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Method for preparing multi-metal-based coating by compounding plasma cladding and friction stir welding on steel surface and prepared coating

A plasma cladding and friction stir welding technology, applied in metal material coating process, coating, welding equipment and other directions, can solve the problems of slag inclusion, coating cracks, etc., to improve bonding performance, reduce costs, and simple process Effect

Pending Publication Date: 2021-10-19
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the rapid heating and cooling of plasma cladding, the mismatch between the material properties of the alloy coating and the substrate, thermal stress exists after plasma cladding, which leads to cracks in the coating, and defects such as pores and slag inclusions.

Method used

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  • Method for preparing multi-metal-based coating by compounding plasma cladding and friction stir welding on steel surface and prepared coating
  • Method for preparing multi-metal-based coating by compounding plasma cladding and friction stir welding on steel surface and prepared coating
  • Method for preparing multi-metal-based coating by compounding plasma cladding and friction stir welding on steel surface and prepared coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this example, high-manganese steel is selected as the substrate, and low-carbon Fe-Ni alloy powder is used as the cladding powder. The process flow for preparing a multi-alloy coating is as follows figure 1 shown.

[0037] First, pre-treat the substrate before cladding, including water toughening treatment, grinding with a grinder, and cleaning with acetone, etc., to remove stains on the surface; the cladding powder needs to be vacuum-dried (dried at 80-90°C for 1 hour), and the treated The powder is fed into the powder feeding device of the plasma cladding equipment, and the plasma cladding is carried out by using the synchronous powder feeding method. The flow rate is set to 5L / min; the temperature of the cladding layer is detected by an infrared thermal imager. When the temperature drops to the recrystallization temperature region, friction stir welding is immediately performed on the cladding layer. The process parameters are: the axial force of the stirring need...

Embodiment 2

[0041] Other specific implementation conditions are the same as Example 1, changing the friction stir welding process parameters, as follows: the axial force of the stirring needle is 15kN, the rotating speed of the stirring needle is 600r / min, the welding speed is 130mm / min, the offset is 0.5mm, and the shielding gas The flow rate is 15L / min; the aging treatment is carried out on the samples after friction stir welding. The optimal aging temperature is 500°C, heat preservation for 5h, then take them out and cool them in the air.

Embodiment 3

[0043] Other specific implementation conditions are the same as in Example 1, changing the friction stir welding process parameters, as follows: the axial force of the stirring needle is 15kN, the rotating speed of the stirring needle is 600r / min, the welding speed is 160mm / min, the offset is 0.6mm, and the shielding gas The flow rate is 22L / min; the aging treatment is carried out on the samples after friction stir welding. The optimal aging temperature is 500°C, keep warm for 5h, then take them out and cool them in the air.

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Abstract

The invention belongs to the technical field of cladding repair, and discloses a method for preparing a multi-metal-based coating by compounding plasma cladding and friction stir welding on a steel surface and the prepared coating. Non-oxidizing plasma beams are used for cladding alloy powder or wires on the surface of a base body to form a molten alloy coating, when the temperature of a cladding area is lowered to be within a recrystallization temperature area range, friction stir welding treatment is conducted on the coating immediately, and a composite coating with excellent comprehensive mechanical performance can be formed. Heat after plasma cladding is used as energy for plastic deformation of a friction stir welding material, the step of re-heat treatment before composite friction stir welding is eliminated, and the process is simpler and more convenient. By means of friction stir welding, a non-equilibrium solidified cladding area structure can be changed under quick heating and quick cooling, growing dendritic crystals can be crushed to form more crystal cores, and the effect of refining crystal grains is achieved. By means of friction stir welding, the quality problems of air holes, slag inclusion and the like in a cladding alloy melt can be improved, and thermal stress of a cladding area can be released.

Description

technical field [0001] The invention belongs to the technical field of cladding repair, and in particular relates to a method for preparing a multi-metal-based coating by combining plasma cladding and friction stir welding on a steel surface and the prepared coating. Background technique [0002] Plasma surface cladding is developed after plasma spray welding, surfacing, laser cladding and other surface technologies. Its basic principle is: use high-temperature plasma beam as heat source, rapidly heat alloy powder and workpiece substrate surface and melt and mix together , diffusion, reaction, solidification, forming a layer of high hardness and wear-resistant layer on the surface, which has the advantages of good combination with the substrate, low equipment cost, no pollution in the working environment and simple operation, so this technology is suitable for dealing with impact resistance, wear resistance and Corrosion-resistant metal parts, is a promising technology for m...

Claims

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Application Information

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IPC IPC(8): C23C24/10C23C26/02C21D1/00C21D6/00B23K9/12
CPCC23C24/106C23C26/02C21D1/00C21D6/001B23K9/122
Inventor 朱志刚胡永俊李风成晓玲舒畅
Owner GUANGDONG UNIV OF TECH