Abstract
A series of crack growth tests on deeply notched specimens of several cast CrMoV steels subjected to bending moments was performed. The effects of composition and heat treatment were compared and the results assessed by linear elastic fracture mechanics and crack opening displacement methods. Only the latter correlated crack growth rates at different cracklength and also provided a useful definition of creep ductility. A critical displacement, dependent on microstructure, was required before crack growth was initiated. The effects of cyclic loading (10% of the test time and overall frequency 10 −3 Hz) on crack growth and creep rates and on creep ductility were found to be negligible. Thus there was no significant creep — fatigue interaction in the test.
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