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Laser cladding material and train rail laser cladding repair process

A laser cladding and process technology, which is applied in the coating process and coating of metal materials, can solve the problems of poor toughness and corrosion resistance, achieve the effect of satisfying toughness and improving repair efficiency

Inactive Publication Date: 2021-01-29
山东镭研激光科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the technical problems of high residual thermal stress and poor toughness and corrosion resistance of the train rail cladding layer, the present invention provides a laser cladding material and a laser cladding repair process for train rails. Partial repair of the rail can achieve the technical effect of restoring the size of the rail and improving the surface performance. While ensuring the performance of the rail, it can improve the repair efficiency and reduce the repair cost

Method used

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  • Laser cladding material and train rail laser cladding repair process
  • Laser cladding material and train rail laser cladding repair process

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A laser cladding material, the laser cladding material is an iron-based alloy powder with a particle size of 75 μm, including the following components:

[0041]C: 0.08wt%, Cr: 16.0wt%, Ni: 2.5wt%, Mo: 1.0wt%, Mn: 0.2wt%, Si: 0.5wt%, B: 0.05wt%, the balance is Fe and unavoidable Impurities.

Embodiment 2

[0043] A laser cladding material, the laser cladding material is an iron-based alloy powder with a particle size of 150 μm, comprising the following components:

[0044] C: 0.10wt%, Cr: 18.0wt%, Ni: 5.0wt%, Mo: 2.0wt%, Mn: 0.50wt%, Si: 1.0wt%, B: 0.50wt%, the balance is Fe and unavoidable Impurities.

[0045] The rail sample and the coating prepared by the laser cladding material in Example 2 were respectively made into pin-shaped samples, and rubbed against the same friction pair under the same friction and wear conditions, and the weight loss of the sample before and after friction was measured to characterize the wear resistance of the sample , each sample was measured three times, and the average value was taken. After measurement, the weight loss of the rail sample is 0.0042g, while the weight loss of the laser cladding material coating is 0.003g. It can be seen that under the same friction conditions, the laser cladding material coating is more wear-resistant. Correspon...

Embodiment 3

[0048] A laser cladding repair process for train rails using the laser cladding material of Example 2. The test rail is selected as the base material, the pneumatic coaxial powder feeding method is adopted, and the laser is controlled by a manipulator. The alloy powder is clad onto the surface of the damaged rail to obtain a laser cladding layer with good surface shape, no cracks and blisters, and a metallurgical combination with the base material, so as to realize the surface repair of the rail. The process specifically includes the following steps:

[0049] (1) Pretreatment: conduct ultrasonic flaw detection on the rail to be repaired to ensure that there is no damage to the core of the rail;

[0050] Grinding the damaged surface with the grinding wheel, making a smooth transition on the edge, and performing color penetrant inspection on the grinding area to ensure that there are no cracks, then clean the rail surface flaw detection agent to ensure that the area to be repaire...

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Abstract

The invention relates to the technical field of laser cladding, in particular to a laser cladding material and a train rail laser cladding repair process. The laser cladding material is iron-based alloy powder and comprises less than or equal to 0.13wt% of C, 16.0wt%-18.0wt% of Cr, less than or equal to 5.0wt% of Ni, 1.0wt%-2.0wt% of Mo, less than or equal to 0.5wt% of Mn, less than or equal to 1.2wt% of Si, less than or equal to 0.85wt% of B and the balance Fe and inevitable impurities. According to the process, a rail is selected as a base material, a pneumatic coaxial powder feeding mode isadopted, a manipulator is used for controlling the running route of a laser device, the iron-based alloy powder is cladded to the surface of the rail through laser, and the surface of the rail is repaired. The laser cladding material and the train rail laser cladding repair process can achieve the technical effects of restoring the size of the rail and improving the surface performance, the repair efficiency is improved while the performance of the rail is guaranteed, and the repair cost is reduced.

Description

technical field [0001] The invention relates to the technical field of laser cladding, in particular to a laser cladding material and a laser cladding repair process for train rails. Background technique [0002] With the increase of the load capacity and speed of the train, the problem of rail damage is becoming more and more serious. At present, manual welding is usually used to repair the surface damage of the rail. It is mainly divided into cold welding repair of manganese steel surfacing electrodes and on-site pearlitic electrodes. Preheat weld repair. There are still many deficiencies in welding repair: the input of preheating welding heat is large, it is easy to affect the strength of the rail core, and the welding stress is easy to cause the decline of the performance of the entire rail; the flatness of the welding repair surface is poor, and a large amount of manual grinding is required; Welding repairs require high personnel skills and high operating thresholds; w...

Claims

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Application Information

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IPC IPC(8): C22C38/54C22C38/44C22C38/32C22C38/22C23C24/10
CPCC22C38/54C22C38/44C22C38/32C22C38/22C22C38/02C22C38/04C23C24/106
Inventor 李峰西何建群王文涛王立果黄腾
Owner 山东镭研激光科技有限公司