Process method for increasing laser cladding high hardness alloy layer thickness and laser cladding repaired products of process method

Abstract

The invention discloses a process method for increasing the laser cladding high hardness alloy layer thickness. According to the process method for increasing the laser cladding high hardness alloy layer thickness, the stress distribution sate is obtained by finite element analysis according to technical requirements, and then the cutting line position and size of a cladding area are designed, a cladding process is confirmed, and partitioned cladding and cutting line cladding filling are performed. By means of the laser cladding process of the process method, the alloy layer thickness can be effectively increased, cracks and other defects are not prone to being generated, the working procedure of heat preservation is not needed, the production efficiency is fundamentally improved, the process method for increasing the laser cladding high hardness alloy layer thickness and laser cladding repaired products of the process method have great economic benefits, and under the condition of thesame performance, the numerical ratio of process cost / product life can be reduced utilizing the process method.

Description

technical field [0001] The invention belongs to the technical field of laser surface modification, and in particular relates to a process method for increasing the thickness of a laser cladding high-hardness alloy layer and a laser cladding repair product thereof. Background technique [0002] Laser cladding is a laser surface modification technology that uses high-energy-density laser beams to clad powder materials on the surface of parts to obtain coatings with excellent mechanical properties. The liquid alloy formed after the powder is melted by the laser beam is rapidly solidified and crystallized due to the rapid heat conduction of the matrix material, which not only produces a firm and good metallurgical bond, but also obtains a fine and uniform microstructure (that is, the coating Excellent microstructure), so a surface coating with very excellent mechanical properties, wear resistance and corrosion resistance can be obtained. [0003] Laser cladding can be divided i...

AI Technical Summary

Problems solved by technology

Due to the use of laser as the heat source, the molten metal has a very high temperature gradient during solidification, resulting in a large internal stress after solidification of the alloy layer, and an increased tendency to crack. Compared with other fusion welding preparation alloy layer processes, the same Alloy layer material, laser cladding process has a big disadvantage in thickness

In order to increase the thickness of the alloy layer, the use of transition layer and preheating and heat preservation are two commonly used methods, but these two methods still have their own problems: although the method of using the transition layer seems to increase the thickness of the alloy layer, but It cannot fundamentally improve the service life of the alloy layer; although the method of preheating and heat preservation can increase the thickness of the alloy layer to a certain extent, it also increases equipment and time costs and reduces production efficiency

[0005] After searching, no method has been found that can effectively increase the alloy thickness of laser cladding without increasing the process steps, save production costs and improve production efficiency

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