CN117305743A - Method for efficiently increasing nanocrystalline thickness of aerofoil bearing material - Google Patents
Method for efficiently increasing nanocrystalline thickness of aerofoil bearing material Download PDFInfo
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- CN117305743A CN117305743A CN202311250756.7A CN202311250756A CN117305743A CN 117305743 A CN117305743 A CN 117305743A CN 202311250756 A CN202311250756 A CN 202311250756A CN 117305743 A CN117305743 A CN 117305743A
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000000463 material Substances 0.000 title claims abstract description 41
- 238000005422 blasting Methods 0.000 claims abstract description 38
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 claims description 17
- 239000008188 pellet Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 26
- 239000002184 metal Substances 0.000 abstract description 26
- 229910001069 Ti alloy Inorganic materials 0.000 description 26
- 230000008569 process Effects 0.000 description 17
- 238000007709 nanocrystallization Methods 0.000 description 14
- 238000005728 strengthening Methods 0.000 description 14
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- 206010014357 Electric shock Diseases 0.000 description 6
- 239000007769 metal material Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000009210 therapy by ultrasound Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000002635 electroconvulsive therapy Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000005480 shot peening Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000002052 molecular layer Substances 0.000 description 1
- 239000002159 nanocrystal Substances 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Classifications
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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
-
- 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
- C22F3/00—Changing the physical structure of non-ferrous metals or alloys by special physical methods, e.g. treatment with neutrons
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The invention relates to a method for efficiently increasing the nanocrystalline thickness of a aerofoil bearing material, which comprises the following steps: adjusting parameters of ultrasonic shot blasting equipment; carrying out ultrasonic shot blasting treatment on the surface of the sample by using ultrasonic shot blasting equipment, wherein the treatment time is 8-10mins; cooling the sample; adjusting parameters of electric impact equipment, setting impact times to be 1-2 times, each time of electric impact time to be 0.02-0.05s, current magnitude to be 65-85A, and current density in the sample to be 25-35A/mm during electric impact treatment 2 The method comprises the steps of carrying out a first treatment on the surface of the The surface of the sample is subjected to electric impact treatment by an electric impact device. The invention can refine the grains of the aerofoil bearing material and improve the strength of the aerofoil bearing material; meanwhile, the high-efficiency treatment of grain refinement can be realized, so that the time originally required is shortened by one order of magnitude; in addition, the grain refinement thickness of the material can be increased, and on the basis of the grain size and the nanocrystalline thickness of the metal after the original ultrasonic shot blasting treatment,the average grain size is greatly reduced, and the high-strength grain refinement is realized.
Description
Technical Field
The invention belongs to the technical field of material surface strengthening, and particularly relates to a method for efficiently increasing the nanocrystalline thickness of an aerofoil bearing material.
Background
Titanium alloy has the advantages of high matrix strength, high bearing temperature, good vibration fatigue performance, excellent corrosion resistance and the like, and is commonly used for manufacturing turbine blades of aeroengines at present. M50 steel is often used in bearings for various parts of aeroengines due to its high hardness and excellent wear resistance. However, as the performance requirements of aeroengines are higher and higher, the strength requirements on internal parts such as turbine blades, bearings and the like of the aeroengines are also higher and higher, the strength and various performances of the original titanium alloy and the M50 bearing steel are gradually unsatisfied with the industry requirements, and the original titanium alloy and the M50 bearing steel are required to be further reinforced on the basis of original metals.
The surface nanocrystallization technology is a novel surface strengthening technology at present, has high efficiency, and can greatly improve the metal surface strength and enhance various surface properties such as wear resistance, corrosion resistance, fatigue resistance and the like. Ultrasonic shot blasting belongs to a high-efficiency surface nanocrystallization technology, and can greatly improve the metal performance on the premise of ensuring the metal surface roughness quality, and can greatly improve the surface quality and the deformation degree of difficult-to-deform metal, so that the ultrasonic shot blasting is widely studied and applied in the field of metal surface strengthening and the field of metal plastic forming.
Chinese patent CN 113046532a discloses a method for improving the nanocrystallization efficiency of the surface of a difficult-to-deform metal material, by first performing ultrasonic treatment, stopping the ultrasonic treatment when the effect of a pulse current is large, applying the pulse current, and using the electro-plasticity and electro-healing property of the current to heal the defect after shot blasting, so that the plasticity of the material is improved, and the subsequent shot blasting is easier; when the effect of the pulse current is weakened, the current is stopped, the ultrasonic treatment is performed again, the shot blasting is easy after the pulse current acts on the material, and the ultrasonic treatment and the pulse current treatment can be repeatedly performed. Therefore, the metal with higher treatment intensity can also obtain better effect, the time of shot blasting and current application is reduced, the energy consumption is saved, the energy utilization rate is improved, the thickness of the nano layer can be further deepened through repeated shot blasting and current treatment, and the surface nanocrystallization effect is better.
Chinese patent CN 113046531a discloses a method for improving the surface nanocrystallization efficiency of a difficult-to-deform metal material by in-situ electric pulse, applying pulse current treatment to two ends of the difficult-to-deform metal while ultrasonic peening treatment, utilizing the electro-plastic effect of the pulse current treatment on the metal to improve the plasticity of the difficult-to-deform metal, improving the efficiency of ultrasonic peening in the machining process, avoiding the condition that the surface nanocrystallization efficiency of the ultrasonic peening is reduced due to poor metal plasticity, and re-using the electric pulse treatment after peening is finished, so as to repair cracks of the metal caused by the surface nanocrystallization treatment.
The above patent uses electric pulse to assist ultrasonic shot blasting to treat metal surface, so as to raise nanocrystallization effect, but both processes need at least two times of electric pulse treatment in treatment process, so that the process flow and total treatment time are increased, and the electric pulse treatment can only play roles of electro-plasticity in ultrasonic shot blasting process, and the role of pulse current is not utilized to the greatest extent. In the surface nanocrystallization process, the ultrasonic peening technology is dominant, the thickness of the nanocrystalline generated after the ultrasonic peening is assisted by electric pulses is increased less, and the grain size is reduced less. The thickness of the surface nanocrystalline of the difficult-to-deform metal needs to be increased, and the grain size needs to be further refined.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for efficiently increasing the nanocrystalline thickness of the aerofoil bearing material, which can refine grains of the aerofoil bearing material and improve the strength of the aerofoil bearing material; meanwhile, the high-efficiency treatment of grain refinement can be realized, so that the time originally required is shortened by one order of magnitude; in addition, the grain refinement thickness of the material can be increased, and the average grain size of the material is greatly reduced on the basis of the grain size and the nanocrystalline thickness of the metal after the original ultrasonic shot blasting treatment, so that high-strength grain refinement is realized.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for efficiently increasing the nanocrystalline thickness of an aerofoil bearing material comprises the following steps:
s1, adjusting parameters of ultrasonic shot blasting equipment to enable the parameters to be located in a proper area;
s2, performing ultrasonic shot blasting treatment on the surface of the sample through ultrasonic shot blasting equipment, wherein the treatment time is 8-10mins;
s3, cooling the sample after ultrasonic shot blasting treatment;
s4, adjusting parameters of the electric impact equipment to enable the parameters to be located in a proper area, wherein the impact times are set to be 1-2 times, the electric impact time of each time is 0.02-0.05S, the current magnitude is 65-85A, and the current density in a sample during electric impact treatment is 25-35A/mm 2 ；
S5, performing electric impact treatment on the surface of the sample through electric impact equipment.
In the above scheme, in step S1, the frequency of the ultrasonic peening equipment is set to 15kHz-20kHz.
In the scheme, in the step S1, the tungsten carbide pellets are adopted as the pellets, and the number of the pellets is 20-35.
In the above scheme, the ultrasonic shot blasting equipment comprises an ultrasonic generator, an ultrasonic transducer, an amplitude transformer and an ultrasonic nozzle which are sequentially connected, wherein the surface of the ultrasonic nozzle is paved with shot particles, and a sample is arranged above the ultrasonic nozzle through a clamp.
In the above scheme, in step S3, the sample is left to stand in the room temperature environment for 1-2 hours or cooled down to room temperature rapidly by using cold water.
In the above scheme, the electric impact device comprises a variable power supply and a test piece clamping device, in step S5, the test piece clamping device is clamped at two ends of the longitudinal direction of the test sample, and the variable power supply is turned on to electrify the test sample, so that the test sample is subjected to the effect of electric impact.
The invention has the beneficial effects that:
1. the method provided by the invention can be used for effectively increasing the nanocrystalline thickness of the aerofoil bearing material, so that the method completely meets the current strength requirement, the nanocrystalline thickness of the aerofoil and the bearing material can be greatly increased, and the strength of the material can be enhanced by generating nanocrystalline and increasing the thickness of a nanocrystalline layer so as to meet the current industrial requirement. The invention not only ensures that the titanium alloy has thicker high-performance nanocrystalline layer, but also greatly reduces the average grain size and greatly improves the mechanical property of the titanium alloy. In addition, the invention solves the problem of lower efficiency of the existing surface strengthening method, and improves the efficiency by nearly one order of magnitude.
2. The invention carries out ultrasonic shot blasting superposition electric impact treatment on the aeronautical blade and bearing material, the two processes belong to asynchronous treatment, the overall process flow is shorter, and compared with the process flow of electric pulse assisted ultrasonic shot blasting treatment, the process flow is simpler, the process time is shortened, and the strengthening efficiency is increased. And the grains are refined again on the basis of the grains subjected to the original ultrasonic peening, so that the degree of refining the grains of the titanium alloy is greatly improved, the treatment time is greatly shortened, and the size and thickness of the nanocrystallines after nanocrystallines are far greater than those of the original metal material and the metal material after the electric pulse assisted ultrasonic peening.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic view of an ultrasonic peening apparatus according to the present invention;
FIG. 2 is a schematic view of the structure of the electric impact device in the method of the present invention;
FIG. 3 is a cross-sectional electron back-scattering diffraction pattern of the titanium alloy after the first ultrasonic peening treatment in example 1 of the present invention;
FIG. 4 is a cross-sectional electron back-scattering diffraction pattern of the titanium alloy after the second electric impact treatment in example 1 of the present invention;
FIG. 5 is a cross-sectional electron back-scattering diffraction pattern of M50 steel after the first ultrasonic peening treatment in example 2 of the present invention;
FIG. 6 is a cross-sectional electron back-scattering diffraction pattern of the M50 steel after the second electric shock treatment in example 2 of the present invention.
In the figure: 10. an ultrasonic peening apparatus; 11. an ultrasonic generator; 12. an ultrasonic transducer; 13. a horn; 14. an ultrasonic nozzle; 15. a pellet; 16. a clamp;
20. an electric shock device; 21. a specimen clamping device; 22. a variable power supply;
30. and (3) a sample.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
The first purpose of the invention is to refine grains of the aerofoil bearing material, improve the strength of the aerofoil bearing material and enable the aerofoil bearing material to meet the industrial requirements; the second purpose is to realize the high-efficiency treatment of the grain refinement process of the aerofoil bearing material, so that the time originally required is shortened by one order of magnitude; the third purpose is to increase the grain refinement thickness of the aerofoil bearing material, and on the basis of the grain size and the nanocrystalline thickness of the metal after the original ultrasonic shot blasting treatment, the average grain size is greatly reduced, so that high-strength grain refinement is realized.
In order to achieve the above purpose, the invention provides a method for efficiently increasing the nanocrystalline thickness of an aerofoil bearing material, which comprises the following steps:
s1, adjusting parameters of the ultrasonic peening equipment 10 so that the parameters are located in a proper area. As shown in fig. 1, the ultrasonic peening apparatus 10 includes an ultrasonic generator 11, an ultrasonic transducer 12, a horn 13, and an ultrasonic blast head 14 connected in this order, a shot 15 is laid on the surface of the ultrasonic blast head 14, and a specimen 30 is mounted above the ultrasonic blast head 14 by a jig 16. The frequency of the ultrasonic peening apparatus 10 is set to 15kHz-20kHz. The tungsten carbide pellets 15 are adopted as the pellets 15, and the number of the pellets is 20 to 35.
S2, performing ultrasonic shot blasting treatment on the surface of the sample 30 through the ultrasonic shot blasting equipment 10, namely generating ultrasonic energy through the ultrasonic generator 11, converting the ultrasonic energy into mechanical energy through the ultrasonic transducer 12, amplifying the amplitude of mechanical vibration through the amplitude transformer 13, and driving the shot 15 to impact the surface of the sample through the mechanical vibration by the ultrasonic nozzle 14 so as to generate serious plastic deformation on the surface of the material. The ultrasonic shot blasting treatment time is 8-10mins.
The surface of the ultrasonic shot blasting treatment is the surface with larger surface area of the sample, and the sample is subjected to single-sided treatment by adjusting proper parameters. The process can refine the crystal grains in the sample to a certain extent, so that the strength of the crystal grains is improved to obtain a basic improvement effect, the crystal grains in the sample are in gradient nanocrystallization, the strength of the sample is greatly improved, and the method belongs to a first-step strengthening process.
S3, performing ultrasonic shot blasting treatment, and then cooling the sample 30. The sample 30 may be left in a room temperature environment for 1-2 hours or allowed to cool rapidly to room temperature using cold water.
And S4, adjusting parameters of the electric impact equipment to enable the parameters to be located in a proper area. As shown in FIG. 2, the electric shock device 20 includes a specimen holding device 21 and a variable power source 22. Wherein the electric impact time is set to be 0.02-0.05s, the impact times are 1-2 times, the current size is 65-85A, and the current density in the sample during the electric impact treatment is 25-35A/mm 2 ；
And S5, carrying out electric impact treatment on the surface of the sample 30 through the electric impact equipment 20. The specimen clamping device 21 is clamped at two longitudinal ends of the specimen 30, the variable power supply 22 is started to electrify the specimen 30, so that the specimen 30 is subjected to the effect of electric impact, and the specimen belongs to a second-step strengthening process. The electric impact treatment belongs to a novel nanocrystallization treatment, and can further refine grains on the basis of original grains of metal in a recrystallization mode, and the number of metal nanocrystals is increased. The time of the electric shock treatment is shorter and is an order of magnitude lower than that of the electric pulse treatment, and the current is generated in different ways (the electric pulse is a voltage source and the electric shock is a current source), so that the current density of the electric shock treatment is far higher than that of the electric pulse treatment. The electric impact can further nanocrystallize the metal on the basis of ultrasonic shot blasting, and the effect of the electric impact is to directly nanocrystallize the metal so as to maximize the nanocrystallization degree of the metal; the electric pulse treatment is to soften metal and repair metal defects, and ultrasonic shot blasting is dominant in metal nanocrystallization. Therefore, after the second step of high-efficiency strengthening treatment, the high-performance aerovane and bearing material with thicker grain refinement layer and ultra-refined grain size is prepared.
According to the invention, through the first mechanical surface strengthening treatment, ultrasonic energy is transferred to the surface of the aeronautical blade bearing material (taking titanium alloy as an example) in an energy conversion and mechanical vibration mode, so that the surface of the titanium alloy is subjected to serious plastic deformation, beneficial residual compressive stress is generated, the surface grains of the titanium alloy are seriously thinned, the internal grains are in a gradient nano structure, the surface strength and the wear resistance of the titanium alloy are greatly improved, and a foundation is provided for efficiently preparing the novel aeronautical blade material titanium alloy with high performance, high strength and high wear resistance. After a period of cooling treatment, the titanium alloy subjected to the first mechanical surface strengthening treatment is prevented from influencing the internal grain structure due to overheating, meanwhile, the safety, the high efficiency and the accuracy of the electric impact treatment in the next stage are prevented from being influenced, and the influence of grain change caused by a thermal effect is reduced. Finally, through the second electric impact treatment process, two ends of the titanium alloy are clamped by two poles of the electric impact equipment 20, a large amount of current passes through the interior of the titanium alloy after mechanical surface strengthening in a very short time, namely tens of milliseconds, and the average size of grains in the titanium alloy is greatly reduced along with the phenomenon of electro-plastic effect and grain re-refinement, the thickness of a grain refinement layer is further increased, and the time required for reaching the target grain size and the thickness of the grain refinement layer is greatly shortened. The reinforced titanium alloy obtained by the invention also has higher hardness, excellent mechanical property and stronger wear resistance, and improves the quality of the titanium alloy.
Compared with the existing electric pulse assisted ultrasonic shot blasting treatment, the method has the advantages that the technical process is simpler, the required time is shorter, the prepared metal material has a thicker nanocrystalline layer, smaller nanocrystalline grain size and better mechanical property and strength.
The technical effects of the method of the present invention will be specifically described below by way of specific examples.
Example 1: the method is characterized in that an aircraft engine blade raw material titanium alloy is selected as an original sample, and the dimensions of the sample are 10mm-30mm in thickness, 30mm-60mm in length, and 20mm-50mm in width.
A method for efficiently increasing the nanocrystalline thickness of an aerofoil bearing material comprises the following steps:
(1) Parameters of the ultrasonic peening apparatus 10 were adjusted, which were set to a frequency of 20kHz for 8mins.
(2) The titanium alloy sample is subjected to ultrasonic shot blasting treatment, and ultrasonic energy is transmitted to the surface of the titanium alloy by the shot 15, so that the surface of the titanium alloy is severely plastically deformed. The number of the application pellets is 20-35.
(3) After ultrasonic shot blasting treatment, cooling the sample, and standing for 1-2h in room temperature environment or cooling rapidly by using cold water.
(4) Parameters of the electric impact device 20 were adjusted, which were set to an electric impact time of 0.04s, and a current magnitude of 70A.
(5) The positive and negative electrodes of the electric impact device 20 are respectively clamped at the two longitudinal ends of the sample, and the electric impact treatment is carried out on the titanium alloy sample, so that the inside of the titanium alloy sample generates an electro-plastic effect, the internal grains are further refined, and the thickness of the grain refinement layer is greatly increased.
As shown in FIGS. 3 and 4, the grains in the lower half of FIG. 3 near the specimen base layer were coarser and the entire average grain size was about 2 to 2.5. Mu.m, and the grains in the lower half of FIG. 4 near the specimen base layer were significantly finer and the entire average grain size was about 1 to 1.5. Mu.m. The grain refinement layer of the titanium alloy is increased by nearly one time, and the average grain size is reduced by 1-3 times.
Example 2: the material M50 steel after heat treatment of the aero-engine bearing is selected as an original sample, and the dimensions of the sample are 10mm-30mm in thickness, 30mm-60mm in length and 20mm-50mm in width.
A method for efficiently increasing the nanocrystalline thickness of an aerofoil bearing material comprises the following steps:
(1) Parameters of the ultrasonic peening apparatus 10 were adjusted, which were set to a frequency of 20kHz for 8mins.
(2) The M50 steel sample was subjected to ultrasonic shot peening, and ultrasonic energy was transmitted to the M50 steel surface by the shot 15, so that severe plastic deformation was caused on the M50 steel surface. The number of the application pellets is 20-35.
(3) After ultrasonic shot blasting treatment, cooling the sample, and standing for 1-2h in room temperature environment or cooling rapidly by using cold water.
(4) Parameters of the electric impact device 20 were adjusted, which were set to an electric impact time of 0.04s, and a current magnitude of 70A.
(5) The positive and negative electrodes of the electric impact device 20 are respectively held at both ends in the longitudinal direction of the specimen. And (3) carrying out electric impact treatment on the M50 steel sample to enable the inside of the M50 steel sample to generate an electro-plastic effect, further refine internal grains and greatly increase the thickness of a grain refinement layer.
As shown in FIGS. 5 and 6, the grain size of FIG. 5 is about 0.5-1 μm and the grain size of FIG. 6 is about 0.1-0.5 μm, the grain refinement layer of M50 steel is increased by 1-3 times, and the average grain size is reduced by 1-3 times.
The above examples prove that the method of the invention can realize the great refinement of the grain size, and the average grain size is further reduced compared with the grain size of the ultrasonic shot peening independent strengthening treatment; meanwhile, the invention realizes the great increase of the thickness of the nano grain layer, and compared with the sample subjected to ultrasonic shot blasting independent strengthening treatment, the thickness of the grain refining layer is enlarged by about 1-3 times. In the treatment process, the invention adopts the superposition treatment of ultrasonic peening mechanical surface nanocrystallization treatment and electric impact treatment for the first time, greatly reduces the time required for obtaining the target grain size and the thickness of the superfine grain layer, and shortens the time required for preparing the high-performance novel aerovane bearing material by nearly one order of magnitude compared with a sample subjected to ultrasonic peening independent strengthening treatment. The invention provides industrial convenience for manufacturing the novel aerofoil bearing material with high performance, high strength and high wear resistance, and ensures that the preparation process is more efficient and high in quality.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.
Claims (6)
1. The method for efficiently increasing the nanocrystalline thickness of the aerofoil bearing material is characterized by comprising the following steps of:
s1, adjusting parameters of ultrasonic shot blasting equipment to enable the parameters to be located in a proper area;
s2, performing ultrasonic shot blasting treatment on the surface of the sample through ultrasonic shot blasting equipment, wherein the treatment time is 8-10mins;
s3, cooling the sample after ultrasonic shot blasting treatment;
s4, adjusting parameters of the electric impact equipment to enable the parameters to be located in a proper area, wherein the impact times are set to be 1-2 times, the electric impact time of each time is 0.02-0.05S, the current magnitude is 65-85A, and the current density in a sample during electric impact treatment is 25-35A/mm 2 ；
S5, performing electric impact treatment on the surface of the sample through electric impact equipment.
2. The method for efficiently increasing the nanocrystalline thickness of a aerofoil bearing material according to claim 1, wherein in step S1, the frequency of the ultrasonic peening equipment is set to 15kHz-20kHz.
3. The method for efficiently increasing the nanocrystalline thickness of a aerofoil bearing material according to claim 1, wherein in step S1, the number of the tungsten carbide pellets is 20-35.
4. The method for efficiently increasing the nanocrystalline thickness of a aerofoil bearing material according to claim 1, wherein the ultrasonic peening equipment comprises an ultrasonic generator, an ultrasonic transducer, an amplitude transformer and an ultrasonic nozzle which are sequentially connected, pellets are paved on the surface of the ultrasonic nozzle, and a sample is installed above the ultrasonic nozzle through a clamp.
5. The method for efficiently increasing the nanocrystalline thickness of an aerofoil bearing material according to claim 1, wherein in step S3, the sample is left to stand in a room temperature environment for 1-2 hours or cooled down to room temperature rapidly using cold water.
6. The method for efficiently increasing nanocrystalline thickness of aerofoil bearing material according to claim 1, wherein the electric impact device comprises a variable power supply and a test piece clamping device, in step S5, the test piece clamping device is clamped at two longitudinal ends of the test piece, and the variable power supply is turned on to energize the test piece to receive the effect of electric impact.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115627471A (en) * | 2022-10-09 | 2023-01-20 | 武汉理工大学 | Preparation method of tungsten carbide reinforced coating on metal surface |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115627471A (en) * | 2022-10-09 | 2023-01-20 | 武汉理工大学 | Preparation method of tungsten carbide reinforced coating on metal surface |
| CN115627471B (en) * | 2022-10-09 | 2024-10-18 | 武汉理工大学 | Preparation method of tungsten carbide reinforced coating on metal surface |
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