Laser phase change reinforcing method to reinforce gradient structure

A technology of phase transformation strengthening and gradient structure, which is applied in the field of laser heat treatment, can solve problems such as difficult to meet heat treatment requirements, and achieve the effect of heavy load wear resistance, good wear resistance, and excellent wear resistance

Inactive Publication Date: 2003-03-19
SHANGHAI UNIV OF ENG SCI
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AI Technical Summary

Problems solved by technology

[0002] As a new technology of accurate local surface heat treatment, laser heat treatment has good strengthening effect and small deformation. However, so far, laser heat treatment is mostly based on the test of hardened layer depth and microhardness, whether the treated layer has defects and performance tests. When selecting process parameters, it is difficult to meet the heat treatment requirements under harsh service conditions under the premise that the base material cannot be selected arbitrarily

Method used

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Examples

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Embodiment Construction

[0010] The present invention will be described in detail below by taking the laser phase transformation strengthening process of the upper and lower guide seats of the hydraulic shock absorber of the speed-increasing train as an example.

[0011] The main parts of the hydraulic shock absorber for speed-increasing trains - the upper and lower guide seats have high machining accuracy requirements, and must bear vertical vibration, lateral swing and longitudinal swing at the same time during use. The positive pressure amplitude of the upper and lower guide seats in the vertical excitation reaches 1000 kg, and the frequency of force value changes with the vertical excitation frequency. Under the action of the positive pressure, the surfaces of the upper and lower guide seats are also displaced along with the shock absorber due to horizontal and vertical swings. The compression displacement between the two under the action of the positive pressure is the cause of the wear on the su...

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Abstract

The present invention relates to laser heat treatment technology. The laser phase change reinforcing method to control phase change and reinforce gradient structure includes the steps of: designing phase change reinforcing gradient structure of workpiece; performing proper heat treatment, usually tempering, of the workpiece; coating nano absorbing oxide paint; selecting proper laser power density and scanning speed; and performing laser phase change reinforcing treatment. Thus treated workpiece has high hardness, high load capacity and excellent wear resisting performance.

Description

Technical field: [0001] The invention relates to laser heat treatment, more specifically, relates to a laser phase transformation strengthening method for controlling the phase transformation strengthening gradient structure. Background technique: [0002] As a new technology of accurate local surface heat treatment, laser heat treatment has good strengthening effect and small deformation. However, so far, laser heat treatment is mostly based on the test of hardened layer depth and microhardness, whether the treated layer has defects and performance tests. When selecting process parameters, it is difficult to meet the heat treatment requirements under harsh service conditions under the premise that the base material cannot be selected arbitrarily. Invention content: [0003] The technical problem to be solved by the present invention is to control the relative amount of each layer of the gradient structure to determine the process parameters of the laser phase change stren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/09
Inventor 张光钧
Owner SHANGHAI UNIV OF ENG SCI
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