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Metal material idler wheel type surface nanocrystallization method

A metal material and nanotechnology, which is applied in the field of metal material roller-type surface nanotechnology, can solve the problems of increased surface roughness, limited SMAT processing efficiency, and restrictions on the application field of SMAT surface nanotechnology technology, and achieves low cost and high realization method simple effect

Inactive Publication Date: 2016-11-09
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the efficiency of SMAT treatment is limited, and the surface roughness Ra of metal materials increases significantly after SMAT treatment, which limits the application field of SMAT surface nanotechnology.

Method used

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  • Metal material idler wheel type surface nanocrystallization method
  • Metal material idler wheel type surface nanocrystallization method
  • Metal material idler wheel type surface nanocrystallization method

Examples

Experimental program
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Embodiment 1

[0035] In this embodiment, 316L austenitic stainless steel is selected as the object, and its chemical composition is (wt.%): C 0.03%, Si0.03%, Mn 1.01%, S 0.016%, P 0.042%, Cr 16.72%, Mo 2.12% , Ni 10.7%, Fe balance. The supply state of 316L austenitic stainless steel is annealed state, and the diameter of the test rod is 10mm. The surface of the test bar is in the state of turning processing.

[0036] The surface nanometerization processing of 316L austenitic stainless steel is carried out by adopting the roller type surface nanometerization method of the present invention. The roller material of the roller-type surface nano-processing tool is GCr15, the diameter of the roller is 30mm, and the diameter of the end surface of the roller 3 is 10mm. 316L austenitic stainless steel test rod rotation speed v 1 =1.7×10 4 mm / min; tool feed speed v for roller-type surface nano-processing 2 =5×10 -3 mm / r; the depth Δx of the end of the roller pressed into the surface of 316L aus...

Embodiment 2

[0039] This embodiment selects IF steel as the object, and its chemical composition is (wt.%): C 0.04%, Si 0.04%, Mn0.29%, S 0.003%, P 0.04%, Ti 0.01%, Ni 0.02%, Cu 0.03 %, Al 0.03%, Fe balance. The supply state of IF steel is annealed state, and the diameter of the test rod is 20mm. The surface of the test bar is in the state of turning processing.

[0040] The surface nanometerization process of the IF steel is carried out by adopting the roller type surface nanometerization method of the present invention. The roller material of the roller-type surface nano-processing tool is GCr15, the diameter of the roller is 30mm, and the diameter of the end surface of the roller 3 is 10mm. IF steel test rod rotation speed v 1 =1.7×10 4 mm / min; tool feed speed v for roller-type surface nano-processing 2 =7×10 -3 mm / r; the depth Δx of the end of the roller pressed into the IF steel surface 1 =25μm, Δx 2 =25μm, Δx 3 = 50 μm.

[0041] The experimental results show that after the ...

Embodiment 3

[0043] This embodiment selects 42CrMoA quenched and tempered steel as the object, and its chemical composition is (wt.%): C 0.41%, Si0.23%, Mn 0.75%, S 0.024%, P 0.015%, Cr 1.12%, Mo 0.22%, Cu 0.02%, Fe balance. The supply state of 42CrMoA quenched and tempered steel is the quenched and tempered state (quenching, high temperature tempering treatment and aging treatment in sequence), and the diameter of the test rod is 20mm. The surface of the test bar is in the state of turning processing.

[0044] The surface nanometerization process of 42CrMoA quenched and tempered steel is carried out by adopting the roller type surface nanometerization method of the present invention. The roller material of the roller-type surface nano-processing tool is GCr15, the diameter of the roller is 30mm, and the diameter of the end surface of the roller 3 is 10mm. 42CrMoA quenched and tempered steel test rod rotation speed v 1 =1.9×10 4 mm / min; tool feed speed v for roller-type surface nano-pr...

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Abstract

The invention discloses a metal material idler wheel type surface nanocrystallization method and belongs to the technical field of metal material surface nanocrystallization. According to the method, an idler wheel type surface nanocrystallization processing system is adopted to treat a metal material rotating member, and the surface of a metal material generates gradient plastic deformation under the controllable rolling action of an idler wheel, so that a gradient structure refinement layer is generated on the surface of the material; the depth of the gradient structure refinement layer can reach 800 mum to the maximum; an organizational structure on the upmost surface layer is converted into a nanocrystalline structure from a coarse-grain structure. Through idler wheel type surface nanocrystallization treatment, the surface smoothness of the metal material is improved to different extents, the harness of the surface layer changes in a gradient manner from the exterior to interior, and the surface hardness value is remarkably increased compared with the matrix hardness value.

Description

technical field [0001] The invention relates to the technical field of metal material surface nanometerization, in particular to a metal material roller type surface nanometerization method. Background technique [0002] The main forms of damage to engineering metal materials and devices in the service environment include fatigue failure, corrosion failure and wear failure, etc., and these failures are directly related to the surface structure and performance of the material. Therefore, improving the surface properties of metal materials and devices will greatly improve their service behavior and service life. The existing methods to improve the surface properties of metal materials mainly include surface deposition coating, surface alloying, surface mechanical treatment and so on. The surface deposition coating method is to prepare a coating with special properties on the surface of the metal material by means of vapor deposition or spraying to adapt to the complex service...

Claims

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Application Information

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IPC IPC(8): C21D7/04
CPCC21D7/04C21D2201/03
Inventor 张伟华王镇波卢柯梁晨张凯
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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