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Synopsis: The effect of thermal aging on the elevated temperature low-cycle fatigue life of 304 and 321 stainless steels was studied using the creep-fatigue analysis by the strain-range partitioning approach. The Δεpp-Npp and Δεcp-Ncp properties were determined based on the results of strain-controlled lowcycle fatigue tests with a symmetrical and an asymmetrical triangular wave form. The test with a trapezoidal strain-wave form was also conducted and the effect of hold time was examined. Aging temperatures of 650 and 700°C and aging times of 1000 and 3000 hours were employed for 321 steel, and for 304 steel only one condition of 650°C and 1000 hours was examined. Thermal aging produced beneficial results relative to unaged material in the creep-fatigue pro-

The Effect of Thermal Aging on the Low-cycle Fatigue Behavior of Type 304, and 321 Stainless Steel at Elevated Temperature