Preparation method of high-temperature wear-resistant layer on surface of blade crown of turbine blade

Abstract

The invention discloses a preparation method of a high-temperature wear-resistant layer on the surface of a blade crown of a turbine blade, and relates to the technical field of additive manufacturing. Selected devices comprise an industrial robot, a laser, a flexible clamp and a special variable-frequency wire feeding system, and the special variable-frequency wire feeding system is connected to the tail end of the laser through the flexible clamp and moves synchronously with the laser. According to the method, the high-temperature wear-resistant layer on the surface of the blade crown of the turbine blade is manufactured in a laser fuse deposition mode, the heat input amount is reduced, element exchange between interfaces is controlled, the interface thickness is reduced, grains are refined, and the defects of air holes, cracks, incomplete fusion and the like are restrained. The forming quality and performance of the high-temperature wear-resistant layer on the surface of the blade crown are improved, and the method is particularly suitable for efficient surface cladding and additive manufacturing of the high-temperature wear-resistant layer on the surface of the blade crown of the turbine blade through an industrial robot.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a method for preparing a high-temperature wear-resistant layer on the surface of a blade shroud of a turbine blade. Background technique [0002] Traditional methods of high-temperature wear-resistant layer on the surface of the turbine blade shroud usually include: laser cladding powder surfacing, plasma arc surfacing, TIG surfacing, brazing and HVOF, etc. Among them, laser cladding powder surfacing, plasma arc surfacing The deposition material used in welding and HVOF is powder, TIG surfacing uses wire as the material for deposition, and brazing is to directly weld the high-temperature wear-resistant layer prepared in advance to the surface of the blade crown by brazing; and Whether the high temperature wear-resistant layer is prepared by powder, wire or brazing, each has its own advantages and disadvantages, and different preparation methods have dif...

AI Technical Summary

Problems solved by technology

[0004] Since cobalt-based superalloys have the characteristics of high hardness, good wear resistance, and poor machinability, brazing is the earliest method for preparing the high-temperature wear-resistant layer on the surface of the turbine engine blade shroud. The advantages of simplicity and small heat input have little effect on the blade crystal orientation; however, brazing is used as a method for preparing the high-temperature wear-resistant layer on the surface of the blade crown, and there are congenital defects of poor surface bonding, which can easily cause the high-temperature wear-resistant layer to fall off;

[0005] The heat input provided by HVOF is also small, and there is no high-temperature oxidation, gasification, melting, crystallization, etc., but because it uses powder as the deposition material of the high-temperature wear-resistant layer, the powder is physically processed during the deposition process. In combination, the deposit layer is often accompanied by defects such as pores, cracks, and poor compactness. During the working process of the turbine blade, it is easy to cause the high-temperature wear-resistant layer to fall off in blocks, and it is also difficult to meet the high-temperature wear resistance requirements of the turbine engine blade; The emergence of laser cladding powder surfacing and plasma arc surfacing technology has effectively solved the problem of poor material bonding in HVOF technology; Defects such as lack of fusion still exist

[0006] TIG surfacing is a commonly used method for preparing high-temperature wear-resistant layers at this stage. The deposition material wire used as the deposition material effectively avoids the problems of porosity and poor compactness when the powder is deposited. Positive energy source, the increase of heat input leads to the thickening of the interface thickness, which is easy to produce liquefaction cracks; at the same time, due to the high brittleness of the cobalt-based alloy wire, the wire cannot be bent. shape" wire, the high temperature wear-resistant layer is prepared by TIG surfacing, usually by manual tungsten argon arc welding

This greatly reduces the efficiency of processing and manufacturing, and it is difficult to guarantee the deposition quality of the high-temperature wear-resistant layer, resulting in an increase in the scrap rate