Should creep parameters determined by constant strain-rate experiments be considered constant? For this discussion, a Weertman-type creep equation is used, and it is suggested that the final internal structure is not the same for all final stress, temperature, and strain-rate values. It is shown that, if the pre-exponential factor is allowed to vary by a factor of less than two over a set of final states, then the creep energy will differ significantly from the constant pre-exponential value.

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