Conclusions
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1.
Pearlite-free steel alloyed with niobium has good resistance to brittle fracture — the ductile-brittle transition temperature determined from the work of crack propagationa p=2 kg-m/cm2 is −100°.
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2.
The optimal niobium concentration is about 0.1%. Further alloying with up to 0.35% Nb makes the steel considerably more expensive and leads to only a negligible increase in resistance to crack propagation.
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Literature cited
M. N. Georgiev et al., "Effect of carbon and boron on toughness of low-alloy normalized steel", NTO Mashprom, 8 (1972).
V. N. Nikitin et al., "Effect of niobium on susceptibility of steel to brittle fracture", Izv. Akad. Nauk SSSR, Metally, 4, 103 (1970).
M. N. Georgiev, M. P. Anuchkin, and V. A. Dogadaeva, "Toughness of steel 17GS", Metal. i Term. Obrabotka Metal., 2, 63 (1968).
Additional information
I. P. Bardin Central Scientific-Research Institute of Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 57–58, July, 1975.
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Popova, L.V., Zikeev, V.N. & Georgiev, M.N. Properties of pearlite-free steel with niobium. Met Sci Heat Treat 17, 604–605 (1975). https://doi.org/10.1007/BF00680411
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DOI: https://doi.org/10.1007/BF00680411