Skip to main content
SpringerLink
Log in

Thermodynamic analysis of carbide-layer formation in steel with microarc saturation by molybdenum

  • Published:
Steel in Translation Aims and scope

Abstract

Existing systems for diffusional saturation with molybdenum have numerous problems. The use of microarc treatment for this purpose is investigated. A steel sample is immersed in coal powder and heated by current transmission. Ammonium molybdate is the source of the molybdenum. The pyrolysis of coal is accompanied by the emission of hydrogen, methane, carbon dioxide, and carbon monoxide, which form a protective atmosphere and may reduce molybdenum to the atomic state. To identify the most likely chemical reactions, we calculate the standard change in Gibbs energy. The temperature ranges in which molybdenum trioxide is reduced to obtain molybdenum dioxide and atomic molybdenum are determined. The calculation results are verified experimentally. Simultaneous diffusion of carbon and molybdenum leads to the formation of a carbide coating (thickness 80–150 μm), with microhardness 13.5–15.0 GPa.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. Borisenok, G.V., Vasil’ev, L.A., and Voroshnin, L.G., Khimiko-termicheskaya obrabotka metallov i splavov (Chemical Thermal Treatment of Metals and Alloys), Lyakhovich, L., Ed., Moscow: Metallurgiya, 1981.

  2. Lakhtin, Yu.M. and Arzamasov, B.N., Khimiko-termicheskaya obrabotka metallov (Chemical Thermal Treatment of Metals), Moscow: Metallurgiya, 1985.

    Google Scholar 

  3. Loskutov, V.F., Khizhnyak, V.G., Kunitskii, Yu.A., and Kindrachuk, M.V., Diffuzionnye karbidnye pokrytiya (Diffused Carbide Coatings), Kiev: Tekhnika, 1991.

    Google Scholar 

  4. Voroshnin, L.G., Mendeleeva, O.L., and Smetkin, V.A., Teoriya i tekhnologiya khimiko-termicheskoi obrabotki (Theory and Technology of Chemical Thermal Treatment), Moscow: Novoe Znanie, 2010.

    Google Scholar 

  5. Voroshnin, L.G., Bashlak, S.D., Khina, B.B., and Shmatov, A.A., Mnogokomponentnye diffuzionnye karbidnye pokrytiya na zhelezouglerodistykh splavakh (Multicomponent Diffused Carbide Coatings on IronCarbon Alloys), Minsk: Beloruss. Nats. Tekhn. Univ., 2007.

    Google Scholar 

  6. Dombrovskii, Yu.M. and Stepanov, M.S., Microarc carburizing of steel items in powder media, Uprochnyayushchie Tekhnol. Pokrytiya, 2013, no. 12, pp. 25–29.

    Google Scholar 

  7. Dombrovskii, Yu.M. and Stepanov, M.S., Microarc chrome plating: analysis of main reactions, in Mater. 3-i mezhd. nauchno-prakt. konf. “Innovatsionnye materially i tekhnologii v mashinostroitel’nom proizvodstve,” Novotroitsk, 25 aprelya 2014 g. (Proc. Third Int. Sci.Pract. Conf. “Innovative Materials and Technologies in Machine-Building Production,” Novotroitsk, April 25, 2014), Novotroitsk: Mosk. Inst. Stalei Splavov, 2014, pp. 57–58.

    Google Scholar 

  8. Stepanov, M.S., Formation of carbide coating at microarc chrome plating of steel, Uprochnyayushchie Tekhnol. Pokrytiya, 2015, no. 1, pp. 35–38.

    Google Scholar 

  9. Makarov, G.N., Kharlampovich, G.D., Korolev, Yu.G., et al., Khimicheskaya tekhnologiya tverdykh goryuchikh iskopaemykh (Chemical Technology of Solid Fossil Fuels), Moscow: Khimiya, 1986.

    Google Scholar 

  10. Lipovich, V.G., Kalabin, G.A., Kalechits, I.V., et al., Khimiya i pererabotka uglya (Chemistry and Conversion of Coal), Moscow: Khimiya, 1988.

    Google Scholar 

  11. Glushchenko, I.M., Teoreticheskie osnovy tekhnologii goryuchikh iskopaemykh (Theoretical Technological Basis of Fossil Fuels), Moscow: Metallurgiya, 1990.

    Google Scholar 

  12. Gyul’maliev, A.M., Golovin, G.S., and Gladun, T.G., Teoreticheskie osnovy khimii uglya (Theoretical Basis of Coal Chemistry), Moscow: Mosk. Gos. Gorn. Univ., 2003.

    Google Scholar 

  13. Morachevskii, A.G. and Sladkov, I.B., Termodinamicheskie raschety v metallurgii (Thermodynamic Calculations in Metallurgy), Moscow: Metallurgiya, 1985.

    Google Scholar 

  14. Morachevskii, A.G., Fiziko-khimicheskie svoistva molekulyarnykh neorganicheskikh soedinenii (eksperimental’nye dannye i metody rascheta) (Physical and Chemical Properties of Molecular Inorganic Compounds: Experimental Data and Calculation Methods), St. Petersburg: Khimiya, 1996.

    Google Scholar 

  15. Kazachkov, E.A., Raschety po teorii metallurgicheskikh protsessov (Calculations of the Theory of Metallurgical Processes), Moscow: Metallurgiya, 1988.

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Don State Technical University, Rostov-on-Don, Russia

    M. S. Stepanov & Yu. M. Dombrovskii

Authors
  1. M. S. Stepanov
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Yu. M. Dombrovskii
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to M. S. Stepanov.

Additional information

Original Russian Text © M.S. Stepanov, Yu.M. Dombrovskii, 2016, published in “Izvestiya VUZ. Chernaya Metallurgiya,” 2016, No. 2, pp. 77–81.

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Stepanov, M.S., Dombrovskii, Y.M. Thermodynamic analysis of carbide-layer formation in steel with microarc saturation by molybdenum. Steel Transl. 46, 79–82 (2016). https://doi.org/10.3103/S0967091216020169

Download citation

  • Received:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.3103/S0967091216020169

Keywords

Search

Navigation