阅读说明：本技术 多元复合稀土钨合金线材及其轧制工艺和电极 (Multi-element composite rare earth tungsten alloy wire and rolling process and electrode thereof ) 是由 刘山宇 章德铭 侯玉柏 丁舜 彭鹰 王芦燕 张宇晴 李曹兵 于 2021-09-23 设计创作，主要内容包括：本发明提供了一种多元复合稀土钨合金线材及其轧制工艺和电极,涉及难熔金属的加工制造技术领域。多元复合稀土钨合金线材的轧制工艺采用n道次依次进行轧制,所述n为4-8之间的整数；其中,所述n道次中的每道次的轧制压缩比均为2-17%。一种多元复合稀土钨合金线材,根据多元复合稀土钨合金线材的轧制工艺轧制得到。本发明提供的多元复合稀土钨合金线材轧制工艺过程可控性好、生产效率高、减小了劳动强度,线材变形均匀,纤维组织搭接良好,内部组织均匀,密度可达18.9g/cm～(3)。本发明提供的多元复合稀土钨合金线材制成的电极具有熔点高,密度高、抗烧损的特点,还具有良好的导电性。(The invention provides a multi-element composite rare earth tungsten alloy wire, a rolling process thereof and an electrode, and relates to the technical field of processing and manufacturing of refractory metals. The rolling process of the multi-element composite rare earth tungsten alloy wire rod adopts n passes to sequentially roll, wherein n is an integer between 4 and 8; wherein the rolling reduction ratio of each pass in the n passes is 2-17%. The multi-element composite rare earth tungsten alloy wire is obtained by rolling according to the rolling process of the multi-element composite rare earth tungsten alloy wire. The multi-element composite rare earth tungsten alloy wire rod provided by the invention has the advantages of good controllability of the rolling process, high production efficiency, reduced labor intensity, uniform wire rod deformation, good fiber tissue lap joint, uniform internal tissue and density of 18.9g/cm 3 . The electrode made of the multi-element composite rare earth tungsten alloy wire rod provided by the invention has the characteristics of high melting point, high density and burning loss resistance, and also has good conductivity.)

1. The rolling process of the multi-element composite rare earth tungsten alloy wire is characterized in that n passes are adopted for rolling in sequence, wherein n is an integer between 4 and 8;

wherein the rolling reduction ratio of each pass in the n passes is 2-17%.

2. The rolling process of the multi-element composite rare earth tungsten alloy wire rod according to claim 1, wherein the rolling temperature in the n passes is reduced sequentially along the rolling process.

3. The rolling process of the multi-element composite rare earth tungsten alloy wire rod according to claim 1, wherein 8 passes are adopted for rolling, and the rolling process comprises a first pass, a second pass, a third pass, a fourth pass, a fifth pass, a sixth pass, a seventh pass and an eighth pass which are sequentially arranged.

4. The rolling process of the multi-element composite rare earth tungsten alloy wire rod as claimed in claim 3, wherein the rolling temperature of the first pass and the second pass is 1560-1520 ℃.

5. The rolling process of the multi-element composite rare earth tungsten alloy wire rod as claimed in claim 3, further comprising a heating process before the first rolling, wherein the heating temperature is 1600-.

6. The rolling process of the multi-element composite rare earth tungsten alloy wire rod according to claim 3, further comprising an annealing process after the eighth rolling.

7. The rolling process of the multi-element composite rare earth tungsten alloy wire rod according to claim 1, wherein the conveying speed of the multi-element composite rare earth tungsten alloy wire rod is 4-10 m/s.

8. The rolling process of the multi-element composite rare earth tungsten alloy wire according to claim 1, wherein the multi-element composite rare earth tungsten alloy wire is made of a multi-element composite rare earth tungsten alloy.

9. A multi-element composite rare earth tungsten alloy wire rod, which is obtained by rolling according to the rolling process of the multi-element composite rare earth tungsten alloy wire rod of any one of claims 1 to 8.

10. An electrode prepared from the multicomponent composite rare earth tungsten alloy wire of claim 9.

Technical Field

The invention relates to the technical field of processing and manufacturing of refractory metals, in particular to a multi-element composite rare earth tungsten alloy wire and a rolling process and an electrode thereof.

Background

The rare earth tungsten alloy is used as an electrode material and applied to the fields of inert gas shielded welding, plasma welding, laser, cutting and the like. Cogging and swaging are the first process in the processing process of the multi-element composite rare earth tungsten alloy, and the traditional operation method is that workers clamp a tungsten bar by using a long handle clamp, take out the tungsten bar from a molybdenum wire furnace and send the tungsten bar into a high-speed rotary swaging machine to process one half of the tungsten bar, then heat the tungsten bar and swage the other half of the tungsten bar, so that the purpose of reducing the diameter of the whole bar at the same time is achieved, and the rotary hammering and forging are repeated in such a way until the requirement is met. The rotary swaging is a key processing procedure for producing the tungsten wire, and has the following defects:

the labor intensity is high;

the process controllability is poor;

the single deformation is less;

the deformation is not uniform;

the production efficiency is low.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The invention aims to provide a rolling process of a multi-element composite rare earth tungsten alloy wire rod, and aims to solve the technical problems of poor process controllability, high labor intensity, small single deformation, uneven deformation and low production efficiency in the prior art.

The second purpose of the invention is to provide a multi-element composite rare earth tungsten alloy wire rod which has the characteristics of high density and low porosity.

The third purpose of the invention is to provide an electrode which has the characteristics of high melting point, high density and burning loss resistance, and also has good heat conductivity and electrical conductivity.

In order to solve the technical problems, the invention adopts the following technical scheme:

the first aspect of the invention provides a rolling process of a multi-element composite rare earth tungsten alloy wire, which adopts n passes to sequentially roll, wherein n is an integer between 4 and 8.

Wherein the rolling reduction ratio of each pass in the n passes is 2-17%.

Further, the rolling temperature in the n passes is reduced sequentially along with the rolling process.

Preferably, the heating is carried out by a heating furnace before rolling.

Preferably, the heating furnace comprises a furnace tube and a furnace wire.

Further, 8 passes are adopted for rolling, and the rolling comprises a first pass, a second pass, a third pass, a fourth pass, a fifth pass, a sixth pass, a seventh pass and an eighth pass which are sequentially arranged.

Preferably, the rolling reduction ratio of the first pass and the second pass is 13-17%.

Preferably, the rolling reduction ratio of the third pass and the fourth pass is 12-9%.

Preferably, the rolling reduction ratio of the fifth pass and the sixth pass is 9-7%.

Preferably, the rolling reduction ratio of the seventh pass and the eighth pass is 6-2%.

Further, the rolling temperature of the first pass and the second pass is 1560-1520 ℃.

Preferably, the rolling temperature of the third pass and the fourth pass is 1510-1470 ℃.

Preferably, the rolling temperature of the fifth pass and the sixth pass is 1465-.

Preferably, the rolling temperatures of the seventh and eighth passes are 1370-1420 ℃.

Further comprises a heating process before the first rolling, wherein the heating temperature is 1600-1650 ℃, and the temperature is kept for 30-50 min.

Preferably, the method further comprises a heating process after the fourth pass rolling is finished and before the fifth pass rolling is started, wherein the heating temperature is 1480-.

Preferably, the method further comprises a heating process after the sixth rolling and before the seventh rolling, wherein the heating temperature is 1430-1460 ℃.

Further, the method also comprises an annealing process after the eighth rolling.

Preferably, the annealing temperature is 1350-.

Further, the conveying speed of the multi-element composite rare earth tungsten alloy wire is 4-10 m/s.

Further, the multi-element composite rare earth tungsten alloy wire is made of multi-element composite rare earth tungsten alloy.

The multi-element composite rare earth tungsten alloy comprises rare earth oxide.

Preferably, the content of the rare earth oxide is less than or equal to 2wt%, and the balance is tungsten.

Preferably, the rare earth oxide comprises at least one of lanthanum oxide, yttrium oxide, cerium oxide or zirconium oxide.

The second aspect of the invention provides a multi-element composite rare earth tungsten alloy wire rod which is obtained by rolling the multi-element composite rare earth tungsten alloy wire rod of the first aspect through a rolling process.

The third aspect of the invention provides an electrode prepared from the multi-element composite rare earth tungsten alloy wire rod of the second aspect.

Compared with the prior art, the invention has the following beneficial effects:

1. the multi-element composite rare earth tungsten alloy wire rolling process provided by the invention adopts multiple rolling passes, and each rolling pass adopts a specific compression ratio, so that the rare earth elements and the tungsten elements in the wire are ensured to be deformed synchronously, and an integral fiber structure is formed. The multi-element composite rare earth tungsten alloy wire rod provided by the invention has good controllability in the rolling process, reduces the labor intensity, and has uniform deformation which can reach 74%.

2. The multi-element composite rare earth tungsten alloy wire provided by the invention has no cracks in rolling, the rare earth element and the matrix tungsten material fiber tissue are well lapped, the internal tissue is uniform, the density is high, and the density can reach 18.9g/cm³。

3. The electrode provided by the invention has the characteristics of high melting point, high density and burning loss resistance, and also has good thermal conductivity and electrical conductivity.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a metallographic image before rolling according to example 1 of the present invention, in which fig. 1 (a) is a metallographic image of a surface layer region before rolling and fig. 1 (b) is a metallographic image of a core region before rolling;

fig. 2 is a metallographic image after rolling according to example 1 of the present invention, in which fig. 2 (a) is a metallographic image of a surface layer region after rolling, and fig. 2 (b) is a metallographic image of a core region after rolling;

fig. 3 is a gold phase diagram provided in comparative example 1 of the present invention, in which (a) in fig. 3 is a gold phase diagram of a surface region after swaging, and (b) in fig. 3 is a gold phase diagram of a core region after swaging.

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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

At present, cogging and rotary swaging are the first process in the processing process of the multi-element composite rare earth tungsten alloy, are key processes of tungsten alloy product quality, production efficiency and energy consumption, and are also the process with the highest temperature. Processing a batch (12 kg) in 1 hour produces 2% waste, the most intensive process, and energy consumption of 40% of the overall processing line. The specific operation is as follows: firstly, heating a tungsten bar to more than 1500 ℃ by using a 10-hole molybdenum wire furnace, clamping the tungsten bar by using a long handle clamp by a worker, taking out the tungsten bar from the molybdenum wire furnace, feeding the tungsten bar into a high-speed rotary swaging machine to machine one half of a tungsten rod, then heating the tungsten bar, and then swaging the other half of the tungsten rod to achieve the purpose of reducing the diameter of the whole bar simultaneously, and repeatedly performing rotary hammer forging in such a way, wherein the tungsten bar is heated frequently to cause serious heat waste, and each processing pass has limited processing time and large energy consumption; all manual operations are performed in the processing process, so that the efficiency is low and the number of human influence factors is large.

According to the rolling process of the multi-element composite rare earth tungsten alloy wire rod provided by the first aspect of the invention, n passes are adopted for rolling in sequence, wherein n is an integer between 4 and 8;

wherein the rolling reduction ratio of each pass in the n passes is 2-17%.

According to the rolling process of the multi-element composite rare earth tungsten alloy wire rod, pure tungsten and rare earth elements exist in the multi-element composite rare earth tungsten alloy in the processing process, synchronous coordinated deformation is needed, the temperature of the bar material at the initial processing stage is high due to the fact that the rare earth elements are the second phase in the grain boundary of the tungsten, the rare earth elements are easy to deform, an integral fiber structure is formed, subsequent processing is facilitated, and once the temperature is reduced, the rare earth elements break, and crack sources of later-stage processing can be formed. By adopting a specific rolling compression ratio, no crack is generated in the rolling process, the rare earth element and the matrix tungsten alloy fiber structure are well lapped, the product quality is good, and the later use and processing are facilitated. The multi-element composite rare earth tungsten alloy wire rod provided by the invention has good controllability in the rolling process, reduces the labor intensity, and has uniform deformation which can reach 74%.

Rolling is a metal working process in which a multi-element composite rare earth tungsten alloy billet is passed through a gap (various shapes) between a pair of rotating rolls, and the material is compressed by the rolls to reduce the cross section and increase the length of the material. The rolling process refers to the mechanical process of deformation of the multi-element composite rare earth tungsten alloy wire between rollers.

The multi-element composite rare earth tungsten alloy wire is rolled for one pass once, is rolled for 2 passes once, and so on, and is rolled for n passes through n times.

The rolling compression ratio refers to the ratio of the diameter of the multi-element composite rare earth tungsten alloy wire before rolling to the diameter after rolling. In order to improve the productivity of the rolling mill, reduce the deformation nonuniformity and obtain the multi-element composite rare earth tungsten alloy wire rod with a more uniform structure, the pass compression ratio is increased, but the alloy temperature is reduced along with the increase of the pass, the deformation resistance is increased, and therefore, the pass compression ratio is reduced in the subsequent pass. In a preferred embodiment of the invention, the rolling reduction is typically, but not limited to, 17%, 12%, 8%, 4% or 2%.

Further, the rolling temperature in the n passes is reduced sequentially along with the rolling process.

Preferably, the heating is carried out by a heating furnace before rolling.

Preferably, the heating furnace comprises a furnace tube and a furnace wire.

In the rolling process, because the heat dissipation and the rolling mill absorb the heat of the multi-element composite rare earth tungsten alloy wire, the rolling temperature is reduced along with the rolling process, the plasticity of the multi-element composite rare earth tungsten alloy wire is reduced, and the rolling compression ratio is also reduced in sequence. The temperature of the multi-element composite rare earth tungsten alloy wire is reduced, and brittle fracture is easy to occur during rolling at the moment, so that the rolling effect is influenced.

The low rolling temperature can enable the multi-element composite rare earth tungsten alloy wire to generate larger deformation resistance, internal fine cracks can be formed by large deformation, cracks are connected in subsequent rolling and are broken, and tungsten crystal grains in the multi-element composite rare earth tungsten alloy wire tend to deform along the rolling direction at low temperature, so that when the temperature is far lower than the recrystallization temperature, crystal cells are elongated into strips, serious anisotropy is formed, the processing performance of products is reduced, and the use of the products is influenced.

In order to ensure the smooth rolling process and prevent cracks from appearing in the rolling process, the multi-element composite rare earth tungsten alloy wire rod needs to be heated in a melting furnace in the rolling process, so that the machinability of the multi-element composite rare earth tungsten alloy wire rod is kept. In the rolling process, if the temperature of the wire rod is reduced too much and is not in the temperature range of the next pass of rolling, the wire rod needs to be heated; if the temperature of the wire rod is in the rolling temperature range of the next pass, the wire rod is directly subjected to the rolling process of the next pass without heating.

According to the characteristics of the multi-element composite rare earth tungsten alloy wire, the temperature of the wire is improved by heating the wire in a furnace tube manner, and the heating efficiency is improved by heating the furnace tube.

Further, 8 passes are adopted for rolling, and the rolling comprises a first pass, a second pass, a third pass, a fourth pass, a fifth pass, a sixth pass, a seventh pass and an eighth pass which are sequentially arranged.

Preferably, the rolling reduction ratio of the first pass and the second pass is 13-17%.

Preferably, the rolling reduction ratio of the third pass and the fourth pass is 12-9%.

Preferably, the rolling reduction ratio of the fifth pass and the sixth pass is 9-7%.

Preferably, the rolling reduction ratio of the seventh pass and the eighth pass is 6-2%.

The invention uses advanced two-roller rolling technology, 8-pass two-roller horizontally and vertically rolls the multi-element composite rare earth tungsten alloy wire, each pass rack roller of the two-roller horizontally and vertically rolling mill is driven by different variable frequency motors, and simultaneously, the roll pass and the rotating speed of each pass rack are changed, thereby achieving the synchronization of each pass rack.

The processing roller can also change the hole pattern, the two-roller flat vertical rolling mill can roll the multielement composite rare earth tungsten alloy wire rods with different sizes, and the rolling mill has higher work efficiency than similar products. During processing, firstly, the multi-element composite rare earth tungsten alloy wire is heated to a required temperature, and then the multi-element composite rare earth tungsten alloy wire is sent into a rolling mill for primary rolling. As the rare earth element is doped in the multi-element composite rare earth tungsten alloy, and the rare earth element exists in the form of a second phase at the grain boundary between tungsten grains in the tungsten alloy rod, cracks are easily generated when the deformation is too large due to too large stress in the process of processing deformation, and the multi-element composite rare earth tungsten alloy wire is broken. In a preferred embodiment of the invention, the rolling of the multi-element composite rare earth tungsten alloy wire is carried out by designing the rolling compression ratio of 8 rollers with the pores suitable for the multi-element composite rare earth tungsten alloy wire.

The time between two passes can be reduced by adopting one fire for two passes, the temperature of the wire can be ensured, the plasticity of the wire is improved, and the fiber tissue is finer and more uniform. In the rolling process, the low temperature of the multi-element composite rare earth tungsten alloy wire can cause rolling fracture; high temperatures result in sticking of the rolls. The deformation amount exceeds 17 percent, and the coordination deformability between the rare earth and the tungsten alloy in the multi-element composite rare earth tungsten alloy wire is poor, so that the multi-element composite rare earth tungsten alloy wire is broken; the deformation is less than 2%, and the core and the edge can not be deformed synchronously.

Further, the rolling temperature of the first pass and the second pass is 1560-1520 ℃.

Preferably, the rolling temperature of the third pass and the fourth pass is 1510-1470 ℃.

Preferably, the rolling temperature of the fifth pass and the sixth pass is 1465-.

Preferably, the rolling temperatures of the seventh and eighth passes are 1370-1420 ℃.

Further comprises a heating process before the first rolling, wherein the heating temperature is 1600-1650 ℃, and the temperature is kept for 30-50 min.

Preferably, the method further comprises a heating process after the fourth pass rolling is finished and before the fifth pass rolling is started, wherein the heating temperature is 1480-.

Preferably, the method further comprises a heating process after the sixth rolling and before the seventh rolling, wherein the heating temperature is 1430-1460 ℃.

The plastic temperature area of the multi-element composite rare earth tungsten alloy wire is narrow. If the initial rolling temperature is too low, the deformation resistance of the multi-element composite rare earth tungsten alloy is very high, so that the rolled piece cannot be plastically deformed due to the too high deformation resistance, and the rolling mill and equipment are damaged. The initial rolling temperature is too high, so that the multi-element composite rare earth tungsten alloy is recrystallized to cause crystal grains to grow, and the rolled piece becomes waste. The plasticity of the multi-element composite rare earth tungsten alloy is not obviously changed before 1200 ℃, and the plasticity is obviously improved when the temperature exceeds 1400 ℃, so that in some preferred embodiments of the invention, the heating temperature before the first rolling is 1600-1650 ℃, and the heating temperature is typically but not limited to 1600 ℃, 1610 ℃, 1630 ℃ or 1650 ℃. The heat preservation after heating is to ensure that the internal temperature of a rolled piece is also within the rolling temperature range, and prevent the multi-element composite rare earth tungsten alloy wire from cracking in rolling caused by uneven heating. The incubation time is typically, but not limited to, 30min, 40min or 50 min.

Further, the method also comprises an annealing process after the eighth rolling.

Preferably, the annealing temperature is 1350-.

Annealing is a heat treatment process of multi-element composite rare earth tungsten alloy, which means that a multi-element composite rare earth tungsten alloy wire is slowly heated to a certain temperature, kept for a sufficient time and then cooled at a proper speed. The purpose is to reduce hardness and improve machinability; the residual stress is reduced, the size is stabilized, and the deformation and crack tendency is reduced; refining grains, adjusting the structure and eliminating the structure defects.

Because the multi-element composite rare earth tungsten alloy has certain work hardening and residual stress in the processing process, the homogenizing annealing temperature is increased as much as possible. According to the wire diameters of different multi-component composite rare earth tungsten alloys, the recrystallization starting temperature of the multi-component composite rare earth tungsten alloy is 1150-plus-1300 ℃, the recrystallization finishing temperature is 1400-plus-1600 ℃, and because a small amount of recrystallization is beneficial to improving the plasticity of the multi-component composite rare earth tungsten alloy, the adopted annealing temperature is 1350-plus-1450 ℃, and the temperature is kept for 3-10 min. In the rolling process, the multi-element composite rare earth tungsten alloy generates internal stress through each pass of rolling, if the multi-element composite rare earth tungsten alloy is not annealed, the internal stress is gradually increased, and cracks are generated after the internal stress exceeds the stress limit, so that the rolling process finally comprises an annealing process, the internal stress in the rolling process is eliminated, and the generation of defects is avoided.

In a preferred embodiment of the invention, the annealing temperature is typically, but not limited to, 1350 ℃, 1400 ℃ or 1450 ℃; the annealing time is typically, but not limited to, 3min, 6min or 10 min.

Further, the conveying speed of the multi-element composite rare earth tungsten alloy wire is 4-10 m/s.

The conveying speed of the multi-element composite rare earth tungsten alloy wire has direct influence on the productivity and the finish rolling temperature, and if the conveying speed is too low, the temperature drop of the multi-element composite rare earth tungsten alloy wire is increased, and the productivity is low. The conveying speed also indirectly influences the deformation speed, thereby influencing the softening and hardening processes of the multi-element composite rare earth tungsten alloy wire, and leading the plasticity to change. Generally, the conveying speed of the multi-element composite rare earth tungsten alloy wire is improved, so that the rolling is facilitated. However, when the first rolling is started, in order to improve the biting condition, the conveying speed of the multi-element composite rare earth tungsten alloy wire rod can be reduced, and the conveying speed can be increased along with the diameter reduction of the multi-element composite rare earth tungsten alloy wire rod. In some preferred embodiments of the invention, the multi-element composite rare earth tungsten alloy wire is typically, but not limited to, 4m/s, 7m/s or 10 m/s.

Further, the multi-element composite rare earth tungsten alloy wire is made of multi-element composite rare earth tungsten alloy.

The multi-element composite rare earth tungsten alloy comprises rare earth oxide.

Preferably, the content of the rare earth oxide is less than or equal to 2wt%, and the balance is tungsten.

Preferably, the rare earth oxide comprises at least one of lanthanum oxide, yttrium oxide, cerium oxide or zirconium oxide.

According to the second aspect of the present invention, the multi-element composite rare earth tungsten alloy wire rod is obtained by rolling the multi-element composite rare earth tungsten alloy wire rod of the first aspect.

The multi-element composite rare earth tungsten alloy wire provided by the invention has the advantages of uniform structure, high density and high density.

The third aspect of the invention provides an electrode prepared from the multi-element composite rare earth tungsten alloy wire rod of the second aspect.

The electrode provided by the invention has the characteristics of high melting point, high density and burning loss resistance, and also has good thermal conductivity and electrical conductivity.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict. The multi-element composite rare earth tungsten alloy wire used in the following examples is a multi-element rare earth tungsten alloy bar produced by Jiangsu North tungsten New Material science and technology company, and the diameter of the bar is15.5mm, and the molar ratio of the doped rare earth oxide in the multielement rare earth bar is La₂O₃：Y₂O₃：CeO₂And (4) the total designed mass fraction of the rare earth oxide is 2wt percent in a ratio of 1:3: 1.

Example 1

The embodiment provides a multi-element composite rare earth tungsten alloy wire, which is characterized in that in the tungsten alloy rolling process, a tungsten alloy bar with the diameter of phi 15.5mm is firstly placed into a heating furnace to be heated to 1600 ℃, and then is sent into a rolling mill to be rolled; the total deformation amount is 74% from phi 15.5mm rolling to phi 8.0mm rolling, the diameters of the totally-divided 8 compression passes are 14.29-12.96-12.09-10.96-9.03-8.3-8.63-8.0 in sequence, the compression ratio of each pass is 15%, 10%, 8%, 5% and 3%, the processing temperature of each pass is 1550 ℃, 1530 ℃, 1500 ℃, 1480 ℃, 1460 ℃, 1440 ℃, 1400 ℃, 1380 ℃ and the overall processing speed is 10 m/s. Annealing treatment is carried out after rolling, and the specific annealing temperature is as follows: 1400 ℃; the annealing time was 5 min.

Example 2

The embodiment provides a multi-element composite rare earth tungsten alloy wire, which is different from embodiment 1 in that the wire is rolled in 4 passes, the diameter of each pass of the reduction pass is 12.87-10.68-9.29-8.08 in sequence, the reduction ratio of each pass is 17%, 13% and 13%, the processing temperature of each pass is 1550 ℃, 1530 ℃, 1500 ℃ and 1480 ℃, and other steps are the same as embodiment 1, and are not described again.

Example 3

The embodiment provides a multi-element composite rare earth tungsten alloy wire, which is different from the embodiment 1 in that the diameters of 10 compression pass groups which are divided in total are 13.95-12.56-11.55-10.63-9.99-9.49-9.10-8.83, the compression ratios of each pass are respectively 10%, 8%, 6%, 5%, 4% and 3%, the processing temperature of each pass is 1550 ℃, 1530 ℃, 1480 ℃, 1460 ℃, 1440 ℃, 1400 ℃, 1380 ℃, 1360 ℃ and 1340 ℃, and other steps are the same as the embodiment 1, and are not repeated herein.

Example 4

The embodiment provides a multi-element composite rare earth tungsten alloy wire, which is different from embodiment 1 in that the diameters of 8 compression pass groups which are divided in total are 15.04-14.28-13.14-12.09-10.88-9.79-8.32-7.07, the compression ratios of each pass are respectively 3%, 5%, 8%, 10%, 15% and 15%, and other steps are the same as embodiment 1, and are not repeated herein.

Comparative example 1

The comparative example provides a multi-element composite rare earth tungsten alloy wire rod obtained by rotary forging, the multi-element rare earth tungsten alloy wire rod is processed to be 8.0mm from 15.5mm, the cogging temperature is 1600 ℃, rotary forging is carried out after heat preservation is carried out for 25min, workers clamp the wire rod by long-handled pliers and send the wire rod into a high-speed rotary forging machine to process one end of the multi-element rare earth tungsten alloy wire rod, then the other end of the multi-element rare earth tungsten alloy wire rod is processed, the diameter of the whole bar rod is reduced simultaneously, 9 dies are needed after processing, each die is processed for 2 times, the processing is carried out for 18 times in total, and rotary hammer forging is repeated in this way, so that the multi-element composite rare earth tungsten alloy wire rod after rotary forging is obtained.

Comparative example 2

The comparative example provides a multi-element composite rare earth tungsten alloy wire, which is different from the embodiment 1 in that 1 pass of rolling is carried out in a total way, the diameter of a compression pass is 12.87, the pass reduction ratio is 17%, the processing temperature is 1550 ℃, and other steps are the same as those in the embodiment 1 and are not repeated herein.

Comparative example 3

The comparative example provides a multi-element composite rare earth tungsten alloy wire, which is different from the embodiment 1 in that the wire is rolled in 2 passes, the diameter of a compression pass is 12.87-10.81, the pass reduction ratio is 17% and 16%, and other steps are the same as those in the embodiment 1 and are not repeated.

Test example 1

The multi-element composite rare earth tungsten alloy wires obtained in examples 1 to 4 and comparative examples 1 to 3 were subjected to density and porosity measurement, and the obtained data are shown in table 1 below.

TABLE 1 Performance data sheet of multicomponent composite rare earth tungsten alloy wire

Test example 2

The multi-element composite rare earth tungsten alloy wires obtained in example 1 and comparative example 1 are photographed with a gold phase diagram of a surface layer region and a central region, fig. 1 is the gold phase diagram before rolling provided by example 1 of the present invention, fig. 1 (a) is the gold phase diagram of the surface layer region before rolling, and fig. 1 (b) is the gold phase diagram of a core region before rolling; fig. 2 is a metallographic image after rolling according to example 1 of the present invention, in which fig. 2 (a) is a metallographic image of a surface layer region after rolling, and fig. 2 (b) is a metallographic image of a core region after rolling; fig. 3 is a gold phase diagram provided in comparative example 1 of the present invention, in which (a) in fig. 3 is a gold phase diagram of a surface region after swaging, and (b) in fig. 3 is a gold phase diagram of a core region after swaging.

The crystal grains before rolling are in an equiaxial shape, the crystal grain boundaries are clear, the second phase is mainly distributed at the crystal grain boundaries, and the crystal grains are uniform in size. The rotary forging cogging grains extend in the radial direction, and compared with the grains before rolling, the grains grow violently, the grain sizes of the surface region and the core region are different, the grain size of the surface region is smaller than that of the core region, and the structural nonuniformity is obvious. After rolling, the crystal grains are elongated in the rolling direction, and the processed structure in which the crystal grains are mutually extruded and overlapped has a high degree of fibrosis. The surface and core regions have uniform grain sizes smaller than the size of the swaged grains.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.