Abstract
The stress corrosion cracking (SCC) behavior perpendicular to the fusion line in the transition region between the alloy 182 nickel-base weld metal and the adjacent low-alloy reactor pressure vessel (RPV) steel of simulated dissimilar metal weld joints was investigated under boiling-water reactor normal-water chemistry conditions at different stress intensities and chloride concentrations. A special emphasis was placed on the question whether a fast growing interdendritic SCC crack in the highly susceptible alloy 182 weld metal can easily cross the fusion line and significantly propagate into the adjacent low-alloy RPV steel. Cessation of interdendritic stress corrosion crack growth was observed in high-purity or sulfate-containing oxygenated water under periodical partial unloading or constant loading conditions with stress intensity factors below 60 MPa·m1/2 for those parts of the crack front that reached the fusion line. In chloride containing water, on the other hand, the interdendritic stress corrosi...
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