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CN-115862958-B - High-strength high-toughness lightweight heterogeneous composite cable and preparation method thereof

CN115862958BCN 115862958 BCN115862958 BCN 115862958BCN-115862958-B

Abstract

The invention relates to a high-strength high-toughness lightweight heterogeneous composite cable and a preparation method thereof. The method comprises the steps of (1) performing rotary forging on steel bars at room temperature, performing rotary forging on magnesium alloy bars at high temperature, and (2) stranding, namely polishing and cleaning a plurality of heterogeneous steel bars and magnesium alloy bars which are identical in length and prepared in the step (1), arranging the heterogeneous steel bars and the magnesium alloy bars according to a rule of circumferentially alternating distribution, and sending the heterogeneous steel bars and the magnesium alloy bars into a stranding machine to twist into a heterogeneous steel-magnesium alloy composite cable. According to the invention, different deformation mechanisms of steel and magnesium alloy in the rotary forging deformation process are utilized to generate different grain refinement effects in the radial directions of two different bars, so that the heterogeneous steel and heterogeneous magnesium alloy bars with the grain sizes being completely opposite in radial distribution characteristics are obtained, and finally, the two bars which are alternately distributed and arranged in the circumferential direction are mechanically combined together through stranding, so that the structure-controllable high-strength high-toughness lightweight heterogeneous steel-magnesium alloy composite cable is obtained.

Inventors

  • CAO YANG
  • LI ZHENGHAO
  • XU MENGNING
  • Xia Weiheng
  • ZHAO YONGHAO
  • ZHOU HAO

Assignees

  • 南京理工大学

Dates

Publication Date
20260505
Application Date
20221209

Claims (7)

  1. 1. The preparation method of the high-strength high-toughness lightweight heterogeneous composite cable is characterized by comprising the following steps of: performing rotary forging, namely performing rotary forging deformation on the steel bar under the room temperature condition to obtain an heterogeneous steel bar, wherein the steel bar is in a softer coarse crystalline phase along the radial surface, the core part is in a harder fine crystalline phase, and the radial hardness of the heterogeneous steel bar is distributed in an inverted V shape; Performing rotary forging deformation on the magnesium alloy bar under the high-temperature condition to obtain an heterogeneous magnesium alloy bar, wherein the heterogeneous magnesium alloy bar has a structure that the radial surface is a harder fine crystalline phase, the core is a softer coarse crystalline phase, and the radial hardness of the heterogeneous magnesium alloy is distributed in a positive V shape; Twisting, namely grinding and cleaning a plurality of heterogeneous steel bars and heterogeneous magnesium alloy bars with the same length and prepared in the step (1) to remove greasy dirt and oxide skin on the surfaces, and then arranging the heterogeneous steel bars and the heterogeneous magnesium alloy bars according to a rule of alternately distributing along the circumferential direction and sending the heterogeneous steel bars and the heterogeneous magnesium alloy bars into a strander to twist into a heterogeneous steel-magnesium alloy composite cable; the steel bar rotary forging process parameters in the step (1) are that the deformation temperature is room temperature, the spindle rotating speed is 80-205 rpm, the feeding speed is 3m/min, the equivalent strain amount of each pass is 1% -10%, and the total equivalent strain amount is 20% -150%; The magnesium alloy rotary forging process parameters are that the deformation temperature is 150-300 ℃, the main shaft rotating speed is 80-205 rpm, the feeding speed is 3m/min, the equivalent strain amount of each pass is 1% -10%, and the total equivalent strain amount is 20% -150%.
  2. 2. The method according to claim 1, wherein the stranding process in the step (2) has a deformation temperature of 25-300 ℃, a rotation speed of 3-10 rpm and a feeding speed of 6m/min.
  3. 3. The method according to claim 2, wherein the steel bar and the magnesium alloy bar have the same diameter of 15-25mm.
  4. 4. A method according to claim 3, wherein the swaging in step (1) is performed on a swaging machine provided with heating collar means by which the heating of the bars to be swaged at different temperatures is achieved.
  5. 5. A high-strength high-toughness lightweight heterogeneous composite cable prepared by the method of any one of claims 1-4.
  6. 6. The composite cable of claim 5, wherein the steel bar is 304 stainless steel or 316L stainless steel.
  7. 7. The composite cable of claim 6, wherein the magnesium alloy rod is made of AZ80 magnesium alloy, mg-Li alloy or AZ31 magnesium alloy.

Description

High-strength high-toughness lightweight heterogeneous composite cable and preparation method thereof Technical Field The invention belongs to the field of material preparation, and particularly relates to a high-strength high-toughness lightweight heterogeneous composite cable and a preparation method thereof. Background In the present age, the problem of resource shortage is increasingly serious, which restricts the high-speed development of human society, on the other hand, along with the progress of technology, the traditional metal materials can not meet the requirements of human society, and the development of lightweight metal materials with high performance is urgent. The heterogeneous metal material is proposed relative to the traditional homogeneous material, and is mainly characterized by the material space structure and the non-uniform distribution of components, and has excellent mechanical property combination due to the unique structural characteristics, so that the new development of the traditional metal material is promoted. DAVID HERN a ndez-Escobar et al, in MATERIALS SCIENCE & ENGINEERING A, materials science and engineering A [ J ],2020,771:138578, published "Effect of post-deformation annealing on the microstructure and micro-mechanical behavior of Zn–Mg hybrids processed by High-Pressure Torsion"( deformation post-annealing effects on microstructure and micromechanics of high-pressure torsion Zn-Mg composite alloys) A process for preparing an isomerism zinc-magnesium composite material by high-pressure torsion is described, and microstructure and mechanical properties of the material are regulated and controlled by high-pressure torsion deformation and heat treatment. The technology has the characteristics that (1) the heterogeneous material obtained through high-pressure torsion has good interface bonding property, and can realize good interface metallurgical bonding, and (2) the microstructure of the material is regulated and controlled through heat treatment after deformation, so that the mechanical property of the material is obviously improved. However, the technology also has the following problems that (1) the method is difficult to prepare large-size heterogeneous materials and cannot meet the requirement of industrial popularization due to the limitations of equipment and processing technology, and (2) the method has higher requirements on the thickness and the surface cleanliness of the materials, increases the processing cost and the difficulty, and greatly reduces the production efficiency. Tan Chaolin et al, "MATERIALS RESEARCH LETTERS", 2021,9:291-299, "Additive manufacturing of multi-scale heterostructured high-STRENGTH STEELS" (additive manufacturing of multi-scale heterogeneous high strength steels) describe a process for preparing layered heterogeneous high strength steels using additive manufacturing. The technology has the characteristics that (1) the prepared layered heterogeneous material realizes atomic-level combination between heterogeneous interfaces and has stable mechanical properties, and (2) the prepared heterogeneous high-strength steel has the characteristic of graded isomerism on the scale of layers, molten pools and crystal grains and shows good strength-ductility combination. However, the technology has the following problems that (1) the technology is complicated in process flow and high in manufacturing cost due to the limitation of equipment and processing technology, and is not suitable for large-scale industrial popularization, and (2) the technology is easy to cause material waste and environmental pollution due to the fact that the raw material is a powder material. Disclosure of Invention The invention aims to provide a preparation method of a high-strength high-toughness lightweight heterogeneous steel-magnesium alloy composite cable. Firstly, sequentially carrying out rotary forging deformation on a steel bar and a magnesium alloy bar to obtain a heterogeneous steel bar and a heterogeneous magnesium alloy bar with multi-grain size, removing greasy dirt and oxidation films on the surfaces of the heterogeneous steel bar and the heterogeneous magnesium alloy bar, taking a plurality of heterogeneous steel bars and heterogeneous magnesium alloy bars with the same length, arranging the heterogeneous steel bars and the heterogeneous magnesium alloy bars according to a rule of alternately distributing the heterogeneous steel bars and the heterogeneous magnesium alloy bars along the circumferential direction, and sending the heterogeneous steel bars and the heterogeneous magnesium alloy bars into a stranding machine for stranding to obtain the high-strength high-toughness lightweight heterogeneous steel-magnesium alloy composite cable. The technical scheme for achieving the purpose of the invention is that the preparation method of the high-strength high-toughness lightweight heterogeneous composite cable comprises the following steps: performing r