AU2019101687A4

AU2019101687A4 - Material strenthening device and method for coupling underwater particle cavitation

Info

Publication number: AU2019101687A4
Application number: AU2019101687A
Authority: AU
Inventors: Chengqiang LIU; Lei Liu; Qian Wang; Ping Yu
Original assignee: Xuzhou University of Technology
Current assignee: Xuzhou University of Technology
Priority date: 2019-11-12
Filing date: 2019-12-23
Publication date: 2020-02-13
Anticipated expiration: 2027-12-23
Also published as: CN110777250A

Abstract

Disclosed is a material strengthening device for coupling underwater particle cavitation, comprising a laser, a lens array, a water tank, a target and a three-dimensional mobile platform, wherein a laser beam formed by the laser emitted by the laser passing through the lens array is 5 focused on the target, the target is placed on a stage in the water tank, and the water tank is disposed on a three-dimensional mobile platform; the laser beam is perpendicular to the target, and a focus of the laser beam is in a strengthening liquid filled in the water tank. Further, disclosed is a material strengthening method for coupling underwater particle cavitation, comprising steps of: setting a power of the laser, installing the lens array, turning on the laser, 0 adjusting a distance between the focus of the laser beam and the target, and making the focus to be perpendicular to the target; activating the three-dimensional mobile platform to make it move along a set route and make the water tank to perform the same movement, so that the focus induces a particle cavitation at different positions of the target to perform impacting and strengthening on the target. The device has a simple structure, is easy to operate, and can meet 5 the strengthening requirements for light alloy materials; the strengthening method enables strengthening of light alloy materials. 8 - - - -*-- Fig. 1

Description

MATERIAL STRENTHENING DEVICE AND METHOD FOR COUPLING UNDERWATER PARTICLE CAVITATION

FIELD

The disclosure relates to a material strengthening device and method, in particular, to a 5 material strengthening device and method for coupling underwater particle cavitation, which belongs to the technical field of material surface strengthening.

BACKGROUND

Under the current development trend of energy conservation, consumption reduction and emission reduction, light alloys, as the lightest density metal materials, are one of the most 0 promising metal materials. In recent years, with the continuous development of research and development technology, light alloy materials not only play an important role in the research and development of aerospace, weapons and equipment, but also widely used in civilian products such as automobiles, communication equipment, and electronic products. Although light alloy materials have been unprecedentedly developed in terms of the performance indicators, the 5 problem of low absolute strength still exists, which has limited the application of light alloy materials to a certain extent.

The existing material strengthening method for alloys mainly includes using a laser to act on a liquid, penetrating the liquid to generate a plasma cavity when the laser energy reaches a penetration threshold of the liquid medium, then the plasma cavity continuing to absorb laser :0 energy and expanding rapidly to form a cavitation, which will produce a wall-trending effect due to the pressure difference when moving near the solid-liquid interface, so that shock waves and water jets accompanying the cavitation pulsation collapse process will in turn forms a mechanical effect on the material surface. Although the strengthening method can increase the strength of the alloy material to a certain extent, the strengthening effect is not ideal.

SUMMARY

For the problems in prior art, the present disclosure provides a material strengthening device and method for coupling underwater particle cavitation. The device has a simple structure, is easy to operate, and can meet the strengthening requirements for light alloy materials; the strengthening method enables strengthening of light alloy materials to significantly increase the 30 absolute strength.

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2019101687 23 Dec 2019

To achieve above purpose, the present disclosure provides a material strengthening device for coupling underwater particle cavitation, comprising a laser, a lens array, a water tank, a target and a three-dimensional mobile platform, wherein a laser beam formed by a laser emitted by the laser passing through the lens array is focused on the target, the target is placed on a stage in the 5 water tank, and the water tank is disposed on a three-dimensional mobile platform;

the laser beam is perpendicular to the target, and a focus of the laser beam is in a strengthening liquid filled in the water tank; a distance between the focus and an upper surface of the target is 0.1mm to 2 mm, and the strengthening liquid is prepared by uniformly mixing silicon carbide particles of 10 nm to 100 nm and water at a mass ratio of 1: 100 to 1: 200.

Further, the lens array, with the laser as a starting point, includes a concave lens, a convex lens, a full reflection mirror, and a focusing lens in order from near to far.

Further, the laser beam is a high-energy laser that is greater than 1500 mj; the target is a light alloy; the silicon carbide particles are hard ceramic powders; the water tank is made of resin plastic or glass; the water is tap water or purified water.

A material strengthening method for coupling underwater particle cavitation, comprising steps of:

(1) mixing the strengthening liquid in the water tank with silicon carbide particles of 10 nm to 100 nm and water in a ratio of 1: 100 to 1: 200;

setting a power of the laser, installing the lens array, turning on the laser, adjusting a distance between the focus of the laser beam and an upper surface of the target, and keeping the focus perpendicular to a surface of the target;

(2) activating the three-dimensional mobile platform to make it move along a set route and make the water tank disposed at an upper end thereof to perform the same movement accordingly, so that the focus induces a particle cavitation at different positions of the target to perform impacting and strengthening on the target.

Further, the lens array in the step (1), with the laser as a starting point, includes a concave lens, a convex lens, a full reflection mirror, and a focusing lens in order from near to far.

2019101687 23 Dec 2019

Further, the laser beam in the step (1) is a high-energy laser that is greater than 1500 mJ; a distance between the focus and the target is 1 mm; the strengthening liquid is prepared by uniformly mixing silicon carbide particles of 20 nm and water at a ratio of 1: 100.

Further, in the step (2), when the particle cavitation performs impacting and strengthening 5 on the target, the silicon carbide particles hit the target at a speed of more than 150 m/s.

Further, in the step (2), a route in which the target moves in the water tank is a continuous distribution between a positive U-shape and an inverted U-shape.

In the disclosure, by focusing the laser beam into the strengthening liquid in the water tank through the lens array, the high-energy laser generates a cavitation group at the focus, and the 0 cavitation has a large amount of energy, so as to produce large speeds and pressures; the silicon carbide nanoparticles uniformly mixed in the strengthening liquid are enveloped by cavitation, so that the cavitation collapses when the cavitation is wrapped with nanoparticles for impacting the target at a high speed, and a temperature of more than 1500 °C is generated at the collapsing region to rapidly heat and heat-dissipate the target for forming residual thermal stress layers, 5 thereby realizing the strengthening of the target; and the device has a simple structure, is easy to operate, and can meet the strengthening requirements for light alloy materials, so as to significantly increase the absolute strength.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig 1 is a structural diagram of the disclosure;

Fig. 2 is a diagram showing a relative movement route of a focus of a laser beam on a surface of a target.

In figures: 1 laser, 2 lens array, 3 water tank, 4 target, 5 three-dimensional mobile platform, 6 laser beam, 7 stage, 8 focus, 9 strengthening liquid, 10 silicon carbide particles, 11 concave lens, 12 convex lens, 13 full reflection mirror, 14 focusing lens, 15 particle cavitation.

DETAILED DESCRIPTION

The present invention will be further elaborated hereafter in connection with the drawings.

As shown in Fig. 1, a material strengthening device for coupling underwater particle cavitation includes a laser 1, a lens array 2, a water tank 3, a target 4 and a three-dimensional

2019101687 23 Dec 2019 mobile platform 5, wherein a laser beam 6 formed by a laser emitted by the laser 1 passing through the lens array 2 is focused on the target 4, the target 4 is placed on a stage 7 in the water tank 3, and the water tank 3 is disposed on a three-dimensional mobile platform 5;

the laser beam 6 is perpendicular to the target 4, and a focus 8 of the laser beam 6 is in a strengthening liquid 9 filled in the water tank 3; a distance between the focus 8 and an upper surface of the target 4 is 0.1 mm to 2 mm, and the strengthening liquid 9 is prepared by uniformly mixing silicon carbide particles 10 of 10 nm to 100 nm and water at a mass ratio of 1: 100 to 1: 200.

The lens array 2, with the laser 1 as a starting point, includes a concave lens 11, a convex 0 lens 12, a full reflection mirror 13, and a focusing lens 14 in order from near to far.

In order to make a temperature of the particle cavitation 15 generated by the laser beam 6 in the strengthening liquid 9 meet the strengthening requirement, the laser beam 6 is a high-energy laser that is greater than 1500 mj;

the target 4 is a light alloy;

preferably, the silicon carbide particles 10 are hard ceramic powders; the water tank 3 is made of resin plastic or glass; the water is tap water or purified water.

The three-dimensional mobile platform 5 in the application may be a mobile platform that may meet the requirements in movement in the prior art, that is, the three-dimensional mobile platform 5 drives the water tank 3 to move simultaneously or separately in the X direction (i.e., 20 in the longitudinal direction), the Y direction (i.e., in the vertical direction), and the Z direction (i.e., in the axial direction).

(1) mixing the strengthening liquid 9 in the water tank 3 with silicon carbide particles 10 of 25 10 nm to 100 nm and water in a mass ratio of 1: 100 to 1: 200;

setting a power of the laser, installing the lens array 2, turning on the laser 1, adjusting a distance between the focus of the laser beam 6 and the target 4, and keeping the focus 8

2019101687 23 Dec 2019 perpendicular to a surface of the target 4;

(2) activating the three-dimensional mobile platform 5 to make it move along a set route and make the water tank 3 disposed at an upper end thereof to perform the same movement accordingly, so that the focus 8 induces a particle cavitation 10 at different positions of the target 5 4 to perform impacting and strengthening on the target 4.

In the step (1), the lens array 2, with the laser 1 as a starting point, includes a concave lens 11, a convex lens 12, a full reflection mirror 13, and a focusing lens 14 in order from near to far.

In order to make a temperature of the particle cavitation 15 generated by the laser beam 6 in the strengthening liquid 9 meet the strengthening requirement, the laser beam 6 in the step (1) is 0 a high-energy laser that is greater than 1500 mj, and the distance between the focus 8 and the target 4 is 1 mm.

The strengthening liquid 9 is prepared by uniformly mixing the silicon carbide particles 10 of 20 nm with water in a mass ratio of 1: 100, which facilitates providing combined particles for the cavitation.

To achieve better strengthening effects, in the step (2), when the particle cavitation 15 performs impacting and strengthening on the target, the silicon carbide particles 10 hit the target 4 at a speed of more than 150 m/s.

As shown in Fig. 2, to ensure the target 4 to be comprehensively and uniformly strengthened, in the step (2), a route in which the target 4 moves in the water tank 3 is a continuous distribution 20 between a positive U-shape and an inverted U-shape.

Embodiments:

A magnesium-aluminum alloy, used as a test target, is measured for its properties before strengthening, applied with a 2N load, and has an obtained surface micro Vickers hardness of 75.2HV;

The magnesium aluminum alloy is strengthened according to the material strengthening method in the application; again, the strengthened magnesium aluminum alloy is measured for its properties, applied with a 2N load, and has an obtained surface micro Vickers hardness of

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148.7HV on the premise that other properties are not reduced, so that the absolute strength of light alloy materials s significantly increased.

In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the word 5 “comprise” or variations such as “comprises” or “comprising” is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention.

Claims

(1) mixing the strengthening liquid (9) in the water tank (3) with silicon carbide particles (10) of 10 nm to 100 nm and water in a mass ratio of 1: 100 to 1: 200;

setting a power of the laser, installing the lens array (2), turning on the laser (1), adjusting a

25 distance between the focus (8) of the laser beam (6) and the target (4), and keeping the focus (8) perpendicular to a surface of the target (4);

1. A material strengthening device for coupling underwater particle cavitation, comprising a laser (1), a lens array (2), a water tank (3), a target (4) and a three-dimensional mobile platform (5), wherein a laser beam (6) formed by a laser emitted by the laser (1) passing through the lens

5 array (2) is focused on the target (4), the target (4) is placed on a stage (7) in the water tank (3), and the water tank (3) is disposed on a three-dimensional mobile platform (5);

wherein the laser beam (6) is perpendicular to the target (4), and a focus (8) of the laser beam (6) is in a strengthening liquid (9) filled in the water tank (3); a distance between the focus (8) and an upper surface of the target (4) is 0.1mm to 2 mm, and the strengthening liquid (9) is 0 prepared by uniformly mixing silicon carbide particles (10) of 10 nm to 100 nm and water at a mass ratio of 1: 100 to 1: 200.
(2) activating the three-dimensional mobile platform (5) to make it move along a set route and make the water tank (3) disposed at an upper end thereof to perform the same movement

2019101687 23 Dec 2019 accordingly, so that the focus (8) induces a particle cavitation (15) at different positions of the target (4) to perform impacting and strengthening on the target (4).

2. The material strengthening device for coupling underwater particle cavitation according to claim 1, wherein the lens array (2), with the laser (1) as a starting point, comprises a concave lens (11), a convex lens (12), a full reflection mirror (13), and a focusing lens (14) in order from

5 near to far.
3. The material strengthening device for coupling underwater particle cavitation according to claim 1 or 2, wherein the laser beam (6) is a high-energy laser that is greater than 1500 mj; the target (4) is a light alloy; the silicon carbide particles (10) are hard ceramic powders; the water tank (3) is made of resin plastic or glass; the water is tap water or purified water.

20
4. A material strengthening method for coupling underwater particle cavitation, comprising steps of:
5. The material strengthening method for coupling underwater particle cavitation according to claim 4, wherein the laser beam (6) in the step (1) is a high-energy laser that is greater than 5 1500 mJ; a distance between the focus (8) and the target (4) is 1 mm; the strengthening liquid (9) is prepared by uniformly mixing silicon carbide particles (10) of 20 nm and water at a mass ratio of 1: 100.