steel. The CFCG data has been characterised using stress intensity factor range parameter, ΔK and C* parameter. The crack
growth per cycle and ∆K relationship shows that at high frequency, the CFCG behaviour tends to that of high cycle fatigue crack
growth and at low frequency, the contribution of creep becomes increasingly more significant. The correlation between crack
growth rate and C* parameter, shows that most CFCG data fall within the creep crack growth (CCG) P91 data band which may
indicate that the crack growth behaviour is dominated by creep processes. Fractography has also shown an intergranular, ductile
fracture surface indicating creep dominance for the conditions considered. A linear cummulative rule has ben used to predict the
CFCG experimental result.