Abstract
1. The character of the stress state in the vicinity of notches in impact specimens, which is determined by the notch, has a substantial influence on the γ → α transformation taking place as a result of cooling and deformation of steels with metastable structures; this leads to changes in the ductility of steel. 2. Increasing the notch depth in impact specimens of metastable austenitic steels produces a decrease in their impact strength, especially in the temperature range of intense γ → α transformation. 3. The reduction produced in the impact strength of structurally stable steels by increasing the notch depth is much smaller than in the case of metastable steels, since it is associated only with a change in the stress state. 4. The energy of crack propagation in steels of various strength and with various structures can be determined by the Gulyaev and Drozdovskii methods in the entire range of cryogenic temperatures. 5. Electron fractography of fracture surfaces of impact specimens is quite an effective method of estimating the impact properties of cryogenic steels.
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