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Method for forming nanometer gradient structure on surface layer of shaft metallic material

A technology of metal material and gradient structure, which is applied in the field of processing where plastic deformation occurs on the surface of the material, can solve the problems of large surface roughness, poor surface finish, and difficulty in forming nano-crystal structures on the surface of the workpiece, and achieve low surface roughness, The processing method is simple and the force is uniform

Active Publication Date: 2012-08-22
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a surface treatment method that uses cemented carbide balls to plastically deform the surface of the shaft metal material to form a nano-gradient structure, so as to solve the problem of relatively large surface roughness and poor surface finish of the processed material in the prior art. Good, it is difficult to form nano-crystal structure on the surface of the workpiece, etc.

Method used

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  • Method for forming nanometer gradient structure on surface layer of shaft metallic material
  • Method for forming nanometer gradient structure on surface layer of shaft metallic material
  • Method for forming nanometer gradient structure on surface layer of shaft metallic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Utilize processing method of the present invention to process 316L stainless steel:

[0035] Equipment: CNC lathe;

[0036] 316L stainless steel diameter: 12mm in diameter;

[0037] Spindle (processed workpiece) speed: line speed 300 mm / s;

[0038] Each feeding amount: 30 microns / time;

[0039] Axial feed speed: 20mm / min;

[0040] Ball diameter: 8 mm;

[0041]Deformation temperature: room temperature;

[0042] Processing times: 6 times;

[0043] The grain size of 316L stainless steel before processing is 2-3 microns.

[0044] 316L stainless steel after treatment such as figure 1 As shown, the surface microstructure is as figure 2 , image 3 , Figure 4, the thickness of the deformed layer after processing is about 200 microns, and the deformed layer is a nano-gradient structure. grain structure.

[0045] Wherein, the thickness of the nanometer layer is 30 micrometers, the thickness of the submicrometer layer is 100 micrometers, and the thickness of the deform...

Embodiment 2

[0047] Utilize processing method of the present invention to process metallic nickel:

[0048] Equipment: CNC lathe;

[0049] Metal nickel diameter: 6mm in diameter;

[0050] Spindle speed: line speed 100 mm / s;

[0051] Each feeding amount: 30 microns / time;

[0052] Axial feed speed: 6mm / min;

[0053] Ball diameter: 8 mm;

[0054] Deformation temperature: room temperature;

[0055] Processing times: 15 times;

[0056] The grain size of metallic nickel before processing is 20-40 microns.

[0057] The thickness of the deformed layer after processing is about 210 microns (see Figure 9 ), the deformed layer is a nano-gradient structure, and the grain size of the surface layer of the workpiece material is nano-sized grains, sub-micron-sized grains, deformed grains and initial grains in sequence from the surface to the inside. Wherein, the thickness of the nanometer layer is about 5 microns, the thickness of the submicron layer is about 80 microns, and the thickness of the ...

Embodiment 3

[0059] Use the processing method of high-speed plastic deformation on the surface to process the steel shaft of brand Z5CND16-4 (French stainless steel heat-resistant steel):

[0060] Equipment: CNC lathe;

[0061] Steel shaft diameter: 120mm;

[0062] Spindle speed: line speed 100 mm / s;

[0063] Each feeding amount: 20 microns / time;

[0064] Axial feed speed: 16mm / min;

[0065] Ball diameter: 8 mm;

[0066] Deformation temperature: room temperature;

[0067] Processing times: 6 times;

[0068] The Z5CND16-4 steel shaft grain size before processing is 250 nanometers.

[0069] Surface structure refinement after treatment (such as Figure 5 ), the thickness of the deformed layer after processing is about 160 microns, the deformed layer is a nano-gradient structure, and the grain size of the surface layer of the workpiece material is nano-sized grains, sub-micron-sized grains, deformed grains and initial grains in sequence from the surface to the inside organize.

[0070...

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Abstract

The invention relates to a surface treatment method for forming a nanometer gradient structure on a surface layer of a shaft metallic material. The invention aims to solve the problems that the surface roughness of the material to be treated is higher, the surface smoothness is not high and a nanometer crystal structure is difficult to form on the surface of a workpiece in the prior art. A spherical treatment tool is adopted to roll on the surface of the rotary shaft metallic material, and meanwhile, the spherical treatment tool moves along the axial direction of the workpiece, and plastic deformation is generated on the surface layer of the material, so that grains on the surface layer of a workpiece material are refined to form the nanometer gradient structure, wherein the depth of the deformation layer of the nanometer gradient structure reaches 100-300 micrometers; and the grains on the surface layer of the workpiece material are nanometer grains, submicron grains, deformation grains and initial grains in sequence in size from the surface to the inside. According to the processing method provided by the invention, the integral mechanical property of the material is improved through improving the microstructure of the surface layer, thereby, the service life of the material is prolonged. The processing method provided by the invention is small in investment and is simple and convenient in operation.

Description

technical field [0001] The invention relates to a surface treatment technology for forming a nanometer gradient structure on the surface of a shaft-like metal material, and in particular provides a processing method for producing plastic deformation on the surface of the material, so that the grain size of the surface layer of the material is sequentially from the surface to the inside of nano-sized grains, sub-micron Size grains, deformed grains and initial grain structure. Background technique [0002] At present, the methods for forming gradient structures on the surface of shaft-like metal materials mainly include: [0003] ① Surface mechanical grinding treatment method [0004] The surface mechanical grinding treatment method is to hit the surface of the material being treated by a high-speed moving projectile, resulting in strong plastic deformation on the surface of the material and introducing a large number of defects, such as dislocations, twins, shear bands, etc....

Claims

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Application Information

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IPC IPC(8): C21D7/04
Inventor 斯晓陶乃镕卢柯
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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