The approaches traditionally used to quantify creep and creep fracture are critically assessed and reviewed in relation to a new approach proposed by Wilshire and Scharning. The characteristics, limitations, and predictive accuracies of these models are illustrated by reference to information openly available for the bainitic 1Cr–1Mo–0.25V steel. When applied to this comprehensive long-term data set, the estimated 100,000–300,000 h strength obtained from the older so called traditional methods varied considerably. Further, the isothermal predictions from these models became very unstable beyond 100,000 h. In contrast, normalizing the applied stress through an appropriate ultimate tensile strength value not only reduced the melt to melt scatter in rupture life, but also the 100,000 h strengths determined from this model for this large scale test program are predicted very accurately by extrapolation of creep life measurements lasting less than 5000 h. The approach therefore offers the potential for reducing the scale and cost of current procedures for acquisition of long-term engineering design data.
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April 2009
Research Papers
Critical Review and Appraisal of Traditional and New Procedures for the Quantification of Creep Fracture Behavior Using 1Cr–1Mo–0.25V Steel
M. Evans
M. Evans
School of Engineering,
e-mail: m.evans@swansea.ac.uk
Swansea University
, Singleton Park, Swansea SA2 8PP, UK
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M. Evans
School of Engineering,
Swansea University
, Singleton Park, Swansea SA2 8PP, UKe-mail: m.evans@swansea.ac.uk
J. Eng. Mater. Technol. Apr 2009, 131(2): 021011 (14 pages)
Published Online: March 9, 2009
Article history
Received:
September 15, 2008
Revised:
December 11, 2008
Published:
March 9, 2009
Citation
Evans, M. (March 9, 2009). "Critical Review and Appraisal of Traditional and New Procedures for the Quantification of Creep Fracture Behavior Using 1Cr–1Mo–0.25V Steel." ASME. J. Eng. Mater. Technol. April 2009; 131(2): 021011. https://doi.org/10.1115/1.3078391
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