Method for efficiently compounding fusion-covering reinforced steel rail through laser and auxiliary heat source

An auxiliary heat source and rail technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve problems such as poor railway branching and repair of damaged rails, and achieve good overall fatigue performance, high processing accuracy, and small residual stress and deformation. Effect

Active Publication Date: 2018-08-28
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can be used for the preparation of high-performance cladding layer on the surface of the rail to improve the wear resistance and contact fatigue performance of the rail, and can also be used to solve the problems of poor railway branching and repair of damaged rails, etc.

Method used

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  • Method for efficiently compounding fusion-covering reinforced steel rail through laser and auxiliary heat source
  • Method for efficiently compounding fusion-covering reinforced steel rail through laser and auxiliary heat source
  • Method for efficiently compounding fusion-covering reinforced steel rail through laser and auxiliary heat source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1: High-efficiency thermal composite cladding after on-line laser-induction of railways

[0049] In this example, the service rails are efficiently strengthened and repaired at the railway site, induction heating is used as an auxiliary heat source, and the processing motion and position control unit adopts industrial manipulators or three-dimensional motion axes. The area to be clad on the surface of the rail is heated by an induction heating component and a temperature control mechanism, and the heating temperature and time are controlled. The induction heating component includes an induction power supply and an induction coil. The temperature control mechanism includes an infrared thermometer and a temperature controller. The induction coil is connected to the induction power supply. The infrared thermometer is connected to the temperature controller. The temperature controller is connected to the induction power supply through a data line. . The detection s...

Embodiment 2

[0059] Example 2: Railway online laser-induction preheating + post-induction heat efficient composite cladding

[0060] In this example, the service rails are efficiently strengthened and repaired at the railway site. Induction heating is used as an auxiliary heat source. The induction heating control mechanism is the same as that of Example 1. The processing motion and position control unit adopts industrial manipulators or three-dimensional motion axes. The laser spot is focused in the middle of the induction coil, such as figure 2 As shown, the metal cladding layer is prepared on the surface of the rail by laser-induction preheating + post-induction thermal composite cladding. The basic implementation steps are as follows:

[0061] (1) Nickel-based alloy powder is selected as the cladding material, the main chemical composition is (Wt.%): (0.01-0.50) C, (20-30) Cr, (5-10) W, (3-5) Si ,(0-3)B,(5-10)Fe,Ni balance;

[0062] (2) Grinding the cladding area on the surface of t...

Embodiment 3

[0070] Example 3: Off-line rail surface laser-induction heating + oxyacetylene flame (propane blowtorch) heating and high-efficiency composite cladding

[0071] In this example, off-line strengthening and repairing of steel rails is carried out, and induction heating and oxyacetylene flame (or propane torch) are used as auxiliary heat sources. The laser spot is focused in front of the induction coil, and the oxyacetylene flame (or propane torch) preheats the surface of the rail to be clad, such as image 3 As shown, the laser and the induction coil move in the same direction and at the same speed, and the induction heating performs synchronous heating on the laser molten pool and the heat-affected zone of the rail. The basic implementation steps are as follows:

[0072] (1) Cobalt-based alloy powder is selected as the cladding material, the main chemical composition is (Wt.%): (0.01-0.5) C, (20-35) Cr, (1-10) Ni, (1-3) Si , (5-15) W, (0-3) B, (0.5-2) Mn, Co balance;

[0073] (...

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Abstract

The invention discloses a method for efficiently compounding a fusion-covering reinforced steel rail through laser and an auxiliary heat source. The laser and the auxiliary heat source act on a to-be-fusion-covered area on the surface of the steel rail simultaneously, as a main heat source, the laser makes the material of a fusion-covering layer and the material on part of the base of the surfaceof the steel rail quickly fused simultaneously to form a fusion pool, the auxiliary heat source and the laser heat source move in the same direction at the same speed and preheat and / or postheat the laser fusion pool, a heat influence area and the surface layer of the base of the steel rail, the temperature gradient of the steel rail is lowered, thus the cooling speed of the steel rail is lowered,and the phenomena of transforming of a martensite in a heat influence area and cracking are avoided. Through the compounding effect, the critical cooling time for transforming an austenite to a pearlite is shortened in the heat influence area wherein the cooling time is larger than a CCT curve or a TTT curve, so that the mechanical performance among the fusion-covering layer, the heat influence area and the base is reasonably matched, the rigidity curve is smooth in distribution, and the overall fatigue performance is good. The method can fuse-cover a metal layer on the surface of a field ofa railway steel rail on line and can also achieve fuse-covering machining on the surface of the steel rail in a production workshop.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to a method for efficiently preparing a metal cladding layer on the surface of a rail by using laser-assisted heat source composite cladding. The method can be used to improve the wear resistance and contact fatigue performance of the rail, and can also be used to solve bad railway branching and repair damaged rails. Background technique [0002] my country's rail transit has developed rapidly. By the end of 2016, the national railway operating mileage had reached 124,000 kilometers. With the increase of railway transportation volume, train speed and axle load, the damage problems of rails are becoming more and more prominent, such as rail wear, rolling contact fatigue and rail corrosion. The damage of the rail mainly occurs on the surface, so it is of great significance to prepare the coating on the surface of the rail to prolong its service life. [0003] Thermal s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C21D9/04C21D1/09
CPCC21D1/09C21D9/04C21D2211/00C23C24/10C21D2211/009C23C24/106
Inventor 曾晓雁孟丽王邓志胡乾午郭平华许晓明牛莅
Owner HUAZHONG UNIV OF SCI & TECH
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