CN113234959A - Multi-element composite microalloyed high-strength high-conductivity copper alloy material and preparation method thereof - Google Patents
Multi-element composite microalloyed high-strength high-conductivity copper alloy material and preparation method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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Abstract
The invention discloses a multi-element composite microalloyed high-strength high-conductivity copper alloy material and a preparation method thereof. The copper alloy material comprises the following components: 0.4-1.0% of Ni, 0.3-1.0% of Co, 0.1-0.4% of Si, 0.1-0.3% of Cr, 0.1-0.3% of Sn, 0.05-0.15% of Zn, 0.01-0.05% of rare earth elements and the balance of Cu, wherein the rare earth elements are Nb, La or Ce and the like. The copper alloy material comprehensively considers precipitation strengthening, strain strengthening and fine grain strengthening, adds low-content alloy elements for composite micro-alloying, reduces the content of a single intermetallic compound precipitation phase, effectively reduces the solid solution temperature, obviously shortens the solid solution time, can ensure fine and uniform alloy grains while fully solid-dissolving, effectively solves the problem of contradiction between full solid solution and grain growth of the high-strength high-conductivity copper alloy, and synchronously improves the strength and the conductivity of the copper alloy.
Description
Technical Field
The invention relates to a copper alloy material, in particular to a multi-element composite microalloyed high-strength high-conductivity copper alloy material and a preparation method thereof, belonging to the technical field of nonferrous metals.
Background
The high-strength high-conductivity copper alloy has wide application in modern industry, and the precipitation strengthening type high-strength high-conductivity copper alloy, such as CuNiSi, CuCrZr and other series, becomes the high-strength high-conductivity copper alloy material with the best comprehensive performance. In order to further improve the performance, the content of alloy elements is increased, so as to improve the strengthening effect and increase the yield strength. However, in the preparation process of the high-strength and high-conductivity copper alloy, solid solution and aging treatment are required, and increasing the content of alloy elements can increase the number of intermetallic compounds in copper alloy grains, increase the size of the intermetallic compounds, and increase the difficulty of sufficient solid solution; if the solid solution temperature is increased or the solid solution time is prolonged, not only is the cost and the energy consumption increased, but also the copper alloy is completely recrystallized and the crystal grains grow up, the strain strengthening and fine crystal strengthening effects are completely disappeared, and the strength is reduced to a certain extent. Therefore, those skilled in the art desire to improve the precipitation strengthening effect by multi-component alloying, and to improve the alloy structure after solution melting without increasing the content of a single intermetallic compound.
Disclosure of Invention
The invention mainly aims to provide a multi-element composite microalloyed high-strength high-conductivity copper alloy material and a preparation method thereof, so as to overcome the defects in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention comprises the following steps:
the embodiment of the invention provides a multi-element composite microalloyed high-strength high-conductivity copper alloy material, which comprises the following components in percentage by mass: 0.4 to 1.0% of Ni, 0.3 to 1.0% of Co, 0.1 to 0.4% of Si, 0.1 to 0.3% of Cr, 0.1 to 0.3% of Sn, 0.05 to 0.15% of Zn, 0.01 to 0.05% of rare earth elements and the balance of Cu.
In some embodiments, the rare earth elements include any one or a combination of two or more of Nb, La, Ce, and the like.
The embodiment of the invention also provides a preparation method of the multi-element composite microalloyed high-strength high-conductivity copper alloy material, which comprises the following steps:
preparing materials according to the components in the multi-element composite microalloyed high-strength high-conductivity copper alloy material, mixing, and smelting to obtain liquid copper alloy;
and casting the liquid copper alloy into a copper alloy ingot, and then sequentially carrying out annealing treatment, rolling treatment, solid solution treatment and aging treatment to obtain the multi-element composite microalloyed high-strength high-conductivity copper alloy material.
Compared with the prior art, the invention has the beneficial effects that:
the multi-element composite microalloyed high-strength high-conductivity copper alloy material provided by the invention comprehensively considers precipitation strengthening, strain strengthening and fine grain strengthening, and low-content alloy elements are added for composite microalloying, wherein Ni, Co and Si are synergistically precipitated, Cr and Sn are synergistically precipitated, and system elements play a fine grain role. By reducing the content of a single intermetallic compound, the solid solution temperature is effectively reduced, the solid solution time is obviously shortened, the fine and uniform alloy grains can be ensured while the solid solution is fully carried out, a good comprehensive strengthening effect is obtained, the contradiction between the full solid solution and the grain growth of the high-strength and high-conductivity copper alloy is effectively solved, the strength and the conductivity of the copper alloy are synchronously improved, the processing flow is shortened, and the manufacturing difficulty and the manufacturing cost are reduced.
Detailed Description
In view of the above problems in the prior art, the present inventors have long studied and practiced a lot of times to provide a technical solution of the present invention, which may be based on the following principles: the precipitation strengthening, the strain strengthening and the fine grain strengthening are comprehensively considered, the low-content alloy elements are added for composite micro-alloying, the content of a single intermetallic compound is reduced, the solid solution time is obviously shortened, the fine and uniform alloy grains are ensured while the solid solution is fully carried out, and the good comprehensive strengthening effect is obtained.
The technical solution, its implementation and principles, etc. will be further explained as follows.
One aspect of the embodiment of the invention provides a multi-component composite microalloyed high-strength high-conductivity copper alloy material, which comprises the following components in percentage by mass: 0.4 to 1.0% of Ni, 0.3 to 1.0% of Co, 0.1 to 0.4% of Si, 0.1 to 0.3% of Cr, 0.1 to 0.3% of Sn, 0.05 to 0.15% of Zn, 0.01 to 0.05% of rare earth elements and the balance of Cu.
In some embodiments, the rare earth elements include any one or a combination of two or more of Nb, La, Ce, and the like, but are not limited thereto.
In some more specific embodiments, the multi-element composite microalloyed high-strength high-conductivity copper alloy material of the invention comprises the following components in percentage by weight: nb: 0.02%, Ni: 0.6%, Co: 0.5%, Si: 0.3%, Cr: 0.2%, Sn: 0.15%, Zn: 0.1% and the balance of Cu;
or: nb: 0.03%, Ni: 0.5%, Co: 0.4%, Si: 0.25%, Cr: 0.15%, Sn: 0.2%, Zn: 0.15 percent, and the balance of Cu;
or: nb: 0.04%, Ni: 0.4%, Co: 0.5%, Si: 0.3%, Cr: 0.2%, Sn: 0.2%, Zn: 0.1% and the balance of Cu;
or: la: 0.02%, Ni: 0.8%, Co: 0.7%, Si: 0.4%, Cr: 0.2%, Sn: 0.15%, Zn: 0.1% and the balance of Cu;
or: la: 0.03%, Ni: 0.7%, Co: 0.6%, Si: 0.35%, Cr: 0.25%, Sn: 0.25%, Zn: 0.1% and the balance of Cu;
or: ce: 0.04%, Ni: 0.7%, Co: 0.5%, Si: 0.3%, Cr: 0.2%, Sn: 0.25%, Zn: 0.1% and the balance of Cu;
or: ce: 0.03%, Ni: 0.7%, Co: 0.5%, Si: 0.3%, Cr: 0.25%, Sn: 0.25%, Zn: 0.1% and the balance Cu.
In some embodiments, the multi-component microalloyed high-strength high-conductivity copper alloy material has a tensile strength of 690-730 MPa and an electrical conductivity of 55-60% IACS. (see also Table 1).
Another aspect of the embodiments of the present invention provides a method for preparing the aforementioned multi-component microalloyed high-strength high-conductivity copper alloy material, including:
preparing materials according to the components in the multi-element composite microalloyed high-strength high-conductivity copper alloy material, mixing, and smelting to obtain liquid copper alloy;
and casting the liquid copper alloy into a copper alloy ingot, and then sequentially carrying out annealing treatment, rolling treatment, solid solution treatment and aging treatment to obtain the multi-element composite microalloyed high-strength high-conductivity copper alloy material.
In some embodiments, the preparation method specifically comprises: and (3) burdening each component in the multi-component composite microalloyed high-strength high-conductivity copper alloy material, mixing, smelting at 1150-1250 ℃ for 30-60 min, refining, deslagging, standing and degassing to obtain the liquid copper alloy.
In some embodiments, the preparation method specifically comprises: and casting the liquid copper alloy into a copper alloy ingot with a square section and a side length of 100-200 mm at 1100-1150 ℃.
In some embodiments, the preparation method specifically comprises: and (3) placing the copper alloy ingot in an induction coil device, heating to the temperature of 950-1000 ℃, and preserving heat for 30-60 min to carry out annealing treatment.
In some embodiments, the preparation method specifically comprises: hot rolling the copper alloy ingot obtained by annealing treatment at 800-900 ℃ until the thickness is 6-12 mm, then rough rolling until the thickness is 1.5-2 mm, the rough rolling processing amount is 20-30%, and the intermediate annealing temperature is 700-800 ℃; and finally, rolling to the thickness of 0.2-0.6 mm, thereby finishing the rolling treatment.
In some embodiments, the preparation method specifically comprises: and carrying out solution treatment on the copper alloy strip obtained by rolling treatment at 980-1020 ℃ for 20-25 s in total, wherein the retention time in a high-temperature area is 10-15 s.
In some embodiments, the preparation method specifically comprises: and carrying out aging treatment on the copper alloy plate strip obtained through the solution treatment at 480-520 ℃ for 1.5-3 h.
Further, the preparation method further comprises the following steps: and straightening, cutting and packaging the copper alloy plate strip obtained through the aging treatment to obtain a high-strength high-conductivity copper alloy plate strip finished product.
In some more specific embodiments, the preparation method specifically comprises:
selecting high-purity raw materials for proportioning based on the components, mixing, smelting at 1150-1250 ℃ for 30-60 min, refining, deslagging, standing, degassing to obtain a liquid copper alloy, and casting into an ingot with a square cross section and a side length of 100-200 mm at 1100-1150 ℃; and preserving the heat at 950-1000 ℃ for 30-60 min to finish the homogenizing annealing. Hot rolling at 800-900 ℃ until the thickness is 6-12 mm, rough rolling for 3 times until the thickness is 1.5-2 mm, wherein the rough rolling processing amount is 20-30%, and the intermediate annealing temperature is 700-800 ℃; finally, cold rolling to a thickness of 0.2-0.6 mm. Solid solution is carried out in a tunnel furnace, the solid solution temperature is 980-1020 ℃, the total time in the tunnel furnace is 20-25 s, and the high temperature area is 10-15 s; and then preserving heat for 1.5-3 h at 480-520 ℃, and finally straightening, cutting and packaging to obtain the high-strength and high-conductivity copper alloy plate strip finished product.
In some specific preferred embodiments, the preparation method of the multi-component composite microalloyed high-strength high-conductivity copper alloy material mainly comprises the following steps:
(1) smelting: mixing the components, putting the mixture into a smelting furnace, smelting at 1150-1250 ℃ for 30-60 min, refining, deslagging, standing and degassing to obtain liquid copper alloy;
(2) casting: casting the copper alloy melt into an ingot with a square section and a side length of 100-200 mm at 1100-1150 ℃;
(3) homogenizing and annealing: placing the copper alloy ingot into an induction coil device, heating to the temperature of 950-1000 ℃ and keeping the temperature for 30-60 min;
(4) rolling: hot rolling the copper alloy ingot treated in the step (3) at 800-900 ℃ to 6-12 mm thick, rough rolling for 3 times to 1.5-2 mm thick, wherein the rough rolling processing amount is 20-30%, and the intermediate annealing temperature is 700-800 ℃; finally, cold rolling to a thickness of 0.2-0.6 mm;
(5) solid solution: the copper alloy plate strip obtained in the step (4) is used in a tunnel furnace for solid solution, the solid solution temperature is 980-1020 ℃, the total time is 20-25 s in the tunnel furnace, and the high temperature area is 10-15 s;
(6) aging: preserving the heat of the copper alloy plate strip obtained in the step (5) at 480-520 ℃ for 1.5-3 h;
(7) and (3) final treatment: and (4) straightening, cutting and packaging the copper alloy plate strip processed in the step (6) to obtain a high-strength high-conductivity copper alloy plate strip finished product.
By the technical scheme, precipitation strengthening, strain strengthening and fine grain strengthening are comprehensively considered, low-content alloy elements are added for composite microalloying, the content of a single intermetallic compound is reduced, the solid solution time is obviously shortened, fine and uniform alloy grains can be ensured while full solid solution is carried out, the problem of contradiction between full solid solution and grain growth of the high-strength high-conductivity copper alloy is effectively solved, and the strength and the conductivity of the copper alloy are synchronously improved.
The technical solution of the present invention is further described in detail by the following examples. However, the examples are chosen only for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention. In the examples, the apparatus and methods used are those conventional in the art, unless otherwise specified.
Example 1
The elements are mixed according to the weight percentage of Nb 0.02%, Ni 0.6%, Co 0.5%, Si 0.3%, Cr 0.2%, Sn 0.15%, Zn 0.1% and Cu 98.13%;
smelting the mixed metal raw material by adopting a gas-shielded induction smelting method, smelting the raw material at 1200 ℃ for 60min after the raw material is completely molten, then refining to remove slag, standing and degassing to obtain liquid copper alloy;
casting the alloy liquid into a casting ingot with the cross section of 150mm multiplied by 150mm at 1100 ℃, and carrying out homogenization annealing on the casting ingot at 1000 ℃ for 30 min;
hot rolling the copper alloy ingot at 850 ℃ to a thickness of 10mm, then rough rolling for 3 times to a thickness of 1.5mm, intermediate annealing at 800 ℃, and finally cold rolling to a thickness of 0.3 mm;
the cold-rolled copper alloy sheet strip was solutionized in a tunnel furnace at 1000 c for a total time of 25s in the tunnel furnace, 15s in the high temperature zone and then held at 500 c for 2h, and the strength and conductivity were measured, and the results are shown in table 1.
Example 2
The elements are mixed according to the weight percentage of Nb 0.03%, Ni 0.5%, Co 0.4%, Si 0.25%, Cr 0.15%, Sn 0.2%, Zn 0.15% and Cu 98.32%;
smelting the mixed metal raw material by adopting a gas-shielded induction smelting method, smelting the raw material at 1150 ℃ for 50min after the raw material is completely molten, then refining and deslagging, standing and degassing to obtain liquid copper alloy;
casting the alloy liquid into a cast ingot with the cross section of 120mm multiplied by 120mm at 1120 ℃, and carrying out homogenizing annealing on the cast ingot at 1000 ℃ for 40 min;
hot rolling the copper alloy ingot at 900 ℃ to 12mm thick, then rough rolling for 3 times to 2.0mm thick, intermediate annealing at 780 ℃, and finally cold rolling to 0.2mm thick;
the cold-rolled copper alloy sheet strip was solutionized in a tunnel furnace at 1010 ℃ for a total time of 20s in the tunnel furnace, 10s in the high temperature zone, and then held at 480 ℃ for 2.5h, and tested for strength and conductivity, the results obtained are shown in Table 1.
Example 3
The elements are mixed according to the weight percentage of Nb 0.04%, Ni 0.4%, Co 0.5%, Si 0.3%, Cr 0.2%, Sn 0.2%, Zn 0.1% and Cu98.26%;
smelting the mixed metal raw material by adopting a gas-shielded induction smelting method, smelting the raw material at 1250 ℃ for 40min after the raw material is completely molten, then refining to remove slag, standing and degassing to obtain liquid copper alloy;
casting the alloy liquid into a casting ingot with the size of 100mm multiplied by 100mm in cross section at 1130 ℃, and carrying out homogenization annealing on the casting ingot at 980 ℃ for 40 min;
hot rolling the copper alloy ingot at 800 ℃ to 9mm thick, then rough rolling for 3 times to 1.6mm thick, intermediate annealing temperature 780 ℃, and finally cold rolling to 0.25mm thick;
the cold-rolled copper alloy sheet strip was solutionized using a tunnel furnace at 990 ℃ for a total time of 25 seconds in the tunnel furnace, wherein the high temperature zone was 15 seconds, and then held at 480 ℃ for 3 hours, and tested for strength and electrical conductivity, and the results obtained are shown in Table 1.
Example 4
The elements are proportioned according to the weight percentage of La 0.02%, Ni 0.8%, Co 0.7%, Si 0.4%, Cr 0.2%, Sn 0.15%, Zn 0.1%, and Cu97.63%;
smelting the mixed metal raw material by adopting a gas protection induction smelting method, smelting the raw material for 50min at 1230 ℃ after the raw material is completely molten, then refining and deslagging, standing and degassing to obtain liquid copper alloy;
casting the alloy liquid into a cast ingot with the cross section of 180mm multiplied by 180mm at 1150 ℃, and carrying out homogenization annealing on the cast ingot at 990 ℃ for 40 min;
hot rolling the copper alloy ingot at 850 ℃ to 6mm thick, then rough rolling for 3 times to 2.0mm thick, intermediate annealing at 750 ℃, and finally cold rolling to 0.6mm thick;
the cold-rolled copper alloy sheet strip was solutionized in a tunnel furnace at 980 ℃ for a total time of 22s, with a high temperature zone of 12s, and then held at 500 ℃ for 2h, and tested for strength and electrical conductivity, the results obtained being as shown in Table 1.
Example 5
The elements are proportioned according to the weight percentage of La 0.03%, Ni 0.7%, Co 0.6%, Si 0.35%, Cr 0.25%, Sn 0.25%, Zn 0.1% and Cu 97.72%;
smelting the mixed metal raw material by adopting a gas-shielded induction smelting method, smelting the raw material at 1180 ℃ for 30min after the raw material is completely molten, refining to remove slag, and standing to remove gas to obtain liquid copper alloy;
casting the alloy liquid into a casting ingot with the cross section of 160mm multiplied by 160mm at 1140 ℃, and carrying out homogenization annealing on the casting ingot at 950 ℃ for 60 min;
hot rolling the copper alloy ingot at 850 ℃ to 8mm thick, then rough rolling for 3 times to 2.0mm thick, intermediate annealing at 700 ℃, and finally cold rolling to 0.35mm thick;
the cold-rolled copper alloy sheet strip was solutionized in a tunnel furnace at 1000 c for a total time of 25s in the tunnel furnace, 15s in the high temperature zone, and then kept at 520 c for 1.5h, and tested for strength and conductivity, the results obtained are shown in table 1.
Example 6
The elements are proportioned according to the weight percentage of Ce 0.04%, Ni 0.7%, Co 0.5%, Si 0.3%, Cr 0.2%, Sn 0.25%, Zn 0.1%, Cu 97.91%;
smelting the mixed metal raw material by adopting a gas-shielded induction smelting method, smelting the raw material at 1200 ℃ for 50min after the raw material is completely molten, then refining to remove slag, standing and degassing to obtain liquid copper alloy;
casting the alloy liquid into a casting ingot with the size of 200mm multiplied by 200mm of the cross section at 1120 ℃, and carrying out homogenizing annealing on the casting ingot at 1000 ℃ for 40 min;
hot rolling the copper alloy ingot at 900 ℃ to a thickness of 10mm, then rough rolling for 3 times to a thickness of 1.8mm, intermediate annealing at 750 ℃, and finally cold rolling to a thickness of 0.4 mm;
the cold-rolled copper alloy sheet strip was solutionized in a tunnel furnace at 1020 ℃ for a total time of 24s in the tunnel furnace, wherein the high temperature zone was 14s, and then heat-insulated at 480 ℃ for 3h, and the strength and conductivity thereof were measured, and the results obtained are shown in Table 1.
Example 7
The elements are proportioned according to the weight percentage of 0.03 percent of Ce, 1.0 percent of Ni, 0.5 percent of Co, 0.3 percent of Si, 0.25 percent of Cr, 0.25 percent of Sn, 0.1 percent of Zn and 97.87 percent of Cu;
smelting the mixed metal raw material by adopting a gas-shielded induction smelting method, smelting the raw material at 1150 ℃ for 60min after the raw material is completely molten, then refining to remove slag, standing and degassing to obtain liquid copper alloy;
casting the alloy liquid into a cast ingot with the cross section of 150mm multiplied by 150mm at 1120 ℃, and carrying out homogenization annealing on the cast ingot at 960 ℃ for 40 min;
hot rolling the copper alloy ingot at 850 ℃ to 12mm thick, then rough rolling for 3 times to 1.8mm thick, intermediate annealing at 800 ℃, and finally cold rolling to 0.45mm thick;
the cold-rolled copper alloy sheet strip was solutionized in a tunnel furnace at 1000 c for a total time of 25s in the tunnel furnace, 15s in the high temperature zone and then held at 500 c for 2h, and the strength and conductivity were measured, and the results are shown in table 1.
Example 8
The elements are mixed according to the weight percentage of Nb 0.01%, Ni 0.6%, Co 0.5%, Si 0.3%, Cr 0.2%, Sn 0.15%, Zn 0.1%, Cu 98.13%;
smelting the mixed metal raw material by adopting a gas-shielded induction smelting method, smelting the raw material at 1200 ℃ for 60min after the raw material is completely molten, then refining to remove slag, standing and degassing to obtain liquid copper alloy;
casting the alloy liquid into a casting ingot with the cross section of 150mm multiplied by 150mm at 1130 ℃, and carrying out homogenizing annealing on the casting ingot at 1000 ℃ for 30 min;
hot rolling the copper alloy ingot at 850 ℃ to a thickness of 10mm, then rough rolling for 3 times to a thickness of 1.5mm, intermediate annealing at 800 ℃, and finally cold rolling to a thickness of 0.3 mm;
the cold-rolled copper alloy sheet strip was solutionized in a tunnel furnace at 1000 c for a total time of 25s in the tunnel furnace, 15s in the high temperature zone and then held at 500 c for 2h, and the strength and conductivity were measured, and the results are shown in table 1.
Example 9
The elements are mixed according to the weight percentage of Nb 0.05%, Ni 0.5%, Co 0.4%, Si 0.25%, Cr 0.1%, Sn 0.2%, Zn 0.15% and Cu 98.32%;
smelting the mixed metal raw material by adopting a gas-shielded induction smelting method, smelting the raw material at 1150 ℃ for 50min after the raw material is completely molten, then refining and deslagging, standing and degassing to obtain liquid copper alloy;
casting the alloy liquid into an ingot with the cross section of 120mm multiplied by 120mm at 1150 ℃, and carrying out homogenizing annealing on the ingot at 1000 ℃ for 40 min;
hot rolling the copper alloy ingot at 900 ℃ to 12mm thick, then rough rolling for 3 times to 2.0mm thick, intermediate annealing at 780 ℃, and finally cold rolling to 0.2mm thick;
the cold-rolled copper alloy sheet strip was solutionized in a tunnel furnace at 1010 ℃ for a total time of 20s in the tunnel furnace, 10s in the high temperature zone, and then held at 480 ℃ for 2.5h, and tested for strength and conductivity, the results obtained are shown in Table 1.
Example 10
The elements are mixed according to the weight percentage of Nb 0.04%, Ni 0.4%, Co 0.5%, Si 0.3%, Cr 0.2%, Sn 0.2%, Zn 0.12% and Cu 98.26%;
smelting the mixed metal raw material by adopting a gas-shielded induction smelting method, smelting the raw material at 1250 ℃ for 40min after the raw material is completely molten, then refining to remove slag, standing and degassing to obtain liquid copper alloy;
casting the alloy liquid into an ingot with the size of 100mm multiplied by 100mm in cross section at 1150 ℃, and carrying out homogenization annealing on the ingot at 980 ℃ for 40 min;
hot rolling the copper alloy ingot at 800 ℃ to 9mm thick, then rough rolling for 3 times to 1.6mm thick, intermediate annealing temperature 780 ℃, and finally cold rolling to 0.25mm thick;
the cold-rolled copper alloy sheet strip was solutionized using a tunnel furnace at 990 ℃ for a total time of 25 seconds in the tunnel furnace, wherein the high temperature zone was 15 seconds, and then held at 480 ℃ for 3 hours, and tested for strength and electrical conductivity, and the results obtained are shown in Table 1.
Example 11
The elements are proportioned according to the weight percentage of La 0.02%, Ni 0.8%, Co 1.0%, Si 0.4%, Cr 0.2%, Sn 0.1%, Zn 0.05% and Cu97.63%;
smelting the mixed metal raw material by adopting a gas protection induction smelting method, smelting the raw material for 50min at 1230 ℃ after the raw material is completely molten, then refining and deslagging, standing and degassing to obtain liquid copper alloy;
casting the alloy liquid into a cast ingot with the cross section of 180mm multiplied by 180mm at 1150 ℃, and carrying out homogenization annealing on the cast ingot at 990 ℃ for 40 min;
hot rolling the copper alloy ingot at 850 ℃ to 6mm thick, then rough rolling for 3 times to 2.0mm thick, intermediate annealing at 750 ℃, and finally cold rolling to 0.6mm thick;
the cold-rolled copper alloy sheet strip was solutionized in a tunnel furnace at 980 ℃ for a total time of 22s, with a high temperature zone of 12s, and then held at 500 ℃ for 2h, and tested for strength and electrical conductivity, the results obtained being as shown in Table 1.
Example 12
The elements are proportioned according to the weight percentage of La 0.03%, Ni 0.7%, Co 0.6%, Si 0.35%, Cr 0.25%, Sn 0.2%, Zn 0.1% and Cu 97.72%;
smelting the mixed metal raw material by adopting a gas-shielded induction smelting method, smelting the raw material at 1180 ℃ for 30min after the raw material is completely molten, refining to remove slag, and standing to remove gas to obtain liquid copper alloy;
casting the alloy liquid into an ingot with the cross section of 160mm multiplied by 160mm at 1150 ℃, and carrying out homogenization annealing on the ingot at 950 ℃ for 60 min;
hot rolling the copper alloy ingot at 850 ℃ to 8mm thick, then rough rolling for 3 times to 2.0mm thick, intermediate annealing at 700 ℃, and finally cold rolling to 0.35mm thick;
the cold-rolled copper alloy sheet strip was solutionized in a tunnel furnace at 1000 c for a total time of 25s in the tunnel furnace, 15s in the high temperature zone, and then kept at 520 c for 1.5h, and tested for strength and conductivity, the results obtained are shown in table 1.
Example 13
The elements are mixed according to the weight percentage of Ce 0.04%, Ni 0.7%, Co 0.5%, Si 0.1%, Cr 0.2%, Sn 0.3%, Zn 0.1%, and Cu97.91%;
smelting the mixed metal raw material by adopting a gas-shielded induction smelting method, smelting the raw material at 1200 ℃ for 50min after the raw material is completely molten, then refining to remove slag, standing and degassing to obtain liquid copper alloy;
casting the alloy liquid into an ingot with the cross section of 200mm multiplied by 200mm at 1150 ℃, and carrying out homogenizing annealing on the ingot at 1000 ℃ for 40 min;
hot rolling the copper alloy ingot at 900 ℃ to a thickness of 10mm, then rough rolling for 3 times to a thickness of 1.8mm, intermediate annealing at 750 ℃, and finally cold rolling to a thickness of 0.4 mm;
the cold-rolled copper alloy sheet strip was solutionized in a tunnel furnace at 1020 ℃ for a total time of 24s in the tunnel furnace, wherein the high temperature zone was 14s, and then heat-insulated at 480 ℃ for 3h, and the strength and conductivity thereof were measured, and the results obtained are shown in Table 1.
Example 14
The elements are proportioned according to the weight percentage of 0.03 percent of Ce, 1.0 percent of Ni, 0.3 percent of Co, 0.2 percent of Si, 0.3 percent of Cr, 0.3 percent of Sn, 0.15 percent of Zn and 97.87 percent of Cu;
smelting the mixed metal raw material by adopting a gas-shielded induction smelting method, smelting the raw material at 1150 ℃ for 60min after the raw material is completely molten, then refining to remove slag, standing and degassing to obtain liquid copper alloy;
casting the alloy liquid into a casting ingot with the cross section of 150mm multiplied by 150mm at 1100 ℃, and carrying out homogenization annealing on the casting ingot at 960 ℃ for 40 min;
hot rolling the copper alloy ingot at 850 ℃ to 12mm thick, then rough rolling for 3 times to 1.8mm thick, intermediate annealing at 800 ℃, and finally cold rolling to 0.45mm thick;
the cold-rolled copper alloy sheet strip was solutionized in a tunnel furnace at 1000 c for a total time of 25s in the tunnel furnace, 15s in the high temperature zone and then held at 500 c for 2h, and the strength and conductivity were measured, and the results are shown in table 1.
TABLE 1 tensile strength and conductivity of multi-component microalloyed high-strength high-conductivity copper alloy material
Tensile Strength tensile Strain Rate 1X 10 in Table 1 above-3。
The numbers in Table 1 indicate the high-strength and high-conductivity copper alloys in examples 1 to 14.
In addition, the inventors have also conducted experiments with other raw materials and conditions and the like listed in the present specification in the manner of examples 1 to 14, and also produced copper alloy materials having higher strength and conductivity.
Comparative example 1
The copper alloy material obtained was found to have a tensile strength of 676MPa and an electric conductivity of 59% IACS in the same manner as in example 1 except that the Co element was not added. Although the conductivity increased after the reduction of the alloying elements in this comparative example, it resulted in a decrease in strength.
Comparative example 2
In the absence of Ni element, the copper alloy material obtained in the same manner as in example 2 had a tensile strength of 664MPa and an electrical conductivity of 62% IACS.
Comparative example 3
In the absence of the rare earth element, the copper alloy material obtained in the same manner as in example 3 had a tensile strength of 672MPa and an electrical conductivity of 59% IACS.
Comparative example 4
In the absence of Cr element, the tensile strength of the copper alloy material obtained was 641MPa and the electrical conductivity was 60% IACS in the same manner as in example 4.
Comparative example 5
In the absence of Sn element, the tensile strength of the copper alloy material obtained was 624MPa and the electrical conductivity was 65% IACS, as in example 5.
Comparative example 6
In the absence of Zn element, the copper alloy material obtained was the same as in example 6, and had a tensile strength of 619MPa and an electrical conductivity of 70% IACS.
Comparative example 7
In the absence of Si element, the copper alloy material obtained in the same manner as in example 7 had a tensile strength of 584MPa and an electric conductivity of 50% IACS.
Comparative example 8
The solid solution time in this comparative example was 30 minutes, and the same as in example 9, the copper alloy material obtained therefrom had a tensile strength of 600MPa and an electric conductivity of 62% IACS.
It should be understood that the above-mentioned embodiments are merely illustrative of the technical concepts and features of the present invention, which are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and therefore, the protection scope of the present invention is not limited thereby. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. A multi-element composite microalloyed high-strength high-conductivity copper alloy material is characterized by comprising the following components in percentage by mass: 0.4 to 1.0% of Ni, 0.3 to 1.0% of Co, 0.1 to 0.4% of Si, 0.1 to 0.3% of Cr, 0.1 to 0.3% of Sn, 0.05 to 0.15% of Zn, 0.01 to 0.05% of rare earth elements and the balance of Cu.
2. The multi-element composite microalloyed high-strength high-conductivity copper alloy material according to claim 1, characterized in that: the rare earth element comprises any one or the combination of more than two of Nb, La and Ce.
3. The multi-element composite microalloyed high-strength high-conductivity copper alloy material according to claim 1, characterized in that: the tensile strength of the multi-component composite microalloyed high-strength high-conductivity copper alloy is 690-730 MPa, and the electrical conductivity of the multi-component composite microalloyed high-strength high-conductivity copper alloy is 55-60% IACS.
4. The method for preparing the multi-element composite microalloyed high-strength high-conductivity copper alloy material as claimed in any one of claims 1 to 3, characterized by comprising the following steps:
the components in the multi-element composite microalloyed high-strength high-conductivity copper alloy material are mixed and smelted to obtain liquid copper alloy;
and casting the liquid copper alloy into a copper alloy ingot, and then sequentially carrying out annealing treatment, rolling treatment, solid solution treatment and aging treatment to obtain the multi-element composite microalloyed high-strength high-conductivity copper alloy material.
5. The preparation method according to claim 4, characterized by specifically comprising: and (3) burdening each component in the multi-component composite microalloyed high-strength high-conductivity copper alloy material, mixing, smelting at 1150-1250 ℃ for 30-60 min, refining, deslagging, standing and degassing to obtain the liquid copper alloy.
6. The preparation method according to claim 4, characterized by specifically comprising: and casting the liquid copper alloy into a copper alloy ingot with a square section and a side length of 100-200 mm at 1100-1150 ℃.
7. The preparation method according to claim 4, characterized by specifically comprising: and (3) placing the copper alloy ingot in an induction coil device, heating to the temperature of 950-1000 ℃, and preserving heat for 30-60 min to carry out annealing treatment.
8. The preparation method according to claim 7, characterized by specifically comprising: hot rolling the copper alloy ingot obtained by annealing treatment at 800-900 ℃ until the thickness is 6-12 mm, then rough rolling until the thickness is 1.5-2 mm, the rough rolling processing amount is 20-30%, and the intermediate annealing temperature is 700-800 ℃; and finally, rolling to the thickness of 0.2-0.6 mm, thereby finishing the rolling treatment.
9. The method according to claim 8, comprising: and carrying out solution treatment on the copper alloy strip obtained by rolling treatment at 980-1020 ℃ for 20-25 s in total, wherein the retention time in a high-temperature area is 10-15 s.
10. The method according to claim 9, comprising: carrying out aging treatment on the copper alloy plate strip obtained through the solution treatment at 480-520 ℃ for 1.5-3 h;
and/or, the preparation method further comprises the following steps: and straightening, cutting and packaging the copper alloy plate strip obtained by aging treatment.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115044846A (en) * | 2022-06-23 | 2022-09-13 | 中国科学院宁波材料技术与工程研究所 | CuCrSn alloy and deformation heat treatment method thereof |
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