CN115418586B - Method for preparing high-strength high-conductivity copper material with surface gradient through on-line deep cooling-deformation - Google Patents
Method for preparing high-strength high-conductivity copper material with surface gradient through on-line deep cooling-deformation Download PDFInfo
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- CN115418586B CN115418586B CN202211205561.6A CN202211205561A CN115418586B CN 115418586 B CN115418586 B CN 115418586B CN 202211205561 A CN202211205561 A CN 202211205561A CN 115418586 B CN115418586 B CN 115418586B
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- 239000000463 material Substances 0.000 title claims abstract description 64
- 239000010949 copper Substances 0.000 title claims abstract description 42
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000005096 rolling process Methods 0.000 claims abstract description 63
- 238000011282 treatment Methods 0.000 claims abstract description 52
- 229910052751 metal Inorganic materials 0.000 claims abstract description 19
- 239000002184 metal Substances 0.000 claims abstract description 19
- 229910000881 Cu alloy Inorganic materials 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 10
- 238000005728 strengthening Methods 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims description 16
- 230000032683 aging Effects 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- 238000010791 quenching Methods 0.000 claims description 2
- 230000000171 quenching effect Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 3
- 229910045601 alloy Inorganic materials 0.000 description 11
- 239000000956 alloy Substances 0.000 description 11
- 230000008859 change Effects 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 239000006104 solid solution Substances 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 230000008021 deposition Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000002086 nanomaterial Substances 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000001803 electron scattering Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000007709 nanocrystallization Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 241000269821 Scombridae Species 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000011221 initial treatment Methods 0.000 description 1
- 235000020640 mackerel Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0016—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
- H01B1/026—Alloys based on copper
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a method for preparing a high-strength high-conductivity copper material with a surface gradient through on-line cryogenic deformation, which comprises the steps of firstly selecting copper and copper alloy wires with different wire diameter sizes to uniformly carry out strengthening treatment, then carrying out cryogenic treatment for a certain time along with rotation of a rolling shaft in an ultralow temperature environment, then rolling the surface of a bar by adopting a Surface Mechanical Rolling Treatment (SMRT) technology, wherein the rolling of the surface of the bar is finished into a cycle, the cryogenic process needs to be repeated before the next rolling, the surface deformation of a rolled metal sample is controlled to be 1-15% by controlling the rolling reduction, and each cycle of the surface of the bar along the direction of a bar core can generate certain deformation, and the surface of the bar is circularly rolled for a plurality of times, so that copper and copper alloy bars with different surface gradients can be obtained. The method of the invention ensures that the grain refinement degree of the bar surface is high, and the grain refinement degree is gradually reduced along the core direction, thereby obtaining the high-strength high-conductivity copper material with surface gradient.
Description
Technical Field
The invention relates to the technical field of metal composite material preparation, in particular to a method for preparing a high-strength high-conductivity copper material with a surface gradient through on-line deep cooling-deformation.
Background
The mechanical properties of the material under the deep cooling treatment are very different from those of the material under the room temperature environment. Materials such as pipeline steel and rubber can be changed into brittle materials from ductile materials under the condition of deep cooling, and the materials can be broken in a brittle manner when the external stress exceeds the yield stress of the materials. However, for other metallic materials, such as copper alloys, aluminum alloys, titanium alloys, and certain special steel materials, they have higher strength and superior toughness than room temperature in a cryogenic environment. The cryogenic treatment can improve the strength and toughness of the material and the fatigue resistance of the material, and in addition, the cryogenic treatment can eliminate the internal stress of the material and improve the stability of the material, so that the material with a tighter molecular structure can be obtained. Copper alloys have excellent electrical conductivity and lower manufacturing costs, but copper materials have lower hardness and strength. On the basis, the cryogenic technology can effectively improve the performance of copper and copper alloy thereof.
Current techniques for enhancing the surface properties of metals generally include surface nanocrystallization, surface deposition, and the like. The surface deposition technology has obvious interface between the deposition layer and the matrix in the actual operation process, and the interface binding force is lower, so that the deposition layer is easy to fall off. And surface nanocrystallization can obtain a unique gradient nanostructure.
According to the invention, by combining a cryogenic process, the surface nano material is obtained through surface rolling treatment, and the surface of the material is organized into a unique gradient structure, so that the property of the organization structure is suddenly changed, but the structures with different characteristic sizes are mutually coordinated, and meanwhile, various action mechanisms corresponding to the characteristic sizes are shown, and the toughness and the conductivity of the material are obviously improved.
Disclosure of Invention
The invention aims to provide a method for preparing a high-strength high-conductivity copper material with a surface gradient through on-line deep cooling-deformation.
The technical scheme adopted for solving the technical problems is as follows: a method for preparing high-strength high-conductivity copper material with surface gradient by on-line deep cooling-deformation comprises the steps of carrying out on-line deep cooling on a metal bar in an ultralow temperature environment, carrying out surface rolling treatment (SMRT), and controlling the deformation of the surface of the metal bar according to the number of times of cyclic rolling to enable the surface structure of the bar to be distributed in a gradient way from the center to the outside, so as to prepare the high-strength high-conductivity copper material with surface gradient.
Further, the method specifically comprises the following steps:
(1) Selecting copper or copper alloy bars, carrying out strengthening treatment on the bars, and carrying out cryogenic treatment on the bars after the treatment is finished;
(2) Rolling the surface of the bar subjected to deep cooling, and deforming the bar by utilizing the downward pressing of a rolling cutter head;
(3) The surface rolling is finished into a cycle, and the bar is subjected to cryogenic treatment again before the next cycle;
(4) And (3) carrying out surface circulation rolling for multiple times, controlling the surface deformation of the bar sample to be 1-15%, and finally obtaining the high-strength high-conductivity copper material with surface gradient, wherein the bar is outwards along the bar core, and the grain refinement degree is gradually increased.
Further, the wire diameter size (section diameter) of the bar material selected in the step (1) is 10-50 mm.
Further, the tensile strength of the copper or copper alloy bar in the step (1) is 210-320 MPa, and the Vickers hardness is 55-75 HV.
Further, the reinforcement treatment mode of the bar in the step (1) is determined according to different materials, and specifically, one or more of heat treatment, solid solution and aging are performed; wherein the heat treatment temperature is 300-600 ℃, the solid solution temperature and the aging temperature are 300-1000 ℃, and the time is 0.2-6 h.
Further, if the bar in the step (1) is a copper alloy, the solution treatment mode is as follows: the copper alloy is heated to a temperature above the phase transition temperature, kept at the temperature for 20-60 min, cooled at a speed faster than that of the second phase separated from the matrix, so that supersaturated solid solution is obtained, and the performance of the copper alloy is improved.
Further, the strengthening treatment in the step (1) is performed in a vacuum quartz tube.
Further, the temperature of the bar material in the step (1) and the step (3) is between minus 195 ℃ and minus 145 ℃, and the time of the bar material in the step (1) and the step (3) is between 1min and 5min.
Further, the method for preparing the high-strength and high-conductivity copper material with the surface gradient through on-line deep cooling-deformation according to claim 1, wherein the rolling tool bit in the step (2) is a WC/Co ball with the diameter of 8 mm.
Further, the rotation speed of a surface rolling main shaft of a surface rolling device adopted in surface rolling in the steps (2), (3) and (4) is 500-600 r/min, the feeding rate is 0.5-1 mm/s, the hydraulic pressure is started at 0.2-0.3 MPa, the hydraulic pressure of each circulating pass is increased by 0.2-0.4 MPa, the surface deformation of each circulating pass is controlled to be 1-3%, the accumulated deformation of the passing circulating passes is controlled, and the final deformation of the bar is determined.
Further, surface rolling and cryogenic treatment in the steps (2), (3) and (4) are carried out on line, and an adjustable temperature box is adopted in the cryogenic treatment device.
The principle of the invention is as follows:
the grain size of the copper or copper alloy bar after heat treatment in the initial process is obviously changed, so that the structure of each part is relatively uniform, and the internal residual stress is eliminated; and then in the deep-cooling rolling process, high dislocation density is formed on the surface of the material, and the dislocation with high density is evolved into a crystal boundary, so that the grain refinement of the material is realized.
In the rolling process, the grain refinement principle of the surface structure of the bar can be expressed by a Hall-Petch formula: sigma (sigma) s ＝σ 0+ k d -1/2 Wherein sigma s Is the rheological stress; sigma (sigma) 0 Is lattice friction; d is the average grain size in the polycrystalline material; k is a coefficient related to grain boundaries. Thus, the more grains and the lower the degree of grain refinement within a unit volume of the metallic polycrystalline material, the higher the strength of the material.
The principle of resistivity change of copper material can be expressed by the law of mackerel: ρ=ρ' +ρ (T), where: ρ is the total resistance of the alloy; ρ' is the residual resistance caused by electron scattering; ρ (T) is the resistance caused by the temperature change. As can be seen from the formula, the total resistance of the alloy is mainly affected by ρ (T) when the temperature is high, and by the residual resistance due to electron scattering when the temperature is low. When the residual resistance caused by electron scattering is a fixed value, the higher the temperature, the greater the resistance of the alloy, which is in a linear relationship with the resistance of the pure metal. In addition, the conductivity of metals is also affected by pressure, but in general use conditions, the pressure required to change conductivity is often not reached. In order to ensure that the temperature change has an effect on the resistance, the conductivity of the copper material is measured in the room temperature environment in the invention.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the invention, surface gradient nano-structure is formed by inducing generation and migration of crystal grain dislocation through generating a severe plastic deformation layer on the surface of a metal while improving the hardness and strength of a copper material according to combination of Surface Mechanical Rolling Treatment (SMRT) and cryogenic cooling. The method ensures that the grain refinement degree of the surface of the bar is high, and the grain refinement degree in the middle along the core direction is low, so that the high-strength and high-conductivity copper material with the surface gradient is obtained.
(2) The invention strengthens the defect of lower strength of the copper material by a cryogenic process, combines surface mechanical rolling treatment, forms a surface gradient nano structure and further improves the conductivity of the copper material. The two processes are organically combined, and various parameters are regulated and controlled, so that the performance of the treated material is obviously improved.
Drawings
FIG. 1 is a schematic illustration of the operational flow of the present invention;
FIG. 2 is a schematic view of a surface rolling and cryogenic treatment device in accordance with an embodiment of the present invention;
fig. 3 is a microstructure of the original copper material in example 3 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The materials selected in the embodiment of the invention are pure copper, cuMg alloy, cuCrZr alloy and other copper alloys, but are not limited to the materials. The invention provides a method for preparing a high-strength high-conductivity copper material with a surface gradient through on-line cryogenic-deformation, which is characterized in that the copper material is outwards formed along a rod core, the grain refinement degree is higher and higher, the flow is shown in a figure 1, and the method specifically comprises the following steps:
(1) Selecting copper or copper alloy bars, carrying out strengthening treatment on the bars, and carrying out cryogenic treatment on the bars after the treatment is finished;
(2) Rolling the surface of the bar subjected to deep cooling, and deforming the bar by utilizing the downward pressing of a rolling cutter head;
(3) The surface rolling is finished into a cycle, and the bar is subjected to cryogenic treatment again before the next cycle;
(4) And (3) carrying out surface circulation rolling for multiple times, controlling the surface deformation of the bar sample to be 1-15%, and finally obtaining the high-strength high-conductivity copper material with surface gradient, wherein the bar is outwards along the bar core, and the grain refinement degree is gradually increased.
As shown in figure 2, the surface rolling and cryogenic treatment device is characterized in that the rolling tool bit is a WC/Co ball with the diameter of 8mm, the rolling main shaft and the feeding rate are key for continuously deforming the surface of the bar, and the rolling main shaft rate V applied by the method 1 At a feed rate V of 500-600 r/min 2 The hydraulic pressure is started at 0.2-0.3 MPa at 0.5-1 mm/s, the hydraulic pressure of each circulation pass is increased by 0.2-0.4 MPa, and the surface deformation of each circulation pass is controlled at 1-3%. But not limited to this range, the speed in the operation of the rolling cutter head can be correspondingly adjusted along with the change of the pressure of the rolling cutter head, so that the optimal effect is obtained.
The following are preferred embodiments of the present invention.
Example 1
The method for preparing the high-strength high-conductivity copper material with the surface gradient by on-line deep cooling-deformation specifically comprises the following steps:
1) The material selected in this example is CuMg alloy bar, the wire diameter size is 40mm, the main alloy element component is 0.2wt.% Mg, and the rest is Cu. Firstly, the strengthening treatment process of the metal sample is solution treatment, the temperature is set at 300 ℃, and air cooling is carried out after the heat preservation time is 60 min;
fixing the annealed metal bar in a workbench of a cryogenic-rolling device, performing cryogenic treatment on the bar, regulating and controlling the temperature to be-190 ℃, and performing cryogenic treatment for 5min, and immediately turning on a rolling shaft switch;
2) The metal sample subjected to the deep cooling treatment enters a rolling link, the distance between a rolling cutter head and the sample is set in advance, the initial pressure of a hydraulic device is regulated to be 0.25MPa, the actual working speed of a rolling main shaft is set to be 500r/min, and the feeding speed is set to be 0.5mm/s;
3) The surface of the sample subjected to surface rolling treatment is deformed to a certain extent under the action of the cutter head, rolling is finished once, and the sample is circulated for one cycle, so that the metal sample is subjected to multi-pass circulating rolling for obtaining the final deformation effect, and the sample is subjected to 8-pass circulating rolling;
the metal bar is subjected to cryogenic treatment again in the gaps which are circularly rolled in each pass, wherein the cryogenic treatment temperature is-190 ℃, the time is consistent with the initial treatment time, and the time is 5min;
4) And (3) finishing the rolling treatment of 8 times circularly, wherein the deformation of the final metal bar is 12%, and the high-strength high-conductivity copper material with the surface gradient is manufactured.
Example 2
The method for preparing the high-strength high-conductivity copper material with the surface gradient by on-line deep cooling-deformation specifically comprises the following steps:
the material selected in this example is CuCrZr alloy bar, the wire diameter size is 50mm, the main alloy element components are 0.36wt.% Cr, 0.40wt.% Zr, and the rest is Cu. Firstly, the strengthening treatment process of the metal sample comprises solid solution and aging: the solid solution process is carried out at 960 ℃ for 60min, and then water quenching is carried out; then carrying out aging treatment, wherein the aging process is to keep the temperature at 550 ℃ for 60min, and air cooling;
fixing the annealed metal bar in a workbench of a cryogenic-rolling device, wherein the bar is subjected to cryogenic treatment, the temperature is regulated and controlled at-165 ℃, and the cryogenic time is 3min;
unlike example 1, the pass of the rolling cycle of example 2 was 10 times, the rolling gap sub-zero treatment temperature was-190 ℃, the time was 1min, and the final deformation was 14%;
the surface rolling treatment of the alloy bar was performed in the same manner as in example 1, and the rolling step was repeated.
Example 3
The method for preparing the high-strength high-conductivity copper material with the surface gradient by on-line deep cooling-deformation specifically comprises the following steps:
the material selected in the embodiment is a pure Cu bar, the microstructure is shown in figure 3, the wire diameter size is 30mm, firstly, the metal sample is subjected to heat treatment at 300 ℃ for 30min;
fixing the annealed metal bar in a workbench of a cryogenic-rolling device, wherein the cryogenic treatment temperature of the bar is regulated and controlled to be-190 ℃, and the cryogenic time is 2min;
unlike example 1, the pass of the rolling cycle of example 3 was 6 times, the rolling gap sub-zero treatment temperature was-160 ℃, the time was 1min, and the final deformation was 10%;
the surface rolling treatment of the alloy bar was performed in the same manner as in example 1, and the rolling step was repeated.
TABLE 1 conductivity performance parameters of the original copper materials and after the deep-cold-deformation treatment of the examples
The technical scheme of the invention is explained in the technical scheme, the protection scope of the invention cannot be limited by the technical scheme, and any changes and modifications to the technical scheme according to the technical substance of the invention belong to the protection scope of the technical scheme of the invention.
Claims (3)
1. A method for preparing a high-strength high-conductivity copper material with a surface gradient by on-line deep cooling-deformation is characterized in that the surface gradient high-strength high-conductivity copper material is prepared by carrying out on-line deep cooling on a metal bar in an ultralow temperature environment, then carrying out surface rolling treatment, and controlling the deformation of the surface of the metal bar according to the number of times of cyclic rolling so as to lead the surface structure of the bar to be in a gradient arrangement structure from the center to the outside; the method specifically comprises the following steps:
(1) Selecting a copper alloy bar, carrying out strengthening treatment on the bar, and carrying out cryogenic treatment on the bar after the treatment is finished;
the strengthening treatment is one of the following processes:
A. air cooling after heat preservation for 60min at 300 ℃;
B. preserving the temperature at 960 ℃ for 60min, and then quenching with water; then aging treatment is carried out, the aging process is that the temperature is kept for 60min at 550 ℃, and air cooling is carried out;
(2) Rolling the surface of the bar subjected to deep cooling, and deforming the bar by utilizing the downward pressing of a rolling cutter head;
(3) The surface rolling is finished into a cycle, and the bar is subjected to cryogenic treatment again before the next cycle;
(4) The surface deformation of the bar sample is controlled to be 1-15% after multiple surface circulation rolling, and finally the high-strength high-conductivity copper material with surface gradient is obtained, wherein the bar is outwards along the bar core, and the grain refinement degree is gradually increased;
the temperature of the bar material in the step (1) and the step (3) is minus 195 to minus 145 ℃, and the time of the bar material in the step (1) to 5min;
the rotation speed of a rolling main shaft of a surface rolling device adopted in the rolling in the steps (2), (3) and (4) is 500-600 r/min, the feeding rate is 0.5-1 mm/s, the hydraulic pressure is started at 0.2-0.3 MPa, the hydraulic pressure of each circulation pass is increased by 0.2-0.4 MPa, and the surface deformation of each circulation pass is controlled to be 1-3%.
2. The method for preparing the high-strength and high-conductivity copper material with the surface gradient through on-line deep cooling-deformation according to claim 1, wherein the wire diameter size of the bar material selected in the step (1) is 10-50 mm.
3. The method for preparing the high-strength and high-conductivity copper material with the surface gradient by on-line deep cooling-deformation according to claim 1, wherein surface rolling and deep cooling treatment in the steps (2), (3) and (4) are performed on line, and an adjustable temperature box is adopted by a deep cooling treatment device.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1468710A (en) * | 1975-04-30 | 1977-03-30 | Atomic Energy Authority Uk | Methods of forming re-entrant cavities in the surface of heat exchange members or ebulators |
| CN104152651A (en) * | 2014-08-28 | 2014-11-19 | 武汉大学 | Method for preparing gradient nanometer layer on surface of metal material by using rolling deformation |
| CN114406600A (en) * | 2021-11-26 | 2022-04-29 | 中国科学院金属研究所 | Method for preparing metal plate with gradient nano structure |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1468710A (en) * | 1975-04-30 | 1977-03-30 | Atomic Energy Authority Uk | Methods of forming re-entrant cavities in the surface of heat exchange members or ebulators |
| CN104152651A (en) * | 2014-08-28 | 2014-11-19 | 武汉大学 | Method for preparing gradient nanometer layer on surface of metal material by using rolling deformation |
| CN114406600A (en) * | 2021-11-26 | 2022-04-29 | 中国科学院金属研究所 | Method for preparing metal plate with gradient nano structure |
Non-Patent Citations (1)
| Title |
|---|
| 表面机械滚压处理T2紫铜的载流摩擦学行为;庄辉等;《中国有色金属报》;第1-14页 * |
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