Abstract
Thermo-mechanical fatigue (TMF) testing is increasingly used as a means of bench-marking the response of critical locations in high temperature components during operation by subjecting laboratory specimens to service and cyclic loading conditions involving the simultaneous action of thermal and mechanical strains. In this paper, evidence is presented to show the effect of maximum temperature in TMF cycles without and with superimposed high frequency (HCF) loading on crack initiation endurances for GJV-450 vermicular cast irons. For TMF cycles with maximum temperatures in the range 400–480 °C, there is little influence of superimposed higher frequency HCF strain amplitudes of up to ±0.03% on crack initiation endurance, whereas the effects of higher superimposed HCF loading are more significant.
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