Structure and properties of the contact wire obtained by ECAP with forming

Denis Alekseevich  AKSENOV; Rashid Nailevich  ASFANDIYAROV; Georgy Iosifovich  RAAB; Yulia Ramilevna  SEMENTEEVA; Elvira Ildarovna  FAKHRETDINOVA

doi:10.55713/jmmm.v33i3.1619

Authors

Denis Alekseevich AKSENOV Institute of Molecule and Crystal Physics UFRC RAS, 151 Prospect Oktyabrya, Ufa, 450075, Russia; Ufa University of Science and Technology, 32 Z. Validi St., Ufa, 450076, Russia
Rashid Nailevich ASFANDIYAROV Institute of Molecule and Crystal Physics UFRC RAS, 151 Prospect Oktyabrya, Ufa, 450075, Russia; Ufa University of Science and Technology, 32 Z. Validi St., Ufa, 450076, Russia
Georgy Iosifovich RAAB Nosov Magnitogorsk State Technical University, 38 Prospect Lenina, Magnitogorsk, 455000, Russia
Yulia Ramilevna SEMENTEEVA Nosov Magnitogorsk State Technical University, 38 Prospect Lenina, Magnitogorsk, 455000, Russia
Elvira Ildarovna FAKHRETDINOVA Institute of Molecule and Crystal Physics UFRC RAS, 151 Prospect Oktyabrya, Ufa, 450075, Russia; Ufa University of Science and Technology, 32 Z. Validi St., Ufa, 450076, Russia

DOI:

https://doi.org/10.55713/jmmm.v33i3.1619

Keywords:

ECAP, Cu-Cr, deformation heating, contact wire, Conductivity

Abstract

This paper presents the results of the development of a promising method for manufacturing contact wires for high-speed railways. The developed method is based on the principles of severe plastic deformation and the combination of metal-forming processes. The solution obtained is a combination of equal-channel angular pressing with the forming of a shaped contact wire with a cross-sectional area of 120 mm2 in one tooling. A feature of the work is that with the help of a comprehensive study by the methods of finite element computer modeling and a physical experiment, not only the stress-strain state of the deformation zone was investigated but also an analysis was made of the effect of deformation heating, which plays an important role when working with dispersion-hardened alloys, such as Cu-0.65Cr. It was established that the temperature in the equal-channel angular pressing zone reached 490℃ to 505℃, and during shaping, it rose to 510℃ to 530℃. In the course of a physical experiment, a laboratory sample of a contact wire with a tensile strength of 410 ± 8 MPa and an electrical conductivity of 35 ± 2% IACS was obtained. Post-deformation aging led to an increase in tensile strength up to 540 ± 20 MPa and restoration of electrical conductivity up to 76 ± 2% IACS. Due to the formation of a stripe structure of a grain-subgrain type with recrystallized grains along the boundaries, the plasticity of the contact wire sample reached 20%.

Downloads

Download data is not yet available.

References

Y. Loginov. Copper and Deformable Copper Alloys. Ekaterinburg: UGTU, 2006. (In Russian)

V. Ya. Berent, "Improving the wires of the contact network", Bulletin of VNIIZhT, vol. 3, pp. 40-45, 2012. (In Russian)

Q. Liu, "Effect of processing and heat treatment on behavior of Cu-Cr-Zr alloys to railway contact wire," Metallurgical and Materials Transactions A, vol. 37, 3233, 2006.

GOST R 55647-2013 Contact wires made of copper and its alloys for electrified railways. (In Russian)

I. A. Faizov, G. I. Raab, S. N. Faizova, D. A. Aksenov, N. G. Zaripov, "The role of phase transformations in the evolution of dispersed particles in chrome bronzes during equal-channel angular pressing," Letters on materials, vol. 6, no. 2, pp. 132-137, 2016.

A. Vinogradov, V. Patlan, Y. Suzuki, and K. Kitagawa, "Structure and properties of ultra-fine grain Cu–Cr–Zr alloy produced by equal-channel angular pressing," Acta Materialia, vol. 50, pp. 1639-1651, 2002.

D. V. Shangina, N. R. Bochvar, and S. V. Dobatkin, "Structure and properties of Cu-Cr alloys subjected to shear under pressure and subsequent heating," Russian Metallurgy (Metally), vol. 2010, no. 11, pp. 1046-1052, 2010.

D. A. Aksenov, R. Asfandiyarov, G. I. Raab, and G. B. Isyandavletova, "Features of the physico-mechanical behavior of UFG low-alloyed bronze Cu-1Cr-0.08Zr produced by severe plastic deformation," IOP Conference Series: Materials Science and Engineering, vol. 179, no. 1, 012001, 2017.

A. Vinogradov, V. Patlan, Y. Suzuki, K. Kitagawa, V. Kopylov, "Structure and properties of ultra-fine grain Cu–Cr–Zr alloy produced by equal-channel angular pressing," Acta Materialia, vol. 50, no. 7, pp. 1639-1651, 2002.

A. Morozova, R. Mishnev, A. Belyakov, and R. Kaibyshev, "Microstructure and properties of fine-grained Cu-Cr-Zr alloys after termo-mechanical treatments," Reviews on Advanced Materials Science, vol. 54, no.1, pp. 56-92, 2018.

F. J. Humphreys, M. Hatherly, Recrystallization and related annealing phenomena. Elsevier, 2012.

A. Morozova, A. Lugovskaya, A. Pilipenko, M. Tkachev, G. Raab, A. Belyakov, and R. Kaibyshev, "Microstructure of a low alloyed Cu-Cr-Zr alloy after ECAP Conform," IOP Conference Series: Materials Science and Engineering, vol. 1014, 012029, 2021.

A. I. Morozova, A. N. Belyakova, and R. O. Kaibysheva, "The effect of the deformation temperature on the formation of an ultrafine-grained structure in a heat-strengthened Cu-Cr-Zr alloy," Physics of Metals and Metallography, vol. 122, pp. 60-66, 2021.

D. A. Aksenov, R. N. Asfandiyarov, G. I. Raab, E. I. Fakhretdinova, and M. A. Shishkunova "Influence of the chromium content in low-alloyed Cu–Cr alloys on the structural changes, phase transformations and properties in equal-channel angular pressing," Metals, vol. 11, no. 11, 1795, 2021.

M. Goto, S. Kawakita, Y. Mae, and other, “Method for producing wire for electric railways,” U.S. Patent 5391243, Feb, 21, 1995.

H. Nagasawa, S. Aoki, S. Kawakita, and other, “Production of copper alloy trolley wire and hanging stringing,” Japan Patent 6154838, Jun 3, 1994.

T. Chandler, and J. Corrado, Copper trolley wire and method of manufacturing copper trolley wire, U.S. Patent 6077364, Jun. 20, 2000.

M. Asai, S. Shinozaki, K. Sato, and other, Copper alloy for trolley wire, Japan Patent 3072042, Mar. 27, 1991.

N. Kubo, K. Nanjo, T. Sano, and other, Trolley wire and manufacturing method, Japan Patent 4171907, 29.10.2008.

H. Kuroda, H. Hiruta, and M. Aoyama, “Copper alloy material, copper alloy conductor and its production method, trolley wire for overhead contact wire, and cable,” Japan Patent 5147040, Feb. 20, 2013.

P. Chen, Copper-base alloy and its technology, China Patent 1250816, Apr. 12, 2006.

Yun-Xiang Tong, Yu Wang, Zhi-Min Qian, Dian-Tao Zhang, L. Li, and Yu-Feng Zheng, "Achieving high strength and high electrical conductivity in a CuCrZr alloy using equal-channel angular pressing", Acta Metallurgica Sinica (English Letters), vol. 31, pp. 1084-1088, 2018.

G. Purcek, H. Yanar, O. Saray, I. Karaman, and H. J. Maier, "Effect of precipitation on mechanical and wear properties of ultrafine-grained Cu-Cr-Zr alloy," Wear, vol. 311, pp. 149-158, 2014.

A. P. Zhilyaev, A. Shakhova, A. Morozova, A. Belyakov, R. Kaibyshev, "Grain refinement kinetics and strengthening mechanisms in Cu-0.3Cr-0.5Zr alloy subjected to intense plastic deformation", Materials Science and Engineering A, vol. 654, pp. 131-142, 2016.

R. Mishnev, I. Shakhova, A. Belyakov, and R. Kaibyshev, "Deformation microstructures, strengthening mechanisms, and electrical conductivity in a Cu-Cr-Zr alloy", Materials Science and Engineering A, vol. 629, pp. 29-40, 2015.