CN111975206A - Laser impact curved surface imprinting and curved surface micro-morphology repairing process - Google Patents

Laser impact curved surface imprinting and curved surface micro-morphology repairing process Download PDF

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CN111975206A
CN111975206A CN202010678296.8A CN202010678296A CN111975206A CN 111975206 A CN111975206 A CN 111975206A CN 202010678296 A CN202010678296 A CN 202010678296A CN 111975206 A CN111975206 A CN 111975206A
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alloy
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morphology
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CN111975206B (en
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程维
戴峰泽
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Jiangsu University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
    • B23K26/356—Working by laser beam, e.g. welding, cutting or boring for surface treatment by shock processing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
    • B23K26/355—Texturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/60—Preliminary treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/70—Auxiliary operations or equipment
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The invention belongs to the field of laser surface texture forming, and particularly relates to a laser impact curved surface imprinting and curved surface micro-morphology repairing process. The TiNi alloy curved plate is pressed into a plane through low-temperature deformation, then the micro-morphology is manufactured on the surface of the TiNi alloy curved plate through a laser impact imprinting technology, and the plane plate is restored into the curved plate through high temperature, so that the restoration process cannot generate great influence on the micro-morphology, and the overall height of the surface micro-morphology is only slightly reduced without influencing the uniformity of the surface micro-morphology. The micro-morphology repair process attached to the process can also efficiently recover the failure morphology of the metal.

Description

Laser impact curved surface imprinting and curved surface micro-morphology repairing process
Technical Field
The invention belongs to the field of laser surface texture forming, and particularly relates to a laser impact curved surface imprinting and curved surface micro-topography repairing process.
Background
Laser impact imprinting is widely used in research as a novel imprinting technology. The technology is a high-precision micro-morphology which utilizes the high strain rate and high speed of laser to manufacture a heat-free influence area on the surface of metal, has no abrasion mark damage and no subsequent redundant process treatment. The process comprises the following steps: the laser penetrates through the water restraint layer (prolonging the action time of the laser and enlarging the energy peak value of the laser), the polyester black adhesive tape absorption layer (absorbing the heat effect brought by the laser) acts on the die, and the die is attached to the workpiece, so that the surface appearance of the die is imprinted on the surface of the workpiece. Chinese patent CN111014959A "a bionic surface preparation method based on laser shock imprint technology", imprints the surface topography of a biological blade into a metal sample by using photoresist through the laser shock imprint technology. However, this kind of laser impact imprinting method is not suitable for some curved metal plates, because the impact effect of the laser on the curved surface is more uneven than that on the flat surface, and the imprinting effect is also different in size.
The invention provides a process for combining TiNi shape memory alloy with a laser impact imprinting technology, which comprises the steps of pressing a TiNi alloy curved plate into a plane through low-temperature deformation, manufacturing micro-morphology on the surface of the TiNi alloy curved plate through the laser impact imprinting technology, and recovering the plane plate into the curved plate through high temperature, wherein the recovery process does not generate great influence on the micro-morphology, and only slightly reduces the integral height of the surface micro-morphology without influencing the uniformity of the surface micro-morphology. The micro-morphology repair process attached to the process can also efficiently recover the failure morphology of the metal.
Disclosure of Invention
In order to manufacture a uniform and nondestructive metal surface microtexture, the invention provides a laser impact curved surface imprinting and curved surface microtopography repairing process. The process combines the deformation advantage of the TiNi shape memory alloy with the high efficiency of laser impact imprinting to form a set of laser impact curved surface imprinting technology.
The invention relates to a laser shock curved surface imprinting process which is characterized by comprising the following steps of;
A) the TiNi alloy curved plate with Ni element content of 50-57% is purchased, the phase transition temperature is 100-120 ℃, and then the surface of the TiNi alloy curved plate is polished and cleaned.
B) And then manually rolling the curved plate back and forth into a plane by a metal roller at the temperature of 0 ℃.
C) 500-1000 holes with the diameter of 50 mu m are ablated on the surface of the Ti6Al4V alloy by picosecond laser in advance, the holes are distributed in a square array, the hole pitch is 30 mu m, the ablation hole depth is 10-20 mu m, and then the surface of the alloy is cleaned. And (3) putting the deformed TiNi alloy plate into a laser shock strengthening system, and wrapping the TiNi alloy plate and the Ti6Al4V alloy die together by using a black polyester adhesive tape (an absorption layer), wherein the alloy plate is in contact with one side with a pattern of the die, and the side corresponding to shock is the side without the pattern of the Ti6Al4V alloy. And (3) taking a water layer as a restraint layer, and performing laser impact on the surface of the alloy plate to manufacture the micro-morphology by using parameters of laser pulse energy of 4-6J, spot diameter of 2-3 mm, laser wavelength of 1024nm, frequency of 5-10 Hz, pulse width of 15-20 ns and transverse and longitudinal overlapping rate of spots of 30% in an environment with the room temperature of 15 ℃.
D) And finally, heating in an oil bath at 100 ℃ to reduce the TiNi alloy plane plate into a curved surface, thereby obtaining the final micro-morphology TiNi alloy curved surface plate.
The invention relates to a curved surface micro-topography repairing process which is characterized by comprising the following steps of;
A) and (3) manually rolling and pressing the TiNi alloy curved plate with the failed surface appearance into a plane repeatedly at the temperature of 0 ℃ through a metal roller adhered with polishing abrasive paper, and eliminating the surface appearance.
B) And (3) putting the deformed TiNi alloy plate into a laser shock strengthening system, and wrapping the TiNi alloy plate and a Ti6Al4V alloy die (the die is the die in laser shock curved surface imprinting) together by using a black polyester adhesive tape (an absorption layer), wherein the alloy plate is in contact with one side with a pattern of the die, and the side corresponding to shock is the side without the pattern of the Ti6Al4V alloy. And (3) taking a water layer as a constraint layer, and in an environment with the room temperature of 15 ℃, using parameters of laser pulse energy of 4-6J, the diameter of a light spot of 2-3 mm, laser wavelength of 1024nm, frequency of 5-10 Hz, pulse width of 15-20 ns and transverse and longitudinal overlapping rate of 30% of the light spot to manufacture a micro-morphology which is the same as the micro-morphology of the surface of the alloy plane plate pressed and printed in the laser impact curved surface pressing and printing process on the curved plate again through the laser impact pressing and printing process.
C) And finally, reducing the alloy curved surface morphology by heating in an oil bath at 100 ℃ to obtain the repaired TiNi alloy curved surface plate with the micro morphology which is the same as the final curved surface micro morphology obtained by the laser shock curved surface imprinting process.
The principle of the invention is as follows:
the TiNi shape memory alloy can restore the initial shape under the influence of a certain temperature after being deformed, and has a one-way memory effect. However, high temperatures can restore the shape memory alloy to its overall original shape, but do not completely eliminate the surface microtopography that it undergoes microfabrication. By utilizing the advantage, the shape of the shape memory alloy can be ensured by controlling the temperature, and then different processes are carried out under different shapes to manufacture the uniform and undamaged metal surface appearance.
The gain effect of the invention is as follows:
1. the problem of curvature damage of the curved plate can not occur in the imprinting process of laser impact curved surface imprinting, and compared with the ordinary laser impact curved surface imprinting, the surface appearance imprinted by the novel process is more uniform.
2. The subsequent self-contained curved surface micro-morphology repairing process has the characteristics of quick repairing, complete repairing and accurate repairing, and the curvature problem of the curved surface alloy plate can not be influenced.
3. The key point of the invention is that after the TiNi alloy is subjected to low-temperature deformation and laser impact imprinting, the mother phase morphology of the TiNi alloy can be completely reduced at high temperature, but the imprinted surface morphology can not be completely reduced, and the overall height of the surface morphology can be slightly reduced.
Drawings
FIG. 1 is a flow chart of a process for laser shock curved surface imprinting and curved surface micro-topography repair;
FIG. 2 is a schematic view of a laser shock curved surface imprinting process;
FIG. 3 is a schematic view of a curved surface micro-topography repair process;
FIG. 4 is a schematic view of a mold surface micro pattern (left) and a workpiece surface micro topography (right);
FIG. 5 is a graph of the random spot selection height distribution of two types of exemplary microtopography.
Detailed Description
The laser impact curved surface imprinting process is as follows:
a sample preparation stage: and (3) grinding, polishing and cleaning the TiNi alloy curved plate with the Ni element content of 50-57% and the phase transition temperature of 100-120 ℃.
Low-temperature deformation: and manually rolling the curved plate back and forth into a plane through a metal roller at the temperature of 0 ℃.
Laser shock imprinting: 500-1000 holes with the diameter of 50 mu m are ablated on the surface of the Ti6Al4V alloy by picosecond laser in advance, the holes are distributed in a square array, the hole pitch is 30 mu m, the ablation hole depth is 10-20 mu m, and then the surface of the alloy is cleaned. And (3) putting the deformed TiNi alloy plate into a laser shock strengthening system, and wrapping the TiNi alloy plate and the Ti6Al4V alloy die together by using a black polyester adhesive tape (an absorption layer), wherein the alloy plate is in contact with one side with a pattern of the die, and the side corresponding to shock is the side without the pattern of the Ti6Al4V alloy. The method comprises the steps of carrying out laser impact imprinting in an environment with the room temperature of 15 ℃ by taking a water layer as a constraint layer, wherein parameters of the laser impact imprinting comprise laser pulse energy of 4-6J, the diameter of a light spot of 2-3 mm, laser wavelength of 1024nm, frequency of 5-10 Hz, pulse width of 15-20 ns and transverse and longitudinal overlapping rate of the light spot of 30%, and then enabling the surface of the TiNi alloy plate to generate micron-sized micro-morphology.
And (3) heating to reduce the morphology: and heating the TiNi alloy plate by using a 100 ℃ oil bath for 2min to reduce the TiNi alloy plate into the micro-morphology TiNi alloy curved plate.
The curved surface micro-topography repairing process comprises the following steps:
and (3) eliminating failure morphology at low temperature: and (3) placing the TiNi alloy curved plate with the surface appearance losing efficacy in an environment of 0 ℃, manually rolling and pressing the TiNi alloy curved plate back and forth into a plane by using a metal roller adhered with polishing abrasive paper, and repeatedly rubbing to eliminate the surface appearance of the TiNi alloy curved plate.
Laser shock re-imprinting: and putting the processed plane TiNi alloy plate into a laser shock strengthening system, and wrapping the TiNi alloy plate and the Ti6Al4V alloy die together by using a black polyester adhesive tape (an absorption layer), wherein the alloy plate is in contact with one side with a pattern of the die, and the side corresponding to shock is the side without the pattern of the Ti6Al4V alloy. The method comprises the steps of carrying out laser impact imprinting in an environment with the room temperature of 15 ℃ by taking a water layer as a constraint layer, wherein parameters of the laser impact imprinting comprise laser pulse energy of 4-6J, the diameter of a light spot of 2-3 mm, the wavelength of laser light of 1024nm, the frequency of 5-10 Hz, the pulse width of 15-20 ns and the transverse and longitudinal overlapping rate of the light spot of 30%, and then enabling the surface of the TiNi alloy plate to generate micro-morphology again, wherein the micro-morphology is the same as that manufactured by the previous laser impact imprinting.
High-temperature reduction of morphology: and heating the TiNi alloy plate for 2min by using a 100 ℃ oil bath to obtain the repaired micro-morphology TiNi alloy curved plate.
Example 1
Laser shock imprint process for treating Ti50Ni50Curved alloy plate
The purchased TiNi alloy curved plate with the phase transition temperature of 100 ℃ is ground, polished and cleaned, and then the surface of the TiNi alloy curved plate is subjected to energy spectrum analysis by an energy spectrometer (EDS) to obtain the TiNi alloy curved plate with the element ratios of 50.1% of Ni, 0.03% of C, 0.005% of H, 0.01% of O and the balance of Ti. Placing the sample in a refrigerated space with an ambient temperature of 0 deg.C, and rolling Ti with a metal roller50Ni50The curved plate is manually rolled into a flat plate. Then, a picosecond laser is used for ablating 600 holes with the diameter of 50 microns on the surface of the Ti6Al4V alloy, the holes are distributed in a square array, the hole pitch is 30 microns, the depth of the ablated holes is 10-20 microns, and the surface of the alloy is cleaned. Ti after deformation50Ni50The alloy plate was placed in a laser shock peening system and Ti was bonded with black polyester tape (absorber layer)50Ni50The alloy plate and the Ti6Al4V alloy die are wrapped together, wherein the alloy plate is in contact with one side with a pattern of the die, and the side corresponding to the impact is the side without the pattern of the Ti6Al4V alloy. The water layer is taken as a constraint layer to carry out laser impact imprinting in the environment with the room temperature of 15 ℃, the parameters of the laser impact imprinting are laser pulse energy 4J, the diameter of a light spot is 3mm, the laser wavelength is 1024nm, the frequency is 10Hz, the pulse width is 20ns, the transverse and longitudinal overlapping rate of the light spot is 30 percent, so that Ti is formed50Ni50The surface of the alloy plate generates micron-sized surface micro-topography. And finally, heating the TiNi alloy plate by using a 100 ℃ oil bath for 2min to reduce the TiNi alloy plate into the micro-morphology TiNi alloy curved plate.
Micro-morphology failure repairing Ti by curved surface repairing process50Ni50Curved alloy plate
Ti with ineffective surface appearance50Ni50The alloy curved plate is placed in a refrigerating chamber with the ambient temperature of 0 ℃, manually rolled and flattened by a metal roller adhered with polishing sand paper, and repeatedly rubbed to eliminate the surface appearance of the alloy curved plate. Planar Ti after treatment50Ni50The alloy plate was placed in a laser shock peening system and Ti was bonded with black polyester tape (absorber layer)50Ni50The alloy plate and the Ti6Al4V alloy die are wrapped together, wherein the alloy plate is in contact with one side with a pattern of the die, and the side corresponding to the impact is the side without the pattern of the Ti6Al4V alloy. Using a water layer as a constraint layer to perform laser impact imprinting in an environment with the room temperature of 15 ℃, wherein the parameters of the laser impact imprinting are laser pulse energy 5J, the diameter of a light spot is 3mm, the wavelength of laser is 1024nm, the frequency is 10Hz, the pulse width is 20ns, the transverse and longitudinal overlapping rate of the light spot is 30 percent, and then Ti is subjected to laser impact imprinting50Ni50The surface of the alloy plate regenerates micron-sized surface micro-morphology which is the same as the morphology manufactured by the front laser impact imprinting. Finally, heating Ti with 100 deg.C oil bath50Ni50Alloy plate 2min to obtain repaired micro-morphology Ti50Ni50Alloy curved plate.
Example 2
Conventional laser shock imprint process for treating Ti50Ni50Alloy curved plate
The Ti with the element ratio of 50.1 percent of Ni, 0.03 percent of C, 0.005 percent of H, 0.01 percent of O and the balance of Ti element and the phase transition temperature of 100 DEG C50Ni50Placing the alloy curved plate into a laser shock strengthening system, and using black polyester adhesive tape (absorbing layer) to make Ti50Ni50The alloy plate and the Ti6Al4V alloy die are wrapped together, wherein the alloy plate is in contact with one side with a pattern of the die, and the side corresponding to the impact is the side without the pattern of the Ti6Al4V alloy. The water layer is taken as a constraint layer to carry out laser impact imprinting in the environment with the room temperature of 15 ℃, the parameters of the laser impact imprinting are laser pulse energy 4J, the diameter of a light spot is 3mm, the laser wavelength is 1024nm, the frequency is 10Hz, the pulse width is 20ns, the transverse and longitudinal overlapping rate of the light spot is 30 percent, so that Ti is formed50Ni50The surface of the alloy plate generates micron-sized surface micro-topography.
By olympusOptical digital microscope measured Ti under the laser shock imprint process of example 150Ni50The average height of the micro-topography protrusions on the surface of the alloy curved plate (the average height is measured by selecting 10 protrusions uniformly distributed on the curved surface and then taking the average value) is 10.6 mu m, the overall height is uniform, and Ti after the curved surface repairing process50Ni50The average height of the micro-topography of the surface of the curved plate is 10.3 mu m, and the initial Ti50Ni50The alloy curved plates are close. Ti in example 2 was measured50Ni50The average height of the micro-topography protrusions of the alloy curved plate is 12.4 mu m (the point selection mode is the same as that of the example 1), and is higher than the surface average height obtained by the laser shock imprinting method, but the overall height is different, and the measured height values of the example 1 and the example 2 are shown in figure 5. The uneven height distribution of example 2 is caused by the uneven distribution of the force of the laser impinging on the curved surface.
Table 1 comparison of surface topography between example 1 and example 2
Figure BDA0002584895840000051
Figure BDA0002584895840000061
The process object of the invention is not limited to the TiNi shape memory alloy in the above example, and the process manufacturing morphology comprises all micro-morphologies which can be manufactured on curved surface metal, and is not limited to the boss array morphology in the example.

Claims (9)

1. A laser shock curved surface imprinting process is characterized in that a TiNi alloy curved surface plate with a parent phase of a curved surface is polished and cleaned, the TiNi alloy curved surface plate is rolled to a plane through low-temperature deformation, micro-morphology is manufactured on the surface of the alloy plate through laser shock, and finally the TiNi alloy curved surface plate is reduced into a curved surface through high temperature to obtain a final micro-morphology TiNi alloy curved surface plate, and the specific steps are as follows:
A) grinding, polishing and cleaning the surface of the TiNi alloy curved surface;
B) manually rolling the curved plate back and forth into a plane through a metal roller;
C) preparing a micro-morphology on the surface of the Ti6Al4V alloy by picosecond laser in advance; placing the deformed TiNi alloy flat plate into a laser shock strengthening system, wrapping the TiNi alloy plate and Ti6Al4V alloy serving as a die together by using an absorption layer, wherein the TiNi alloy flat plate is in contact with one side with a pattern of the die, and the side surface corresponding to shock is the side without the pattern of the Ti6Al4V alloy, so that laser shock is carried out to manufacture micro-morphology on the surface of the alloy plate;
D) heating to reduce the TiNi alloy plane plate into a curved surface, and obtaining the final micro-morphology TiNi alloy curved surface plate.
2. The laser shock curved surface imprinting process of claim 1, wherein in step a), the Ni element content of the TiNi alloy curved plate is 50-57% by mass, and the transformation temperature is 100-120 ℃.
3. The laser shock curved surface imprinting process of claim 1, wherein in step B), the curved plate is manually rolled back and forth into a flat surface by a metal roller at 0 ℃.
4. The laser shock curved surface imprinting process of claim 1, wherein in step C), the micro-topography fingers are prepared on the surface of the Ti6Al4V alloy by using picosecond laser in advance: ablating 500-1000 holes with the diameter of 50 mu m on the surface of the Ti6Al4V alloy by picosecond laser in advance, wherein the holes are distributed in a square array, the hole pitch is 30 mu m, the ablation hole depth is 10-20 mu m, and then cleaning the surface of the alloy; the method comprises the following steps of taking a water layer as a restraint layer, and carrying out laser impact on the surface of an alloy plate to manufacture micro-morphology in an environment with the room temperature of 15 ℃, by using parameters of laser pulse energy of 4-6J, the diameter of a light spot of 2-3 mm, laser wavelength of 1024nm, frequency of 5-10 Hz, pulse width of 15-20 ns and transverse and longitudinal overlapping rate of the light spot of 30%; the absorbing layer is black polyester adhesive tape.
5. The laser shock curved surface imprinting process of claim 1, wherein in step D), the TiNi alloy flat plate is heated in an oil bath at 100 ℃ to reduce the TiNi alloy flat plate into a curved surface, thereby obtaining the final microtopography TiNi alloy curved plate.
6. The curved surface micro-morphology repairing process is characterized in that a TiNi alloy curved plate with an invalid surface morphology is manually rolled back and forth at a low temperature through a metal roller adhered with polishing abrasive paper to form a plane and is repeatedly rubbed to eliminate the surface morphology, the micro-morphology is manufactured on the curved plate again through a laser impact imprinting process, and finally the alloy curved surface morphology is heated and reduced, and the method comprises the following specific steps:
E) manually rolling and pressing the TiNi alloy curved plate with the failed surface appearance into a plane repeatedly by a metal roller adhered with polishing abrasive paper, and eliminating the surface appearance of the TiNi alloy curved plate;
F) placing the deformed TiNi alloy plate into a laser shock strengthening system, wrapping the TiNi alloy plate and a Ti6Al4V alloy mould with a micro-morphology on the surface by using an absorption layer, wherein the alloy plate is in contact with one surface with a pattern of the mould, the side surface corresponding to shock is the side of the Ti6Al4V alloy without the pattern, and re-manufacturing the micro-morphology on the curved plate by a laser shock imprinting process;
G) and heating and reducing the alloy curved surface morphology to obtain the repaired micro-morphology TiNi alloy curved plate.
7. The curved surface micro-topography repairing process according to claim 6, wherein in the step E), the TiNi alloy curved plate with failed surface topography is manually and repeatedly rolled into a plane through a metal roller adhered with polishing sand paper at the temperature of 0 ℃ and the surface topography of the TiNi alloy curved plate is eliminated; the mass percentage of Ni element of the TiNi alloy curved plate is 50-57%, and the phase transition temperature is 100-120 ℃.
8. The curved surface micro-topography repair process according to claim 6, wherein in step F), the absorbing layer is a black polyester tape; the micro-morphology of the Ti6Al4V alloy mold surface means C) that 500 and 1000 holes with the diameter of 50 mu m are ablated on the Ti6Al4V alloy surface by picosecond laser in advance, the holes are distributed in a square array, the hole distance is 30 mu m, and the ablation hole depth is 10-20 mu m; the method is characterized in that a water layer is used as a restraint layer, and in an environment with the room temperature of 15 ℃, the micro-morphology is manufactured on the curved plate again through a laser impact imprinting process by using parameters of laser pulse energy of 4-6J, the diameter of a light spot of 2-3 mm, the wavelength of laser light of 1024nm, the frequency of 5-10 Hz, the pulse width of 15-20 ns and the transverse and longitudinal overlapping rate of the light spot of 30%.
9. The curved surface microtopography restoration process according to claim 6, wherein in the step G), the alloy curved surface topography is heated and reduced under 100 ℃ oil bath condition.
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Publication number Priority date Publication date Assignee Title
US6410884B1 (en) * 1999-07-19 2002-06-25 The Regents Of The University Of California Contour forming of metals by laser peening
CN104372167A (en) * 2014-10-11 2015-02-25 江苏大学 Projection gray scale based method for laser shock homogeneous strengthening of complex curved surface
CN105039652A (en) * 2015-04-29 2015-11-11 江苏大学 Laser shock uniform enhancement method with square-shaped light spot used in curved surface
CN105567946A (en) * 2016-01-06 2016-05-11 广东工业大学 Path planning device of laser shot blasting strengthened hook surface and path planning method for device
CN105817518A (en) * 2016-05-12 2016-08-03 北京机电研究所 Method and device for improving room temperature forming performance of magnesium alloy
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CN111299839A (en) * 2020-02-24 2020-06-19 江苏大学 Laser impact imprinting device and method based on constrained layer improvement

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