Abstract
This work considers the development and the application of combined severe plastic deformation (SPD) techniques to produce contact wire with an enhanced complex of physical, mechanical, and service properties used for high-speed railway lines. This type of processing can be used as an alternative to most conventional production methods, including rolling and drawing. The proposed technique is based on the combination of radial swaging and equal-channel angular pressing, bundled with the wire-forming process. Laboratory contact wire samples with an enhanced complex of physical, mechanical, and service properties were produced during physical experiments. The composition of processed alloy samples meets modern requirements for contact wires for high-speed railways. Ultimate tensile strength of 560 ± 20 MPa, electrical conductivity of 76 ± 2% IACS, and relative tensile elongation of 20 ± 2% are achieved through the formation of a band structure. Fragments of 300 ± 20 nm were formed inside strips with the precipitation of secondary phase particles of 20–100 nm along the fragment boundaries, mainly during the aging process.
Highlights
The most common method for producing contact wires [1,2,3] is combined processing, including several separate technological processes: continuous casting and rolling to obtain wire rod, drawing or rolling of wire rod to form a profile, and a finishing hardening heat treatment [4,5,6,7,8,9,10]
Drawing or rolling operations have been replaced by the continuous pressing of wire rods on extruders according to the traditional Conform scheme, which provides economic advantages due to the quick changeover of the line, reduction in production areas, and the range of equipment when receiving contact wires [11,12,13,14,15,16,17]
In this paper, we propose and study a method for continuously producing a contact wire under conditions of continuous casting of a billet, its crystallisation, and forming, using alternating forging and ECAP-C methods
Summary
The most common method for producing contact wires [1,2,3] is combined processing, including several separate technological processes: continuous casting and rolling to obtain wire rod, drawing or rolling of wire rod to form a profile, and a finishing hardening heat treatment [4,5,6,7,8,9,10]. The most promising applications for obtaining long products can be quite productive SPD processes with alternating forging (radial) and/or the method of equal channel angular pressing according to the Conform scheme (ECAP-C). In this regard, in this paper, we propose and study a method for continuously producing a contact wire under conditions of continuous casting of a billet, its crystallisation, and forming, using alternating (radial) forging and ECAP-C methods. One should take into account that the use of large deformations during SPD leads to large thermal effects from deformation
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