Abstract
Fatigue crack growth data are reported for A533B material in a simulated primary PWR loop environment. Marked environmentally enhanced crack growth, characterised by the formation of a plateau in the growth rate versus ΔK curve, was observed in sinusoidal tests but was not evident in triangular waveform tests. Detailed fractography showed that inclusions can play an important role in fatigue crack growth behaviour. Of the two basic mechanisms suggested for environmentally enhanced crack growth, namely, dissolution-controlled and hydrogen induced cracking, the latter can more readily explain the results of the present investigation. At low R ratio, changing the waveform from triangular to sinusoidal induced environmentally enhanced crack growth and a possible explanation is given in terms of crack tip closure effects.
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