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
5 Cites 7 Cited by

AI-Extracted 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...
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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.

Application Domain

Metallic material coating processes

Technology Topic

RemanufacturingIron based alloy +6

Image

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

Examples

  • Experimental program(3)

Example Embodiment

[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 for laser remanufacturing of 28CrMoNiV rotor shaft journal is used as follows:
[0048] (1) First, turn the failed part of the rotor journal to make the surface clean and smooth, and remove oil;
[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: the laser power is 3.0KW, the scanning speed is 4mm/s, the powder feeding amount is 10g/min, the diameter of the laser spot is 6mm and the overlap ratio is 50%, and the laser cladding remanufacture is carried out. ;
[0052] (5) Repeat the cladding of multiple layers according to actual needs to exceed the target size and leave a machining allowance;
[0053] (6) The failure part of the rotor journal can be repaired by turning the lathe to the target size;
[0054] (7) After machining, a portable hardness tester was used to test. The average Vickers hardness of the repaired area was 353Hv. As the number of layers increased, the hardness would have a downward trend. After 4 layers, the hardness had almost no change, and the lowest hardness dropped to 321Hv. No cracks were found by coloring inspection.

Example Embodiment

[0055] Example 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 powder after sieving is 40-140um.
[0057] The specific steps of the laser combination manufacturing process are as follows:
[0058] (1) to (5) are the same as the laser combination manufacturing process steps of Embodiment 1.
[0059] After machining, it was tested with a portable hardness tester. The average Vickers hardness of the repaired area was 307Hv. As the number of layers increased, the hardness would have a downward trend. After 4 layers, there was almost no change in the hardness, and the lowest hardness dropped to 286Hv. , No cracks were found after coloring inspection.

Example Embodiment

[0060] Examples 3-7:
[0061] The implementation steps are the same as those in the embodiments (1) and (2). The total amount of alloy powder, chemical composition, powder particle size and coating hardness of the batches are shown in Table 1.
[0062] Table 1 Examples 3-7
[0063]

PUM

PropertyMeasurementUnit
Vickers hardness321.0 ~ 353.0
Vickers hardness307.0
Hardness286.0

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