Abstract
The influence of frequency, waveform, and tensile ramp time on the cyclic crack propagation rate of AISI type 304 stainless steel at 570°C in air has been studied. Using a balanced waveform, the crack propagation rate increased with decrease in frequency below 5 Hz. A slow-fast triangular waveform resulted in the fastest crack growth rate and the fracture surface was intergranular. On the other hand, the crack propagation rate associated with a fast-slow triangular waveform was less than that for a balanced triangular waveform of the same frequency. An empirical relationship is developed which expresses the cyclic crack propagation rate in terms of the frequency, ratio of loading/unloading times, and the stress intensity factor range.
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