(3), 2010, 309-317.

    Article  Google Scholar 

  13. M. F. Ashby, D.R.H. Jones: Engineering Materials 1: An introduction to their properties & applications, Butterworth-Heinemann, Oxford 1996.

    Google Scholar 

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Authors and Affiliations

  1. College of Engineering, Swansea University, Singleton Park, Swansea, SA2 8PP, U.K.

    Mark Evans

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  1. Mark Evans
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Correspondence to Mark Evans.

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Manuscript submitted June 12, 2014.

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Evans, M. Constraints Imposed by the Wilshire Methodology on Creep Rupture Data and Procedures for Testing the Validity of Such Constraints: Illustration Using 1Cr-1Mo-0.25V Steel. Metall Mater Trans A 46, 937–947 (2015). https://doi.org/10.1007/s11661-014-2655-9

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  • DOI: https://doi.org/10.1007/s11661-014-2655-9

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