Method and device for conducting laser cladding with assistance of electromagnetic stirring in forced cooling environment

Abstract

The invention provides a method and device for conducting laser cladding with the assistance of electromagnetic stirring in a forced cooling environment. The device comprises a fiber laser, a liquid nitrogen forced cooling platform, an electromagnetic stirring platform, a temperature detection and feedback system and a computer control system. The method comprises the steps that a sample is placed on a special clamp made of red copper, the red copper clamp is forcibly cooled through liquid nitrogen, then cold is indirectly transmitted to the sample, and thus forced cooling of the sample in the laser cladding process is achieved. Meanwhile, the magnetic field intensity of the electromagnetic stirring platform is adjusted and controlled through a computer, and thus the laser cladding process with the assistance of electromagnetic stirring under forced cooling is achieved. According to the method and device for conducting laser cladding with the assistance of electromagnetic stirring in the forced cooling environment, laser cladding is conducted with the assistance of forced cooling and electromagnetic stirring to prepare a composite coating so that the good metallurgical bonding capacity of the composite coating with a matrix can be remarkably improved, a hard phase and uniform tissue distribution in the clad coating are achieved, grains are refined, and stress concentration is avoided; and defects such as cracks and pores of the laser clad coating are eliminated, and the quality of the clad coating is improved.

Description

technical field [0001] The invention relates to a method and device for laser cladding assisted by electromagnetic stirring in a forced cooling environment, and belongs to the technical field of laser processing and material surface modification equipment. Background technique [0002] In recent years, domestic and foreign studies on laser cladding metal-based ceramic reinforced particle composite coatings are more hard composite coatings in which ceramic phases such as WC and SiC are added to Ni and Co-based powders. Among them, WC is a hard material with excellent wear resistance, which can be formed into hard alloy or corresponding wear-resistant material and composite coating by means of the carcass metal which acts as a brazing filler metal. Ni-based alloys have good wettability to WC. Therefore, laser cladding WC particle reinforced Ni-based alloy coating has been widely used in the industry because of its excellent wear resistance and moderate price. At present, the...

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Problems solved by technology

Chinese patent CN102703898A discloses a method and device for refining the solidified structure of the laser cladding layer with an alternating magnetic field. The method for refining the structure of the laser cladding layer with an alternating magnetic field realizes the refinement of the cladding layer grains and the structure Uniform distribution and avoiding stress concentration have achieved the purpose of eliminating cracks in the laser cladding layer and improving the quality. However, using electromagnetic stirring to assist laser cladding metal-based ceramic reinforced particle composite coatings may break the cladding layer and the substrate. The dendritic structure is formed by solidification in the area, which causes the problem of weakening the bonding strength between the cladding layer and the substrate, and cannot effectively solve the problem of the metallurgical bonding strength between the composite coating and the substrate.

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