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Method for preparing defect-free high-hardness laser cladding layer through coaxial powder feeding

A technology of coaxial powder feeding and laser cladding, which is applied in the direction of coating and metal material coating process to achieve the effect of uniform distribution of alloy structure, uniform structure distribution and increased fluidity.

Active Publication Date: 2022-01-21
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a method for coaxial powder feeding to prepare a defect-free high-hardness laser cladding layer, which can increase the kinetic energy of alloy powder particles, thereby increasing the fluidity of liquid metal in the molten pool, so that the structure of the cladding layer is distributed More uniform, avoiding defects such as cracks that are prone to occur when preparing high-hardness cladding layers

Method used

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  • Method for preparing defect-free high-hardness laser cladding layer through coaxial powder feeding
  • Method for preparing defect-free high-hardness laser cladding layer through coaxial powder feeding

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Experimental program
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Embodiment 1

[0037] In this implementation, the components of the cladding alloy material and the weight percentages of each component are: C powder: 0.95%, Si powder: 0.2%, Mn powder: 0.3%, Mo powder: 4.75%, and the balance is Fe Powder, the components are all powders with a purity greater than 99%, and the particle size is: 135-325 mesh. Also includes the following steps:

[0038] (1) Clean the surface of the substrate to be clad with absolute ethanol;

[0039] (2) Preheating the surface of the substrate with a flame spray gun, the preheating temperature is 200°C;

[0040] (3) Place the coaxial powder feeder on the ultrasonic vibration table through the pressing device, and apply ultrasonic vibration to it, and the ultrasonic vibration power is 2000W;

[0041] (4) The ultrasonic vibrating table is connected to the coaxial powder feeding head through a rigid bracket, so that it has the same frequency as the ultrasonic vibrating table, and ensures that the coaxial powder feeding head is ...

Embodiment 2

[0047] In this implementation, the components of the cladding alloy material and the weight percentages of each component are: C powder: 1.00%, Si powder: 0.3%, Mn powder: 0.35%, Mo powder: 5.05%, and the balance is Fe Powder, the components are all powders with a purity greater than 99%, and the particle size is: 135-325 mesh. Also includes the following steps:

[0048] (1) Clean the surface of the substrate to be clad with absolute ethanol;

[0049] (2) Preheating the surface of the substrate with a flame spray gun, the preheating temperature is 300°C;

[0050] (3) Place the coaxial powder feeder on the ultrasonic vibration table through the pressing device, and apply ultrasonic vibration to it, and the ultrasonic vibration power is 3000W;

[0051] (4) The ultrasonic vibrating table is connected to the coaxial powder feeding head through a rigid bracket, so that it has the same frequency as the ultrasonic vibrating table, and ensures that the coaxial powder feeding head is i...

Embodiment 3

[0057] In this implementation, the components of the cladding alloy material and the weight percentages of each component are: C powder: 0.95%, Si powder: 0.3%, Mn powder: 0.3%, Mo powder: 5.05%, and the balance is Fe Powder, the components are all powders with a purity greater than 99%, and the particle size is: 135-325 mesh. Also includes the following steps:

[0058] (1) Clean the surface of the substrate to be clad with absolute ethanol;

[0059] (2) Preheating the surface of the substrate with a flame spray gun, the preheating temperature is 250°C;

[0060] (3) Place the coaxial powder feeder on the ultrasonic vibration table through the pressing device, and apply ultrasonic vibration to it, and the ultrasonic vibration power is 2500W;

[0061] (4) The ultrasonic vibrating table is connected to the coaxial powder feeding head through a rigid bracket, so that it has the same frequency as the ultrasonic vibrating table, and ensures that the coaxial powder feeding head is ...

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Abstract

The invention discloses a method for preparing a defect-free high-hardness laser cladding layer through coaxial powder feeding, and relates to the technical field of metal surface engineering. The method comprises the steps that the surface of a base material is cleaned; the surface of the base material is preheated through a flame spray gun; a coaxial powder feeder is placed on an ultrasonic vibration table, and ultrasonic vibration is applied to the coaxial powder feeder; the ultrasonic vibration table is connected with a coaxial powder feeding head through a rigid support, so that the ultrasonic vibration table and the coaxial powder feeding head have the same frequency, and the coaxial powder feeding head is independent of a laser head and a machining mechanical arm; alloy powder conveyed in place through coaxial powder feeding is scanned through lasers, and the cladding layer is obtained; dye penetrant inspection is carried out on the cladding layer; and the cladding layer is ground. According to the method, the kinetic energy of alloy powder particles is effectively improved, and therefore the fluidity of molten pool liquid metal is improved, and the structure distribution of the cladding layer is more uniform; and the high-hardness cladding layer prepared through the method is free of cracks, air holes, inclusions and other defects.

Description

technical field [0001] The invention relates to the technical field of metal surface engineering, in particular to a method for coaxial powder feeding to prepare a defect-free high-hardness laser cladding layer. Background technique [0002] High-hardness, high-wear-resistant linings are one of the most used consumables in metallurgy, mining and cement industries. Traditional cast high-manganese steel wear-resistant linings often do not have the characteristics of impact strengthening due to wear conditions, resulting in high-manganese steel linings. Short-term failure. It has outstanding advantages to prepare high-hardness and high-wear-resistant liners on the surface of alloy structural steel by laser cladding, and can also realize remanufacturing, which greatly reduces material consumption and enterprise costs. Laser cladding can produce alloy cladding layers with special properties on the surface of metal substrates, such as preparing cladding layers with high hardness,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C38/02C22C38/04C22C38/12
CPCC23C24/106C22C38/02C22C38/04C22C38/12Y02P10/25
Inventor 琚伟琳
Owner YANSHAN UNIV
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