Abstract
Studies on the stress corrosion cracking of an explosively plugged part were conducted. SUS 304 stainless steel was used as testing material. The distribution of residual stress in plug and tube plate after plugging was obtained. The effect of residual stress on the stress corrosion cracking was studied. Residual stress in tube plate near the plug was compressive and stress corrosion cracking did not occur in the tube plate there. However it occurred on the inner surface of plug because of residual tensile stress in axial direction of the plug. Stress corrosion tests in MgCl2 solution under constant load were conducted. The susceptibility to stress corrosion cracking of the explosive bonded boundary was lower than that of base metal. Stress corrosion tests in high temperature and high pressure pure water were also conducted by means of static type of autoclave but stress corrosion cracking did not occur under the testing condition used.
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