NTPF “Etalon” (Magnitogorsk, Russia):

Shatokhin I. M., General Director

Tomsk State University (Tomsk, Russia):
Ziatdinov M. Kh., Dr. Eng., Leading Researcher

Nosov Magnitogorsk State Technical University (Magnitogorsk, Russia):
Manashev I. R., Cand. Eng.
Kartunov A. D., Head of Technical Dept.

Magnitogorsk Iron and Steel Works (Magnitogorsk, Russia):

Shiryaev O. P., Deputy General Director on Production

E-mail: mirney@yandex.ru

Gavrilova T. O., Deputy general director of NPTF “Etalon”, participated in this research.

The results of studies on the production of a new class of alloying materials in the combustion mode are presented on the example of synthesis of composite alloys based on vanadium, chromium and silicon nitrides. Principal possibility of creation of the SHS production of various composite ferroalloys for steelmaking was proved when using conventional ferroalloys as a raw material. It is shown that the degree of nitriding of ferroalloys in the conditions of filtration combustion strongly depends on the pressure of nitrogen, initial material powder dispersity and porosity of the nitride samples. The higher is the nitrogen pressure, the greater is the porosity of the samples and the larger are particles of the original ferroalloy powder, and the greater is the amount of nitrogen fixed in the combustion products. More dense samples and samples of the larger ferroalloy powder are nitrided in a more narrow range of nitrogen pressure. To initiate a stable layer-by-layer combustion it is required to provide higher pressure in such samples. It is shown that nitriding of initial ferroalloy can occur either by solid-phase (ferrochromium) or by liquid-phase (ferrosilicium, ferrovanadium) mechanisms, depending on the composition of initial ferroalloy. In the first case, the combustion temperature is below the melting point of the initial alloy and eutectic in the system Cr–Fe–N. In the second case it is higher. When solid-phase nitriding takes place, ferroalloy saturation with nitrogen always occurs step-by-step — at layer-by-layer combustion and volumetric additional burning. When liquid-phase nitriding takes place, nitrogen absorption can occur in one or in two stages depending on the amount of liquid phase in the combustion wave. When forming large amount of combustion products (e.g. ferrovanadium) after melting, additional nitriding is absent. When fraction of liquid combustion products (e.g ferrosilicium) is lower, contribution of additional nitriding is significant.

1. Merzhanov A. G., Borovinskaya I. P. Self-propagating high-temperature synthesis of refractory inorganic compounds. Doklady AN SSSR. 1972. Vol. 204. pp. 366-369.
2. Merzhanov A. G. Scientific grounds, achievements and development prospects of the processes of solid flame combustion. Izvestia RAN. Seriya khimicheskaya. 1997. Vol. 46. No. 1. pp. 7–31.
3. Levashov E. A., Mukasyan A. S., Rogachev A. S., Shtansky D. V. Self-propagating high-temperature synthesis of advanced materials and coatings. International Materials Reviews, 2017. Vol. 62. No. 4. pp. 203–239.
4. Mukasyan A. S., Rogachev A. S, Aruna S. T. Combustion synthesis in nanostructured reactive systems. Advanced Powder Technology. 2015. Vol. 26. No. 3. pp. 954–976.
5. Ziatdinov M. Kh., Shatokhin I. M., Leontyev L. I. SHS Technology for Composite Ferroalloys. 1. Metallurgical SHS: Nitride of Ferrovanadium and Ferrochromium. Steel in Translation. 2018. Vol. 48. No. 5. pp. 269–276.
6. Maksimov Y. M., Ziatdinov M. Kh., Merzhanov A. G., Raskolenko L. G., Lepakova O. K. Сombustion of vanadium-iron alloys in nitrogen. Combustion, Explosion, and Shock Waves. 1984. Vol. 20. Iss. 5. pp 487–492.
7. Chukhlomina L. N., Maksimov Yu. M., Kitler V. D., Vitushkina O.G. Mechanism and features of nitriding of ferrosilicon in the combustion regime. Combustion, Explosion, and Shock Waves. 2006. Vol. 42. Iss. 3. pp 309–316.
8. Braverman B. Sh., Maksimov Yu. M., Tsybulnik Yu. V. Possibility of Nitriding Industrial Ferroalloys in a Nitrogen-Containing Gas Flow. Combustion, Explosion, and Shock Waves. 2012. Vol. 48. Iss. 6. pp. 34–35.
9. Bolgaru K. A., Chukhlomina L. N., Maksimov Y. M. Study of regularities for the nitriding of complex ferrosilicoaluminum ferroalloy during SHS. Izvestiya vuzov. Poroshkovaya metallurgiya i funktsional’nye pokrytiya. 2016. Vol. 4. pp. 34–40.
10. Munir Z. A., Holt J. B. The combustion synthesis of refractory nitrides. Part 1. Theoretical analysis. Journal of Materials Science. 1987. Vol. 22. Iss. 2. pp. 710–714.
11. Chukin M. V., Poletskov P. P., Nikitenko O. A., Nabatchikov D. G. Study of Microstructure of Rolled heavy Plates Made of Low-alloyed Pipe Steel with Increased Strength and Cold Resistance. CIS Iron and Steel Review. 2017. Vol. 13. pp. 28–32.
12. Tian P., Zhong Z. Y., Bai R. G., Zhang X. L., Gao H. Application of Different Vanadium Alloys in Steel. Proceedings of the International Conference on Computer Information Systems and Industrial Applications (CISIA 2015). Bangkok, Thailand on June 28–29, 2015. pp. 861–864.
13. Hanninen H. E. Application and Performance of high Nitrogen Steels. Steel GRIPS. 2004. No. 2. pp. 371–380.
14. Kaputkina L. M., Svyazhin A. G., Smarygina I. V., Kindop V. E. Influence of Nitrogen and Copper on Hardening of Austenitic Chromiumnickel-manganese Stainless Steel. CIS Iron and Steel Review. 2016. Vol. 11. pp. 30–34.
15. Mukasyan A. S., Merzhanov A. G., Martinenko V. M., Borovinskaya I. P. Blinov M. Y. Mechanism and Principles of Silicon Combustion in Nitrogen. Combustion Explosion Shock Waves. 1986. Vol. 22. No. 5. pp. 534–540.
16. Ziatdinov M. Kh., Shatokhin I. M., Leontyev L. I. SHS Technology for Composite Ferroalloys. 2. Synthesis of Ferrosilicon Nitrides and Ferrotitanium Boride. Steel in Translation. 2018. Vol. 48. No. 7. pp. 411–418.
17. Shatokhin I. M., Ziatdinov M. Kh., Smirnov L. A., Manashev I. R. Nitrided Ferroalloy Production By Metallurgical SHS Process: Scientific Foundations and Technology. Theoretical and practical conference with international participation and School for young scientists “FERROALLOYS: Development prospects of metallurgy and machine building based on completed Research and Development”. KnE Materials Science. 2019. pp. 191–206. DOI: 10.18502/kms.v5i1.3969