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Gradient material steel rail frog prepared by laser cladding

A laser cladding, gradient material technology, applied in the field of high load-carrying performance rail frog, high wear resistance, gradient material rail frog field, can solve the problems of high martensite hardness, low toughness, etc., to achieve excellent mechanical properties, hardness The effect of smooth curve and wear resistance of mechanical properties

Active Publication Date: 2019-08-16
BEIJING UNIV OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The melting and solidification speed of laser cladding Fe-based materials is very fast, and it is relatively easy to produce martensite structure. However, due to the high hardness of martensite but low toughness, the appearance of martensite in rails is prohibited in the railway industry standard TB / T2344-2003. Tensile structure

Method used

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  • Gradient material steel rail frog prepared by laser cladding
  • Gradient material steel rail frog prepared by laser cladding
  • Gradient material steel rail frog prepared by laser cladding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment one comprises the following steps:

[0024] U75V rail frog is selected as the substrate, and the components of the transition layer ferroalloy powder in the laser cladding layer are respectively Fe: 71wt%, Cr: 17wt%, Ni: 6wt%, Si: 1.5wt%, Mn: 1wt%, B: 1wt%, Nb: 1.2wt%, V: 1.2wt%, C: 0.1wt%; the reinforcement layer Fe-based composite coating is Cr: 15wt%, Ni: 5wt%, Mo: 2wt% in mass percentage , Mn: 1wt%, C: 0.05wt%, V: 1wt%, WC: 0.5wt%, TiC: 0.5wt%, NbC: : 0.3wt%, La 2 O3:0.5wt%, Al 2 o 3: 0.5wt%, Fe73.65wt%. Weigh and configure the raw materials according to the mass percentage of the above components, melt the transition layer alloy powder and use gas atomization to obtain Fe-based alloy powder respectively, so as to realize the homogenization of the powder; then compound the Fe-based metal nanophase of the strengthening layer The non-nano-phase powder of the material is smelted and powdered by gas atomization, and then the prepared powder is mechanical...

Embodiment 2

[0033] The same part as in Example 1 will not be described again, and the U75V rail frog is selected as the substrate. The difference in the coating is that the components of the layer are proportioned by mass percentage, and the components of the transition layer ferroalloy powder are respectively Fe: 74.4wt by mass percentage. %, Cr: 15wt%, Ni: 5wt%, Si: 1wt%, Mn: 1wt%, B: 1.5wt%, C: 0.5wt%, Nb: 0.8wt%, V: 0.8wt%; function strengthening layer Fe According to the mass percentage of the matrix composite coating, Cr: 18wt%, Ni: 6wt%, Mo: 3wt%, Mn: 2wt%, C: 0.3wt%, V: 1wt%, WC: 1wt%, TiC: 0.7wt% %, NbC: ： 0.6wt%, La 2 o 3： 0.8wt%, Al 2 o 3： 0.6wt%, Fe: 66wt%.

[0034] Using Trumpf 4000 watt fiber output semiconductor laser (wavelength 1070nm), adjust the distance between the laser processing head and the workpiece, and preheat the rail parts under laser scanning (power 3KW, scanning speed 20mm / min), the preheating temperature is 400 ℃ , circular spot size 5mm. The transit...

Embodiment 3

[0038] Embodiment 1 The same part will not be described again, the difference is that the U71Mn rail frog is selected as the substrate, the components of the coating are proportioned by mass percentage, and the components of the transition layer ferroalloy powder are respectively Fe: 79.5wt% by mass percentage , Cr: 13wt%, Ni: 3wt%, Si: 1.5wt%, Mn: 0.5wt%, B: 1wt%, C: 0.7wt%, Nb: 0.3wt%, V: 0.5wt%; strengthening layer Fe-based The composite material coatings are respectively Cr: 20wt%, Ni: 7wt%, Mo: 4wt%, Mn: 3wt%, C: 1wt%, V: 1.5wt%, WC: 2wt%, TiC: 0.8wt% in mass percentage , NbC: ： 0.9wt%, La 2 o 3： 1wt%, Al 2 o 3： 0.8wt%, Fe: 58wt%.

[0039] Using a semiconductor laser with 8000 watts of optical fiber output (wavelength 920-1040nm), adjust the distance between the laser processing head and the workpiece, and preheat the rail parts under laser scanning (power 5KW, scanning speed 50mm / min), and the preheating temperature is 500 ℃, circular spot size 8mm. The circular s...

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Abstract

The invention provides a gradient composite material steel rail turnout coating prepared by laser cladding. The composite material is characterized in that a transition layer adopts a Fe-based alloy material, wherein the Fe-based alloy material comprises the following components of, in percentage by weight, 13wt%-17wt% of Cr, 3wt%-6wt% of Ni, 1wt%-1.5wt% of Si, 0.5wt%-1wt% of Mn, 0.3wt%-1.2wt% ofNb, 1wt%-1.5wt% of B, 0.05wt%-0.7wt% of C, 0.5wt%-1.2wt% of V, and the balance Fe; a strengthening layer is arranged above the transition layer, and the strengthening layer adopts a Fe-based metal nano-phase composite material. The preparation method comprises the following steps of preparing the Fe-based metal powder and the Fe-based metal nano-phase composite material coating; preheating a steelrail by using laser scanning heating so as to reduce the temperature gradient; preparing the gradient composite material coating on the surface of the steel rail by utilizing a laser cladding technology, and performing laser scanning heat treatment; and reducing the cooling rate after laser cladding, so that the martensite of the heat affected zone is prevented from being generated, and the cracking property of the coating is reduced. The prepared steel rail frog has the advantages that the hardness curve is smooth, the overall toughness and bearing performance are good, the strength and hardness is higher than a common heavy-load railway frog, the service life is longer, and manufacturing integration is relatively strong.

Description

technical field [0001] The invention relates to a gradient material rail frog prepared by laser cladding, in particular to a highly wear-resistant and high-load-bearing rail frog prepared by a novel gradient material, which belongs to the field of laser material processing and manufacturing. Background technique [0002] Railway transportation is an important mode of transportation in my country. With the continuous increase of railway transportation volume, the service life of rail frogs is significantly reduced. The construction cost of railways mainly composed of U75V and U71Mn is high, and the requirements for track and offline parts are high. The frog is the line device when the train is running from one track to another. Its complex structure, many parts, and large impact force are the most vulnerable links in the heavy-duty railway system. Part of the entire rail needs to be replaced. Frequent replacement of frogs not only wastes a lot of cost, but also affects the sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58C23C24/10
CPCC22C38/005C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58C23C24/103
Inventor 杨胶溪张文韬周正武飞宇白兵王高生杨磊崔哲柯华吴文亮肖俊恒
Owner BEIJING UNIV OF TECH
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