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Iron-based alloy powder for laser refabrication of rotor journal, and refabrication method thereof

A laser remanufacturing, iron-based alloy technology, applied in metal material coating process, coating and other directions, can solve the problems of increasing the cost of replacing the rotor, difficult to install and use again, not meeting energy saving and consumption reduction, etc. Good oxidation performance, excellent quality, and the effect of prolonging the service life

Inactive Publication Date: 2017-02-22
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional repair method generally loses a lot of performance
The cost of directly replacing a large rotor is high and the production cycle is long
In particular, many rotors are equipped with steam turbine blades, and it is difficult to install and use them again after disassembly, which directly increases the cost of replacing the rotors
Therefore, directly replacing the new rotor is not the best equipment maintenance solution, nor does it meet the requirements of energy saving and consumption reduction

Method used

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  • Iron-based alloy powder for laser refabrication of rotor journal, and refabrication method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The total mass of this batch of powder alloy is 5.7Kg, and its chemical composition (weight percentage) is C: 0.1%, Cr: 16.0%, Si: 1.5%, B: 1.0%, Fe: balance. The particle size of the powder after sieving is 40-140um.

[0047] An iron-based alloy powder used for laser remanufacturing of 28CrMoNiV rotor shaft journal is used as follows:

[0048] (1) Turn the failure part of the rotor journal first to make the surface clean, smooth and degrease;

[0049] (2) Put the dry powder into the powder feeder;

[0050] (3) Adjust the laser position to the area to be repaired, and edit the program.

[0051] (4) Set the laser process parameters as follows: laser power to 3.0KW, scanning speed to 4mm / s, powder feeding rate to 10g / min, laser spot diameter to 6mm, overlap rate to 50%, and laser cladding remanufacturing ;

[0052] (5) Repeat cladding multiple layers according to actual needs to exceed the target size and leave a machining allowance;

[0053] (6) Turning to the targe...

Embodiment 2

[0056] The total mass of this batch of powder alloy is 2.8Kg, and its chemical composition (weight percentage) is C: 0.03%, Cr: 13.0%, Si: 0.9%, B: 0.5%, Fe: balance. The particle size of the sieved powder is 40-140um.

[0057] The specific steps of the laser combined manufacturing process are as follows:

[0058] (1) to (5) are the same as the laser combination manufacturing process steps in Embodiment 1.

[0059] After machining, the portable hardness tester is used to test the average Vickers hardness of the repaired area is 307Hv. As the number of layers increases, the hardness will decrease. After 4 layers, the hardness will hardly change, and the hardness will drop to 286Hv at the lowest. , No cracks were found by coloring flaw detection.

Embodiment 3-7

[0061] Implementation steps are with embodiment (1) and (2). The total amount, chemical composition, powder particle size and coating hardness of the batch of alloy powder are shown in Table 1.

[0062] Table 1 Examples 3-7

[0063]

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Abstract

The invention discloses an iron-based alloy powder for the laser refabrication of a rotor journal, and a refabrication method thereof. The iron-based alloy powder comprises the following components in weight percentage: 0.03-0.1% of C, 13.0-16.0% of Cr, 0.9-1.5% of Si, 0.5-1.0% of B and iron as the balance. The laser refabrication method comprises the steps of (1) subjecting the failure part of a rotor journal to the lathe machining treatment to enable the surface thereof to be clean and flat, and removing oil; (2) adding the dried iron-based alloy powder into a powder feeder; (3) adjusting the laser position to be within a to-be-repaired region, and editing a program; (4) setting laser process parameters; (5) according to actual needs, repeating the laser cladding process to form multiple cladding layers till the cladding layers exceed a target size and a machining allowance is reserved; (6) turning to reach the target size by a lathe; (7) conducting the hardness and crack detection. According to the invention, the performance of a coating is approximate to the performance of an original new product. Meanwhile, the advantages of wide process adaptability, consistent repeatability and strong operability are realized.

Description

technical field [0001] The invention relates to an iron-based alloy powder used for laser remanufacturing of a rotor journal and a laser remanufacturing method thereof, especially an iron-based alloy powder used for laser remanufacturing of a 28CrMoNiV rotor journal, which belongs to a new surface coating technology with material. Background technique [0002] A steam turbine is a rotary power machine that can convert the energy of steam into mechanical work. It is mainly used as a prime mover for power generation, and can also directly drive other mechanical devices. It is widely used in petrochemical, steel production, power facilities and other fields. The rotor of 28CrMoNiV material is a common core working part of industrial steam turbines, and it needs to serve for a long time under the condition of high temperature water vapor. Generally speaking, the journal part of the rotor is prone to failure such as wear and holding tiles. The failed rotors are usually repaired...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C38/32C22C38/02
CPCC22C38/02C22C38/32C23C24/103
Inventor 董刚陈智君李允东姚建华孔建强
Owner ZHEJIANG UNIV OF TECH
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