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

ผู้แต่ง

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

คำสำคัญ:

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

บทคัดย่อ

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%.

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