Stress Corrosion Crack Growth Behavior of Domestic Alloy 52 Dissimilar Weld Metal in High Temperaturre Water

Autoclave was used to study the stress corrosion cracking (SCC) behaviors of domestic alloy 52 dissimilar welding materials in simulated PWR nuclear power plant primary water environment,and the length of crack expending was on-line monitored by direct current potential drop (DCPD). The results showed that very slight SCC happened when domestic 52 alloy dissimilar welding under loading in the environment of simulated PWR primary water, and the crack growth rate was 1.93×10^-9 mm/s. The monitoring results from DCPD were in good agreement with the measured results. TGSCC was the main cracking path. The crack growth rates were lower than those of 82/182 alloy dissimilar metal welding materials in two orders of magnitude and consistent with the experimental results got by foreign research inistitutions.