Abstract
As a result of the action of high-temperature aqueous media, the fatigue resistance of steels drops significantly, which may be the reason for damage to pressure vessels. For engineering calculations, the results of investigations are presented of constructional steels under conditions as close as possible to service conditions. The authors investigated the crack growth rate in 25-mm-thick compact specimens of 15Kh2NMFA steel in the standard heat-treated condition. The reactor water was prepared from double distillate with the addition of 10 g/liter of boric acid and 0.02 g/liter of potassium hydroxide and with sodium hydroxide. The proposed model presented makes it possible to significantly reduce the volume of autoclave tests of materials for atomic power stations and also to predict the life of metals under real service conditions.
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