A short crack behavior is essential to construct a life time prediction model of a light water reactor component. The objective of this study is to evaluate a short crack behavior on primary water stress corrosion cracking (PWSCC) of mill annealed alloy 600. Constant load tests were conducted to investigate a short crack growth rate. Test time was fixed at 1000, 3000, 3880 and 6940 hr and no specimen was fractured during the test. Crack length was measured for all cracks and plotted to the Weibull probabilistic sheet. By calculating the maximum crack length using the Weibull parameter at each test time, crack growth rates were obtained. We found there were 2 kinds of crack growth stages. This means short cracks transform from slow speed stage to fast speed stage. Furthermore distribution of inclination of grain boundaries, which were cracked was investigated to consider the factors which influence to crack propagation. Consequently it is revealed that the crack
Understanding of short crack behaviors is essential to construct lifetime prediction models for light water reactor components. There is, however, no established method of directly measuring short crack behaviors. Therefore we need some interpolation or extrapolation technique to precisely evaluate the short crack growth rate. In this study, constant load tests were conducted to investigate a short crack growth rate on primary water stress corrosion cracking (PWSCC) for different mill annealed alloy 600 samples in primary water at 350°C. Maximum crack length was measured for each sample and then divided by relevant test duration to evaluate its crack growth rate. On the other hand, to determine the accurate crack growth rates, a crack growth simulation model which allowed for mechanical effects of grain boundaries on a crack kinked at the grain boundary triple point was developed. With this simulation model, the crack growth processes in the tests were reproduced using a computer and thereby the crack growth rate was evaluated.
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