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Uniform surface strengthening method based on laser shock wave

A uniform surface, laser shock technology, applied in the field of surface strengthening treatment of metal materials, can solve problems such as low feasibility, and achieve the effect of eliminating residual stress holes and uniform residual stress distribution

Active Publication Date: 2020-04-28
SHANDONG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the realization of the above method needs to rely on higher performance laser equipment or rely on secondary processing, the feasibility is low

Method used

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  • Uniform surface strengthening method based on laser shock wave

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Experimental program
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Effect test

Embodiment 1

[0036] Depend on figure 1 As shown, the workpiece is 304 austenitic stainless steel material. A 3M adhesive tape with a thickness of 0.1mm was selected as the absorbing layer, and the parameters of the pulsed laser beam 1 used were: wavelength 1064nm, energy 6J, pulse width 18ns, circular beam with a diameter of 3mm. The second constrained layer 10 is a deionized water curtain with a thickness of 2.5 mm. The specific setting method is to change the flow rate of the water flow and the flow rate per unit area.

[0037] Using the above test parameters, the target metal material is subjected to single-point single-shot laser shock treatment, and the residual stress on the surface of the material is tested by X-ray diffraction method after the laser shock treatment is completed. The test conditions are: CrKβ target is used, the X-ray tube pressure and tube current are 26kV and 8mA respectively, and the counting time is 10s; in order to obtain a more accurate distribution trend, th...

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Abstract

The invention relates to a uniform surface strengthening method based on a laser shock wave. The uniform surface strengthening method based on the laser shock wave comprises the specific steps that anabsorption layer and a constraining layer are arranged on the surface of a workpiece sequentially in a clamped mode, a laser generator is arranged at a position opposite to the workpiece, the laser generator is located on the side close to the constraining layer of the workpiece, the workpiece is subjected to laser shock, the constraining layer is deionized water, and the thickness of a deionizedwater layer is 2-5 mm. The energy of the laser is 3-7J, the pulse width is 15-20ns, and the spot diameter is 1-4mm. The laser-induced "cavitation" effect is used for performing secondary strengthening on the workpiece to suppress or eliminate "residual stress holes" caused by the laser plasma shock wave on the surface of the workpiece, so that the residual stress is distributed on the surface ofthe workpiece uniformly.

Description

technical field [0001] The invention belongs to the technical field of metal material surface strengthening treatment, and in particular relates to a uniform surface strengthening method based on laser shock waves. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] The pulsed laser can cause a plasma explosion on the surface of the material, resulting in an impact pressure on the order of GPa. Based on this physical basis, researchers have developed advanced laser shock strengthening technology. However, during the laser shock process, a "residual stress hole" phenomenon often occurs on the target surface, that is, the geometric center of the laser beam has a small residual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D10/00
CPCC21D10/005
Inventor 卢国鑫
Owner SHANDONG UNIV
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