CN110791644A - Device and method for pulsed magnetic field assisted laser shock peening - Google Patents
Device and method for pulsed magnetic field assisted laser shock peening Download PDFInfo
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- CN110791644A CN110791644A CN201910783669.5A CN201910783669A CN110791644A CN 110791644 A CN110791644 A CN 110791644A CN 201910783669 A CN201910783669 A CN 201910783669A CN 110791644 A CN110791644 A CN 110791644A
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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
- C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
- C21D10/005—Modifying the physical properties by methods other than heat treatment or deformation by laser shock processing
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Abstract
The invention relates to the field of laser processing, in particular to a device and a method for frequency-conversion pulsed magnetic field assisted laser shock peening. The variable pulse magnetic field is obtained by electrifying the induction coil through the alternating current power supply, the surface of the base material acts on high-temperature plasma generated by laser, the macroscopical heating is carried out in the material, the thermal coupling effect is generated in the laser shock strengthening process to promote the evolution of the microstructure, the high magnetic pressure of the high-frequency magnetic field and the laser shock wave are utilized to cooperate with the shock to promote the dislocation pinning phenomenon of the internal structure of the base material, and the mechanical properties such as plastic deformation of the material are enhanced.
Description
Technical Field
The invention relates to the field of laser processing, in particular to a device and a method for frequency-conversion pulsed magnetic field assisted laser shock peening, which can obviously improve the effect of laser shock peening.
Background
The laser shock strengthening technology is characterized in that high-energy laser pulses act on the surface of a material covered by an absorption layer and a constraint layer, when the high-energy laser pulses pass through the constraint layer and impact the surface of the material, the absorption layer material is gasified and evaporated to form plasma, the plasma continuously absorbs energy and rapidly expands to form high pressure between the surface of the material and the constraint layer, the high pressure is transmitted into the material in the form of shock waves, when the pressure of the shock waves exceeds the dynamic yield strength of metal, the near-surface region of the material can be plastically deformed, and surface crystal grains of the material are strengthened due to dislocation motion in the plastic deformation process.
The method for applying the pulsed magnetic field to assist laser shock peening is a method for effectively enhancing the effect of laser shock waves. The invention patent CN106148672A discloses a method for laser shock peening assisted by an external variable magnetic field, which obtains different magnetic field strengths by changing the current, performs laser shock peening on a sample under corresponding magnetic field strengths, and mainly seeks for a good magnetic field strength range of a material in the magnetic field assisted laser shock peening process. The invention can generate a pulse medium frequency magnetic field, generate induced current in countless small magnetic poles in the matrix to enable the magnetic poles to mutually rub and collide to generate heat so as to achieve the effect of preheating the matrix material, and generate a thermal coupling effect in the laser shock strengthening process to promote the microstructure evolution in the strain process; the high-frequency magnetic field provided by the pulse magnetic field and the laser impact synchronously implement strong magnetic impact, under the condition of double impact, the surface of the base material cannot be deformed in addition macroscopically while a deeper residual compressive stress layer is induced, and the technical scheme is not a simple test for obtaining the magnetic field intensity range with better laser impact strengthening effect.
Disclosure of Invention
The invention aims to provide a device and a method for assisting laser shock strengthening by a pulse magnetic field, which mainly obtain a variable pulse magnetic field by electrifying an induction coil by an alternating current power supply, act on high-temperature plasma generated by laser on the surface of a substrate material, heat macroscopically in the material, generate a thermal coupling effect to promote the evolution of a microstructure in the laser shock strengthening process, and promote the dislocation pinning phenomenon of the tissue in the substrate by utilizing the high magnetic pressure of the high-frequency magnetic field and the synergistic impact of laser shock waves to enhance the mechanical properties of the material, such as plastic deformation and the like.
The invention provides a device for assisting laser shock peening by a pulse magnetic field, which comprises a laser processing system, an electromagnetic assisting system, a motor servo system, a guide rail and a base, wherein the guide rail is arranged on the base. The laser processing system comprises a laser generator, an external light path and a substrate clamp, wherein the external light path is positioned right above a substrate arranged on the substrate clamp; the electromagnetic auxiliary system comprises an alternating power supply, an induction coil clamp and a fixing plate, wherein one end of the induction coil clamp is fixed on the fixing plate, and the other end of the induction coil clamp is used for connecting the alternating power supply and the induction coil; the fixed plate is arranged on one side of the base, and the induction coil is positioned right above the base body.
The induction coil is made of a copper tube with the wall thickness of 1mm and the diameter of 5 mm.
The induction coil anchor clamps comprise two L type right angle boards, and two L type right angle boards adopt bolt and nut to connect, and the L type right angle board that is located the top is installed on the fixed plate, and the L type right angle board that is located the below passes through bolt and nut with the insulation board on the induction coil to be fixed, drills on the L type right angle board of below, and induction coil passes through the wire with the alternating power and forms the electricity and be connected.
The substrate clamp and the induction coil clamp are made of low-density nonmagnetic epoxy resin materials.
The motor servo system is positioned on one side of the base and connected with the guide rail.
The invention provides a method for assisting laser shock peening by a pulse magnetic field, which specifically comprises the following steps:
(1) installing an induction coil clamp on a fixing plate, installing an induction coil on the coil clamp, and adjusting the position of the fixing plate to enable the center point of the induction coil to be on the center line of the laser beam;
(2) fixing a substrate to be processed by using a substrate clamp, and adjusting the position of the substrate to be positioned at a position 3-6mm below the induction coil to be locked;
(3) starting an alternating current power supply to input sine wave alternating current to the induction coil, wherein the current range is 50-300A, and the frequency is 20-200 kHz; opening a laser processing system, and setting required laser processing technological parameters including the diameter of a light spot being 2-4mm, the wavelength being 1064nm, the pulse width being 8-30ns and the pulse energy being 3-15J;
(4) by adjusting the current, the induction coil firstly generates a medium-frequency magnetic field to preheat the base material, so that the internal stress is reduced; adjusting the current, and enabling the induction coil to generate a high-frequency magnetic field and laser shock waves to cooperatively work to impact the surface of the base material until the laser shock strengthening is finished;
(5) the motor servo system controls the base clamp to drive the base to move on the guide rail, and the whole machining process is completed.
The preheating of the base material means that the temperature of the surface of the base material to be impacted reaches 50 ℃.
The induction coil is cooled by a water circulation cooling system.
And the magnetic induction intensity of the high-frequency magnetic field is 3-10T.
The invention has the beneficial effects that:
compared with the traditional laser shock strengthening process, the added pulse magnetic field can act with charged particles of plasma clusters generated by laser shock waves, the volume of the plasma clusters is compressed, the speed of the plasma clusters is improved, and therefore the effect of laser shock is enhanced. Compared with the existing magnetic field assisted laser shock strengthening method, the method can generate the pulse intermediate frequency magnetic field to generate induced current to countless small magnetic poles in the matrix so that the magnetic poles rotate at high speed and rub and collide with each other to generate a heat effect, thereby achieving the effect of preheating the matrix material, and generating a thermal coupling effect in the laser shock strengthening process to promote the microstructure evolution in the strain process; the high-frequency magnetic field provided by the pulse magnetic field and the laser impact synchronously implement strong magnetic impact, under the condition of double impact, the surface of the base material cannot be subjected to additional deformation macroscopically while a deeper residual compressive stress layer is induced, the dislocation pinning phenomenon of the microstructure of the base body is promoted, and the plastic deformation capability of the base material is enhanced.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention.
Wherein 1 is external optical path, 2 is induction coil, 3 is the absorbed layer, 4 is the base member, 5 is motor servo, 6 is laser generator, 7 is L type right-angle board, 8 is the fixed plate, 9 is alternating power supply, 10 is the base member anchor clamps, 11 is the guide rail, 12 is the base.
FIG. 2 shows the results of the tests performed in the examples of the present invention.
FIG. 3 is a schematic diagram illustrating the gain effect of the present invention.
Detailed Description
The present invention will be described in more detail with reference to the following examples and the accompanying drawings, which are provided for illustration of the present invention and are not intended to limit the scope of the present invention.
In this embodiment, a 6061-T6 aluminum alloy flat plate is used as a base material, and the device for pulsed magnetic field assisted laser shock peening provided by the invention is shown in fig. 1, and comprises a laser processing system, an electromagnetic assisting system, a motor servo system 5, a guide rail 11 and a base 12, wherein the guide rail 11 is arranged on the base 12. The laser processing system comprises a laser generator 6, an external light path 1 and a substrate clamp 10, wherein the external light path 1 is positioned right above a substrate 4 arranged on the substrate clamp 10, and the substrate clamp 10 is arranged on a guide rail 11; the electromagnetic auxiliary system comprises an alternating power supply 9, an induction coil 2, an induction coil clamp and a fixing plate 8, wherein one end of the induction coil clamp is fixed on the fixing plate 8, and the other end of the induction coil clamp is used for connecting the alternating power supply 9 and the induction coil 2; the fixed plate 8 is arranged on one side of the base 12, and the induction coil 2 is positioned right above the base body.
The induction coil 2 is made of a copper tube with the wall thickness of 1mm and the diameter of 5 mm.
Induction coil anchor clamps comprise two L type right angle boards 7, and two L type right angle boards 7 adopt bolt and nut to connect, and the L type right angle board 7 that is located the top is installed on fixed plate 8, and the L type right angle board 7 that is located the below passes through bolt and nut with induction coil 2 last insulation board to be fixed, drills on the L type right angle board 7 of below, and induction coil 2 passes through the wire with alternating power supply 9 and forms the electricity and be connected.
The substrate fixture 10 and the induction coil fixture are made of low-density and nonmagnetic epoxy resin materials.
The motor servo system 5 is positioned on one side of the base 12 and connected with the guide rail 11.
The invention provides a method for assisting laser shock peening by a pulse magnetic field, which comprises the following specific steps:
(1) firstly, mounting an induction coil clamp on a fixed plate, mounting an induction coil on the induction coil clamp, and adjusting the position of the fixed plate to enable the center point of the induction coil to be on the center line of a laser beam;
(2) fixing the 6061-T6 aluminum alloy base material with the surface pretreated on a base fixture, adjusting the 6061-T6 aluminum alloy base to be placed at a position 3mm below the induction coil, and locking the position;
(3) starting an alternating current source to input sine wave alternating current to the induction coil, wherein the currents of the medium-frequency magnetic field and the high-frequency magnetic field are respectively 50A and 100A, and the frequencies are respectively 50kHz and 100 kHz; opening a laser processing system, and setting required laser processing technological parameters including a spot diameter of 3mm, a wavelength of 1064nm, a pulse width of 10ns and pulse energy of 5J;
(4) preheating the base material by using a medium-frequency magnetic field generated by an induction coil until the temperature of the 6061-T6 aluminum alloy base material is 50 ℃, and reducing the internal stress; enabling the induction coil to generate a high-frequency magnetic field and laser shock waves to cooperatively work to impact the surface of the 6061-T6 aluminum alloy base material until the laser shock strengthening is finished;
(5) the motor servo system controls the base clamp to drive the base to move on the guide rail, and the whole machining process is completed.
As shown in fig. 2, under the condition of adding the pulse magnetic field, the residual compressive stress value and the residual stress depth of layer can be significantly increased.
As shown in FIG. 3, the medium frequency magnetic field provided by the pulsed magnetic field can generate induced current in the substrate to preheat the substrate material, and generate thermal coupling effect in the laser shock peening process to promote the microstructure evolution in the strain process to generate a deeper plastic deformation layer; the high-frequency magnetic field provided by the pulse magnetic field and the laser impact synchronously implement strong magnetic impact, under the condition of double impact, the surface of the base material cannot be additionally deformed macroscopically while a deeper residual stress layer is induced, the dislocation pinning phenomenon of the microstructure of the base body can be promoted, and the plastic deformation capability of the base material is enhanced.
Claims (8)
1. A device for assisting laser shock peening by a pulse magnetic field is characterized in that: the device comprises a laser processing system, an electromagnetic auxiliary system, a motor servo system, a guide rail and a base, wherein the guide rail is arranged on the base; the laser processing system comprises a laser generator, an external light path and a substrate clamp, wherein the external light path is positioned right above a substrate arranged on the substrate clamp; the electromagnetic auxiliary system comprises an alternating power supply, an induction coil clamp and a fixing plate, wherein one end of the induction coil clamp is fixed on the fixing plate, and the other end of the induction coil clamp is used for connecting the alternating power supply and the induction coil; the fixed plate is arranged on one side of the base, and the induction coil is positioned right above the base; the motor servo system is positioned on one side of the base and connected with the guide rail.
2. The device for pulsed magnetic field assisted laser shock peening according to claim 1, wherein: the induction coil is made of a copper tube with the wall thickness of 1mm and the diameter of 5 mm.
3. The device for pulsed magnetic field assisted laser shock peening according to claim 1, wherein: the induction coil anchor clamps comprise two L type right angle boards, and two L type right angle boards adopt bolt and nut to connect, and the L type right angle board that is located the top is installed on the fixed plate, and the L type right angle board that is located the below passes through bolt and nut with the insulation board on the induction coil to be fixed, drills on the L type right angle board of below, and induction coil passes through the wire with the alternating power and forms the electricity and be connected.
4. The device for pulsed magnetic field assisted laser shock peening according to claim 1, wherein: the substrate clamp and the induction coil clamp are made of low-density nonmagnetic epoxy resin materials.
5. A method for performing pulsed magnetic field assisted laser shock peening using the apparatus of claim 1, comprising the steps of:
(1) installing an induction coil clamp on a fixing plate, installing an induction coil on the induction coil clamp, and adjusting the position of the fixing plate to enable the center point of the induction coil to be on the center line of the laser beam;
(2) fixing a substrate to be processed by using a substrate clamp, and adjusting the position of the substrate to be positioned at a position 3-6mm below the induction coil to be locked;
(3) starting an alternating current source to input sine wave alternating current to the induction coil; opening a laser processing system and setting laser processing technological parameters;
(4) by adjusting the current, the induction coil firstly generates a medium-frequency magnetic field to preheat the base material, so that the internal stress is reduced; adjusting the current, and enabling the induction coil to generate a high-frequency magnetic field and laser shock waves to cooperatively work to impact the surface of the base material until the laser shock strengthening is finished;
(5) the motor servo system controls the base clamp to drive the base to move on the guide rail, and the whole machining process is completed.
6. The method of claim 5, wherein: in the step (3), the current range of the sine wave alternating current is 50-300A, and the frequency is 20-200 kHz; the laser processing technological parameters comprise 2-4mm of spot diameter, 1064nm of wavelength, 8-30ns of pulse width and 3-15J of pulse energy.
7. The method of claim 5, wherein: in the step (4), the preheating of the base material means that the temperature of the surface of the base material to be impacted reaches 50 ℃; and the magnetic induction intensity of the high-frequency magnetic field is 3-10T.
8. The method of claim 5, wherein: the induction coil is cooled by a water circulation cooling system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910783669.5A CN110791644A (en) | 2019-08-23 | 2019-08-23 | Device and method for pulsed magnetic field assisted laser shock peening |
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| CN201910783669.5A CN110791644A (en) | 2019-08-23 | 2019-08-23 | Device and method for pulsed magnetic field assisted laser shock peening |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111961836A (en) * | 2020-07-02 | 2020-11-20 | 江苏大学 | Device and method for strengthening composite of magnetic plasticity and laser shock |
| CN112877630A (en) * | 2021-01-08 | 2021-06-01 | 中南大学 | Method and device for strengthening aluminum alloy member by electromagnetic force room temperature circulation |
| CN114350932A (en) * | 2022-01-11 | 2022-04-15 | 西安交通大学 | Post-treatment method for solid solution-free precipitation-strengthened metal additive manufacturing thin-wall component |
| CN114737044A (en) * | 2022-03-29 | 2022-07-12 | 江苏大学 | Method and device for assisting laser shock peening through medium-frequency electromagnetic induction heating |
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| CN106148672A (en) * | 2016-08-18 | 2016-11-23 | 江苏大学 | A kind of method of additional variation magnetic field auxiliary laser shock peening |
| CN109811119A (en) * | 2019-03-12 | 2019-05-28 | 中国人民解放军空军工程大学 | A kind of laser temperature shot-blast unit |
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| US20030024904A1 (en) * | 2001-08-01 | 2003-02-06 | Allan H. Clauer | System for laser shock processing objects to produce enhanced stress distribution profiles |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111961836A (en) * | 2020-07-02 | 2020-11-20 | 江苏大学 | Device and method for strengthening composite of magnetic plasticity and laser shock |
| CN112877630A (en) * | 2021-01-08 | 2021-06-01 | 中南大学 | Method and device for strengthening aluminum alloy member by electromagnetic force room temperature circulation |
| CN112877630B (en) * | 2021-01-08 | 2022-05-24 | 中南大学 | Method and device for strengthening aluminum alloy member by electromagnetic force room temperature circulation |
| CN114350932A (en) * | 2022-01-11 | 2022-04-15 | 西安交通大学 | Post-treatment method for solid solution-free precipitation-strengthened metal additive manufacturing thin-wall component |
| CN114350932B (en) * | 2022-01-11 | 2023-03-10 | 西安交通大学 | Post-treatment method for solid solution-free precipitation-strengthened metal additive manufacturing thin-wall component |
| CN114737044A (en) * | 2022-03-29 | 2022-07-12 | 江苏大学 | Method and device for assisting laser shock peening through medium-frequency electromagnetic induction heating |
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Application publication date: 20200214 |