Abstract
Statistical fatigue tests in the long-life region were conducted on a medium carbon steel, S45C, in 3%NaCl solution. It was found that corrosion fatigue life distribution followed the three-parameter Weibull distribution and the scatter of fatigue life increased with decreasing stress level. Along with these fatigue tests, the growth behavior of corrosion pits was examined using a laser microscope. The distribution of corrosion pit depth followed the log-normal distribution, and the corrosion pit depth increased with increasing time or the number of stress cycles. It was confirmed that the growth of corrosion pits depended on the stress level and was enhanced with increasing stress level. Based on these results, a growth law of corrosion pits including the effect of stress level was proposed.
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