Method for improving wear resistance and rolling contact fatigue performance of steel rails

A technology of rolling contact fatigue and wear resistance, which is applied in the coating process and coating of metal materials, can solve the problems of rolling contact fatigue performance, wear resistance, crack porosity, and cladding layer unevenness, etc. Achieve the effects of strong grain dislocation, reduced stress, and uniform distribution of eutectic structure

Inactive Publication Date: 2017-08-29
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when pure Fe-based powder is used as cladding material, due to the rapid melting and solidification speed of pure Fe-based powder material during laser cladding, it will lead to uneven structure in the cladding layer, prone to cracks and large porosity
Lead to its rolling contact fatigue performance and wear resistance need to be improved

Method used

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  • Method for improving wear resistance and rolling contact fatigue performance of steel rails
  • Method for improving wear resistance and rolling contact fatigue performance of steel rails
  • Method for improving wear resistance and rolling contact fatigue performance of steel rails

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A method for improving the wear resistance and rolling contact fatigue performance of rails is to use a laser to clad Fe-based powders on the surface of the rails under argon protection, and it is characterized in that: the Fe-based alloy powders are Fe-based alloy powders. Fe-based alloy powder composed of lanthanum oxide powder with a mass content of 0.4% is added to the powder; the particle size of the Fe-based alloy powder is 50 mesh.

[0025] In this example, the laser is used to clad the Fe-based powder on the surface of the rail. The specific method is: the laser is a multi-mode cross-flow CO 2 Laser, the laser power is 2.8kw, the scanning speed is 200mm / min, the rectangular spot size of the laser beam is 1mm×7mm, the defocus is 31mm, and the powder feeding speed is 15g / min.

Embodiment 2

[0027] A method for improving the wear resistance and rolling contact fatigue performance of rails is to use a laser to clad Fe-based powders on the surface of the rails under argon protection, and it is characterized in that: the Fe-based alloy powders are Fe-based alloy powders. Fe-based alloy powder composed of lanthanum oxide powder with a mass content of 1.2% is added to the powder; its particle size is 100 mesh.

[0028] In this example, the laser is used to clad the Fe-based powder on the surface of the rail. The specific method is: the laser is a multi-mode cross-flow CO 2 For the laser, the laser power is 3.0kw, the scanning speed is 220mm / min, the rectangular spot size of the laser beam is 1mm×7mm, the defocus is 30mm, and the powder feeding speed is 10g / min.

Embodiment 3

[0030] A method for improving the wear resistance and rolling contact fatigue performance of rails is to use a laser to clad Fe-based powders on the surface of the rails under argon protection, and it is characterized in that: the Fe-based alloy powders are Fe-based alloy powders. Fe-based alloy powder composed of lanthanum oxide powder with a mass content of 2% is added to the powder; the particle size is 200 mesh.

[0031] In this example, the laser is used to clad the Fe-based powder on the surface of the rail. The specific method is: the laser is a multi-mode cross-flow CO 2 Laser, laser power 2.9kw, scanning speed 210mm / min, laser beam rectangular spot size 1mm×7mm, defocus amount 32mm, powder feeding speed 20g / min.

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Abstract

The invention discloses a method for improving wear resistance and rolling contact fatigue performance of steel rails. The method comprises the step of cladding surfaces of the steel rails with Fe-based powder by using a laser under argon shield and is characterized in that the Fe-based alloy powder is prepared through adding 0.4% to 2% by mass of lanthanum oxide powder into Fe-based powder. The steel rails obtained through treatment by the method are high in wear resistance and good in rolling contact fatigue performance.

Description

technical field [0001] The invention relates to a method for improving the wear resistance and rolling contact fatigue performance of steel rails. Background technique [0002] In order to ensure the safe operation of the railway system, the wear of the rails must be controlled within 13mm respectively, so increasing the wear resistance of the rails can effectively reduce the number of rail replacements and reduce operating costs. Laser cladding technology has broad application prospects in strengthening the surface of metal materials, improving wear resistance and fatigue resistance. Due to the low cost and good wear resistance of Fe-based powder materials, and similar composition to common carbon steel materials, cladding Fe-based powders on the surface of rails can effectively improve its wear resistance. However, when pure Fe-based powder is used as cladding material, due to the rapid melting and solidification of pure Fe-based powder material during laser cladding, it ...

Claims

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Application Information

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IPC IPC(8): C23C24/10
CPCC23C24/103
Inventor 王文健付志凯赵相吉张勇强刘启跃郭俊周仲荣
Owner SOUTHWEST JIAOTONG UNIV
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