CN112646964B - High-temperature alloy with gradient nano-structure surface layer and preparation method thereof - Google Patents
High-temperature alloy with gradient nano-structure surface layer and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
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Abstract
The invention discloses a high-temperature alloy with a gradient nano-structure surface layer and a preparation method thereof, belonging to the technical field of metal material surface nanocrystallization. The surface mechanical grinding technology is utilized to process the high-temperature alloy, the spherical head is pressed into the surface of the material for grinding to a certain depth, so that the surface layer of the material generates gradient plastic deformation, a gradient structure which is formed by transition from nano grains to micron grains is formed on the surface of the high-temperature alloy, and a great hardness gradient is generated from the surface to the inside of the high-temperature alloy, so that the problems of thick surface grains, uneven microstructure, insufficient mechanical property and the like of the high-temperature alloy are solved. The invention has the characteristics of simple treatment, low energy consumption, suitability for industrial application and the like.
Description
Technical Field
The invention belongs to the technical field of metal material surface nanocrystallization, and particularly relates to a high-temperature alloy with a gradient nanostructure surface layer and a preparation method thereof.
Background
Since the twentieth century, the aviation technology gradually matures, wherein the development of aero-engines provides important driving force, the high-temperature alloy used as an important metal material for manufacturing aero-engines is rapidly developed, and the high-temperature alloy has the performance characteristics of high temperature resistance, oxidation resistance and corrosion resistance, and is applied to multiple fields of gas turbines, automobile engines, nuclear power and the like. The high-temperature alloy can be divided into the following components according to the types of matrix elements: 1) iron-based high-temperature alloy: the iron-based high-temperature alloy takes Fe as a matrix, Ni is added to stabilize an austenite structure, Cr is utilized to improve the oxidation resistance and corrosion resistance of the alloy, Mo and V are added to perform solid solution strengthening, and Ti, Al or Nb is added to perform precipitation strengthening. The iron-based high-temperature alloy has low cost, good medium-temperature mechanical property and easy hot working deformation, and is widely applied to materials such as turbine discs, turbine blades and the like. 2) The nickel-based high-temperature alloy comprises more than half of nickel content, a certain amount of Cr element is added to form the nickel-based high-temperature alloy with a Ni-Cr binary system as a matrix, and solid solution strengthening, precipitation strengthening and grain boundary strengthening elements, such as Co, Al, Ti, B and the like, are added for strengthening. The nickel-based superalloy has good high-temperature performance and good structural stability, has the largest grade, the largest use amount and the most important position in the superalloy, is most widely applied to aeroengines and gas turbines, and can be used at high temperature for a long time. The high-temperature strength of the nickel-based high-temperature alloy is generally better than that of the iron-based high-temperature alloy of the same type, and the nickel-based high-temperature alloy is mainly used for parts such as turbine discs, flame tubes, annular parts, guide blades and the like. 3) The cobalt-based high-temperature alloy takes cobalt as a main component, contains a considerable amount of Ni and Cr elements to stabilize austenite and improve the oxidation corrosion resistance. Meanwhile, alloy elements such as W, Mo, Ti, Nb and the like are added into the alloy, and solid solution strengthening and carbide strengthening are taken as main strengthening means. The cobalt-based high-temperature alloy has high melting point, excellent oxidation resistance and corrosion resistance, good cold and hot fatigue resistance and good welding process performance, and is suitable for parts bearing complex stress under high-temperature conditions, such as turbine guide blades, turbine discs, hot end parts of combustion chambers and the like of aeroengines and gas turbines.
The surface crystal grain of the high-temperature alloy part is coarse, the microstructure is not uniform, the high-temperature alloy part needs to bear the long-term action of high temperature and stress in the service process, the creep-fatigue-environment interaction often occurs, and the surface of the part possibly has the defects of work hardening, residual tensile stress and the like, so that the mechanical property of the high-temperature alloy part is adversely affected. The reduction of mechanical properties is directly related to the surface properties of the high-temperature alloy, and the conventional methods for improving the surface properties of the high-temperature alloy mainly comprise surface alloying, surface coating technology, rolling technology and the like. 1) And (4) surface alloying. The addition of alloy elements into the high-temperature alloy can generate solid solution strengthening, second phase strengthening and grain boundary strengthening, but can cause the increase of the variety of the alloy elements, aggravate the solidification segregation of the high-temperature alloy, and simultaneously increase the precipitation tendency of a TCP phase, so that the structural stability of the high-temperature alloy in the service process is reduced, the mechanical property is deteriorated, the danger of damage is brought to high-temperature alloy parts, and meanwhile, the surface alloying energy consumption is high, the process is complex, and the effect of deteriorating the hot-working performance is large. 2) Surface coating technology. Firstly, preparing particles with nanometer scale, and then solidifying the particles on the surface of the high-temperature alloy to form a nanometer structure surface layer with the same (or different) chemical composition with the matrix so as to adapt to different use environments. However, the interface bonding between the nanostructure surface layer and the substrate in the surface coating technology is often a big key problem, and the surface layer falls off in a complex use environment due to weaker interface bonding, larger difference of thermal expansion coefficients or low elastic matching degree, so that the service life of the high-temperature alloy is greatly reduced. 3) And (4) rolling technology. The rolling treatment can refine the high-temperature alloy grains to a certain degree, the grains are elongated, the dislocation density is increased, a residual compressive stress layer with a certain depth is generated on the surface of the material, the fatigue performance of the high-temperature alloy can be improved, but the coarse grains of the high-temperature alloy are not refined to a nanometer scale, the hardness and the fatigue performance are not obviously improved, and the method can be used as a method for processing ultrafine grains. The method has low energy consumption and simple treatment, and the new high-temperature alloy is prepared by the method, wherein the new high-temperature alloy does not increase the types of alloy elements, has no obvious interface between a surface layer and a substrate, and has excellent mechanical properties.
Disclosure of Invention
In order to solve the problems of coarse surface crystal grains, uneven microstructure, insufficient mechanical property and the like of the high-temperature alloy, the invention provides the high-temperature alloy with the gradient nano-structure surface layer and a preparation method thereof, and the high-temperature alloy is prepared by utilizing a surface mechanical grinding technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a high-temperature alloy with a gradient nano-structure surface layer is characterized in that a gradient organization structure surface layer with a certain thickness is formed on a substrate layer of the high-temperature alloy, the grain size of the crystal grain of the gradient organization structure surface layer is in gradient change from nano-scale to micron-scale from outside to inside, and the surface layer is sequentially divided into a nano-crystal layer, a submicron crystal layer and a deformed crystal grain layer from outside to inside according to the size of the crystal grain.
The grain size of the high-temperature alloy nanocrystalline layer is smaller than 100nm, the grain size of the submicron crystalline layer is 100-1000nm, and the grain size of the deformed crystalline layer is between 1000nm and the grain size of the matrix.
The thickness of the surface layer of the gradient organization structure is 100-600 mu m, wherein the thickness of the nanocrystalline layer is 10-70 mu m, the thickness of the submicron crystalline layer is 10-200 mu m, the preferred thickness is 30-130 mu m, the thickness of the deformed crystalline layer is 10-600 mu m, and the preferred thickness is 100-400 mu m.
The hardness gradient change range of the nano crystal layer is 5.0-35.0GPa/mm, the hardness gradient change range of the submicron crystal layer is 1.0-20.0GPa/mm, and the hardness gradient change range of the deformed crystal grain layer is 1.0-15.0 GPa/mm.
The high-temperature alloy is nickel-based high-temperature alloy, iron-based high-temperature alloy or cobalt-based high-temperature alloy.
And no obvious interface exists among the nanocrystalline layer, the submicron crystalline layer, the deformed crystalline grain layer and the substrate layer of the high-temperature alloy.
The preparation method of the high-temperature alloy with the gradient nano-structure surface layer comprises the following steps: the high-temperature alloy is processed by utilizing a surface mechanical milling technology, a processing cutter is pressed into the surface of a material to a certain depth, and the spherical head at the front end of the processing cutter is used for milling the surface of the material to generate gradient plastic deformation.
The mechanical grinding treatment of the surface of the high-temperature alloy is completed on a surface nanocrystallization processing system, the processing system comprises a rotating system, a tool rest feeding system, a processing tool and a cooling system, and the rotating system and the tool rest feeding system are realized by a numerical control lathe and respectively provide rotating motion and feeding motion; the processing cutter is arranged on the cutter rest feeding system, and the front end of the processing cutter is provided with a spherical head with a certain curvature radius; the cooling system is fixed on the tool rest feeding system and consists of an oil way and a cooling medium.
The surface mechanical grinding treatment process comprises the following steps: high temperature alloy rotation speed V1Rotating, and pressing the spherical head at the front end of the processing tool into the surface of the material to a certain depth a by a tool rest feeding systempThen machining the tool at a speed V2Move to a set position along the axial direction to finish a processAnd (4) carrying out treatment for each pass, repeating the process, and forming a gradient nano structure on the surface of the high-temperature alloy.
The spherical head at the front end of the processing cutter is made of bearing steel, die steel or hard alloy, and the curvature radius is 2mm-5 mm; rotational speed V of the superalloy150-1000r/min, the feed speed V of the processing cutter21-200mm/min, and the press reduction a of the processing cutter each timep20-200 μm, and 1-10 processing passes; the cooling system cools and lubricates materials and cutters through oily cutting fluid in the high-temperature alloy processing process, and the processing temperature is controlled to be room temperature.
The high-temperature alloy with the gradient nano-structure surface layer is applied to aeroengines, gas turbines, automobile engines and nuclear power industry.
The invention has the beneficial effects that:
the surface mechanical milling technology is characterized in that under the action of large strain, high strain rate and high strain gradient, high-temperature alloy surface layer grains can be refined to nanometer scale, a gradient nanometer structure can be formed on the surface of the high-temperature alloy, a gradient tissue structure of the surface layer from nanometer grains to micrometer grains is realized, the mechanical property of the high-temperature alloy is promoted, the high-temperature stability of the high-temperature alloy is kept, the service life of parts is prolonged, and the high-speed development of the high-temperature alloy is promoted.
1. Simple treatment process and low energy consumption. The invention can be assisted by a surface nanocrystallization processing system after the high-temperature alloy machining process, and can realize the controllable preparation of the gradient nanostructure surface layer by selecting proper process parameters, thereby greatly reducing the energy consumption.
2. The hardness gradient of the surface layer is large. After the high-temperature alloy is treated, the surface layer is a nano-crystalline grain structure, the core part is a coarse-crystalline grain structure, the hardness of the surface layer of the material is several times higher than that of the core part, and a large hardness gradient is formed from the surface to the inside, so that the high-temperature alloy is very favorable for improving the mechanical property of the high-temperature alloy.
3. Forming a gradient structure layer. After the surface mechanical grinding treatment is carried out on the high-temperature alloy, surface crystal grains are thinned to be below 100nm, a gradient structure layer with a certain thickness is formed on the substrate layer, wherein the nano crystal layer, the sub-micron crystal layer, the deformed crystal grain layer and the substrate layer have no obvious interfaces, the defects of surface cracks and the like are avoided, and the service life of the high-temperature alloy is prolonged.
Drawings
FIG. 1 is a schematic view of a surface nanocrystallization processing system for high-temperature alloy part processing.
In the figure: 1-a rotating system; 2-tool holder feed system; 3, machining a cutter; 4-a cooling system; 5-high temperature alloy parts.
FIG. 2 is a photograph of the microstructure of a cross section of a J75 iron-based superalloy component treated in accordance with the present invention.
FIG. 3 is a transmission electron micrograph of the surface layer of a J75 iron-based superalloy part treated by the present invention.
FIG. 4 is a cross-sectional microhardness profile of a J75 iron-based superalloy component treated in accordance with the present invention.
FIG. 5 is a photograph of a microstructure of a cross section of a solid solution Inconel718 nickel-base superalloy component treated in accordance with the present invention.
FIG. 6 is a transmission electron microscope photograph of the surface layer of a solid solution Inconel718 nickel-based superalloy part treated by the method.
FIG. 7 is a cross-sectional microhardness distribution of a solid solution Inconel718 nickel-base superalloy component treated in accordance with the present invention.
Figure 8 is a photograph of a cross-sectional microstructure of an aged Inconel718 nickel-base superalloy component treated in accordance with the present invention.
FIG. 9 is a transmission electron microscope photograph of the surface layer of an aged Inconel718 nickel-base superalloy part treated by the present invention.
Figure 10 is a cross-sectional microhardness profile of an aged Inconel718 nickel-base superalloy component treated in accordance with the present invention.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings and examples.
The invention provides a high-temperature alloy with a gradient nano-structure surface layer, wherein the grain size of the high-temperature alloy surface layer is in gradient change from nano-scale to micron-scale, a gradient structure layer with a certain thickness is formed on a substrate layer, and the high-temperature alloy surface layer is sequentially divided into a nano-crystal layer, a submicron crystal layer and a deformed crystal grain layer according to the grain size. The grain size of the high-temperature alloy nanocrystalline layer is smaller than 100nm, the grain size of the submicron crystalline layer is 100-1000nm, and the grain size of the deformed crystalline layer is between 1000nm and the grain size of the matrix. The thickness of the gradient structure layer is 100-600 μm, wherein the thickness of the nanocrystalline layer is 10-70 μm, the thickness of the submicron crystalline layer is 10-200 μm, preferably 30-130 μm, and the thickness of the deformed crystalline layer is 10-600 μm, preferably 100-400 μm. The hardness gradient change range of the nano crystal layer is 5.0-35.0GPa/mm, the hardness gradient change range of the submicron crystal layer is 1.0-20.0GPa/mm, and the hardness gradient change range of the deformed crystal grain layer is 1.0-15.0 GPa/mm. The high-temperature alloy is nickel-based high-temperature alloy, iron-based high-temperature alloy or cobalt-based high-temperature alloy. And no obvious interface exists among the nanocrystalline layer, the submicron crystalline layer, the deformed crystalline grain layer and the substrate layer of the high-temperature alloy.
The preparation method of the high-temperature alloy with the gradient nano-structure surface layer comprises the following steps: the high-temperature alloy is processed by utilizing a surface mechanical milling technology, a processing cutter is pressed into the surface of a material to a certain depth, and the spherical head at the front end of the processing cutter is used for milling the surface of the material to generate gradient plastic deformation. The superalloy treatment is performed on a surface nanocrystallization processing system, as shown in fig. 1, which includes a rotation system 1, a tool holder feed system 2, a processing tool 3, and a cooling system 4. The rotating system 1 and the tool rest feeding system 2 are realized by a numerical control lathe and respectively provide rotating motion and feeding motion; the processing tool 3 is arranged on the tool rest feeding system 2, and the front end of the processing tool is provided with a spherical head with a certain curvature radius; the cooling system 4 is fixed on the tool rest feeding system 2 and consists of an oil path and a cooling medium.
The method of the invention is implemented as follows:
firstly, clamping a high-temperature alloy part 5 on a rotating system 1, and ensuring the coaxiality of an excircle of the part 5; then, the machining tool 3 is mounted on the tool rest feeding system 2 and moves together with the tool rest feeding system 2, and the command editing is performed on the machining route. The cooling system 4 is opened, a machining instruction is started, and the high-temperature alloy part 5 is subjected to surface machiningAnd (5) mechanical grinding treatment. The high-temperature alloy part 5 is driven by the rotating system 1 to rotate at a rotating speed V1Rotating, and controlling the processing tool 3 to be pressed into the surface of the part 5 to a certain depth a by the tool rest feeding system 2pAt a speed V of the machining tool 32And (3) performing feeding movement, moving to a set position according to a processing route, completing one pass treatment, repeating the process for 1-10 times, and obtaining a gradient nano-structure surface layer on the high-temperature alloy part 5, wherein the high-temperature alloy part 5 is a high-temperature alloy rotating member.
In the invention, the material of the spherical head at the front end of the processing cutter 3 is high-speed steel, die steel or hard alloy, and the curvature radius is 2mm-5 mm. Rotational speed V of the superalloy component 5150-1000r/min, the feed speed V of the processing tool 321-200mm/min, and the rolling reduction a of the machining tool 3 each timep20-200 μm, and 1-10 processing passes; in the machining process, the cooling system 4 cools and lubricates the high-temperature alloy part 5 and the machining tool 3 through the oily cutting fluid, and the treatment temperature is controlled to be room temperature. The application of the high-temperature alloy with the gradient nano-structure surface layer is used for aeroengines, gas turbines, automobile engines and nuclear power industry.
The present invention will be described in detail with reference to specific examples.
Example 1
A J75 iron-based superalloy part with a diameter of 13mm was processed with a chemical composition (wt.%): 30.8% of Ni, 14.87% of Cr, 1.31% of Mo, 0.24% of V, 1.88% of Ti, 0.36% of Al, 0.19% of Si, 0.0008% of B and the balance of Fe; the heat treated state is a solid solution state.
The surface nanocrystallization treatment is carried out by adopting the method, the material of the spherical head at the front end of the processing cutter is hard alloy, and the curvature radius is 4 mm. J75 rotating speed V of iron-based high-temperature alloy part1300 r/min; feed speed V of machining tool29 mm/min; each pressing amount a of the machining toolpThe processing pass is 6 times when the grain size is 20 um; and an oily cutting fluid is adopted for cooling and lubricating in the processing process.
Test results show that after surface nanocrystallization treatment, a gradient structure layer with the thickness of about 500um is formed on the surface of the J75 iron-based superalloy component, wherein the thickness of a nanocrystalline layer is 60 micrometers, the thickness of a submicron crystalline layer is 100 micrometers, and the thickness of a deformed crystalline layer is 340 micrometers (figure 2). TEM and selected area electron diffraction analysis results show that the crystal grains on the outermost layer of the J75 iron-based superalloy part are refined to be below hundred nanometers, the minor axis size of the J75 iron-based superalloy part is 40nm (figure 3), and a gradient structure in which nanometer crystal grains are transited to micrometer crystal grains is formed on the surface of the part. The hardness value of the outermost surface layer of the part cross section can reach 5.3GPa, the cross section hardness shows a trend of decreasing with the increasing distance from the surface, and when the depth is about 650 mu m, the cross section hardness value is reduced to the hardness (1.5GPa) of a matrix, wherein the hardness gradient of the nano crystal layer is 28.3GPa/mm, the hardness gradient of the sub-micron crystal layer is 7.0GPa/mm, and the hardness gradient of the deformed crystal grain layer is 4.1GPa/mm (figure 4).
Example 2
An Inconel718 nickel-base superalloy part with a diameter of 14mm was treated with a chemical composition (wt.%): 19.1% of Fe, 17.91% of Cr, 3.01% of Mo, 5.32% of Nb, 0.96% of Ti, 0.45% of Al, 0.026% of C and the balance of Ni; the heat treated state is a solid solution state.
The surface nanocrystallization treatment is carried out by adopting the method, the material of the spherical head at the front end of the processing cutter is hard alloy, and the curvature radius is 4 mm. Solid solution state Inconel718 nickel-based superalloy part rotating speed V1500 r/min; feed speed V of machining tool28 mm/min; each pressing amount a of the machining toolpThe processing pass is 6 times when the grain size is 20 um; and an oily cutting fluid is adopted for cooling and lubricating in the processing process.
Test results show that after surface nanocrystallization treatment, a gradient structure layer with the thickness of about 350um is formed on the surface of the solid solution state Inconel718 nickel-based high-temperature alloy part, wherein the thickness of a nanocrystalline layer is 50 micrometers, the thickness of a submicron crystalline layer is 80 micrometers, and the thickness of a deformed crystalline layer is 220 micrometers (figure 5). TEM and selected area electron diffraction analysis results show that the crystal grains on the outermost layer of the solid solution Inconel718 nickel-based superalloy part are refined to be below hundred nanometers, the minor axis size of the part is 50nm (figure 6), and a gradient structure in which nano-crystal grains are transited to micron crystal grains is formed on the surface of the part. The highest hardness value of the outermost layer of the cross section of the part can reach 5.9 GPa; the cross-sectional hardness showed a decreasing trend with increasing distance from the surface, and when the depth was around 450um, the cross-sectional hardness value decreased to the hardness of the matrix (2.3GPa), with a nanocrystalline hardness gradient of 13.0GPa/mm, a sub-micron crystalline hardness gradient of 10.6GPa/mm, and a deformed crystalline grain layer hardness gradient of 9.5GPa/mm (fig. 7).
Example 3
An Inconel718 nickel-base superalloy part with a diameter of 14mm was treated with a chemical composition (wt.%): 19.1% of Fe, 17.91% of Cr, 3.01% of Mo, 5.32% of Nb, 0.96% of Ti, 0.45% of Al, 0.026% of C and the balance of Ni; the heat treated state is an aged state.
The surface nanocrystallization treatment is carried out by adopting the method, the material of the spherical head at the front end of the processing cutter is hard alloy, and the curvature radius is 4 mm. Rotating speed V of aging state Inconel718 nickel-based high-temperature alloy part1500 r/min; feed speed V of machining tool28 mm/min; each pressing amount a of the machining toolpAnd (3) cooling and lubricating by adopting an oily cutting fluid in the machining process, wherein the machining pass is 6 times when the thickness is 20 mu m.
Test results show that after surface nanocrystallization treatment, a gradient structure layer with the thickness of about 300um is formed on the surface of the aged Inconel718 nickel-based high-temperature alloy part, wherein the thickness of a nanocrystalline layer is 40 μm, the thickness of a sub-micron crystalline layer is 50 μm, and the thickness of a deformed crystalline layer is 210 μm (figure 8). TEM and selected area electron diffraction analysis results show that the crystal grains on the outermost layer of the aged Inconel718 nickel-based high-temperature alloy part are refined to be below hundred nanometers, the minor axis size of the part is 30nm (figure 9), and a gradient structure in which nano crystal grains are transited to micron crystal grains is formed on the surface of the part. The highest hardness value of the outermost layer of the cross section of the part can reach 6.6 GPa; the cross-sectional hardness showed a decreasing trend with increasing distance from the surface, and when the depth was about 400um, the cross-sectional hardness value decreased to the hardness of the matrix (4.5GPa), wherein the nano-crystal layer hardness gradient was 15.0GPa/mm, the sub-micron crystal layer hardness gradient was 8.0GPa/mm, and the deformed crystal layer hardness gradient was 5.2GPa/mm (FIG. 10).
Claims (7)
1. A preparation method of a high-temperature alloy with a gradient nano-structure surface layer is characterized by comprising the following steps: the high-temperature alloy is provided with a gradient nano-structure surface layer, the grain size of the surface layer is in gradient change from nano-scale to micron-scale from outside to inside, and the surface layer is sequentially divided into a nano-crystal layer, a submicron crystal layer and a deformed crystal grain layer from outside to inside according to the grain size; the high-temperature alloy is an iron-based high-temperature alloy or a cobalt-based high-temperature alloy;
the method comprises the steps of processing the high-temperature alloy by utilizing a surface mechanical milling technology, pressing a processing cutter into the surface of a material to a certain depth, and milling the surface of the material to generate gradient plastic deformation through a spherical head at the front end of the processing cutter so as to obtain the high-temperature alloy with a gradient nano-structure surface layer; the surface mechanical grinding treatment is completed on a surface nanocrystallization processing system, the processing system comprises a rotating system, a tool rest feeding system, a processing tool and a cooling system, and the rotating system and the tool rest feeding system are realized by a numerical control lathe and respectively provide rotating motion and feeding motion;
the surface mechanical grinding treatment process comprises the following steps: high temperature alloy rotation speed V1Rotating, and pressing the spherical head at the front end of the processing tool into the surface of the material to a certain depth a by a tool rest feeding systempThen machining the tool at a speed V2Moving to a set position along the axis direction, finishing one pass treatment, repeating the process, and forming a gradient nano structure on the surface of the high-temperature alloy;
wherein the rotational speed V150-1000r/min, the feed speed V of the processing cutter21-200mm/min, and the press reduction a of the processing cutter each timep20-200 μm, and 1-10 times of processing.
2. The method of claim 1, wherein: in the gradient nanostructure surface layer of the high-temperature alloy, the grain size of a nanocrystalline layer is smaller than 100nm, the grain size of a submicron crystalline layer is 100-1000nm, and the grain size of a deformed crystalline layer is between 1000nm and the grain size of a matrix.
3. The method of claim 1, wherein: the thickness of the surface layer of the gradient organization structure is 100-600 mu m, wherein the thickness of the nanocrystalline layer is 10-70 mu m, the thickness of the submicron crystalline layer is 10-200 mu m, and the thickness of the deformed crystalline layer is 10-600 mu m.
4. The method of claim 1, wherein: the hardness gradient change range of the nano crystal layer is 5.0-35.0GPa/mm, the hardness gradient change range of the submicron crystal layer is 1.0-20.0GPa/mm, and the hardness gradient change range of the deformed crystal grain layer is 1.0-15.0 GPa/mm.
5. The method of claim 1, wherein: and no obvious interface exists among the nanocrystalline layer, the submicron crystalline layer, the deformed crystalline grain layer and the substrate layer of the high-temperature alloy.
6. The method of claim 1, wherein: the processing cutter is arranged on the cutter rest feeding system, and the front end of the processing cutter is provided with a spherical head with a certain curvature radius; the cooling system is fixed on the tool rest feeding system and consists of an oil way and a cooling medium.
7. The method of claim 6, wherein: the spherical head at the front end of the processing cutter is made of bearing steel, die steel or hard alloy, and the curvature radius is 2mm-5 mm; the cooling system cools and lubricates materials and cutters through oily cutting fluid in the high-temperature alloy processing process, and the processing temperature is controlled to be room temperature.
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| CN115041996B (en) * | 2022-07-01 | 2023-09-15 | 广东工业大学 | Processing device and processing method for forming plane surface layer with gradient nano structure |
| CN115584454B (en) * | 2022-09-21 | 2023-11-10 | 中国科学院金属研究所 | Method for improving high-temperature alloy performance and application of high-temperature alloy in commercial MP35N nickel-cobalt-based high-temperature alloy |
| CN115612814A (en) * | 2022-10-11 | 2023-01-17 | 中山大学 | Method for preparing gradient structure biphase stainless steel based on thermal coupling recrystallization |
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