Changes in the macro-yield strength of an annealed austenitic stainless steel Type 321S12 have been investigated. For zero to peak (R = 0) axial loading tests there is a progressive increase in the yield strength compared with the static value. For completely reversed (R= − 1) loading tests there is an initial increase(∼ 17%)followed by a progressive decrease in the yield strength. The yield strength finally attained, for both loading conditions, was approximately that of the cyclic stress applied. Hysteretic heating to ∼ 400°C is associated with cycling at the higher stresses under R&= −1 loading.
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