CN111411315A - Processing method for improving structural uniformity of large-size Nb-Ti alloy bar - Google Patents
Processing method for improving structural uniformity of large-size Nb-Ti alloy bar 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
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals 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
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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Abstract
The invention relates to a processing method for improving the structural uniformity of a large-size Nb-Ti alloy bar, which adopts sufficient cogging deformation for producing a bar with NbTi phi 160-240 mm, provides more deformation energy for subsequent homogenization heat treatment, improves the atomic diffusion capability, and promotes the homogenization heat treatment to be more sufficient and better in effect. And after the homogenization heat treatment, two times of radial forging are adopted to ensure that the two ends of the bar are uniformly and consistently deformed, and simultaneously, one-time axial upsetting-pulling forging is adopted between the two times of radial forging to improve the structural uniformity of the bar. After the upsetting and drawing process is finished, the whole drawing process that the bar is deformed from the large-section blank to the small-section blank is carried out, the blank drawing process enables the cross section of the blank to be in the circular deformation process all the time, and the uniform deformation of the cross section is ensured.
Description
Technical Field
The invention relates to the technical field of alloy bar processing, in particular to a processing method for improving the structural uniformity of a large-size Nb-Ti alloy bar.
Background
The titanium content in the Nb-Ti superconducting alloy is 44-65% (wt), and the alloy not only has good room temperature and high temperature mechanical properties and corrosion resistance, but also has excellent cold and hot processing performance, formability and welding performance. The Nb-Ti superconducting alloy mainly researched by the patent has a niobium content of 45-54% (wt/%), and is mainly used in the fields of superconducting nuclear Magnetic Resonance (MRI) systems, nuclear magnetic resonance scanners (NMR) and superconducting cavities, so that the Nb-Ti superconducting alloy has higher requirements on the grain size uniformity of NbTi bars with the external diameter specification of phi 160-240 mm so as to ensure the uniformity and quality stability of the processing deformation of later-stage finished wire products.
The manufacturer which can be used as Nb-Ti material in China is few, and the prior art has relatively mature technology in the aspects of chemical composition, performance control and the like of the material and has certain production capacity. In order to improve the performance of the material, the conventional process adopts forging modes such as conventional upsetting-pulling (single axial upsetting-pulling), increased deformation and the like to process the bar, so that the problems of excessive core overheating or insufficient core forging, overlarge core grain size, overlarge core and edge grain size deviation, large grain size difference at two ends of the bar and the like are easily caused.
Disclosure of Invention
In view of the above, there is a need to provide a processing method for improving the structural uniformity of large-size Nb-Ti alloy bars.
A processing method for improving the structural uniformity of a large-size Nb-Ti alloy bar comprises the following steps,
(1) a, preparing a bar blank, namely, cogging forging, namely heating NbTi cast ingots to 1150-1250 ℃, and performing upsetting-drawing forging for 2 times, wherein the deformation per time is ensured to be more than 85%, so that the original as-cast structure is fully crushed, and uniform β grains are obtained;
b. high-temperature homogenization heat treatment: preserving the temperature of the blank forged by cogging in the step a for 20 hours at 1100-1300 ℃, and carrying out homogenization heat treatment to ensure that metal atoms in the bar blank move violently, so that the metal atoms are distributed more uniformly and tightly;
(2) forging the intermediate blank: c, forging the blank subjected to the high-temperature homogenization heat treatment in the step b at 950-1100 ℃ for 3-4 times, wherein the deformation amount of each time is more than 75%;
(3) forging a finished product: carrying out 2-3 times of hot drawing forging on the forged intermediate forging stock at 900-1000 ℃, wherein the deformation amount of each time is 25-40%, and air cooling treatment is adopted after forging;
(4) and (3) thermal straightening: preserving the heat of the blank forged by the finished product in the step (3) for 1.5-2 h at the temperature of 800-900 ℃;
(5) surface treatment: machining the blank subjected to the thermal straightening treatment in the step (4) to remove an outer-layer oxide skin, and polishing and removing 0.05-0.1 mm in a surface polishing mode;
(6) and (3) brightening treatment: and (5) carrying out acid washing, water washing and drying treatment on the blank subjected to polishing treatment in the step (5) to finally obtain a finished product.
By adopting the technical scheme, the invention has the beneficial effects that: the method for producing the NbTi phi 160-240 mm bars provided by the invention adopts sufficient cogging variables, so that more distortion energy is provided for subsequent homogenization heat treatment, the atomic diffusion capability is improved, and the homogenization heat treatment is more sufficient and better in effect. And after the homogenization heat treatment, two times of radial forging are adopted to ensure that the two ends of the bar are uniformly and consistently deformed, and simultaneously, one-time axial upsetting-pulling forging is adopted between the two times of radial forging to improve the structural uniformity of the bar.
After the upsetting and drawing process is finished, the whole drawing process that the bar is deformed from the large-section blank to the small-section blank is carried out, the blank drawing process enables the cross section of the blank to be in the circular deformation process all the time, and the uniform deformation of the cross section is ensured.
Drawings
FIG. 1 is a schematic structural diagram of the internal structure of a metal material after the present invention is implemented.
FIG. 2 is a schematic structural diagram of the internal structure of the metal material after the present invention is implemented.
Detailed Description
Referring to fig. 1 to 2, an embodiment of the present invention provides a processing method for improving structural uniformity of a large-sized Nb-Ti alloy bar, where the processing method for improving structural uniformity of a large-sized Nb-Ti alloy bar includes the following steps,
(1) preparing a bar blank, namely, cogging forging, namely heating NbTi cast ingots to 1150-1250 ℃, upsetting and drawing for 2 times, and ensuring that the deformation per time is more than 85%, so that the original as-cast structure is fully crushed, and uniform β grains are obtained;
b. high-temperature homogenization heat treatment: preserving the temperature of the blank forged by cogging in the step a for 20 hours at 1100-1300 ℃, and carrying out homogenization heat treatment to ensure that metal atoms in the bar blank move violently, so that the metal atoms are distributed more uniformly and tightly;
(2) forging the intermediate blank: b, forging the blank subjected to high-temperature homogenization heat treatment in the step b for 3-4 times at the temperature of 950-1100 ℃, wherein the deformation of each time is more than 75%, and after radial forging is performed for every two times, axial upsetting and drawing are performed for one time between the two times of radial forging; in the forging process, the forging temperature of 1-2 times is kept at 1075 ℃, the forging temperature of 3 times is kept at 1025 ℃, and the forging temperature of 4 times is kept at 975 ℃;
(3) forging a finished product: carrying out 2-3 times of hot drawing forging on the forged intermediate forging stock at 900-1000 ℃, wherein the deformation amount of each time is 25-40%, and air cooling treatment is adopted after forging; in the forging process, the forging temperature of 1-2 times is kept at 975 ℃, and the forging temperature of 3 times is kept at 925 ℃; the cross section of the blank can be always in a circular forging process in the blank drawing process, so that the uniform deformation of the whole cross section is ensured;
(4) and (3) thermal straightening: preserving the heat of the blank forged by the finished product in the step (3) for 1.5-2 h at the temperature of 800-900 ℃;
(5) surface treatment: machining the blank subjected to the thermal straightening treatment in the step (4) to remove an outer-layer oxide skin, and polishing to remove 0.05-0.1 mm in a surface polishing mode;
(6) and (3) brightening treatment: and (5) carrying out acid washing, water washing and drying treatment on the blank subjected to polishing treatment in the step (5) to finally obtain a finished product.
Example 2
A processing method for improving the structural uniformity of a large-size Nb-Ti alloy bar comprises the following steps,
(1) preparing a bar blank, namely, cogging forging, namely heating NbTi cast ingots to 1150-1250 ℃, upsetting and drawing for 2 times, and ensuring that the deformation per time is more than 85 percent, so that the original cast structure is fully crushed to obtain uniform β grains, wherein in the cogging forging process, the temperature of the first time upsetting and drawing forging is 1170 ℃, the reduction is 80mm, the temperature of the second time upsetting and drawing forging is 1150 ℃, and the reduction is 80 mm;
b. high-temperature homogenization heat treatment: preserving the temperature of the blank forged by cogging in the step a for 20 hours at 1100-1300 ℃, and carrying out homogenization heat treatment to ensure that metal atoms in the bar blank move violently, so that the metal atoms are distributed more uniformly and tightly;
(2) forging the intermediate blank: b, forging the blank subjected to high-temperature homogenization heat treatment in the step b for 3-4 times at the temperature of 950-1100 ℃, wherein the deformation of each time is more than 75%, and after radial forging is performed for every two times, axial upsetting and drawing are performed for one time between the two times of radial forging; in the forging process, the forging temperature of 1-2 times is kept at 1050 ℃, the forging temperature of 3 times is kept at 1000 ℃, and the forging temperature of 4 times is kept at 950 ℃;
(3) forging a finished product: carrying out 2-3 times of hot drawing forging on the forged intermediate forging stock at 900-1000 ℃, wherein the deformation amount of each time is 25-40%, and air cooling treatment is adopted after forging; in the forging process, the forging temperature of 1-2 times is kept at 950 ℃, and the forging temperature of 3 times is kept at 900 ℃; the cross section of the blank can be always in a circular forging process in the blank drawing process, so that the uniform deformation of the whole cross section is ensured;
(4) and (3) thermal straightening: preserving the heat of the blank forged by the finished product in the step (3) for 1.5-2 h at the temperature of 800-900 ℃;
(5) surface treatment: machining the blank subjected to the thermal straightening treatment in the step (4) to remove an outer-layer oxide skin, and polishing to remove 0.05-0.1 mm in a surface polishing mode;
(6) and (3) brightening treatment: and (5) carrying out acid washing, water washing and drying treatment on the blank subjected to polishing treatment in the step (5) to finally obtain a finished product.
Example 3
A processing method for improving the structural uniformity of a large-size Nb-Ti alloy bar comprises the following steps,
(1) preparing a bar blank, namely, cogging forging, namely heating NbTi cast ingots to 1150-1250 ℃, upsetting and drawing for 2 times, and ensuring that the deformation per time is more than 85 percent, so that the original cast structure is fully crushed, and uniform β grains are obtained;
b. high-temperature homogenization heat treatment: preserving the temperature of the blank forged by cogging in the step a for 20 hours at 1100-1300 ℃, and carrying out homogenization heat treatment to ensure that metal atoms in the bar blank move violently, so that the metal atoms are distributed more uniformly and tightly;
(2) forging the intermediate blank: b, forging the blank subjected to high-temperature homogenization heat treatment in the step b for 3-4 times at the temperature of 950-1100 ℃, wherein the deformation of each time is more than 75%, and after radial forging is performed for every two times, axial upsetting and drawing are performed for one time between the two times of radial forging; in the forging process, the forging temperature of 1-2 times is kept at 1100 ℃, the forging temperature of 3 times is kept at 1050 ℃, and the forging temperature of 4 times is kept at 1000 ℃;
(3) forging a finished product: carrying out 2-3 times of hot drawing forging on the forged intermediate forging stock at 900-1000 ℃, wherein the deformation amount of each time is 25-40%, and air cooling treatment is adopted after forging; in the forging process, the forging temperature of 1-2 times is kept at 1000 ℃, and the forging temperature of 3 times is kept at 950 ℃; the cross section of the blank can be always in a circular forging process in the blank drawing process, so that the uniform deformation of the whole cross section is ensured;
(4) and (3) thermal straightening: preserving the heat of the blank forged by the finished product in the step (3) for 1.5-2 h at the temperature of 800-900 ℃;
(5) surface treatment: machining the blank subjected to the thermal straightening treatment in the step (4) to remove an outer-layer oxide skin, and polishing and removing 0.05-0.1 mm in a surface polishing mode;
(6) and (3) brightening treatment: and (5) carrying out acid washing, water washing and drying treatment on the blank subjected to polishing treatment in the step (5) to finally obtain a finished product.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (3)
1. A processing method for improving the structural uniformity of a large-size Nb-Ti alloy bar is characterized by comprising the following steps: the processing method of the Nb-Ti alloy bar material with the uniform structure comprises the following steps,
(1) a, preparing a bar blank, namely, cogging forging, namely heating NbTi cast ingots to 1150-1250 ℃, and performing upsetting-drawing forging for 2 times, wherein the deformation per time is ensured to be more than 85%, so that the original as-cast structure is fully crushed, and uniform β grains are obtained;
b. high-temperature homogenization heat treatment: preserving the temperature of the blank forged by cogging in the step a for 20 hours at 1100-1300 ℃, and carrying out homogenization heat treatment to ensure that metal atoms in the bar blank move violently, so that the metal atoms are distributed more uniformly and tightly;
(2) forging the intermediate blank: c, forging the blank subjected to the high-temperature homogenization heat treatment in the step b at 950-1100 ℃ for 3-4 times, wherein the deformation amount of each time is more than 75%;
(3) forging a finished product: carrying out 2-3 times of hot drawing forging on the forged intermediate forging stock at 900-1000 ℃, wherein the deformation amount of each time is 25-40%, and air cooling treatment is adopted after forging;
(4) and (3) thermal straightening: preserving the heat of the blank forged by the finished product in the step (3) for 1.5-2 h at the temperature of 800-900 ℃;
(5) surface treatment: machining the blank subjected to the thermal straightening treatment in the step (4) to remove an outer-layer oxide skin, and polishing and removing 0.05-0.1 mm in a surface polishing mode;
(6) and (3) brightening treatment: and (5) carrying out acid washing, water washing and drying treatment on the blank subjected to polishing treatment in the step (5) to finally obtain a finished product.
2. The processing method for improving the structural uniformity of the large-gauge Nb-Ti alloy bar according to claim 1, wherein the processing method comprises the following steps: in the blank opening forging process in the step (1), the temperature of the first hot upsetting forging is 1150-1250 ℃, the reduction is 80-100 mm, the temperature of the second hot upsetting forging is 1130-1200 ℃, and the reduction is 80-100 mm.
3. The processing method for improving the structural uniformity of the large-gauge Nb-Ti alloy bar according to claim 1, wherein the processing method comprises the following steps: and (4) in the forging process of the intermediate blank in the step (3), after radial forging is carried out for every two times, axial upsetting is carried out for one time between the two times of radial forging.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112692203A (en) * | 2020-11-26 | 2021-04-23 | 西部超导材料科技股份有限公司 | Forging method of Nb47Ti alloy large-size bar for superconducting wire |
| CN114178339A (en) * | 2021-12-09 | 2022-03-15 | 宁夏中色金航钛业有限公司 | Fine-grain Ti for 3D printing additive powder making2AlNb alloy bar and preparation method thereof |
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| CN106319236A (en) * | 2016-11-01 | 2017-01-11 | 西北有色金属研究院 | Preparation method of Ti2AlNb alloy material |
| CN107217221A (en) * | 2017-05-22 | 2017-09-29 | 西部超导材料科技股份有限公司 | A kind of preparation method of high uniform Ti 15Mo titanium alloy bar stocks |
| CN107413998A (en) * | 2017-07-03 | 2017-12-01 | 西部超导材料科技股份有限公司 | A kind of preparation method of Nb47Ti alloys large scale rod bar |
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- 2020-03-16 CN CN202010181253.9A patent/CN111411315A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106319236A (en) * | 2016-11-01 | 2017-01-11 | 西北有色金属研究院 | Preparation method of Ti2AlNb alloy material |
| CN107217221A (en) * | 2017-05-22 | 2017-09-29 | 西部超导材料科技股份有限公司 | A kind of preparation method of high uniform Ti 15Mo titanium alloy bar stocks |
| CN107413998A (en) * | 2017-07-03 | 2017-12-01 | 西部超导材料科技股份有限公司 | A kind of preparation method of Nb47Ti alloys large scale rod bar |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112692203A (en) * | 2020-11-26 | 2021-04-23 | 西部超导材料科技股份有限公司 | Forging method of Nb47Ti alloy large-size bar for superconducting wire |
| CN114178339A (en) * | 2021-12-09 | 2022-03-15 | 宁夏中色金航钛业有限公司 | Fine-grain Ti for 3D printing additive powder making2AlNb alloy bar and preparation method thereof |
| CN114178339B (en) * | 2021-12-09 | 2023-05-16 | 宁夏中色金航钛业有限公司 | 3D prints fine grain Ti for material increase powder process 2 AlNb alloy bar and preparation method thereof |
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