Obrabotka Metallov 2013 No. 4

ОБРАБОТКА МЕТАЛЛОВ № 4 (61) 2013 56 МАТЕРИАЛОВЕДЕНИЕ Materials Science and Technology. – Vol. 2010. – P. 367–370. 15. Zhang K-M., Zou J-X., Li J., Yu Z-S., Wang H-P. Surface modification of TC4 Ti alloy by laser clad- ding with TiC+Ti powders // Transactions of Nonferrous Metals Society of China. – 2011. – Vol. 20. Iss. 11. – P. 2192–2197. 16. Kimura Y., Kaito C., Formation of carbon nano- tubes from mixture film of carbon and titanium // Phys- ica E: Low-Dimensional Systems & Nanostructures. – 2005. – Vol. 28. – P. 281–285. 17 . Yang Y.-L., Zhang D., Liu C.-S., Yang Y.-R. La- ser cladding of TiCN/Ti coatings on Ti6-Al4-V and the calculation of the temperature field // Optical Engineer- ing. – 2008. – Vol. 47(8). – P. 084301. 18. Covelli L., Pierdominici F., Smurov I., Tos- to S. Surface microstructure of titanium irradiated by Nd:YAG pulsed laser in presence of carbon and nitrogen // Surface and Coatings Technology. – 1996. – Vol. 78. – P. 196–204. 19. Hamedi M.J., Torkamany M.J., Sabbaghzadeh J. Effect of pulsed laser parameters on in-situ TiC synthesis in laser surface treatment // Optics and Lasers in Engi- neering. – 2011. – Vol. 49. – P. 557–563. 20. Bahadur S. Friction and wear behavior of tung- sten and titanium carbide coatings // Wear. –1996. – Vol. 196. – P. 156–163. Obrabotka metallov N 4(61), October–December 2013, Pages 49-57 Аtmospheric electron-beam overlay welding of carbon containing powder mixtures onto technically pure ti- tanium VT1-0 O.G. Lenivtseva, I.A Bataev, N.S. Belousova, E.D. Golovin, T.A. Zimoglyadova Novosibirsk State Technical University, Prospect K. Marksa, 20 Novosibirsk, 630073, Russia E-mail: lenivtseva_olga@mail.ru Received 1 October 2013 Revised 30 October 2013 Accepted 1 November 2013 Abstract The results of structure and properties investigations of the surface alloyed titanium substrate layers are discussed in present work. Built-up layers are produced by the electron-beamoverlaywelding of carbon-containing powdermixtures in the air. The powder mixtures of titanium, niobium and graphite as well as “niobium – graphite” and “titanium - graphite” compositions are used as the alloying materials. To protect materials from the influence of atmospheric gases during overlay welding, 50 % of the flux (CaF 2 ) was added to the powder mixture. The electron beam overlay welding allows to produce the high quality coatings with a thickness up to 1.7 mm. X-ray analysis of built-up layers revealed the presence of TiC, α-Ti and residual graphite phase. As a result of the treatment microhardness of surface layers increased from 1.8 to 4.8 GPa. The coatings produced by the method of electron beam overlay welding showed enhanced wear resistance in conditions of friction against non-rigidly fixed abrasive particles. Wherein the formation of coatings on titanium surfaces doesn’t cause the dramatically decrease of the material impact toughness. Keywords: Cp titanium, titanium carbide, electron-beam cladding, wear resistance, microhardness. References 1. Lashhenko G.I. Plazmennoe uprochnenie i napylenie [Plasma hardening and coating]. Kiev, Ekotehnologija, 2003. 65 p. 2. Hasui A., Morigaki O. Naplavka i napylenie [Surfacing and spraying]. Trans. Japan. Moscow, Mashinostroenie, 1985. 240 p.