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Multiple hardening and relaxation tests have been carried out on a nickel-based superalloy at 650 8C. The stress relaxation curves were obtained at selected strain levels, from which the plastic strain rates spanning three decades were obtained. Creep curves were simulated from the relaxation test results and compared reasonably well with those obtained from the creep tests. This method may be useful in the assessment of creep resistance, particularly during the material development stage.