Obrabotka Metallov. 2016 no. 4(73)

ОБРАБОТКА МЕТАЛЛОВ № 4 (73) 2016 72 МАТЕРИАЛОВЕДЕНИЕ OBRABOTKAMETALLOV (METAL WORKING AND MATERIAL SCIENCE) N 4 (73), October – December 2016, Pages 63–74 Structure and properties of TiB-TiC-Ti layers fabricated on cp-titanium substrates by electron beam cladding Lenivtseva O.G. 1 , Ph.D. (Engineering), Senior Researcher, Associate Professor, e-mail: lenivtseva_olga@mail.ru Drobyaz E.A. 1 , Ph.D. (Engineering), Associate Professor, e-mail: ekaterina.drobyaz@yandex.ru Gontarenko A.S. 2, 1 , Junior researcher, Assistant, e-mail: gontarenko@iw.uni-hannover.de Zimogliadova T.A. 1 , Ph.D. student, e-mail: zimogliadovatatiana@gmail.com Chuchkova L.V. 1 , Master’s Degree student, e-mail: l_chuchkova@bk.ru 1 Novosibirsk State Technical University, 20 Prospect K. Marksa, Novosibirsk, 630073, Russian Federation 2 Leibniz University of Hannover, 2 University str., Garbsen, 30823, Germany Abstract The influence of non-vacuum electron beam treatment modes on the structure and properties of wear resistant TiB-TiC-Ti layers formed on the surface of VT1-0 titanium alloy is investigated. Amixture of titanium, boron carbide and flux powders is used as filler. The structure and phase composition of the layers are investigated by the means of optical microscopy and scanning electron microscopy, and X-ray diffractometry. The experiments resulted in the formation of layers with the thickness of 3.4 mm consisting of α (α´)-Ti, titanium carbide and titanium monoboride. Structural investigations revealed a high volume fraction of TiC and TiB reinforcing compounds contributed in the formation of cracks in the cladded layers. Variation of technological regimes of the electron beam treatment affected the hardness of cladded layers. Treatment of the sample containing 20 wt. % of boron carbide in a filler with a beam current of 22 µA led to the formation of the layer with hardness of 582 HV. This value was about 3.5-fold higher than titanium microhardness. Increase of a beam current by 1 µA resulted in decrease of the microhardness level to 543 HV. Treatment of the sample containing 12 wt. % of boron carbide in a filler led to the formation of the layer with hardness of 436 HV. Wear resistance of fabricated materials is estimated in the conditions of friction by non-rigidly fixed abrasive particles. The best characteristics possessed the layers obtained by cladding of 20 wt. % boron carbide. Intensity of wear of the coated samples was 8-fold lower comparing to cp-titanium. Keywords Electron beam cladding, titanium, titanium carbide, titanium boride, microhardness, wear resistance DOI: 10.17212/1994-6309-2016-4-63-74 References 1. Leyens С., Peters M., eds. Titanium and titanium alloys: fundamentals and applications . Weinheim, Wiley- VCH, 2005. 532 p. ISBN 978-3-527-30534-6. 2. Dong H. Tribological properties of titanium-based alloys. Surface Engineering of Light Alloys . Oxford, Wood- head Publishing, 2010, pp. 58–80. ISBN 978-1-845-69945-1. 3. Miller P.D., Holladay J.W. Friction and wear properties of titanium. Wear , 1958, vol. 2, pp. 133–140. doi: 10.1016/0043-1648(58)90428-9 4. Rabinowicz E. Friction properties of titanium and its alloys. Metal Progress , 1954, vol. 65 (2), pp. 107–110. 5. Alam M.O., Haseeb A.S.M.A. Response of Ti–6Al–4V and Ti–24Al–11Nb alloys to dry sliding wear against hardened steel. Tribology International , 2002, vol. 35, iss. 6, pp. 357–362. doi: 10.1016/S0301-679X(02)00015-4 6. Budinski K.G. Tribological properties of titanium alloys. Wear , 1991, vol. 151, iss. 2, pp. 203–217. doi: 10.1016/0043-1648(91)90249-T 7. Sun R.L., Lei Y.W. Microstructure and wear resistance of laser clad layer of TiN on TC4 alloy. Journal of Tianjin Polytechnic University , 2007, vol. 26, iss. 4, pp. 57–59.