The corrosion fatigue crack growth (FCG) behavior of sensitized AISI 304 stainless steel was studied in 0.01M Na2SO4 solution at 250 C. Crack growth rates at different frequencies ranging from 1.0 to 8×10−3 Hz⁠, and at different electrochemical potentials, were measured with a sinusoidal loading waveform at a load ratio (⁠R=pmin/pmax⁠) of 0.5. The results show that both the FCG rate and the fracture morphology depend on the frequency and the applied potential. At low frequencies (below 8×10−2 Hz⁠), there is a critical potential (between −450 and −200 mVH) above which the FCG rates are significantly enhanced over those observed at lower potentials. Fracture morphology of sensitized AISI 304 stainless steel depends on the potential as well as the frequency. At low potentials and/or higher frequencies, transgranular cracking is the principal mode of failure; however, at high potentials and/or at low frequencies, the fatigue cracks propagate intergranularly.

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National Association of Corrosion Engineers
1984
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