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Method and device for strengthening metal material through pulse current coupled laser peening

A metal material, laser peening technology, applied in the field of metal material strengthening, can solve the problem of small compressive stress amplitude, achieve the effect of increasing amplitude and depth, excellent comprehensive mechanical properties, tensile strength and elongation

Pending Publication Date: 2021-05-28
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the amplitude of residual compressive stress induced by electric pulse treatment is small, which is not conducive to greatly improving the mechanical properties of metal materials such as fatigue resistance and corrosion resistance.

Method used

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  • Method and device for strengthening metal material through pulse current coupled laser peening
  • Method and device for strengthening metal material through pulse current coupled laser peening

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Experimental program
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Effect test

Embodiment 1

[0024] A method for pulsed current coupling laser shot peening strengthening of metal materials, comprising the following steps:

[0025] (a) Grinding and polishing the surface of the metal material, and finally carrying out ultrasonic cleaning in industrial alcohol solution and drying for subsequent use;

[0026] (b) Under different process parameters, use the positive and negative electrodes to apply current to the surface of the pretreated sample for electric pulse treatment; take the maximum yield strength and elongation at break of the sample as the optimization target, and use the response surface optimization method to determine the The optimal electric pulse treatment process parameters; wherein, the electric pulse treatment process parameters are: pulse frequency 50-5000Hz, peak current 50-50000A, pulse width 20-2000μs, pulse time 10-600s;

[0027] (c) Under the optimal process parameters, the sample is subjected to electric pulse treatment, and the sample is tested w...

Embodiment 2

[0033] In this embodiment, the metal material is a TC4 titanium alloy plate, and the device and method of Embodiment 1 are used to process the material, and the coupling effect of the electroplastic deformation caused by pulse current and the ultra-high strain rate plastic deformation induced by laser shot peening is improved. The amplitude and depth of residual compressive stress can be adjusted to obtain more excellent comprehensive mechanical properties.

[0034] The method for the pulse current coupling laser shot peening strengthening metal material, may further comprise the steps:

[0035] (a) Grinding and polishing the surface of the TC4 titanium alloy plate, and finally carrying out ultrasonic cleaning in industrial alcohol solution and drying for subsequent use;

[0036] (b) Under different process parameters, use the positive and negative electrodes to apply current to the surface of the pretreated sample for electric pulse treatment; take the maximum yield strength ...

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Abstract

The invention discloses a method and device for strengthening a metal material through pulse current coupling laser peening, and belongs to the technical field of metal material strengthening. The method comprises the following steps of (a) pretreating the surface of the metal material; (b) determining optimal electric pulse treatment process parameters of a test sample; (c) testing the test sample by utilizing a Hopkinson pressure bar to obtain the dynamic yield strength of the metal material in the electric pulse treatment process; (d) solving the Hugoniot elastic limit of the metal material, and further obtaining the optimal laser power density of the test sample; and (e) in the electric pulse treatment process, performing laser peening strengthening treatment on the test sample by a Nd:YAG solid laser in the optimal laser power density range at the same time. Through the coupling effect of electroplastic deformation caused by electric pulses and ultrahigh-strain-rate plastic deformation induced by laser peening, the amplitude and depth of residual compressive stress are improved, and more excellent comprehensive mechanical properties are obtained.

Description

technical field [0001] The invention belongs to the technical field of strengthening metal materials, and in particular relates to a method and a device for strengthening metal materials by pulse current coupling laser shot peening. Background technique [0002] Metal materials are an important symbol of human civilization and have been widely used in all walks of life. However, under the action of alternating loads, although the stress level is lower than the yield strength of metal materials, after long-term stress cycles, fatigue fractures will occur, resulting in huge safety accidents and economic losses. Therefore, how to improve the comprehensive mechanical properties of metallic structural parts has important engineering significance. [0003] Deformation strengthening technology is one of the most effective methods to prolong the fatigue life of structural parts by changing the microstructure of the material surface and inducing high-amplitude residual compressive s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D10/00
CPCC21D10/00C21D10/005
Inventor 李京刘麟张颖刘文明刘雪东张智宏彭剑
Owner CHANGZHOU UNIV
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