Conclusions
-
1.
The temperature dependence of the carburizing rate coeffcient in H2−CH4−H2O mixtures diluted with nitrogen is described by the Arrhenius equation K=K·e−Q/RT.
The activation energy of this proces depends on carbon content in the steel and it may be determined from the relationship Q=(55000+e11C)·4.187 kJ/mole (where C is carbon content in the steel, %).
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2.
The mass transfer coefficient during carburizing in H2−CH4−H2O mixtures diluted with nitrogen decreases with an increase in carbon content in the foil.
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3.
The specific flow of carbon into the metal depends to a considerable degree on carburizing temperature, methane content in the mixture, and carbon content in the steel.
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4.
A reduction in carburizing intensity with an increase in carbon content in the steel may be connected with development of pyrocarbon nuclei and a reduction in the number of active centers of the foil surface.
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Additional information
Central Institute of Power Systems and Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 7–11, December, 1985.
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Éstrin, B.M., Mnushkin, O.S. & Shkol'nikov, M.A. Kinetics of carburizing in a nitrogen-hydrogen atmosphere with addition of pure methane. Met Sci Heat Treat 27, 881–886 (1985). https://doi.org/10.1007/BF00700094
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DOI: https://doi.org/10.1007/BF00700094