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Structure and toughness of medium-carbon steel with boron

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Conclusions

  1. 1.

    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.

  2. 2.

    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

  1. 1.

    L. L. Pyatakova, M. A. Sirotkina, and M. V. Mokasov, “Improvement in the mechanical properties of medium-carbon steel after low-temperature tempering by microalloying with boron,” Conference on Theory and Practice of Microalloying and Modification of Steel [in Russian], Donetsk (1972).

  2. 2.

    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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    V. I. Arkharov and S. D. Vangengeim, “Factors influencing the internal adsorption effect in solid solutions,” Fiz. Metal. Metalloved., No. 4, 447 (1957).

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    L. S. Lyakhovich and L. L. Pyatakova, “Some characteristics of the effect of boron on propeties of structural steel,“ in: New Developments in Metal Science and Technology of Heat-Treating Steel [in Russian], Chelyabinskoe Knizhnoe Izd. (1962), pp. 48–96.

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    S. D. Gertsriken and I. Ya. Dekhtyar, Diffusion in Metals and Alloys in the Solid State [in Russian], Metallurgiya, Moscow (1960).

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    P. L. Gruzin, “Some relationships between diffusion and distribution of elements in alloys,” Metal. i Term. Obrabotka Metal., No. 10, 5–14 (1960).

  7. 7.

    G. V. Kurdyumov and R. I. Éntin, “Structure of martensite and strength of steel,” Izv. Akad. Nauk SSSR, Metally, No. 1, 30–39 (1969).

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    G. Speich and W. Leslie, Met. Trans.,3, No. 5, 1043 (1972).

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    A. P. Gulyaev, Metal Science [in Russian], Metallurgiya, Moscow (1966), p. 478.

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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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Keywords

  • Carbide
  • Boron
  • Martensite
  • Notch Toughness