Abstract
A series of experiments were performed in order to clarify creep-fatigue crack propagation behavior and also to identify the parameter that characterizes the crack growth rate of 2 1/4 Cr-1 Mo steel at 500°C. The following results were obtained (1) Under cyclic loading with tensile load hold, the creep crack propagation during the tensile load hole was dominant. (2) While the crack growth rate was steady during the tensile load hold, the crack opening displacement increased radically right after the load hold started and afterwards increased steadily to the end of the tensile load hold. The radical increase of the crack opening displacement right after the tensile load hold was found not to be due to the crack growth. (3) The creep-fatigue crack propagation rate was characterized by the creep J-integral range calculated from the steady increase of the crack opening displacement during the tensile load hold, as is shown by Eq. (1) in the text.
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