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Off-line laser quenching process for surface strengthening treatment of steel rail

A laser quenching and surface treatment technology, used in heat treatment furnaces, heat treatment equipment, rails, etc., can solve the problems of reducing the toughness of the rails, prone to cracking, etc., and achieve the effects of small deformation of the workpiece, improved absorption efficiency, and improved wear resistance.

Inactive Publication Date: 2011-07-13
武汉武钢华工激光大型装备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the heavy rail laser quenching and hardening process proposed by the above-mentioned process has the following disadvantages: the whole surface of the rail is quenched by laser, which improves the hardness of the rail and reduces the toughness of the rail, so that the main parts of the turnout (such as the switch rail and the guard wheel) Rails, basic rails, forks) prone to cracking after quenching

Method used

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  • Off-line laser quenching process for surface strengthening treatment of steel rail
  • Off-line laser quenching process for surface strengthening treatment of steel rail
  • Off-line laser quenching process for surface strengthening treatment of steel rail

Examples

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Effect test

Embodiment 1

[0027] First, use sandpaper to polish the surface of the rail to remove oxides and dirt such as rust on the surface of the rail, and then use alcohol to further remove the oil on the surface of the rail to facilitate the absorption of the light-absorbing coating. Then the mass fraction is 60% Al 2 o 3 Particles, ZrO with a mass fraction of 20% 2 Particles and SiO with a mass fraction of 20% 2 The particles are mixed with water to obtain a light-absorbing paint. The Al 2 o 3 Particles, ZrO 2 Particles and SiO 2 Particles are submicron particles with a particle size of less than 1 micron. Then spray a layer of light-absorbing paint on the surface of the cleaned U71Mn rail with a spray gun to form a spray coating with a thickness of 0.01 mm. Finally, the rail is driven by the traction device to move at a speed of 10mm / s along the long axis on the cantilever laser processing machine tool. The machine tool is a five-coordinate four-linkage structure, and the laser is fixed ...

Embodiment 2

[0030] After polishing the surface of the rail with sandpaper to remove oxides and dirt such as rust on the surface of the rail, alcohol is used to further remove the oil on the surface of the rail to facilitate the absorption of the light-absorbing coating. Then the mass fraction is 70% Al 2 o 3 Particles, ZrO with a mass fraction of 18% 2 Particles and SiO with a mass fraction of 12% 2 The particles are mixed with water to obtain a light-absorbing paint. The Al 2 o 3 Particles, ZrO 2 Particles and SiO 2Particles are submicron particles with a particle size of less than 1 micron. Then apply a layer of light-absorbing paint on the surface of the cleaned U75V rail with a brush to form a spray coating with a thickness of 0.01mm. Finally, the rail is driven by the traction device to move at a speed of 8 mm / s along the long axis on the cantilever laser processing machine tool. The machine tool is a five-coordinate four-linkage structure, and the laser is fixed and incident...

Embodiment 3

[0033] After polishing the surface of the rail with sandpaper to remove rust and other oxides and dirt on the surface of the rail, use alcohol to further remove the oil on the surface of the rail to facilitate the absorption of the light-absorbing coating. Then the mass fraction is 70% Al 2 o 3 Particles, ZrO with a mass fraction of 18% 2 Particles and SiO with a mass fraction of 12% 2 The particles are mixed with water to obtain a light-absorbing paint. The Al 2 o 3 Particles, ZrO 2 Particles and SiO 2 Particles are submicron particles with a particle size of less than 1 micron. Then spray a layer of light-absorbing paint on the surface of the cleaned U71Mn rail with a spray gun to form a spray coating with a thickness of 0.1mm. Finally, the rail is driven by the traction device to move at a speed of 14mm / s along the long axis on the cantilever laser processing machine tool. The machine tool is a five-coordinate four-linkage structure, and the laser is fixed and incid...

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Abstract

The invention discloses an off-line laser quenching process for surface strengthening treatment of a steel rail. The process comprises the following steps of: coating a layer of light absorption coating on the surface of the steel rail, then moving the steel rail, and scanning the surface of the steel rail by using pulse laser along the length direction at a certain speed to obtain latticed tissues, namely fine martensitic laser quenching points on the surface of the steel rail, wherein the area of the laser quenching points is 50 to 80 percent of the area of the surface of the steel rail, and the highest depth of the quenching points is 0.4 to 1.0 millimeter. In the off-line laser quenching process, the latticed quenching points can be formed on the surface of the steel rail, the quenching point tissues are martensitic tissues, the depth of the quenching layer is 0.4 to 1.0 millimeter, the hardness is more than HV700, and the fine martensite of the laser quenching points has high hardness and abrasion resistance. The toughness of the steel rail is reserved for pearlite in an untreated area, and the complex phase tissues of the martensite and the pearlite have good toughness and can remarkably prolong the service life of the steel rail.

Description

technical field [0001] The invention relates to the field of laser surface strengthening, in particular to an off-line laser quenching process for steel rail surface strengthening treatment. technical background [0002] Steel rail is the main component of rail transportation. The steel rail is in direct contact with the wheels of the train. The quality of the rail directly affects the safety and stability of the train. The main rail steel types of my country's railways are mainly U71Mn and U75V, both of which are ordinary carbon steel rails. With the increase of train speed, traffic volume and axle load, the damage rate of these two rails is getting faster and faster, which has exposed the problems of insufficient bearing capacity, insufficient wear resistance, and short service life, making the safety caused by rail damage Accidents occur from time to time, and the direct cost of replacing and repairing damaged rails in my country is as high as billions of yuan each year. ...

Claims

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Application Information

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IPC IPC(8): C21D9/04C21D1/09E01B31/18
Inventor 莫衡阳万涛叶兵熊志红
Owner 武汉武钢华工激光大型装备有限公司
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