Abstract
We study the influence of the depth of a surface defect and its shape factor on the probability of fracture of a superheater collector made of 12Kh1MF steel after operation for 1.785 · 105h. We plot the dependences of the probability of fracture for a model of the collector weakened by a partially circular crack on its inner surface on the depth of the defect under the conditions of static loading, stress corrosion cracking, and cyclic loading. It is shown that the probability of fracture of the superheater collector increases with the crack depth and the value of the shape factor.
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