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Structure and toughness of medium-carbon steel with boron

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    The addition of small amounts of boron (0.002%) and its distribution in the boundaries of zones and its interaction with carbon make it possible to obtain a substructure of martensite that is finer and more even in size after quenching of highly deformed medium-carbon steel, and a more dispersed substructure of martensite and carbides precipitated during low-temperature tempering of the steel.

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    The effect of boron on the structural parameters facilitates, along with other factors, obtaining high values of the notch toughness (a=8 kg-m/cm2) and high values of the work of crack propagation in medium-carbon steel of the 40G type with high strength (ob=180 kg/mm2).

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Literature cited

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    L. L. Pyatakova, “Mechanism by which boron improves the ductility and toughness of medium-carbon steel,” Izv. Vyssh. Uchebn. Zaved. Chernaya Metallurgiya, No. 12 (1974).

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Additional information

Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 1, pp. 39–42, January, 1976.

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Pyatakova, L.L., Mints, I.I., Berezina, T.G. et al. Structure and toughness of medium-carbon steel with boron. Met Sci Heat Treat 18, 47–51 (1976). https://doi.org/10.1007/BF00663749

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  • Carbide
  • Boron
  • Martensite
  • Notch Toughness