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Laser cladding alloy powder, steel rail and preparation method

A laser cladding and alloy powder technology, applied in metal material coating process, coating and other directions, can solve problems such as difficulty in meeting, and achieve the effects of good compatibility, wide application and good toughness

Active Publication Date: 2021-10-26
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The strengthening mechanism of Fe-Ni type ultra-high strength steel is Ni 3 The precipitation strengthening of the M (M=V, Mo, Nb, W) phase requires several hours of aging strengthening treatment to achieve a higher strength. This material is difficult to meet the requirements of the on-site laser cladding process.

Method used

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  • Laser cladding alloy powder, steel rail and preparation method
  • Laser cladding alloy powder, steel rail and preparation method
  • Laser cladding alloy powder, steel rail and preparation method

Examples

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preparation example Construction

[0041] The invention provides a method for preparing laser cladding rails, which includes the following stages: primary cladding, aging cladding, and subsequent aging treatment, wherein the primary cladding refers to the high heating temperature of the cladding layer. At the austenitizing phase transition temperature, after rapid cooling, the cladding layer undergoes a solid solution strengthening process. The aging cladding refers to the process in which the bottom cladding layer is age-strengthened when the laser cladding layer is accumulated. During aging cladding, the reheating temperature of the bottom cladding layer is lower than the austenitizing phase transition temperature, and the cladding layer will undergo aging strengthening after cooling. The subsequent aging treatment refers to that after the laser cladding is completed, the laser The process of making the cladding layer undergo a transitional change from high temperature to low temperature, and then make the sur...

Embodiment 1

[0062] The IPG fiber laser is used to realize automatic powder feeding through the powder feeder. The temperature cycle curve is recorded by the thermocouple external acquisition card. The laser cladding process parameters are: laser power 6kW, scanning speed 800mm / min, spot size 2×12mm; laser The composition ratio of cladding powder is (wt.%): 20% Ni, 10% Co, 5% Mo, 3.5% Al, 2.5% Ti, 0.25% Cr, 0.25% Cu, 0.015% C, Fe is the balance . The base material is bainitic steel rail. Using thermocouple measurement and fitting calculation to obtain the temperature change curve of the workpiece surface during laser cladding with different thicknesses, the curve is T=884.79*exp(-x / 1.08)+388.15, such as figure 2 as shown, figure 2 For the temperature change curve of the workpiece surface when the laser cladding of the present invention has different thicknesses, the total thickness of the new Fe-Ni aging steel laser cladding layer on the rail is 5mm, and this curve can assist in formul...

Embodiment 2

[0065] In this embodiment, an IPG fiber laser is used to realize automatic powder feeding through a powder feeder, and the temperature cycle curve is recorded by an external acquisition card connected to a thermocouple. The composition of the laser cladding powder and the mass percentage of each composition are: 16wt.%Ni, 12%wt.Co, 3%wt.Mo, 0.1%wt.Al, 0.5%wt.Ti, 0.5%wt.Cr, 0.5% wt.Cu, 0.03% wt.C, the balance is Fe. The base material is bainitic steel rail. Using thermocouple measurement and fitting calculation to obtain the temperature change curve of the workpiece surface at different thicknesses of laser cladding, the total thickness of the new Fe-Ni aging steel laser cladding layer on the rail is 10mm, including primary cladding, aging cladding, There are three stages of subsequent aging treatment. When the single-layer cladding layer thickness is 0.6mm, the aging heating temperature range can be guaranteed to be 630°C.

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Abstract

The invention discloses laser cladding alloy powder, a steel rail and a preparation method, and belongs to the field of laser surface treatment. The laser cladding alloy powder comprises, by weight percent, 16-22% of Ni, 6-12% of Co, 3-7% of Mo, 0.1-7% of Al, 0.5-5% of Ti, 0-0.5% of Cr, 0-0.5% of Cu, 0-0.03% of C, and the balance Fe. The alloy powder can be used for preparing the steel rail with a laser cladding layer. The preparation method of the laser cladding steel rail comprises three stages of primary cladding, aging cladding and subsequent aging treatment. According to the laser cladding alloy powder, the steel rail and the preparation method, by virtue of the laser cladding alloy powder, a coherent strengthening NiAl phase can be used for greatly improving the strength of the cladding layer; the aging strengthening treatment time is short; the efficiency is high; the process is simple and quick; and the practical engineering application value is great.

Description

technical field [0001] The invention belongs to the field of laser surface treatment, and more specifically relates to a laser cladding alloy powder, a steel rail and a preparation method. Background technique [0002] Laser cladding has the characteristics of high energy density and small workpiece deformation. Using laser cladding to repair worn frog rails and switch rails can significantly improve the service life of rails. [0003] Laser cladding, also known as laser cladding or laser cladding, is a new surface modification technology. It forms a metallurgically bonded cladding layer on the surface of the base by adding cladding materials on the surface of the substrate and using a high-energy-density laser beam to fuse it together with the thin layer on the surface of the substrate. Common cladding materials are alloy powders. Alloy powders with different compositions have different bonding capabilities with the substrate, and the obtained cladding layers have differen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C23C24/10C22C38/52C22C38/44C22C38/06C22C38/50C22C38/42C22C38/10C22C38/08C22C38/12C22C38/14C22C38/16C22C30/00C22C30/02
CPCC23C24/106C22C38/52C22C38/44C22C38/06C22C38/50C22C38/42C22C38/105C22C38/12C22C38/14C22C38/16C22C30/00C22C30/02Y02P10/25
Inventor 胡乾午吴细水曾晓雁徐其瑞朱贝贝王邓志
Owner HUAZHONG UNIV OF SCI & TECH