Welding of dissimilar materials with interlayers employment containing copper and tantalum
- Authors: Maliutina I.N1, Stepanova N.V1, Cherkov A.G2, Chuchkova L.V1
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Affiliations:
- Novosibirsk State Technical University
- Rzhanov Institute of Semiconductor Physics of the Siberian Branch of the RAS
- Issue: No 4 (2015)
- Pages: 61-71
- Section: MATERIAL SCIENCE
- URL: https://bakhtiniada.ru/1994-6309/article/view/302181
- DOI: https://doi.org/10.17212/1994-6309-2015-4-61-71
- ID: 302181
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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 intermetallic 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 copper and iron as well as titanium and tantalum based solid solutions are formed. By the means of a transmission electron 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 properties 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.
About the authors
Iu. N Maliutina
Novosibirsk State Technical University
Email: iuliiamaliutina@gmail.com
20, Prospect K. Marksa, Novosibirsk, 630073, Russian Federation
N. V Stepanova
Novosibirsk State Technical University
Email: naty@ya.ru
20, Prospect K. Marksa, Novosibirsk, 630073, Russian Federation
A. G Cherkov
Rzhanov Institute of Semiconductor Physics of the Siberian Branch of the RAS
Email: cher@isp.nsc.ru
13, Ac. Lavrentieva ave., Novosibirsk, 630090, Russian Federation
L. V Chuchkova
Novosibirsk State Technical University
Email: twitty-kun@mail.ru
20, Prospect K. Marksa, Novosibirsk, 630073, Russian Federation
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