A process method for increasing the thickness of laser cladding high-hardness alloy layer and its laser cladding repair product

Abstract

The process method for increasing the thickness of the laser cladding high-hardness alloy layer disclosed by the present invention obtains the stress distribution state by means of finite element analysis according to technical requirements, and then designs the cutting line position and size of the cladding area, determines the cladding process, and performs block segmentation Cladding and cutting line cladding filling. The laser cladding process of this method can effectively increase the thickness of the alloy layer, is not easy to produce defects such as cracks, does not require a heat preservation process, fundamentally improves production efficiency, and has huge economic benefits. Under the condition of the same performance, using the process method can reduce the numerical ratio of process cost / product life.

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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