Method for improving laser plasma shock wave pressure through magnetic and electric fields

Abstract

The invention relates to a method for improving laser plasma shock wave pressure through strong magnetic fields and electric fields so as to strengthen material surfaces. The method has obvious effect of improving the shock wave pressure and particularly plays an important role of restraining the magnetic fields and electric fields when complicated workpieces are used and a water restraint layer is not applied stably. Compared with a conventional method, in the method disclosed by the invention, the magnetic field acts on the whole plasma group and acts with each charged particle, so that the movement velocity of electrons is accelerated, the plasma reaction is aggravated and the laser energy absorption effect of the plasmas is improved; and moreover, through regulating the directions of the magnetic fields and electric fields, the Lorentz forces of the charged particles direct to workpiece surfaces, the plasmas can be restrained from expanding towards the laser incident direction, and the shock wave pressure is increased.

Description

technical field [0001] The invention relates to the fields of surface engineering technology and laser processing, in particular to a method for enhancing the pressure of a laser plasma shock wave by using a strong magnetic field and an electric field to intensify the treatment of the surface of a material. Background technique [0002] Laser shock peening / processing (LSP) is a new type of surface strengthening technology, which uses laser shock waves to modify the surface of materials to improve the properties of materials such as fatigue resistance, wear resistance and stress corrosion resistance. [0003] In laser shock peening, the laser-induced plasma shock wave pressure is the key to material strengthening. In engineering, a water confinement layer is often used to constrain the expansion of the plasma to increase the peak pressure of the shock wave. However, in some complex components, the flow rate of the water confinement layer, Parameters such as uniformity and thi...

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Problems solved by technology

[0003] In laser shock strengthening, the plasma shock wave pressure induced by laser is the key to material strengthening. In engineering, water confinement layer is often used to constrain the expansion of plasma to increase the peak pressure of shock wave. However, in some complex components, the flow rate of water confinement layer, Parameters such as uniformity and thickness are difficult to guarantee, which will directly affect the strengthening quality

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