Conclusions
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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.
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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.
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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.
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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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Literature cited
G. V. Kurdyumov, L. M. Utevskii, and R. I. Éntin, Transformations in Iron and Steel [in Russian], Nauka, Moscow (1977).
A. S. Zav'yalov, "Dissolution processes and features of carbides during heat treatment of structural steel", in: Heat Treatment of Metals [in Russian], Mashgiz, Moscow (1950).
M. A. Balter, A. P. Lyubchenko, S. I. Aksenova, et al., Fractography, a Diagnostic Means for Failed Articles [in Russian], Mashinostroenie, Moscow (1987).
V. M. Finkel', Physical Bases of Failure Retardation [in Russian], Metallurgiya, Moscow (1977).
Additional information
Electrical Machine Building Enterprise Elektrosila, Leningrad. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 39–41, May, 1988.
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Boichenko, Y.A., Sosnin, A.V., Shokov, N.A. et al. Effect of strength level and original austenite grain size on the crack resistance of steel 38KhN3MFA. Met Sci Heat Treat 30, 366–369 (1988). https://doi.org/10.1007/BF00701048
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DOI: https://doi.org/10.1007/BF00701048