2009 Volume 50 Issue 3 Pages 657-663
Fatigue crack growth tests were performed to evaluate the effect of cold work on the fatigue behavior of 304L stainless steel in the ambient air at room temperature and 300°C and in a simulated BWR coolant environment, respectively. The fatigue crack growth rates (FCGRs) for the as-received (AR) and cold-rolled specimens at room temperature were in the same range and the FCGRs obtained at 300°C in air were higher than those at room temperature. In addition, the FCGRs for the AR specimens were higher at 300°C in air compared with those for the cold-rolled. The specimens tested in the water environment at 300°C showed higher corrosion fatigue crack growth rates (CFCGRs) relative to those measured in air at room temperature and 300°C. Local quasi-cleavages could account for the observation that the FCGRs in air at 300°C were faster than at room temperature. The dominant fracture features of quasi-cleavages, along with corrosion products, were observed with all the 304L specimens tested in the simulated BWR water environment, which could be related to the higher crack growth rates in the corrosive environment.