Abstract
The effect of mechanical degradation in a long-term-operated component on the creep-and fatigue-crack growth rates was studied. Creep-crack-growth tests and fatigue-crack growth tests were performed on creep-pre-strained and cyclic-strained CrMoV rotor-steel specimens. It was found that under constant load, creep-crack growth rates, da/dt, of the creep-pre-damaged specimens were higher than those of virgin specimens. Another result showed that fatigue-crack growth rates, da/dn, of fatigue-pre-damaged specimens were higher than those of virgin specimens. The results suggest that the creep remaining lives and fatigue remaining lives of the mechanically damaged CrMoV rotor steel can be estimated by using C^*&ΔJ of the damaged material and the da/dt and da/dn values of the virgin material.
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