Abstract
By using the Ritchie–Knott–Rice criterion of local fracture, we analyze the conditions of initiation and propagation of microcracks in 13KhMF ferritic steel with various microstructures. The probability of fracture by transgranular cleavage for a given level of stresses σ yy in the tests for static crack resistance is estimated with regard for the grain sizes, the presence of carbides, and their dispersion. For steels with various microstructures, we determine the critical stresses σ C1.0 and critical lengths r C upon the attainment of which the material fails according to the mechanism of transgranular cleavage with probability P f =1.0.
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