Abstract
Corrosion fatigue crack growth tests have been carried out at various stress ratios for a low alloy steel SNCM 2 and type 304 stainless steel. Measurements of the effective stress intensity factor range ratio U were performed to explain the effect of stress ratio R. The corrosive environment decreased da/ dN at R = 0.1, 0.4 and little affected da/ dN at R = 0.9 for SNCM 2 and increased da/ dN at all R ratios for SUS 304. It was confirmed that there exists a threshold stress intensity factor ΔK thCF in 3% NaCl solution for both materials tested. The corrosive environment decreased ΔK thCF for all conditions tested except at R = 0.1 and 0.4 for SNCM 2, where ΔK thCF -values were nearly equal to ΔK th -values in air. ΔK thCF /ΔK th was 0.6 at R = 0.9 for SNCM 2 and 0.8, 0.5 and 0.7 at R = 0.1, 0.7 and 0.9 for SUS 304, respectively. It was shown that the complicated effect of stress ratios on crack growth for SNCM 2 can be explained using effective stress intensity factor ΔK eff .
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