Abstract
1. Static fracture toughness and threshold values of the spread in stress intensity factor for rotor steel 38KhN3MFA heat treated under conditions providing through harden-ability depend on yield strength and the original austenite grain size. 2. The inversely proportional empirical relationship of fracture toughness with original austenite grain size for steel 38KhN3MFA corresponds to an analytical relationship of the Hall-Petch type. 3. An increase in threshold values for the spread of stress intensity factor correlates with an increase in austenite grain size for the steel according to a power function. 4. A reduction in the strength level for rotor steel leads to an increase in fracture toughness and the threshold stress intensity factor.
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