Conclusions
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1.
Slow cooling of Cr−Ni−Mo steel in the austenitic condition to the initial temperature of the bainitic transformation lowers the fracture toughness and raises T50.
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2.
Lowering the cooling rate in the bainitic range (500–200°) increases the quantity of upper bainite, which lowers the fracture toughness and raises T50.
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3.
After cooling at the same rate and tempering, steel 34KhN3M has a more homogeneous and dispersed bainitic structure due to the low tempering temperature, and thus higher fracture toughness and lower T50, than steel 35KhNM.
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4.
Increasing the weight of the original ingot lowers the fracture toughness and raises T50 due to the greater heterogeneity of the ingot.
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Literature cited
V. I. Arkharov, P. V. Sklyuev, and V. O. Esin, “Lowering of MS with partial decomposition of austenite in the bainitic range”, Fiz. Met. Metalloved.,3, No. 1, 63 (1956).
S. Z. Bokshtein, Structure and Properties of Metallic Alloys [in Russian], Metallurgiya, Moscow (1971).
L. L. Pyatakova et al., “Effect of microheterogeneity on cold brittleness of low-alloy steel”, Metalloved. Term. Obrab. Met., No. 12, 48 (1973).
P. V. Sklyuev, N. N. Aleksandrova, and N. V. Remez, “Treatment to prevent hairline creacks in alloy structural steels”, Metalloved. Term. Obrab. Met., No. 7, 12 (1966).
R. I. Éntin, Transformation of Austenite in Steel [in Russian], Metallurgizdat, Moscow (1960).
Additional information
Ural Machine Construction Factory. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 8, pp. 10–13, August, 1977.
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Sklyuev, F.V. Effect of cooling rate and supercooling temperature on the fracture toughness and transition temperature of steels 35KhNM and 34KhN3M. Met Sci Heat Treat 19, 649–651 (1977). https://doi.org/10.1007/BF00673851
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DOI: https://doi.org/10.1007/BF00673851