Several time-compensated temperature parameters, which were proposed as dependent only on the initial stress, are discussed with relation to time of creep rupture and to minimum and average creep rates. The so-called master “curve” is discussed in terms of experimentally determined relationships. In checking the validity of the proposed parameters, using experimental results for several ferritic and austenitic steels, it is found that these parameters are not single-valued functions of the initial stress over wide ranges in stress, and the existence of a master curve for these parameters is doubtful.

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