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Laser cladding iron-based alloy powder for repairing steam turbine rotor journal and preparation and application thereof

An iron-based alloy, laser cladding technology, applied in the direction of metal material coating process, coating, etc., to achieve the effect of low dilution rate, excellent bonding strength, and improved toughness

Inactive Publication Date: 2020-12-11
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at problems such as wear and roughening that occur during the operation of the 30Cr2Ni4MoV steam turbine rotor shaft, the present invention provides a laser cladding iron-based alloy powder and a repair method for repairing the 30Cr2Ni4MoV steam turbine rotor journal, which can effectively repair the 30Cr2Ni4MoV steam turbine rotor journal surface defects

Method used

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  • Laser cladding iron-based alloy powder for repairing steam turbine rotor journal and preparation and application thereof
  • Laser cladding iron-based alloy powder for repairing steam turbine rotor journal and preparation and application thereof
  • Laser cladding iron-based alloy powder for repairing steam turbine rotor journal and preparation and application thereof

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Effect test

Embodiment 1

[0059] An iron-based alloy powder for repairing the rotor journal of a 30Cr2Ni4MoV steam turbine, the chemical composition of the iron-based alloy powder is: carbon C: 0.04%, chromium Cr: 1.0%, molybdenum Mo: 0.5%, silicon Si: 0.5% , manganese Mn: 0.6%, boron B: 0.4%, and the balance is Fe.

Embodiment 2

[0061] An iron-based alloy powder for repairing the rotor journal of a 30Cr2Ni4MoV steam turbine, the chemical composition of the iron-based alloy powder is: carbon C: 0.05%, chromium Cr: 1.1%, molybdenum Mo: 0.6%, silicon Si: 0.6% , manganese Mn: 0.7%, boron B: 0%, and the balance is Fe.

Embodiment 3

[0063] figure 1 It is a schematic diagram of the principle of gas atomization pulverization, and the above-mentioned preparation method of the iron-based alloy powder for repairing the rotor journal of a 30Cr2Ni4MoV steam turbine, the specific steps are as follows:

[0064] Step 1: Ingredients: Prepare raw materials according to the weight percentage of each component in the laser cladding powder described in Embodiment 1 or 2;

[0065] Step 2: Melting: put the raw materials prepared in Step 1 into an intermediate frequency induction melting furnace for melting to obtain an alloy solution, and keep it in a vacuum holding furnace for 3 hours;

[0066] Step 3: Atomization: further atomize the alloy solution obtained in step 2, the atomization medium is an inert gas at -15°C ~ 5°C, and the atomization pressure is 3-6MPa; after the atomization, in an inert atmosphere at room temperature Down to room temperature, it can be obtained after drying, and the powder is collected and sie...

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Abstract

The invention provides iron-based alloy powder. The iron-based alloy powder is prepared from the following components in percentage by mass: 0.04%-0.07% of C, 0.90%-1.20% of Cr, 0.4%-0.9% of Mo, 0.4%-0.7% of Si, 0.5%-0.8% of Mn, 0-0.6% of B and the balance of Fe. A laser cladding layer obtained through the alloy powder has excellent bonding strength, low metallurgical defects and a low dilution rate, the toughness and hardness of the cladding layer are improved, the use requirements are met, and the defects on the surface of a 30Cr2Ni4MoV steam turbine rotor journal can be effectively repaired.

Description

technical field [0001] The invention belongs to the technical field of laser cladding remanufacturing repair, and in particular relates to a laser cladding iron-based alloy powder used for repairing a 30Cr2Ni4MoV steam turbine rotor journal, as well as its preparation and application. Background technique [0002] The key part of steam turbine power generation is the "rotor", which faces many failure forms, such as: wear, corrosion and contact fatigue. Among them, the wear failure at the journal is related to the reliable and continuous operation of the steam turbine and directly affects the safety of the unit. Once the steam turbine rotor journal is worn, a uniform and dense oil film cannot be formed inside the bearing pad, which will lead to further aggravation of the bearing pad wear, and eventually the bearing pad will burn due to the increased wear. In addition, the wear of the steam turbine rotor journal caused the lack of journal material, resulting in a loose fit be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C22C38/32C22C38/02C22C38/04B22F1/00B22F9/08C23C24/10
CPCB22F1/0003B22F9/082B22F2009/0824B22F2009/0836C22C38/02C22C38/04C22C38/22C22C38/32C23C24/103
Inventor 董刚姚建华张群莉陈智君卞顺
Owner ZHEJIANG UNIV OF TECH
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