Obrabotka Metallov 2015 No. 4

ОБРАБОТКА МЕТАЛЛОВ № 4 (69) 2015 70 МАТЕРИАЛОВЕДЕНИЕ OBRABOTKAMETALLOV (METAL WORKING AND MATERIAL SCIENCE) N 4(69), October – December 2015, Pages 61–71 Welding of dissimilar materials with interlayers employment containing copper and tantalum Maliutina Iu.N. 1 , Ph.D. student, e-mail: iuliiamaliutina@gmail.com Stepanova N.V. 1 , Junior researcher, e-mail: naty@ya.ru Cherkov A.G. 2 , Technologist, e-mail: cher@isp.nsc.ru Chuchkova L.V. 1 , Student, e-mail: twitty-kun@mail.ru 1 Novosibirsk State Technical University, 20 Prospect K. Marksa, Novosibirsk, 630073, Russian Federation 2 Rzhanov Institute of Semiconductor Physics of the Siberian Branch of the RAS, 13Ac. Lavrentieva ave., Novosibirsk, 630090, Russian Federation Abstract Investigations of welded joints as well as strength properties of composites formed by explosive welding of plates from titanium alloy VT20 and stainless steel 09Cr18Ni10Ti with interlayer’s employment are conducted. The duty of interlayers are performed by the plates of tantalum or «brass – tantalum». It results in the suppression of brittle in- termetallic phase’s formation in the joining zone and obtaining the welds characterized by lack of defects that reduce fracture strength of materials. By the means of a microstructural analysis it is found that in the bonding zone the cop- per and iron as well as titanium and tantalum based solid solutions are formed. By the means of a transmission elec- tron microscopy the deformation twins are detected in some grains of melted zone between copper alloy and stainless steel. There is evidence that twinning is the predominant deformation mechanism of explosive welding process. At the welding interface of brass and tantalum plates the structure represents a mechanical mixture of copper and nano dispersive inclusions of β – tantalum. The level of layers joining strength is used as a criterion of mechanical proper- ties of composite materials. The maximum ultimate strength 420 MPa is characteristic of composite materials with interlayers from brass and tantalum. The strength of composite materials with tantalum plate as interlayer is 22 % less than the composite with «brass – tantalum» interlayers. This reduction is probably due to the molten zones formation in the thin surfaces layers of plates between stainless steel and tantalum. During crystallization of these zones the low plastic tantalum and iron based chemical compounds were formed. Insertion of two layered «brass – tantalum» interlayer between stainless steel and titanium alloy is reasonable to increase the strength properties of composites. Keywords : explosive welding, interlayer, bonding structure, layers joining strength. DOI: 10.17212/1994-6309-2015-4-61-71 References 1. Chechulin B.B., Ushkov S.S., Razuvaeva I.N., Goldfain V.N. Titanovye splavy v mashinostroenii [Titanium alloys in engineering]. Leningrad, Mashinostroenie Publ., 1977. 248 p. 2. Leyens C., Peters M. Titanium and titanium alloys. Fundamentals and applications. Weinheim, Wiley-VCH Verlag, 2003. 532 p. ISBN 978-3-527-30534-6 3. Orishich A.M., Cherepanov A.N., Shapeev V.N., Pugacheva N.B. Nanomodifitsirovanie svarnykh soedinenii pri lazernoi svarke metallov i splavov [Nanomodification of welded joints by laser welding of metals and alloys]. Novosibirsk, SB RAS Publ., 2014. 252 p. ISBN 978-5-7692-1379-3 4. Ryabov V.R., Rabkin D.M., Kurochko R.S., Strizhevskaya L.G. Svarka raznorodnykh metallov i splavov [Welding of dissimilar metals and alloys]. Moscow, Mashinostroenie Publ., 1984. 239 p. 5. Bataev I.A., Bataev A.A., Mali V.I., Pavliukova D.V. Structural and mechanical properties of metallic– intermetallic laminate composites produced by explosive welding and annealing. Materials and Design , 2013, vol. 35, pp. 225–234. doi: 10.1016/j.matdes.2011.09.030 6. Pavliukova D.V., Bataev I.A., Mali V.I., Zhuravina T.V., Makarova E.B., Yartsev P.S. Neodnorodnost’ plasticheskoi deformatsii titanovykh splavov pri vysokoskoprostnom nagruzhenii v protsesse svarki vzryvom [Inhomogeneity of the plastic flow of titanium alloys under the high-speed loading during the explosion welding process]. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) – Metal Working and Material Science , 2011, no. 2 (51), pp. 46–47.