Abstract
The fatigue crack growth properties for a low-alloy steel, Cr-Mo-V, and two stainless steels, types 403 and 304, were investigated at 550°C in air under two sawtooth loading waveforms of slow-fast and fast-slow, and three trapezoidal waveforms of tension hold, compression hold and tension-compression hold. The effect of the waveform was obvious for Cr-Mo-V and 304 steels in the crack growth, while the crack growth rate was almost independent of waveform for 403 steel. A mixed mode transgranular and intergranular fracture was observed for 304 steel, while the transgranular fracture was predominant for 403 steel. The oxide layer formed on the polished surface in a furnace was thicker on Cr-Mo-V steel than on 403 and 304 steels. From these results, it was found that the controlling factor for the waveform effects on the elevated temperature fatigue crack growth properties could be attributed to the oxidation for Cr-Mo-V steel and the creep damage for 304 steel ;these two damaging phenomena, however, had little effect on 403 steel in this experiment.
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