Method and device for preparing high-entropy alloy coating through alternating-current and direct-current composite magnetic field with assistance of laser cladding

Abstract

The invention provides a method and device for preparing a high-entropy alloy coating through an alternating-current and direct-current composite magnetic field with assistance of laser cladding. Thedevice comprises a transverse direct-current magnetic field generating device, a longitudinal alternating-current magnetic field generating device and a position moving mechanism, and the method comprises the steps that a base material is placed on an upper supporting plate with a clamp, an alternating-current / direct-current power module of an alternating-current / direct-current power supply is started through a controller to supply power to a rectangular magnet exciting coil I and a magnet exciting coil II, a longitudinal alternating-current magnetic field and a transverse steady direct-current magnetic field are synchronously generated; and meanwhile, the controller controls the position moving mechanism and a robot, a moving nut drives the alternating current magnetic field generating device to follow a laser cladding head, it is ensured that the upper end of square silicon steel always corresponds to a laser molten pool, and the molten pool is subjected to the equal-strength alternating / direct current magnetic field synergistic effect at each moment. According to the method and device for preparing the high-entropy alloy coating through the alternating-current and direct-currentcomposite magnetic field with assistance of laser cladding, effectively regulating and controlling the microstructure form and solute distribution in the high-entropy alloy coating through laser cladding are carried out through the synergistic effect of the alternating current magnetic field and the direct current magnetic field, and the high-performance high-entropy alloy coating which is uniform in structure distribution and remarkably improved in component segregation can be obtained.

Description

technical field [0001] The invention relates to the technical field of preparation of high-entropy alloy coatings, in particular to a method for synergistically regulating the structure and composition of laser cladding high-entropy alloy coatings by an AC magnetic field and a DC magnetic field. Background technique [0002] High-entropy alloy (HEA) is a multi-component composed of more than 5 elements in equiatomic ratio or near equiatomic ratio. Compared with traditional alloys, high-entropy alloys have excellent properties such as high hardness, high strength, high corrosion resistance, high wear resistance, and high temperature stability. The preparation of high entropy alloys mainly focuses on bulk, thin film and coating. Among them, bulk and thin-film high-entropy alloys have certain limitations in industrial application due to their high preparation costs, easy metallurgical defects, difficulty in preparing large-sized, complex-structured components and thin-film thi...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of component segregation caused by numerous elements and uneven tissue distribution caused by huge temperature gradient in the laser cladding preparation of existing high-entropy alloy coatings, and to invent an AC / DC composite magnetic field assisted laser cladding high The method of high-entropy alloy coating with high performance, and a corresponding device is provided at the same time, which effectively regulates the microstructure and solute distribution in the laser cladding high-entropy alloy coating through the synergistic effect of AC magnetic field and DC magnetic field, and then obtains High-performance high-entropy alloy coating with uniform structure distribution and significantly improved composition segregation

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