High-strength texture metal strip and preparation method thereof
By adding W, Al, Ti and Mo elements to Ni-based alloys and combining hot rolling and aging treatment, high-strength cubic textured metal strips are formed, solving the problem of balancing cubic texture and strength, and meeting the application requirements of high-temperature coated superconducting strips.
Patent Information
- Application Number
- CN202511002816.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-21
- Publication Date
- 2025-10-28
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing technologies struggle to maintain the cubic texture content of high-temperature coated superconducting tapes while simultaneously increasing their strength, making it difficult to meet the application requirements of second-generation high-temperature coated superconducting tapes.
By adding appropriate amounts of W, Al, Ti, and Mo elements to Ni-based alloys, controlling the final rolling temperature of hot rolling, combining large deformation cold rolling and high-temperature recrystallization annealing, and then performing aging treatment, dispersed nano-precipitates are formed to improve strength while maintaining the integrity of the cubic texture.
High-strength metal strips have been achieved, with a cubic texture content of not less than 95% and a yield strength of not less than 420MPa, meeting the application requirements of high-temperature coated superconducting strips.
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Figure CN120843890A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of metal substrate preparation technology for high-temperature coated superconducting tapes, and specifically to a method for preparing high-strength metal tapes. Background Technology
[0002] Textured metal substrates used in second-generation high-temperature superconducting tapes require strong cubic texture and high mechanical properties, such as high yield strength. Currently, strong cubic texture is easily obtained in high fault-energy metal tapes, but their strength is usually low, making it difficult to apply to coated superconducting tapes. Typically, as strength increases, such as through solid solution strengthening, the cubic texture content decreases significantly; that is, cubic texture and mechanical properties are difficult to achieve simultaneously. Methods for controlling cubic texture and mechanical properties in monolayer metal tapes are rarely reported, and single solid solution strengthening methods are insufficient to simultaneously achieve strong cubic texture formation. Therefore, developing new strengthening mechanisms suitable for cubic texture formation and methods for preparing high-strength cubic textured tapes is of significant industrial value in promoting the industrialization of second-generation high-temperature coated superconducting tapes. Summary of the Invention
[0003] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a high-strength textured metal strip and its preparation method, so as to further improve the strength of the strip without weakening the cubic texture of the strip.
[0004] Therefore, the present invention provides a high-strength textured metal strip, which is a Ni-based alloy, wherein the added alloying elements are 5-6% W, 0.9-1% Al, 0.6-0.8% Ti, 0.5-0.7% Mo, 1.5-2% Cu, and the remainder is Ni, all by weight percentage. The content of the cubic texture of the metal strip is not less than 95%, and the yield strength is not less than 420 MPa.
[0005] As a preferred embodiment, the thickness of the metal strip is 80 μm.
[0006] On the other hand, the present invention provides a method for manufacturing the metal strip as described in claim 1, comprising the following steps: Step (1): obtaining a Ni-based alloy with the composition as described in claim 1 by melting and forging, with the final forging temperature controlled above 1000℃; Step (2): hot rolling the forging billet obtained in step (1), wherein the hot rolling heating temperature is 1200℃, the hot rolling thickness is 12-15mm, the total deformation is above 50%, the final rolling temperature is controlled above 1000℃, and the deformation per hot rolling pass is 30%-40%; Step (3): grinding the oxide scale on the surface of the hot-rolled plate obtained in step (2) and then cold rolling it to a thickness of 80-90μm; Step (4): heat-treating the cold-rolled strip obtained in step (3), wherein the process is: holding at 1200℃ for 10-30min and then immediately quenching and cooling, with a heating time of less than 2min; Step (5): heat-treating the strip obtained in step (4) again, specifically holding at 680-750℃ for 5 hours.
[0007] As a preferred embodiment, in step (4), the heat treatment atmosphere is vacuum protection, and the quenching atmosphere is argon.
[0008] As a preferred embodiment, in step (1), the final forging temperature is controlled at 1030℃; in step (2), the hot-rolled thickness is 15mm, the total deformation is more than 55%, the final rolling temperature is controlled at 1040℃, and the deformation per hot rolling pass is 40%; in step (3), the oxide scale on the surface of the hot-rolled plate obtained in step (2) is polished and then cold-rolled to a thickness of 90μm; in step (4), the process is: quenching and cooling immediately after holding at 1200℃ for 30min, the heat treatment atmosphere is vacuum protection, the heating time is less than 2min, and the quenching atmosphere is argon; in step (5), the specific process is holding at 750℃ for 5 hours.
[0009] As a preferred embodiment, in step (1), the final forging temperature is controlled at 1020℃; in step (2), the hot-rolled thickness is 12mm, the total deformation is 60%, the final rolling temperature is controlled at 1020℃, and the deformation per hot rolling pass is 30%; in step (3), the oxide scale on the surface of the hot-rolled plate obtained in step (2) is polished and then cold-rolled to a thickness of 80μm; in step (4), the process is: quenching and cooling immediately after holding at 1200℃ for 10min, the heat treatment atmosphere is vacuum protection, the heating time is less than 2min, and the quenching atmosphere is argon; in step (5), the specific process is holding at 680℃ for 5 hours.
[0010] Compared with the prior art, the present invention, through alloy composition design, adds appropriate amounts of elements such as Ti, Al and Mo, controls the final rolling temperature of hot rolling, and then after large deformation cold rolling, first adopts high temperature recrystallization annealing to obtain a strong cubic texture, and then performs aging treatment to obtain high-strength strip without weakening the cubic texture through precipitation strengthening.
[0011] The beneficial technical effects of this invention are as follows: High W and Mo content reduces stacking fault energy, which impairs the strength of recrystallized cubic texture. This invention compensates for the shortcomings of high W and Mo by adding an appropriate amount of Cu, and utilizes high-temperature recrystallization to form a strong cubic texture. After high-temperature recrystallization, the alloying elements are in a solid solution state. Utilizing the supersaturation of Ti and Al, a large number of dispersed Al-rich and Ti-rich nanoprecipitates are obtained through a subsequent low-temperature aging process, further improving the strength of the strip without weakening its cubic texture. Attached Figure Description
[0012] Figure 1 This is the final microstructure of the strip in Example 1 of the present invention.
[0013] Figure 2 This is the final microstructure of the strip in Example 2 of the present invention.
[0014] Figure 3 This is the final microstructure of the strip in Example 3 of the present invention.
[0015] Figure 4 This is a table showing the tensile strength of the strip material of the present invention and the cubic texture content obtained by XRD testing. Detailed Implementation
[0016] In the following description, embodiments of a high-strength textured metal strip and its preparation method according to the present invention will be described with reference to the accompanying drawings.
[0017] The embodiments described herein are specific implementations of the present invention, used to illustrate the concept of the invention, and are illustrative and exemplary, and should not be construed as limiting the embodiments or scope of the present invention. In addition to the embodiments described herein, those skilled in the art can employ other obvious technical solutions based on the content disclosed in the claims and specification of this application. These technical solutions include any obvious substitutions and modifications made to the embodiments described herein.
[0018] The accompanying drawings in this specification are schematic diagrams used to illustrate the concept of the invention and to schematically show the shapes of the various parts and their interrelationships. Please note that the drawings are not necessarily drawn to the same scale.
[0019] The high-strength textured metal strip of the present invention is a Ni-based alloy, wherein the added alloying elements are 5-6% W, 0.9-1% Al, 0.6-0.8% Ti, 0.5-0.7% Mo, 1.5-2% Cu, and the remainder is Ni, all by weight percentage. The cubic texture content of the metal strip is not less than 95%, and the yield strength is not less than 420 MPa. The thickness of the composite strip is preferably 80 μm.
[0020] A method for manufacturing the aforementioned metal strip according to the present invention includes the following steps:
[0021] Step (1): Obtain a Ni-based alloy with the composition described in claim 1 by smelting, and forge it, with the final forging temperature controlled above 1000℃;
[0022] Step (2): The forging billet obtained in step (1) is hot rolled, wherein the hot rolling heating temperature is 1200℃, the hot rolling thickness is 12~15mm, the total deformation is more than 50%, the final rolling temperature is controlled above 1000℃, and the deformation per hot rolling pass is 30%~40%.
[0023] Step (3): Grind the oxide scale on the surface of the hot-rolled plate obtained in step (2) and then cold roll it to a thickness of 80-90 μm;
[0024] Step (4): The cold-rolled strip obtained in step (3) is subjected to heat treatment. The process is as follows: hold at 1200℃ for 10 to 30 minutes and then quench and cool immediately. The heating time is less than 2 minutes.
[0025] Step (5): The strip obtained in step (4) is then subjected to heat treatment. The specific process is to keep it at 680-750℃ for 5 hours.
[0026] Three specific examples are given below with reference to the attached diagram.
[0027] Example 1
[0028] Nickel alloy ingots were obtained by vacuum induction melting. The alloy composition was: 7% W, 1% Al, 0.6% Ti, 0.7% Mo, 2% Cu, and the remainder Ni, all by weight percentage. The melted alloy was then forged, with the final forging temperature controlled at 1020℃.
[0029] Then it is hot rolled, wherein the hot rolling heating temperature is 1200℃, the hot rolling thickness is 12mm, the total deformation is 60%, the final rolling temperature is controlled at 1020℃, and the deformation per hot rolling pass is 30%.
[0030] The oxide scale on the surface of the hot-rolled plate is polished and then cold-rolled to a thickness of 80μm.
[0031] The obtained cold-rolled strip was subjected to heat treatment. The process was as follows: heat treatment at 1200℃ for 10 minutes followed by immediate quenching and cooling. The heat treatment atmosphere was vacuum protection, the heating time was less than 2 minutes, and the quenching atmosphere was argon.
[0032] To further improve the strength of the cubic textured tape, the tape was finally kept at 680℃ for 5 hours.
[0033] The microstructure of the metal strip obtained in Example 1 is as follows: Figure 1 As shown, a large number of nanoscale precipitates containing Al and Ti are formed, with yield strength and cubic texture content as shown. Figure 4 As shown in the table, the cubic texture content reaches 97%, and the yield strength of this precipitation-strengthened alloy reaches 420 MPa, compared to only about 200 MPa for the Ni7W alloy.
[0034] Example 2
[0035] Nickel alloy ingots were obtained by vacuum induction melting. The alloy composition was: 8% W, 0.9% Al, 0.8% Ti, 0.5% Mo, 1.5% Cu, and the remainder Ni, all by weight percentage. The melted alloy was then forged, with the final forging temperature controlled at 1030℃.
[0036] Then it is hot rolled, wherein the hot rolling heating temperature is 1200℃, the hot rolling thickness is 15mm, the total deformation is more than 55%, the final rolling temperature is controlled at 1040℃, and the deformation per hot rolling pass is 40%.
[0037] The oxide scale on the surface of the hot-rolled plate is polished and then cold-rolled to a thickness of 90μm.
[0038] The obtained cold-rolled strip was subjected to heat treatment. The process was as follows: heat treatment at 1200℃ for 30 minutes followed by immediate quenching and cooling. The heat treatment atmosphere was vacuum protection, the heating time was less than 2 minutes, and the quenching atmosphere was argon.
[0039] To further improve the strength of the cubic textured tape, the tape was finally kept at 750℃ for 5 hours.
[0040] The microstructure of the metal strip obtained in Example 2 is as follows: Figure 2 As shown, a large number of nanoscale precipitates containing Al and Ti are formed, with yield strength and cubic texture content as shown. Figure 4 As shown in the table, the cubic texture content reaches 95%, and the yield strength of this precipitation-strengthened alloy reaches 465 MPa, compared to only about 200 MPa for the Ni7W alloy.
[0041] Example 3
[0042] Nickel alloy ingots were obtained by vacuum induction melting. The alloy composition was: 9% W, 0.9% Al, 0.8% Ti, 0.5% Mo, 1.7% Cu, and the remainder Ni, all by weight percentage. The melted alloy was then forged, with the final forging temperature controlled above 1030℃.
[0043] Then it is hot rolled, wherein the hot rolling heating temperature is 1200℃, the hot rolling thickness is 14mm, the total deformation is 57%, the final rolling temperature is controlled at 1020℃, and the deformation per hot rolling pass is 40%.
[0044] The oxide scale on the surface of the hot-rolled plate is polished and then cold-rolled to a thickness of 90μm.
[0045] The obtained cold-rolled strip was subjected to heat treatment. The process was as follows: heat treatment at 1200℃ for 30 minutes followed by immediate quenching and cooling. The heat treatment atmosphere was vacuum protection, the heating time was less than 2 minutes, and the quenching atmosphere was argon.
[0046] To further improve the strength of the cubic textured tape, the tape was finally kept at 700℃ for 5 hours.
[0047] The microstructure of the metal strip obtained in Example 3 is as follows: Figure 3 As shown, a large number of nanoscale precipitates containing Al and Ti are formed, with yield strength and cubic texture content as shown. Figure 4 As shown in the table, the cubic texture content reaches 95%, and the yield strength of this precipitation-strengthened alloy reaches 460 MPa, compared to the yield strength of the Ni7W binary alloy, which is only about 200 MPa.
[0048] The embodiments of a high-strength textured metal strip and its preparation method according to the present invention have been described above, with the aim of explaining the spirit of the present invention. Specific features of the present invention can be specifically designed based on the functions of the features disclosed above, and these designs are all achievable by those skilled in the art. Furthermore, the technical features disclosed above are not limited to combinations with other features already disclosed; those skilled in the art can also make other combinations between the technical features according to the purpose of the present invention to achieve the objective of the present invention.
Claims
1. A high-strength textured metal strip, wherein the metal strip is a Ni-based alloy, The added alloying elements are 5-6% W, 0.9-1% Al, 0.6-0.8% Ti, 0.5-0.7% Mo, 1.5-2% Cu, and the remainder is Ni, all by weight percentage. The content of cubic texture of the metal strip is not less than 95%, and the yield strength is not less than 420 MPa.
2. The high-strength textured metal strip as described in claim 1, characterized in that, The thickness of the metal strip is 80 μm.
3. A method for manufacturing the metal strip as described in claim 1, comprising the following steps: Step (1): Obtain a Ni-based alloy with the composition described in claim 1 by smelting, and forge it, with the final forging temperature controlled above 1000℃; Step (2): The forging billet obtained in step (1) is hot rolled, wherein the hot rolling heating temperature is 1200℃, the hot rolling thickness is 12~15mm, the total deformation is more than 50%, the final rolling temperature is controlled above 1000℃, and the deformation per hot rolling pass is 30%~40%. Step (3): Grind the oxide scale on the surface of the hot-rolled plate obtained in step (2) and then cold roll it to a thickness of 80-90 μm; Step (4): The cold-rolled strip obtained in step (3) is subjected to heat treatment. The process is as follows: hold at 1200℃ for 10 to 30 minutes and then quench and cool immediately. The heating time is less than 2 minutes. Step (5): The strip obtained in step (4) is then subjected to heat treatment. The specific process is to keep it at 680-750℃ for 5 hours.
4. The method for preparing the metal strip as described in claim 3, wherein, In step (4), the heat treatment atmosphere is vacuum protection, and the quenching atmosphere is argon.
5. The method for preparing the metal strip as described in claim 3, wherein, In step (1), the final forging temperature is controlled at 1030℃; In step (2), the hot-rolled thickness is 15 mm, the total deformation is more than 55%, the final rolling temperature is controlled at 1040°C, and the deformation per hot rolling pass is 40%. In step (3): the oxide scale on the surface of the hot-rolled plate obtained in step (2) is polished and then cold-rolled to a thickness of 90 μm; In step (4), the process is as follows: heat treatment at 1200℃ for 30 minutes followed by immediate quenching and cooling, the heat treatment atmosphere is vacuum protection, the heating time is less than 2 minutes, and the quenching atmosphere is argon. In step (5), the specific process is to keep warm at 750°C for 5 hours.
6. The method for preparing the metal strip as described in claim 3, wherein, In step (1), the final forging temperature is controlled at 1020℃; In step (2), the hot-rolled thickness is 12 mm, the total deformation is 60%, the final rolling temperature is controlled at 1020℃, and the deformation per hot rolling pass is 30%. In step (3): the oxide scale on the surface of the hot-rolled plate obtained in step (2) is polished and then cold-rolled to a thickness of 80 μm; In step (4), the process is as follows: heat treatment at 1200℃ for 10 min followed by immediate quenching and cooling, the heat treatment atmosphere is vacuum protection, the heating time is less than 2 min, and the quenching atmosphere is argon. In step (5), the specific process is to keep warm at 680°C for 5 hours.