Effect of cyclic loadings on stress relaxation behaviors of 9–12%Cr steel at high temperature

Stress relaxation experiments of 9–12%Cr steel were conducted under static and cyclic straining controlled fatigue. It has been found that the stress relaxation will be restrained where the cyclic strain values are fluctuated below the initial strain. By contrast, when the dynamic loading repeated around or fluctuated above the value of the initial strain, the stress relaxation becomes more severe or even relaxed completely for the strain...