Bending correction process for rhenium alloy plate

Abstract

The invention provides a bend correction process for a rhenium alloy plate. According to the bend correcting process, a deformed rhenium alloy plate is subjected to grinding and polishing or cleaning treatment and then placed on a lower bottom plate of a tool clamp, one end of the plate is fixed to the lower bottom plate and assembled with an upper top plate on a cover, pressing force is applied, the tool clamp is installed on a base of electron beam melting equipment, and circulating cooling water is started; and after the vacuum is lower than 10 <-3 > Pa, preheating treatment and bending correction treatment are conducted on the rhenium alloy plate through an electron beam d, the plate is taken out and rotated by 90 degrees, polishing treatment is conducted on the rhenium alloy plate through the electron beam d after the steps are repeated, and the straight rhenium alloy plate can be obtained. The bend correction process meets the urgent requirements for the bend correction process and method of the rhenium alloy plate in academic research and application production, a good connection effect is achieved on the front-section procedure of rhenium alloy, the quality problem is solved, cost is greatly saved, and meanwhile a good machining basis is provided for subsequent machining.

Description

Technical Field

[0001] The invention relates to the field of bending correction technology and processing technology of rhenium alloy plates, and in particular provides a bending correction technology for rhenium alloy plates. Background Art

[0002] Rare metal rhenium is one of the rarest elements in the earth's crust, with an average content estimated at one part per billion. It is a byproduct of the refining process of molybdenum and copper. The price of single rhenium products is expensive, and rhenium-containing alloys are mostly used in applications. Among them, tungsten-rhenium, molybdenum-rhenium, and nickel-rhenium alloys are the most widely used. The rhenium content in the first two alloys is usually not more than 50%, while the nickel-rhenium alloy contains up to 6% rhenium. Among them, tungsten-rhenium alloys and molybdenum-rhenium alloys made by adding an appropriate amount of rhenium to tungsten and molybdenum not only have good plasticity and can be processed into various structural materials, but also have the characteristics of high hardness, high strength and high temperature resistance. Molybdenum-rhenium alloys are often used to manufacture space reactor core heating tubes, high-temperature furnace heating elements, and high-temperature thermocouples. Tungsten-rhenium alloys are widely used in the manufacture of special electron tubes and filaments, high-temperature components, thermocouples, etc. for color picture tubes. Rhenium nickel alloy is the core material for important structural parts such as modern jet engine blades and turbine disks. The use of rhenium can not only improve the creep properties of nickel-based high-temperature alloys, but can also be used to manufacture single crystal blades for aircraft engines and improve work efficiency.

[0003] Rhenium alloy is a refractory alloy, and its preparation methods usually adopt vacuum melting method and powder metallurgy method, and the two methods have their own characteristics. Among them, the rhenium alloy ingot prepared by vacuum melting method can well control and reduce the impurity content, and the intermediate phase is not easy to precipitate, which is beneficial to the subsequent processing of rhenium alloy. However, the grains of rhenium alloy ingots prepared by this method are usually coarse, and the size distribution is uneven, and the material is prone to cracking when opening. The process of preparing rhenium alloy by powder metallurgy is relatively simple, low cost, and relatively easy to industrialize. Therefore, most rhenium alloy materials are currently produced by powder metallurgy, but powder metallurgy is not easy to control the impurity content in the alloy ingot.

[0004] After the billet is prepared by the powder metallurgy method, the subsequent processing of the rhenium alloy usually includes forging, hot rolling, cold rolling and heat treatment. As an additive element, the addition of rhenium can increase the recrystallization temperature of the alloy, reduce the tough-brittle transition temperature of the alloy, and greatly improve the strength and plasticity of the alloy. However, when the rhenium content in the rhenium alloy is high or the rhenium composition is uneven or segregation occurs, a large amount of hard and brittle σ phase will be produced during the production process, which may cause the rhenium alloy sheet to bend or crack. Secondly, the rhenium alloy has a high melting point and recrystallization, and a large deformation resistance. When rolling, a high temperature zone with good plasticity and low deformation resistance is generally selected for hot rolling, but too high a hot rolling temperature will also lead to high-temperature oxidation and prevent grain growth. Problems. As the rolling temperature decreases, the plasticity decreases, so bending or cracking is prone to occur during the rolling process when the temperature is too low. In addition, the grain refinement caused by deformation will produce a large organizational stress, and the plate may naturally bend and deform after rolling.

[0005] For the above problems, there is currently no effective correction method for rhenium alloy plates. Direct use will lead to quality problems, and it will be a huge waste as scrap, which will increase costs and make it difficult to make a decision. Electron beam melting technology has the advantages of extremely high power, density, fast welding speed, deep penetration, short exhaust time, narrow welding area, and heat-affected zone. It can effectively reduce the oxygen content and low-melting point impurity content in the alloy and improve the microstructure of the alloy. It is a very promising technology for the correction and bending of rhenium alloy plates. At present, scholars are also looking for an effective correction and bending process and method for rhenium alloy plates. However, according to existing patents, there is currently no reference to a correction and bending process and method for rhenium alloy plates. Summary of the invention

[0006] In view of the deficiencies in the prior art and the urgent needs of the academic community, the present invention provides a bending correction process and method for rhenium alloy plates which has strong practicality, wide applicability and excellent technical effects.

[0007] The present invention adopts the following technical solution: a bending correction process for rhenium alloy plates, the bending correction process comprising the following steps:

[0008] S1) pre-treating the bent rhenium alloy sheet to be processed;

[0009] S2) placing the rhenium alloy plate treated in S1) on a fixture and applying a pressing force;

[0010] S3) installing the fixture equipped with the rhenium alloy plate in S2) on the base of the electron beam melting equipment, starting the circulating cooling water and performing vacuum treatment;

[0011] S4) performing electron beam scanning preheating treatment on the bent rhenium alloy plate treated in S3);

[0012] S5) performing electron beam bending processing on the plate after the preheating treatment in S4);

[0013] S6) taking out the plate after the bending process in S5), rotating it 90°, and repeating S2) to S5);

[0014] S7) performing electron beam polishing on the plate treated in S6).

[0015] Furthermore, the rhenium alloy plate in S1) is a molybdenum-rhenium alloy or a tungsten-rhenium alloy, and the mass fraction of the rhenium element is 1% to 50%;

[0016] The pretreatment includes grinding, polishing or cleaning.

[0017] Further, the fixture in S2) comprises: a lower bottom plate and an upper top plate;

[0018] The upper top plate is provided with through holes for electron beam processing, and the lower bottom plate is provided with bolts and threaded holes for fixing;

[0019] When in use, one end of the rhenium alloy plate is fixed to the lower bottom plate, and the other end is not fixed. The fixing method is electron beam spot welding or fixing with bolts and gaskets, and then the upper top plate is assembled.

[0020] Furthermore, the lower base plate and the upper top plate are made of structural steel or stainless steel.

[0021] Further, the temperature of the circulating cooling water in S3) is not greater than 60° C. under electron beam processing;

[0022] The vacuum degree of the equipment after vacuum treatment is not greater than 10 -3 Pa.

[0023] Furthermore, during the electron beam scanning preheating process in S4), the electron beam power is 1-2 kW, the beam spot diameter is 12-20 mm, the moving speed is 12-24 mm / s, and the scanning interval is 6-16 mm.

[0024] Furthermore, during the electron beam bending process in S5), the electron beam power is 2-5 kW, the beam spot diameter is 0.6-5 mm, the moving speed is 5-15 mm / s, and the scanning interval is 0.3-4 mm.

[0025] Furthermore, the bending deformation of the plate taken out in S6) has been eliminated by more than 85% before being rotated 90°.

[0026] Furthermore, in the electron beam polishing process in S7), the electron beam power is 1.5-3 kW, the beam spot diameter is 5-12 mm, the moving speed is 10-20 mm / s, and the scanning interval is 2.5-8 mm.

[0027] Using electron beam melting technology to process the rhenium alloy rolled plate, on the one hand, the alloy structure can be remelted, which can effectively reduce the original oxygen content and low melting point impurity content in the plate, and can effectively reduce or eliminate the hard and brittle σ phase caused by uneven rhenium composition or segregation during the production process, so as to improve the structural properties of the alloy plate; on the other hand, through electron beam preheating and processing, the bending or cracking problems caused by the rhenium alloy rolling process can be improved, and the integrity of the plate can be improved. In addition, polishing the surface of the processed rhenium alloy plate can optimize the surface roughness and finish of the plate.

[0028] The beneficial effects of the present invention are as follows: due to the adoption of the above technical solution, the blank of the bending process and method for rhenium alloy plates is met, the urgent demand for the bending process and method for rhenium alloy plates in academic research and application production is met, and the front-end process of rhenium alloy is well connected, which not only solves the quality problem, but also greatly saves the cost, and provides a good processing foundation for subsequent processing. The method can be directly used as a processing procedure in the production of rhenium alloy plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the bending correction process and method for rhenium alloy plate of the present invention;

[0030] Figure 2 Macroscopic morphology of the deformed and bent molybdenum-rhenium alloy plate in Example 1;

[0031] Figure 3 Macroscopic morphology of the molybdenum-rhenium alloy plate after electron beam bending processing in Example 1;

[0032] Figure 4 Macroscopic morphology of the molybdenum-rhenium alloy plate after electron beam polishing in Example 1.

[0033] In the figure:

[0034] a. Rhenium alloy plate, b. Lower base plate, c. Upper top plate, d. Electron beam. DETAILED DESCRIPTION

[0035] The present invention is explained in detail below in conjunction with a number of specific embodiments. A schematic diagram of a process and method for correcting the bending of a rhenium alloy sheet is shown in FIG. Figure 1 shown.

[0036] like Figure 1 As shown, the present invention provides a bending correction process for a rhenium alloy plate, and the bending correction process specifically comprises the following steps:

[0037] (1) Grinding, polishing or cleaning the bent rhenium alloy plate a to be processed to reduce the impact of impurities on the equipment;

[0038] (2) placing the treated rhenium alloy plate obtained in step (1) on the lower bottom plate b of the fixture, fixing one end of the plate to the lower bottom plate, and assembling it with the upper top plate c on the cover, and applying a pressing force;

[0039] (3) installing the fixture equipped with the rhenium alloy plate in step (2) on the base of the electron beam melting equipment, starting the circulating cooling water and performing vacuum treatment;

[0040] (4) performing scanning preheating treatment on the bent rhenium alloy plate of step (3) using an electron beam d;

[0041] (5) performing electron beam bending processing on the plate after the preheating treatment in step (4);

[0042] (6) Take out the plate after the bending process in step (5), rotate it 90 degrees, and repeat steps (2) to (5);

[0043] (7) The plate treated in step (6) is subjected to electron beam polishing.

[0044] As the preferred technical solution:

[0045] The rhenium alloy plate material described in step (1) includes alloys such as molybdenum-rhenium and tungsten-rhenium, and the mass fraction of the rhenium element is 1% to 50%.

[0046] The lower base plate and the upper top plate of the fixture in step (2) are made of structural steel or stainless steel. The upper base plate is provided with through holes for electron beam processing, and the upper and lower base plates are provided with bolts and threaded holes.

[0047] One end of the rhenium alloy plate described in step (2) is fixed to the lower base plate, and the other end is not fixed, and the fixing method is electron beam spot welding or fixing with bolts and gaskets.

[0048] The temperature of the circulating cooling water described in step (3) is not greater than 60° C. under electron beam processing.

[0049] The vacuum degree of the equipment after the vacuum treatment in step (3) is not greater than 10 -3 Pa.

[0050] During the electron beam scanning preheating process described in step (4), the electron beam power is 1-2 kW, the beam spot diameter is 12-20 mm, the moving speed is 12-24 mm / s, and the scanning interval is 6-16 mm.

[0051] During the electron beam bending process described in step (5), the electron beam power is 2-5 kW, the beam spot diameter is 0.6-5 mm, the moving speed is 5-15 mm / s, and the scanning interval is 0.3-4 mm.

[0052] The bending deformation of the plate taken out in step (6) has been eliminated by more than 85% before being rotated 90°.

[0053] During the electron beam polishing process described in step (7), the electron beam power is 1.5 to 3 kW, the beam spot diameter is 5 to 12 mm, the moving speed is 10 to 20 mm / s, and the scanning interval is 2.5 to 8 mm.

[0054] Example 1

[0055] This embodiment specifically includes the following steps:

[0056] (1) Treat the processed Mo-44.5Re molybdenum-rhenium alloy sheet (such as Figure 2 The surface of the equipment is cleaned to reduce the impact of impurities on the equipment;

[0057] (2) placing the processed molybdenum-rhenium alloy plate of step (1) on the lower bottom plate of a 45# steel fixture, fixing the relatively straight left end of the plate to the lower bottom plate with bolts, and not fixing the right end so that the plate can be straightened after processing, and assembling it with the upper top plate on the cover, and turning the bolts to apply a clamping force;

[0058] (3) Install the fixture equipped with the molybdenum-rhenium alloy plate in step (2) on the base of the electron beam melting equipment, start the circulating cooling water and control the water temperature below 60°C, and at the same time, evacuate the equipment to 10 -3 Below Pa;

[0059] (4) The bent molybdenum-rhenium alloy plate of step (3) is subjected to electron beam scanning preheating treatment, with an electron beam power of 1.2 kW, a beam spot diameter of 15 mm, a moving rate of 16 mm / s, and a scanning interval of 8 mm.

[0060] (5) The plate preheated in step (4) is subjected to electron beam bending processing, with an electron beam power of 3 kW, a beam spot diameter of 2 mm, a moving speed of 9 mm / s, and a scanning interval of 1 mm.

[0061] (6) Take out the plate after the bending process in step (5), such as Figure 3 As shown, the bending deformation has been eliminated by about 95%. The plate is rotated 90° to the right and steps (2) to (5) are repeated.

[0062] (7) The plate treated in step (6) is subjected to electron beam polishing processing, wherein the electron beam power is 2 kW, the beam spot diameter is 8 mm, the moving speed is 15 mm / s, and the scanning interval is 4 mm. After the polishing processing, the molybdenum-rhenium alloy plate is subjected to bending correction processing, such as Figure 4 As shown, the plane of the bent molybdenum-rhenium plate is flat as a whole after being calibrated.

[0063] Example 2

[0064] This embodiment specifically includes the following steps:

[0065] (1) Use an angle grinder to grind the surface of the bent tungsten-rhenium (W-3Re) alloy plate to be processed, and clean it with acetone and anhydrous ethanol to reduce the impact of surface oil on the equipment;

[0066] (2) placing the processed tungsten-rhenium alloy plate of step (1) on the lower bottom plate of the stainless steel fixture, fixing the relatively straight right end of the plate to the lower bottom plate with bolts, and not fixing the left end so that the plate can be straightened after processing, and assembling it with the upper top plate on the cover, and turning the bolts to apply a clamping force;

[0067] (3) Install the fixture equipped with the tungsten-rhenium alloy plate in step (2) on the base of the electron beam melting equipment, start the circulating cooling water and control the water temperature below 60°C, and at the same time, evacuate the equipment to 10 -3 Below Pa;

[0068] (4) The bent tungsten-rhenium alloy plate of step (3) is subjected to electron beam scanning preheating treatment, with an electron beam power of 1.5 kW, a beam spot diameter of 18 mm, a moving speed of 18 mm / s, and a scanning interval of 9 mm.

[0069] (5) The plate preheated in step (4) is subjected to electron beam bending processing, with an electron beam power of 2.5 kW, a beam spot diameter of 2 mm, a moving speed of 15 mm / s, and a scanning interval of 1 mm.

[0070] (6) Take out the plate after the bending correction processing in step (5), whose bending deformation has been eliminated by about 90%, rotate the plate 90° to the right, and repeat steps (2) to (5);

[0071] (7) The plate treated in step (6) is subjected to electron beam polishing processing, wherein the electron beam power is 1.5 kW, the beam spot diameter is 6 mm, the moving speed is 16 mm / s, and the scanning interval is 3 mm. After the polishing processing, a straight tungsten-rhenium alloy plate is obtained after the bending correction.

[0072] The above is a detailed introduction to a bending correction process for rhenium alloy plates provided in the embodiment of the present application. The description of the above embodiment is only used to help understand the method and core idea of ​​the present application; at the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as limiting the present application.

[0073] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different nouns to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. As mentioned throughout the specification and claims, "including" and "comprising" are open-ended terms, so they should be interpreted as "including / including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problems within a preset error range and basically achieve the technical effects. The subsequent description of the specification is a preferred embodiment of the present application, but the description is for the purpose of illustrating the general principles of the present application, and is not used to limit the scope of the present application. The scope of protection of the present application shall be subject to that defined in the attached claims.

[0074] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0075] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0076] The above description shows and describes several preferred embodiments of the present application, but as mentioned above, it should be understood that the present application is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the application concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the present application, and should be within the scope of protection of the claims attached to the present application.

Claims

1. A bending process for rhenium alloy plates, characterized in that: The bending correction process comprises the following steps: S1) pre-treating the bent rhenium alloy sheet to be processed; S2) placing the rhenium alloy plate treated in S1) on a fixture and applying a pressing force; S3) installing the fixture equipped with the rhenium alloy plate in S2) on the base of the electron beam melting equipment, starting the circulating cooling water and performing vacuum treatment; S4) performing electron beam scanning preheating treatment on the bent rhenium alloy plate treated in S3); S5) performing electron beam bending processing on the plate after the preheating treatment in S4); S6) taking out the plate after the bending process in S5), rotating it 90°, and repeating S2) to S5); S7) performing electron beam polishing on the plate treated in S6).

2. The bending correction process according to claim 1, characterized in that: The rhenium alloy plate in S1) is a molybdenum-rhenium alloy or a tungsten-rhenium alloy, and the mass fraction of the rhenium element is 1% to 50%; The pretreatment includes grinding, polishing or cleaning.

3. The bending correction process according to claim 1, characterized in that: The fixture in S2) comprises: a lower bottom plate and an upper top plate; The upper top plate is provided with through holes for electron beam processing, and the lower bottom plate is provided with bolts and threaded holes for fixing; When in use, one end of the rhenium alloy plate is fixed to the lower bottom plate, and the other end is not fixed. The fixing method is electron beam spot welding or fixing with bolts and gaskets, and then the upper top plate is assembled.

4. The bending correction process according to claim 1, characterized in that: The lower base plate and the upper top plate are made of structural steel or stainless steel.

5. The bending correction process according to claim 1, characterized in that: The temperature of the circulating cooling water in S3) is not greater than 60° C. under electron beam processing; The vacuum degree of the equipment after vacuum treatment is not greater than 10 -3 Pa.

6. The bending correction process according to claim 1, characterized in that: During the electron beam scanning preheating process in S4), the electron beam power is 1-2 kW, the beam spot diameter is 12-20 mm, the moving speed is 12-24 mm / s, and the scanning interval is 6-16 mm.

7. The bending correction process according to claim 1, characterized in that: During the electron beam bending process in S5), the electron beam power is 2-5 kW, the beam spot diameter is 0.6-5 mm, the moving speed is 5-15 mm / s, and the scanning interval is 0.3-4 mm.

8. The bending correction process according to claim 1, characterized in that: The bending deformation of the plate taken out in S6) has been eliminated by more than 85% before being rotated 90°.

9. The bending correction process according to claim 1, characterized in that: During the electron beam polishing process in S7), the electron beam power is 1.5-3 kW, the beam spot diameter is 5-12 mm, the moving speed is 10-20 mm / s, and the scanning interval is 2.5-8 mm.

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