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Saturation of steel Kh18N10T with molybdenum from the vapor phase

  • Chemicothermal Treatment
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Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    It was found experimentally that under certain conditions of coating steel Kh18N10T with molybdenum from the vapor phase the diffusion coating has a structure characteristic of reaction diffusion in the initial stage of the process. With an increase of the processing time an interlayer of α phase appears in the molybdenum coating, in conformity with the molybdenum-austenitic steel phase diagram.

  2. 2.

    From calculation of the balance of mass transfer of molybdenum at the interface and investigation of the structure of the diffusion coating it was found that the reaction mechanism of diffusion is due to the value of the ratio of external mass transfer to internal mass transfer and also to the thermodynamic factor.

  3. 3.

    The kinetics of the growth of α phase in the molybdenum coating was investigated. The growth rate is characterized by a parabolic law and is limited by the diffusion of molybdenum through the layer of Fe3Mo2.

  4. 4.

    The diffusion coefficient of molybdenum in α phase was calculated in coating steel Kh18N10T with molybdenum from the vapor phase.

  5. 5.

    It was found that there may be an advantage in the structure of the molybdenum coating obtained under conditions of reaction diffusion, which can be used to develop means of protecting austenitic steels against corrosion.

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Literature cited

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Authors
  1. V. V. Dymchenko
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  2. Yu. N. Griboedov
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  3. Yu. M. Bogatyrev
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Additional information

Central Scientific-Research Institute of Heavy Machine Construction. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 17–21, March, 1973.

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Dymchenko, V.V., Griboedov, Y.N. & Bogatyrev, Y.M. Saturation of steel Kh18N10T with molybdenum from the vapor phase. Met Sci Heat Treat 15, 197–200 (1973). https://doi.org/10.1007/BF00648150

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  • DOI: https://doi.org/10.1007/BF00648150

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