CN113941597A - Pressure processing and annealing process from round wire to strip material - Google Patents
Pressure processing and annealing process from round wire to strip material Download PDFInfo
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- CN113941597A CN113941597A CN202111021624.8A CN202111021624A CN113941597A CN 113941597 A CN113941597 A CN 113941597A CN 202111021624 A CN202111021624 A CN 202111021624A CN 113941597 A CN113941597 A CN 113941597A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
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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
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention provides a pressure processing and annealing process from round wires to strips, which comprises the following steps: s1, selecting a tungsten round wire, S2, rolling the tungsten round wire obtained in the step S1 to enable the tungsten round wire to reach a specified single deformation, S3, repeating the step S2 to enable the tungsten round wire to reach a specified accumulated deformation, and S4, performing recovery annealing heat treatment on the tungsten round wire reaching the specified deformation; the pressure processing and annealing process from the round wire to the strip material provided by the invention can improve the plasticity and toughness of the tungsten wire as much as possible on the premise of smaller tensile strength loss, thereby improving the capability of bearing continuous rolling, and the process can ensure that the strip material obtains high strength, high precision and good winding performance and can be compared favorably with similar products abroad.
Description
Technical Field
The invention relates to the technical field of metal heat treatment, in particular to a pressure processing and annealing process from round wires to strips.
Background
Tungsten metal has a series of excellent characteristics, such as extremely high melting point (3410 ℃), low saturated vapor pressure, low expansibility and dimensional stability at high temperature, excellent high-temperature mechanical properties and special electrical properties. It is the precious properties of tungsten that is used to replace molybdenum metal to prepare high-power electron emission materials such as spiral lines. As a metal having a relatively large tendency to be brittle at low temperature, deep processing of tungsten requires two major problems to be solved. First, the material performance problems, such as stress cracking, creep fatigue, etc., are a problem in material development. Second, material processing and forming techniques. Through analysis of the tungsten forming processing curve, the deep processing of tungsten must be carried out between the ductile-brittle transition temperature and the recrystallization temperature, which is approximately between 450 ℃ and 1200 ℃.
As the slippage system is less, once the work hardening effect caused by the over-high accumulated deformation amount reaches the bearable limit of the material in the pressure processing process of the tungsten wire, the problems of layer cracking, splitting, burrs and the like of the material can occur. The strength and toughness of the tungsten wire are key factors influencing subsequent pressure processing, and potential changes of the performance of the tungsten wire also bring a plurality of uncertain factors to the pressure processing technology. The microstructure of the tungsten wire after pressure processing is fibrous and becomes granular after recrystallization, the proportion of large-angle grain boundaries is greatly increased, which can cause the brittleness of tungsten, so that the tungsten can not be subjected to recrystallization annealing but is subjected to recovery annealing in the pressure processing process of the tungsten, and the processing hardening degree of the tungsten is reduced. The existing metal annealing process almost without exception can result in the improvement of metal ductility and the great reduction of strength.
Disclosure of Invention
The invention aims to provide a pressure processing and annealing process from round wires to strips, which can effectively solve the problems.
The embodiment of the invention is realized by the following technical scheme:
the invention provides a pressure processing and annealing process from round wires to strips in a first aspect, which comprises the following steps:
s1, selecting a tungsten round wire;
s2, rolling the round tungsten wire obtained in the step S1 to enable the round tungsten wire to reach a specified single deformation;
s3, repeating the step S2 to enable the tungsten round wire to reach the specified accumulated deformation;
and S4, performing recovery annealing heat treatment on the tungsten round wire after the specified deformation is achieved.
Further, in step S1, the performance parameters of the circular tungsten wire include:
the tensile strength is 2300MPa to 2400 MPa;
the number of the bending points is 2/10-4/10;
the elongation is 2.0% -3.5%.
Furthermore, the surface of the round tungsten wire is not cracked, and the surface of the round tungsten wire is not provided with wire grooves.
Further, in step S2, the initial diameter of the tungsten round wire at the time of rolling is 0.32 mm.
Further, in step S2, the specified single deformation amount is 3% -20%.
Further, in step S3, the specified cumulative deformation amount is not more than 40%.
Further, in step S4, the temperature of the recovery annealing heat treatment is 700 ℃ to 1400 ℃, and the time of the recovery annealing heat treatment is 0.5h to 1.5 h.
Further, in step S4, the temperature of the recovery annealing heat treatment is 1000 ℃ to 1100 ℃.
The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects:
the pressure processing and annealing process from the round wire to the strip material provided by the invention can improve the plasticity and toughness of the tungsten wire as much as possible on the premise of smaller tensile strength loss, thereby improving the capacity of bearing continuous rolling deformation and subsequent bending and winding performances of the tungsten wire.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
A pressure processing and annealing process from round wire to strip material comprises the following steps:
s1, selecting a round tungsten wire, wherein the round tungsten wire has no crack on the surface and no wire groove on the surface, the tensile strength of the round tungsten wire is 2300-2400 MPa, the number of bending points is 2/10-4/10, and the elongation is 2.0% -3.5%.
And S2, rolling the tungsten round wire obtained in the step S1 to reach a specified deformation amount.
In step S2, the initial diameter of the round tungsten wire is 0.32mm during rolling, and the equal deformation gradient decreases by 3-20% of the single deformation.
And S3, repeating the step S2 to enable the tungsten round wire to reach the specified accumulated deformation, wherein the specified accumulated deformation is not more than 40%.
And S4, performing recovery annealing heat treatment on the tungsten round wire after the specified deformation is achieved.
The temperature of the recovery annealing heat treatment is 700-1400 ℃, and the time of the recovery annealing heat treatment is 0.5-1.5 h.
Preferably, the temperature of the recovery annealing heat treatment is 1000-1100 ℃, and the time of the recovery annealing heat treatment is 0.5-1.5 h.
Example 1
S1, selecting a circular tungsten wire, wherein the circular tungsten wire has no crack on the surface and no wire groove on the surface, the tensile strength of the circular tungsten wire is 2350MPa, the number of bending points is 3/10, and the elongation rate is 3%.
S2, rolling the tungsten round wire obtained in the step S1 to reach a specified deformation amount;
during rolling, the initial thickness of the tungsten round wire is 0.32mm, the single equal deformation is pressed, and the single deformation is 3%;
and S3, repeating the step S2 to enable the tungsten round wire to reach the specified accumulated deformation, wherein the specified accumulated deformation is equal to 12.5%.
That is, the thickness of the tungsten round wire is rolled from 0.32mm to 0.31mm, then from 0.31mm to 0.30mm, then from 0.30mm to 0.29mm, then from 0.29mm to 0.28mm, in the process, the single deformation is 3%, and the cumulative deformation is 12.5%.
And S4, performing recovery annealing heat treatment on the tungsten round wire after the deformation is reached.
The temperature of the recovery annealing heat treatment is 1000 ℃, and the time of the recovery annealing heat treatment is 1 h.
Finally, the tungsten tape A1 is obtained.
Example 2
S1, selecting a tungsten round wire, wherein the surface of the tungsten round wire is not cracked, the surface of the tungsten round wire is not provided with deeper wire grooves, the tensile strength of the tungsten round wire is 2350MPa, the number of bending points is 3/10, and the elongation is 3%.
S2, rolling the tungsten round wire obtained in the step S1 to reach a specified deformation amount;
during rolling, the initial diameter of the tungsten round wire is 0.32mm, the single equal deformation is pressed, and the single deformation is 5%;
and S3, repeating the step S2 to enable the tungsten round wire to reach the specified accumulated deformation, wherein the specified accumulated deformation is equal to 25%.
That is, the tungsten round wire is rolled from 0.32mm to 0.304mm, then from 0.304mm to 0.288mm, then from 0.288mm to 0.274mm, then from 0.274mm to 0.260mm, then from 0.260mm to 0.247cm, in the process, the single deformation is 5%, and the cumulative deformation is 25%.
And S4, performing recovery annealing heat treatment on the tungsten round wire after the deformation is reached.
The temperature of the recovery annealing heat treatment is 1100 ℃, and the time of the recovery annealing heat treatment is 1.2 h.
Finally, the tungsten tape A2 is obtained.
Example 3
S1, selecting a tungsten round wire, wherein the surface of the tungsten round wire is not cracked and has no wire grooves, the tensile strength of the tungsten round wire is 2300MPa, the number of bending points is 2/10, and the elongation is 2%.
S2, rolling the tungsten round wire obtained in the step S1 to reach a specified deformation amount;
during rolling, the initial thickness of the tungsten round wire is 0.32mm, the single equal deformation is pressed, and the single deformation is 10%;
and S3, repeating the step S2 to enable the tungsten round wire to reach the specified accumulated deformation, wherein the specified accumulated deformation is equal to 30%.
Namely, the thickness of the tungsten round wire is rolled from 0.32mm to 0.288mm, then is rolled from 0.288mm to 0.26mm, and then is rolled from 0.26 to 0.235 mm. In this process, the single deformation amount was 10%, and the cumulative deformation amount was 30%.
S4, carrying out recovery annealing heat treatment on the tungsten round wire after reaching the specified deformation;
the temperature of the recovery annealing heat treatment is 1100 ℃, and the time of the recovery annealing heat treatment is 1.5 h.
Finally, the tungsten tape A3 is obtained.
Example 4
S1, selecting a circular tungsten wire, wherein the circular tungsten wire has no crack on the surface and no deeper wire groove on the surface, the tensile strength of the circular tungsten wire is 2400MPa, the number of bending points is 4/10, and the elongation is 3.5%.
S2, rolling the tungsten round wire obtained in the step S1 to reach a specified deformation amount;
during rolling, the initial thickness of the tungsten round wire is 0.32mm, the single equal deformation is pressed, and the single deformation is 15%;
and S3, repeating the step S2 to enable the tungsten round wire to reach the specified accumulated deformation, wherein the specified accumulated deformation is equal to 30%.
That is, the thickness of the tungsten round wire is rolled from 0.32mm to 0.275mm, and then from 0.275mm to 0.235cm, and the cumulative deformation amount is 30%.
S4, carrying out recovery annealing heat treatment on the tungsten round wire after reaching the specified deformation;
the temperature of the recovery annealing heat treatment is 1200 ℃, and the time of the recovery annealing heat treatment is 1.5 h.
Finally, the tungsten tape A4 is obtained.
Comparative example 1
The remaining characteristics were the same as those of example 1, except that there was no recovery annealing heat treatment process, and a tungsten ribbon D1 was finally obtained.
Comparative example 2
The remaining characteristics were the same as those of example 1, except that the temperature of the recovery annealing heat treatment was 500 ℃ and the time of the recovery annealing heat treatment was 0.3h, to finally obtain a tungsten ribbon D2.
Comparative example 3
The remaining characteristics were the same as those of example 1, except that the temperature of the recovery annealing heat treatment was 1500 ℃ and the time of the recovery annealing heat treatment was 2 hours, to finally obtain a tungsten tape D3.
Comparative example 4
The remaining characteristics were the same as in example 1, except that, in the rolling, the thickness of the tungsten round wire was directly rolled from 0.32mm to 0.28mm, and finally the tungsten tape D4 was obtained.
Examples of the experiments
The tensile strength and ductility (in terms of elongation) of the above-described tungsten tapes A1-A4 and D1-D4 were tested and the data are shown in Table 1.
TABLE 1 tensile strength and elongation of tungsten wire
From the above table, the tungsten ribbon a1-a4 manufactured by the round wire to strip pressure processing and annealing process provided by the present invention has significantly improved ductility and toughness (elongation) and less decrease of tensile strength.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A pressure processing and annealing process from round wire to strip is characterized by comprising the following steps:
s1, selecting a tungsten round wire;
s2, rolling the round tungsten wire obtained in the step S1 to enable the round tungsten wire to reach a specified single deformation;
s3, repeating the step S2 to enable the tungsten round wire to reach the specified accumulated deformation;
and S4, performing recovery annealing heat treatment on the tungsten round wire after the specified deformation is achieved.
2. The round wire to strip pressure and annealing process of claim 1, wherein in step S1, the performance parameters of the round tungsten wire comprise:
the tensile strength is 2300MPa to 2400 MPa;
the number of the bending points is 2/10-4/10;
the elongation is 2.0% -3.5%.
3. The round wire to strip pressure and annealing process according to claim 2, wherein the surface of the round tungsten wire is free of cracks and the surface of the round tungsten wire is free of wire grooves.
4. The round wire to strip pressure and annealing process according to claim 1, wherein in step S2, the initial diameter of the tungsten round wire is 0.32mm when rolling.
5. The round wire to strip pressure and annealing process according to claim 1, characterized in that in step S2, the specified single deformation amount is 3% -20%.
6. The round wire to strip pressure and annealing process of claim 1, wherein in step S3, the specified cumulative deformation is not greater than 40%.
7. The round wire to strip pressure working and annealing process according to claim 1, wherein in step S4, the temperature of the recovery annealing heat treatment is 700 ℃ to 1400 ℃, and the time of the recovery annealing heat treatment is 0.5h to 1.5 h.
8. The round wire to strip pressure and annealing process according to claim 7, wherein the temperature of the recovery annealing heat treatment is 1000 ℃ to 1100 ℃ in step S4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111021624.8A CN113941597A (en) | 2021-09-01 | 2021-09-01 | Pressure processing and annealing process from round wire to strip material |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111021624.8A CN113941597A (en) | 2021-09-01 | 2021-09-01 | Pressure processing and annealing process from round wire to strip material |
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| CN113941597A true CN113941597A (en) | 2022-01-18 |
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| CN202111021624.8A Pending CN113941597A (en) | 2021-09-01 | 2021-09-01 | Pressure processing and annealing process from round wire to strip material |
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Citations (6)
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| DE102005031462A1 (en) * | 2005-07-04 | 2007-01-11 | Bilstein Gmbh & Co. Kg | Method for cold rolling steel strip with two rolling processes with staggered heat tempering for producing high tensile material |
| CN101322978A (en) * | 2008-07-22 | 2008-12-17 | 西北有色金属研究院 | Cold machining and molding method of magnesium alloy pipes |
| CN102154599A (en) * | 2011-03-17 | 2011-08-17 | 北京科技大学 | Short-flow high-efficiency production method for white brass alloy pipes |
| CN109023138A (en) * | 2018-09-20 | 2018-12-18 | 苏州翔楼新材料股份有限公司 | A kind of automobile safety belt latching system pressure pipe cold-rolled strip DC04 heat treatment process |
| CN109402719A (en) * | 2018-12-14 | 2019-03-01 | 西安瑞福莱钨钼有限公司 | A kind of preparation method of tungsten narrowband foil |
| CN113102544A (en) * | 2021-03-29 | 2021-07-13 | 江苏兄弟合金有限公司 | Rolling process of high-precision electrothermal alloy flat wire |
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2021
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005031462A1 (en) * | 2005-07-04 | 2007-01-11 | Bilstein Gmbh & Co. Kg | Method for cold rolling steel strip with two rolling processes with staggered heat tempering for producing high tensile material |
| CN101322978A (en) * | 2008-07-22 | 2008-12-17 | 西北有色金属研究院 | Cold machining and molding method of magnesium alloy pipes |
| CN102154599A (en) * | 2011-03-17 | 2011-08-17 | 北京科技大学 | Short-flow high-efficiency production method for white brass alloy pipes |
| CN109023138A (en) * | 2018-09-20 | 2018-12-18 | 苏州翔楼新材料股份有限公司 | A kind of automobile safety belt latching system pressure pipe cold-rolled strip DC04 heat treatment process |
| CN109402719A (en) * | 2018-12-14 | 2019-03-01 | 西安瑞福莱钨钼有限公司 | A kind of preparation method of tungsten narrowband foil |
| CN113102544A (en) * | 2021-03-29 | 2021-07-13 | 江苏兄弟合金有限公司 | Rolling process of high-precision electrothermal alloy flat wire |
Non-Patent Citations (3)
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| 刘宁平;淡新国;张永刚;郭让民;: "轧制工艺对热轧钨板材组织和性能的影响", 稀有金属快报, no. 08, pages 265 * |
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