Obrabotka Metallov 2013 No. 4

ОБРАБОТКА МЕТАЛЛОВ № 4 (61) 2013 48 МАТЕРИАЛОВЕДЕНИЕ Obrabotka metallov N 4(61), October–December 2013, Pages 43-48 Multilayered electron-beam overlay welding of the tantalum-containing powder mixtures on the commercial pure titanium 1 M.G. Golkovsky, 2 V.V. Samojlenko, 2 A.I. Popeliukh, 2 A.A. Ruktuev, 2 N.V. Plotnikova, 2 N.S. Belousova 1 Institute of Nuclear Physics, Prospect akademika Lavrentieva, 11, Novosibirsk, 630090, Russia 2 Novosibirsk State Technical University, Prospekt K. Marksa, 20, Novosibirsk, 630073, Russia E-mail: Alex47@211.ru Received 5 October 2013 Revised 12 November 2013 Accepted 15 November 2013 Abstract The technology of multilayer tantalum-containing coatings formation by non-vacuum electron-beam overlay welding on the surface of the workpiece made of commercially pure titanium ВТ1-0 is suggested. The technology allows to create defect-free coatings with a thickness of 4.5 mm. The structure of overlay welded layers are investigated by optical and scanning electron microscopy. The coatings have a complex gradient structure, that vary in depth of the layer. An assessment of the level of mechanical properties and corrosion resistance is performed. Tantalum overlay welding leads to the materials’ hardening, but decreases the toughness in comparison with a pure titanium. Tantalum surface electron beam doping of titanium reduces the rate of its corrosion in a boiling nitric acid more than 100 times. Keywords: non-vacuum electron-beam treatment, corrosion resistance, titanium, tantalum References 1. Kapoor K, Vivekanand K., Gopalkrishna T., Saneal T., De P.K. High corrosion resistant Ti – 5 % Ta - 1.8 % Nb alloy for fuel reprocessing applicationю Journal of Nuclear Materials. 2003, Vol. 322, pp. 36-44. 2. Ningshen S., Kamachi Mudali U., Mukherjee P., Sarkar A., Barat P., Padhy N., Raj B., Ningshen S. Influence of oxygen ion irradiation on the corrosion aspects of Ti-5%Ta-2Nb alloy and oxide coated titanium. Corrosion Sci- ence. 2008, Vol. 50, pp. 2124-2134. 3. Raj B., Mudali U.K. Materials development and corrosion problems in nuclear fuel reprocessing plants. Prog- ress in Nuclear Energy. 2006, Vol. 48, pp. 283-313. 4. Mythili R., Saroja S., Vijayalakshmi M., Raghuna V.S. Selection of optimum microstructure for improved cor- rosion resistance in a Ti-5%Ta-1.8%Nb alloy. Journal of Nuclear Materials. 2005, Vol. 345, pp. 167-183. 5. De Souza K.A., Robin A. Influence of concentration and temperature on the corrosion behavior of titanium, titanium-20 and 40% tantalum alloys and tantalum in sulfuric acid solution. Materials Chemistry and Physics. 2007, Vol. 103, pp. 351-360. 6. Golkovski M.G., Bataev I.A., Bataev A.A., Ruktuev A.A., Zhuravina T.V., Kuksanov N.K., Salimov R.A., Bataev V.A. Atmospheric electron-beam surface alloying of titanium with tantalum. Materials Science and Engineer- ing. 2013, Vol. 578, pp. 310-317. 7. Zhuravina T.V., Bataev I.A., Ruktuev A.A., Alhimov A.P., Lenivceva O.G., Butylenkova O.A. Obrabotka met- allov (tehnologija, oborudovanie, instrumenty) , 2012, no. 1(54), pp. 90-95.