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Method for modifying high-toughness surfaces of metal materials

A metal material and surface modification technology, which is applied in the field of high-strength and toughening surface modification of metal materials, can solve the problem of not being able to achieve a good match between strength and plastic toughness, and achieve the goal of improving the surface quality of materials, reducing quenching deformation, and improving strength and toughness. Effect

Active Publication Date: 2014-03-19
常熟市通顺纺织有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the magnetic field is an important condition for improving the strength and toughness of materials, and its combination with the existing surface modification technology can develop into a new type of surface modification method for strengthening and toughening, which overcomes the shortcomings of the existing technology that cannot achieve a good match between strength and plastic toughness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Grinding, polishing, cleaning and drying the surface of the metal material aluminum alloy;

[0025] 2) The surface of the pretreated material is subjected to laser peening treatment, and the laser power density is 10GW / cm 2 , the laser pulse width is 40ns, the spot diameter is 8mm, and the overlap rate is 20%;

[0026] 3) Carry out magnetic field nitriding under 0.1T AC magnetic field on the surface treated by laser peening;

[0027] 4) The surface after nitriding is subjected to magnetic field quenching under a constant magnetic field of 15T, and the quenching medium is water;

[0028] 5) The surface after magnetic field quenching is subjected to low-energy laser peening treatment, and the laser power density is 4GW / cm 2 , the spot diameter is 5mm;

[0029] 6) The surface treated by low-energy laser shot peening is subjected to magnetic field quenching again under a 10T constant magnetic field, and the quenching medium is water to obtain a flat, high-strength and...

Embodiment 2

[0032] 1) Grinding, polishing, cleaning and drying the surface of the metal material high-alloy steel;

[0033] 2) The surface of the pretreated material is subjected to laser peening treatment, and the laser power density is 1GW / cm 2 , the laser pulse width is 5ns, the spot diameter is 1mm, and the overlap rate is 40%;

[0034] 3) Perform magnetic field nitriding on the surface treated by laser shot peening under a constant and stable magnetic field of 15T;

[0035] 4) The surface after nitriding is subjected to magnetic field quenching under a 2T pulsed magnetic field, and the quenching medium is ice water;

[0036] 5) The surface after magnetic field quenching is subjected to low-energy laser peening treatment, and the laser power density is 0.8GW / cm 2 , the spot diameter is 0.5mm;

[0037] 6) The surface treated by low-energy laser peening is subjected to magnetic field quenching again under a 0.7T AC magnetic field, and the quenching medium is water to obtain a flat, h...

Embodiment 3

[0040] 1) Grinding, polishing, cleaning and drying the surface of the metal material titanium alloy;

[0041] 2) The surface of the pretreated material is subjected to laser peening treatment, and the laser power density is 7GW / cm 2 , the laser pulse width is 25ns, the spot diameter is 10mm, and the overlap rate is 80%;

[0042] 3) Carry out magnetic field nitriding on the surface treated by laser shot peening under a constant magnetic field of 5T;

[0043] 4) The surface after nitriding is subjected to magnetic field quenching under a constant magnetic field of 10T, and the quenching medium is liquid nitrogen;

[0044] 5) The surface after magnetic field quenching is subjected to low-energy laser peening treatment, and the laser power density is 3GW / cm 2 , the spot diameter is 6mm;

[0045] 6) The surface treated by low-energy laser shot peening is subjected to magnetic field quenching again under a 5T constant magnetic field, and the quenching medium is ice water to obtain ...

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Abstract

The invention discloses a method for modifying the high-toughness surfaces of metal materials, relating to a surface modification technique for materials. The method comprises the following main steps: 1) pretreating the surface of a metal material; 2) carrying out laser shot blasting treatment on the pretreated surface of the material; 3) carrying out magnetic field nitriding on the surface subjected to laser shot blasting treatment; 4) carrying out magnetic field quenching on the surface subjected to nitriding; 5) carrying out low-energy laser shot blasting treatment on the surface subjected to magnetic field quenching; 6) carrying out magnetic field quenching again on the surface subjected to low-energy laser shot blasting treatment, so that a flat high-toughness surface is obtained. According to the invention, the grain structure of a surface can be effectively refined, the thickness of a nitriding layer can be increased, the nitriding time can be shortened, the brittleness of the nitriding layer can be reduced, and the toughness of the surface can be improved. The method disclosed by the invention is simple in technological process, easy in operation, high in efficiency, and suitable for mass production in a large scale.

Description

[0001] technical field [0002] The invention relates to the technical field of surface modification of metal materials, in particular to a method for surface modification of metal materials with high strength and toughness. Background technique [0003] The failure of metal parts often originates from its surface, such as corrosion, wear, fatigue and other damages all start or occur on the surface. Therefore, improving surface properties has become an important method to prevent component failure and prolong its service life. Surface modification technology is an effective means to improve the surface properties of materials. It achieves the purpose of improving the surface properties of materials by improving the composition and microstructure of the material surface. At present, the most widely used surface modification technologies include laser surface modification, nitriding, carburizing, spraying, vapor deposition and other methods, but these methods usually make the...

Claims

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Application Information

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IPC IPC(8): C23F17/00
Inventor 崔承云崔熙贵周建忠许晓静张洁
Owner 常熟市通顺纺织有限责任公司
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