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Thermodynamic activity of carbon in recarburizing

  • Heat Treatment Technology
  • Published:
Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    We determined the numerical values of the interaction parameters of Si, Al, Cr, Ti, V, Mo, W, Mn, and Ni, characterizing the effect of alloying elements on the thermodynamic activity of carbon for recarburizing and carburizing in an endothermal atmosphere at 950°.

  2. 2.

    A quantitative relationship (7) was established for the change in the thermodynamic activity of carbon in austenite under the influence of complex alloying, making it possible to calculate the carbon potential for recarburizing and carburizing of alloy steels.

  3. 3.

    The applicability of formula (7) was determined for carburizing of impurity-free alloys of the Fe−Cr−Ni, Fe−Ni−Si, Fe−Cr−Ni−Si, and Fe−W−Mo systems and steels 45, 45G2, 60, 60S2, U10, and ShKh15 after recarburizing.

  4. 4.

    Knowing the activity coefficient of carbon in complex-alloyed austenite, one can determine the necessary carbon potential of the atmosphere for a given alloy steel, using the gas-metal equilibrium diagrams for carbon steels.

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Authors
  1. B. A. Moiseev
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  2. Yu. M. Brunzel
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  3. L. A. Shvartsman
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Additional information

Central Scientific-Research Institute of Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 1, pp. 21–26, January, 1974.

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Moiseev, B.A., Brunzel, Y.M. & Shvartsman, L.A. Thermodynamic activity of carbon in recarburizing. Met Sci Heat Treat 16, 23–27 (1974). https://doi.org/10.1007/BF00679196

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  • DOI: https://doi.org/10.1007/BF00679196

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