Creep behavior of type 316 stainless steel subjected to plastic prestrain at elevated temperature.

History effects of plastic prestrain on subsequent creep behavior were studied experimentally for type 316 stainless steel at 650°C. The plastic prestrain was first applied to thin-walled tubular specimens in the axial tensile direction, and then subsequent constant load creep tests were carried out under various multiaxial states of stress with an identical equivalent stress. Furthermore. variations in creep resistance caused by the plastic prestrain were compared with those caused by the same amount of creep prestrain. In experimental results, it was shown that the increase in creep resistance appeared differently depending on the amount and relative direction of plastic prestrain, and that the increase appeared more markedly for creep prestrain than the same amount of plastic one.