THERMODYNAMIC ANALYSIS OF FORMATION REACTION OF A CARBIDE LAYER IN STEEL AT MICROARC MOLYBDENUM SATURATION
https://doi.org/10.17073/0368-0797-2016-2-77-81
Abstract
Known technologies of diffusion molybdenum saturation of steel products are characterized by a number of disadvantages. The article presents the investigations of the diffusion saturation process of molybdenum by microarc chemical-thermal treatment technology. The steel sample has been dipped into the coal powder and heated by electric current. Ammonium molybdate has been used as a source of diffusant. The standard change of Gibbs energy has been calculated to identify the most probable chemical reactions. The authors have defined temperature intervals of reduction reactions of molybdenum trioxide with the formation of molybdenum dioxide and atomic molyb denum. An experimental verification of the results has been made. Carbide coating has been received with the thickness of 80 – 150 microns with a microhardness of 13.5 to 15.0 GPA.
About the Authors
M. S. Stepanov
Don State Technical University, Rostov-on-Don, Russia
Russian Federation
Russian Federation
Cand. Sci. (Eng.), Assist. Professor of the Chair «Technology of Technical Regulation»
Yu. M. Dombrovskii
Don State Technical University, Rostov-on-Don, Russia
Russian Federation
Russian Federation
Dr. Sci. (Eng.), Professor of the Chair «Physical and Applied Material Science»
References
1. Borisenok G.V., Vasil’ev L.A., Voroshnin L.G. Khimiko-termicheskaya obrabotka metallov i splavov [Chemical thermal treatment of metals and alloys]. Lyakhovich L. ed. Moscow: Metallurgiya, 1981, 424 p. (In Russ.).
2. Lakhtin Yu.M., Arzamasov B.N. Khimiko-termicheskaya obrabotka metallov [Chemical thermal treatment of metals]. Moscow: Metallurgiya, 1985, 256 p. (In Russ.).
3. Loskutov V.F., Khizhnyak V.G., Kunitskii Yu.A., Kindrachuk M.V. Diff uzionnye karbidnye pokrytiya [Diff used carbide coatings]. Kiev: Tekhnika, 1991, 168 p. (In Russ.).
4. Voroshnin L.G., Mendeleeva O.L., Smetkin V.A. Teoriya i tekhnologiya khimiko-termicheskoi obrabotki [Theory and techno logy of chemical thermal treatment]. Moscow: Novoe znanie, 2010, 304 p. (In Russ.).
5. Voroshnin L.G., Bashlak S.D., Khina B.B., Shmatov A.A. Mnogokomponentnye diff uzionnye karbidnye pokrytiya na zhelezouglerodistykh splavakh [Multicomponent diff used carbide coatings on iron-carbon alloys]. Minsk: izd. BNTU, 2007, 468 p. (In Russ.).
6. Dombrovskii Yu.M., Stepanov M.S. Microarc carburizing of steel items in powder media. Uprochnyayushchie tekhnologii i pokrytiya. 2013, no. 12, pp. 25–29. (In Russ.).
7. Dombrovskii Yu.M., Stepanov M.S. Microarc chrome plating: analysis of main reactions. In.: Innovatsionnye materialy i tekhnologii v mashinostroitel’nom proizvodstve. Materialy 3-i mezhdunarodnoi nauchno-prakticheskoi konferentsii 25 aprelya 2014 g., Novotroitsk [Innovative materials and technologies in machine-building production. Proceedings of 3rd International Scientifi c conference on April 25, 2014, Novotroitsk]. Novotroitsk: izd. NITU «MISiS», 2014, pp. 57–58. (In Russ.).
8. Stepanov M.S. Formation of carbide coating at microarc chrome plating of steel. Uprochnyayushchie tekhnologii i pokrytiya. 2015, no. 1, pp. 35–38. (In Russ.).
9. Makarov G.N., Kharlampovich G.D., Korolev Yu.G. etc. Khimicheskaya tekhnologiya tverdykh goryuchikh iskopaemykh [Chemical technology of solid fossil fuels]. Moscow: Khimiya, 1986, 496 p. (In Russ.).
10. Lipovich V.G., Kalabin G.A., Kalechits I.V. etc. Khimiya i pererabotka uglya [Chemistry and conversion of coal]. Moscow: Khimiya, 1988, 336 p. (In Russ.).
11. Glushchenko I.M. Teoreticheskie osnovy tekhnologii goryuchikh iskopaemykh [Theoretical technological basis of fossil fuels]. Moscow: Metallurgiya, 1990, 296 p. (In Russ.).
12. Gyul’maliev A.M., Golovin G.S., Gladun T.G. Teoreticheskie osnovy khimii uglya [Theoretical basis of coal chemistry]. Moscow: izd. Moskovskogo gos. gornogo un-ta, 2003, 556 p. (In Russ.).
13. Morachevskii A.G., Sladkov I.B. Termodinamicheskie raschety v metallurgii [Thermodynamic calculations in metallurgy]. Moscow: Metallurgiya, 1985, 136 p. (In Russ.).
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, 312 p. (In Russ.).
15. Kazachkov E.A. Raschety po teorii metallurgicheskikh protsessov [Calculations of the theory of metallurgical processes]. Moscow: Metallurgiya, 1988, 288 p. (In Russ.).
Review
For citations:
Stepanov M.S., Dombrovskii Yu.M. THERMODYNAMIC ANALYSIS OF FORMATION REACTION OF A CARBIDE LAYER IN STEEL AT MICROARC MOLYBDENUM SATURATION. Izvestiya. Ferrous Metallurgy. 2016;59(2):77-81. (In Russ.) https://doi.org/10.17073/0368-0797-2016-2-77-81
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