CN115418586A - Method for preparing surface gradient high-strength high-conductivity copper material by on-line cryogenic-deformation - Google Patents
Method for preparing surface gradient high-strength high-conductivity copper material by on-line cryogenic-deformation Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 66
- 239000010949 copper Substances 0.000 title claims abstract description 48
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000005096 rolling process Methods 0.000 claims abstract description 64
- 238000011282 treatment Methods 0.000 claims abstract description 56
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims abstract description 20
- 239000002184 metal Substances 0.000 claims abstract description 20
- 229910000881 Cu alloy Inorganic materials 0.000 claims abstract description 19
- 238000005728 strengthening Methods 0.000 claims abstract description 9
- 239000006104 solid solution Substances 0.000 claims description 8
- 230000032683 aging Effects 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 12
- 238000005516 engineering process Methods 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 230000008859 change Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 5
- 230000035882 stress Effects 0.000 description 5
- 230000008021 deposition Effects 0.000 description 4
- 238000001803 electron scattering Methods 0.000 description 3
- 239000002086 nanomaterial Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000000694 effects Effects 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
- 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
- 238000011221 initial treatment Methods 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
- 150000002739 metals Chemical class 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
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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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- 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 surface gradient by on-line deep cooling-deformation, which comprises the steps of firstly selecting copper and copper alloy wires with different wire diameter sizes to be uniformly subjected to strengthening treatment, then carrying out deep cooling treatment for a certain time along with the 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, finishing the rolling of the surface of the bar into a cycle, repeating the deep cooling process before starting the next rolling, controlling the rolling reduction so that the surface deformation of a metal sample after rolling is controlled to be 1-15%, and carrying out surface circular rolling for multiple times when each cycle is carried out on the surface of the bar along the direction of a bar core to generate deformation with a certain degree so as to obtain the copper and copper alloy bars with surface gradient with different degrees. The method of the invention ensures that the grain refinement degree of the bar surface is high and is gradually reduced along the core part direction, thereby obtaining the high-strength high-conductivity copper material with gradient surface.
Description
Technical Field
The invention relates to the technical field of metal composite material preparation, in particular to a method for preparing a surface gradient high-strength high-conductivity copper material by on-line cryogenic-deformation.
Background
The mechanical property of the material under cryogenic treatment is greatly different from that under room temperature environment. Materials such as pipeline steel and rubber change from a tough material to a brittle material under cryogenic conditions, and the material fractures brittle when the applied stress exceeds the yield stress of the material. However, for other metallic materials, such as copper alloys, aluminum alloys, titanium alloys, and certain special steel materials, they have higher strength and more excellent toughness than room temperature in a cryogenic environment. The cryogenic treatment can improve the strength and toughness of the material, improve the fatigue resistance of the material, eliminate the internal stress of the material, improve the stability of the material and obtain the material with a more compact molecular structure. Copper alloys have excellent conductivity and low manufacturing cost, but copper materials have low hardness and strength. On the basis, the cryogenic process can effectively improve the performance of the copper and the copper alloy thereof.
The prior art for enhancing the surface performance of metal generally comprises surface nanocrystallization treatment, surface deposition and the like. In the surface deposition technology, an obvious interface is formed between a deposition layer and a substrate in the actual operation process, the bonding force of the interface is low, and the deposition layer is easy to fall off. And the surface nanocrystallization can obtain a unique gradient nanostructure.
The invention combines the deep cooling process, obtains the material with the nano surface by the surface rolling treatment, and the unique gradient structure is organized on the surface of the material, so that the structure performance is mutated, but the structures with different characteristic sizes are coordinated, and simultaneously, a plurality of 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 surface gradient high-strength high-conductivity copper material by on-line cryogenic cooling-deformation.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for preparing a high-strength high-conductivity copper material with a surface gradient through on-line deep cooling and 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 circulating rolling so as to enable the surface tissue structure of the bar to be arranged in a gradient manner from the center to the outside to prepare the high-strength high-conductivity copper material with the surface gradient.
Further, the method specifically comprises the following steps:
(1) Selecting a copper or copper alloy bar, carrying out strengthening treatment on the bar, and carrying out cryogenic treatment on the bar 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 by a cycle, and the bar is subjected to subzero treatment again before the next cycle;
(4) And (3) controlling the surface deformation of the bar sample to be 1-15% through multiple surface circulating rolling, and finally obtaining the high-strength and high-conductivity copper material with a surface gradient, wherein the grain refinement degree of the bar gradually increases outwards along the bar core.
Further, the diameter size (section diameter) of the wire of the bar selected in the step (1) is 10-50 mm.
Furthermore, 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 strengthening treatment mode of the bar in the step (1) is determined according to different materials, and specifically is one or more of heat treatment, solid solution and aging; 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 material in the step (1) is a copper alloy, the solution treatment mode is as follows: the copper alloy is heated to the phase transition temperature, the temperature is kept for 20-60 min, and the copper alloy is cooled at a speed higher than the speed of the second phase separated out from the matrix, so that a 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 cryogenic treatment in the steps (1) and (3) is-195 to-145 ℃, and the cryogenic treatment time of the bar is 1 to 5min.
Further, the method for preparing the surface gradient high-strength high-conductivity copper material by the on-line deep cooling-deformation according to the claim 1, wherein the rolling tool bit in the step (2) is a WC/Co ball with the diameter of 8 mm.
Further, the surface rolling device adopted in the surface rolling in the steps (2), (3) and (4) has the main rolling shaft rotating speed of 500-600 r/min, the feeding rate of 0.5-1 mm/s, the hydraulic pressure starting at 0.2-0.3 MPa, the hydraulic pressure of each circulation pass is improved by 0.2-0.4 MPa, the surface deformation of each circulation pass is controlled to be 1-3%, and the final deformation of the bar is determined through the accumulated deformation of the circulation passes.
Further, the surface rolling and the cryogenic treatment in the steps (2), (3) and (4) are carried out on line, and an adjustable temperature box is adopted as a cryogenic treatment device.
The principle of the invention is as follows:
the grain size of the crystal grains of the copper or copper alloy bar subjected to heat treatment in the initial process is obviously changed, so that the tissues of all parts are relatively uniform, and the internal residual stress is eliminated; then in the process of deep cooling rolling, high dislocation density is formed on the surface of the material, and the high-density dislocations are evolved into grain boundaries to realize grain refinement of the material.
In the rolling process, the grain refinement principle of the surface structure of the bar can be expressed by a Hall-Petch formula: sigma s ＝σ 0+ k d -1/2 Where σ is s Is the flow stress; sigma 0 Is the lattice friction; d is the average grain size in the polycrystalline material; k is a coefficient associated with grain boundaries. Therefore, the more grains per unit volume of the metal polycrystalline material, and the lower the degree of grain refinement, the higher the strength of the material.
The principle of the change in resistivity of copper materials can be expressed by the massen law: 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 due to temperature change. From the formula, it can be seen that the total resistance of the alloy is mainly influenced by ρ (T) at higher temperatures, and by the residual resistance due to electron scattering at lower temperatures. When the residual resistance caused by electron scattering is a fixed value, the higher the temperature is, the greater the resistance of the alloy is, and the linear relationship is formed with the resistance of the pure metal. In addition, the conductivity of metals is also affected by pressure, but in general use the pressure required to change the conductivity is often not achieved. In order to ensure that the resistance is reduced due to the change of temperature, the conductivity of the copper material is measured in a room temperature environment.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention combines Surface Mechanical Rolling Treatment (SMRT) with deep cooling, and induces the generation and migration of crystal grain dislocation by generating a severe plastic deformation layer on the metal surface while improving the hardness and strength of a copper material to form a surface gradient nano structure. The method ensures that the grain refinement degree of the surface of the bar is high, and the grain refinement degree of the middle part along the center direction is low, thereby obtaining the high-strength high-conductivity copper material with gradient surface.
(2) The invention strengthens the defect of low strength of the copper material by a cryogenic process, and forms a surface gradient nano structure by combining surface mechanical rolling treatment, thereby further improving 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 flow chart of the operation of the present invention;
FIG. 2 is a schematic view of the structure of a surface rolling and cryogenic treatment device in an embodiment of the present invention;
fig. 3 is a microstructure view of an original copper material in example 3 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The materials selected in the embodiment of the invention are copper alloys such as pure copper, cuMg alloy, cuCrZr and the like, but are not limited to only use the materials. The invention provides a method for preparing a surface gradient high-strength high-conductivity copper material by on-line deep cooling-deformation, wherein the formed copper material is outward along a rod core, the grain refinement degree is higher and higher, the flow is shown as figure 1, and the method specifically comprises the following steps:
(1) Selecting a copper or copper alloy bar, carrying out strengthening treatment on the bar, and carrying out cryogenic treatment on the bar 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 subzero treatment again before the next cycle;
(4) And (3) performing surface circulating rolling for multiple times, controlling the surface deformation of the bar sample to be 1-15%, and finally obtaining the high-strength and high-conductivity copper material with a surface gradient, wherein the grain refinement degree of the bar is gradually increased along the bar core outwards.
The surface rolling and cryogenic treatment device is shown in figure 2, a rolling cutter head is a WC/Co ball with the diameter of 8mm, a rolling main shaft and the feeding rate are the keys for continuously deforming the surface of a bar, and the speed V of the rolling main shaft applied by the method 1 At 500-600 r/min, the feeding speed V 2 The hydraulic pressure is increased by 0.2-0.4 MPa in each circulation pass at 0.5-1 mm/s and the surface deformation of each circulation pass is controlled to be 1-3%. But not limited to this range, following rollingThe pressure intensity of the cutter head and the speed in the operation can be adjusted correspondingly, so that the optimal effect is obtained.
The following are preferred embodiments of the present invention.
Example 1
A method for preparing a surface gradient high-strength high-conductivity copper material by on-line cryogenic cooling-deformation specifically comprises the following steps:
1) The material selected in this example is a CuMg alloy bar, the wire diameter is 40mm, the main alloying element component is 0.2wt.% Mg, and the balance is Cu. Firstly, the strengthening treatment process of the metal sample is solid solution treatment, the temperature is set at 300 ℃, and the air cooling is carried out after the heat preservation time is 60 min;
fixing the annealed metal bar in a deep cooling-rolling device workbench, performing deep cooling treatment on the bar, regulating and controlling the temperature at-190 ℃, performing deep cooling for 5min, and immediately turning on a rolling shaft switch;
2) The metal sample subjected to cryogenic 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 adjusted 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 degree under the action of the cutter head, the rolling is finished once, the cycle is one cycle, in order to obtain the final deformation effect, the metal sample needs to be subjected to multi-pass cyclic rolling, and the sample is subjected to 8-pass cyclic rolling;
in the clearance of each pass of circular rolling, performing cryogenic treatment on the metal bar again, wherein the cryogenic treatment temperature is-190 ℃, the time is consistent with the initial treatment time, and the time is 5min;
4) And finishing the rolling treatment of 8 circulation passes, and finally obtaining the high-strength and high-conductivity copper material with gradient surface, wherein the deformation of the metal bar is 12%.
Example 2
A method for preparing a surface gradient high-strength high-conductivity copper material by on-line cryogenic cooling-deformation specifically comprises the following steps:
the material selected in this example is a CuCrZr alloy rod, the wire diameter size is 50mm, the main alloying elements are 0.36wt.% Cr, 0.40wt.% Zr, and the balance is Cu. Firstly, the strengthening treatment process of the metal sample comprises the following steps of solid solution and aging: the solution treatment is carried out for 60min at 960 ℃, 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-cool;
fixing the annealed metal bar in a deep cooling-rolling device workbench, and performing deep cooling treatment on the bar at the temperature of-165 ℃ for 3min;
different from the embodiment 1, the pass of the rolling circulation of the embodiment 2 is 10 times, the temperature of the deep cooling treatment of the rolling clearance is-190 ℃, the time is 1min, and the final deformation amount is 14 percent;
the process of the alloy bar in the surface rolling treatment is the same as that of example 1, and the rolling step is repeated.
Example 3
A method for preparing a surface gradient high-strength high-conductivity copper material by on-line cryogenic cooling-deformation specifically comprises the following steps:
the material selected in this example is a pure Cu bar, the microstructure is shown in fig. 3, the wire diameter is 30mm, and a metal sample is first subjected to heat treatment at 300 ℃ for 30min;
fixing the annealed metal bar in a deep cooling-rolling device workbench, regulating and controlling the deep cooling treatment temperature of the bar at-190 ℃ and the deep cooling time for 2min;
different from the embodiment 1, the pass of the rolling circulation of the embodiment 3 is 6 times, the temperature of the deep cooling treatment of the rolling clearance is-160 ℃, the time is 1min, and the final deformation amount is 10 percent;
the process of the alloy bar in the surface rolling treatment is the same as that of example 1, and the rolling step is repeated.
Table 1 conductivity performance parameters of the raw copper material and after deep cooling-deformation treatment in each example
The technical solutions above illustrate the technical idea of the present invention, and the scope of the present invention should not be limited thereby, and any changes and modifications made to the above technical solutions according to the technical essence of the present invention are all within the scope of the technical solutions of the present invention.
Claims (8)
1. A method for preparing a surface gradient high-strength high-conductivity copper material through on-line copious cooling-deformation is characterized in that a metal bar is subjected to on-line copious cooling in an ultralow temperature environment, and then surface rolling treatment is carried out, and the deformation of the surface of the metal bar is controlled according to the number of times of circular rolling, so that the surface tissue of the bar is in a gradient arrangement structure from the center to the outside, and the surface gradient high-strength high-conductivity copper material is prepared.
2. The method for preparing the surface-gradient high-strength and high-conductivity copper material through on-line cryogenic-deformation according to claim 1, wherein the method specifically comprises the following steps:
(1) Selecting a copper or copper alloy bar, carrying out strengthening treatment on the bar, and carrying out cryogenic treatment on the bar 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 by a cycle, and the bar is subjected to subzero treatment again before the next cycle;
(4) And (3) controlling the surface deformation of the bar sample to be 1-15% through multiple surface circulating rolling, and finally obtaining the high-strength and high-conductivity copper material with a surface gradient, wherein the grain refinement degree of the bar gradually increases outwards along the bar core.
3. The method for preparing the high-strength and high-conductivity copper material with the surface gradient by the on-line cryogenic-deformation according to claim 1, wherein the wire diameter of the bar material selected in the step (1) is 10-50 mm.
4. The method for preparing the surface-gradient high-strength and high-conductivity copper material through the on-line cryogenic-deformation according to claim 1, wherein the strengthening treatment mode of the bars in the step (1) is determined according to different materials, and specifically is one or more of heat treatment, solid solution and aging; 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.
5. The method for preparing the copper material with high strength and high conductivity and surface gradient by the on-line cryogenic-deformation according to claim 4, wherein in the step (1), if the bar is a copper alloy, the solution treatment mode is as follows: the copper alloy is heated to the phase transition temperature, the temperature is kept for 20-60 min, and the copper alloy is cooled at a speed higher than the speed of the second phase separated from the matrix, so that a supersaturated solid solution is obtained, and the performance of the copper alloy is improved.
6. The method for preparing the copper material with high strength and high conductivity and surface gradient by the online deep cooling-deformation according to the claim 1, characterized in that the temperature of the bar deep cooling treatment in the steps (1) and (3) is-195 to-145 ℃, and the time of the deep cooling treatment of the bar is 1 to 5min.
7. The method for preparing high-strength and high-conductivity copper materials with surface gradient by on-line cryogenic-deformation according to claim 1, characterized in that the surface rolling in the steps (2), (3) and (4) adopts a surface rolling device with a rolling main shaft rotating speed of 500-600 r/min, a feeding speed of 0.5-1 mm/s, a hydraulic pressure starting of 0.2-0.3 MPa, a hydraulic pressure increase of 0.2-0.4 MPa in each cycle pass, the surface deformation amount of each cycle pass is controlled to be 1-3%, and the final deformation amount of the bar is determined through the accumulated deformation of the cycle passes.
8. The method for preparing the high-strength and high-conductivity copper material with the surface gradient by the on-line cryogenic-deformation according to the claim 1, characterized in that the surface rolling and the cryogenic treatment in the steps (2), (3) and (4) are carried out on line, and an adjustable temperature box is adopted in a cryogenic 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 |
|---|
| 庄辉等: "表面机械滚压处理T2紫铜的载流摩擦学行为", 《中国有色金属报》 * |
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