Electric-arc fusion-cladding powder core wire, and preparation method of high-entropy alloy coating

Abstract

The invention provides an electric-arc fusion-cladding powder core wire, and a preparation method of a high-entropy alloy coating. The powder core wire is composed of a stainless steel strip and a powder core, wherein the thickness of the stainless steel strip is 0.8mm, and the powder core is powder of Mn, Cr, Fe, Ni, and Cu in a molar ratio of 2:2:2:2:1. A preparation method of the powder core wire comprises the following steps: (1) preparing the powder core; (2) paving powder and sintering; (3) performing cold rolling; and (4) coiling, drawing wires, reeling, installing coiled wires on a wire feeder, and spraying-deposing fused core wires on the surfaces of base materials by setting the electric-arc welding voltage to be 14 V, current to be 150A, and speed to be 8cm2 / min under the actionof 0.9MP high-pressure argon to form the high-entropy alloy coating.

Description

technical field [0001] The invention belongs to the field of material processing engineering thermal spraying, and in particular relates to a preparation method of arc welding powder core wire material and high-entropy alloy coating thereof. Background technique [0002] Compared with traditional alloys, high-entropy alloys use five or more metal elements as principal components, and the mole fraction ratio of each principal component is equal or similar, and has multi-principal effect, high-entropy effect, slow diffusion effect, strong The structural lattice distortion effect and the cocktail effect in terms of performance form a simple solid solution phase structure, including a face-centered cubic structure (FCC) phase and a body-centered cubic structure (BCC) phase. High-entropy alloys exhibit superior comprehensive properties unmatched by traditional alloys, such as high strength, high hardness, high wear resistance, corrosion resistance, and high-temperature oxidation ...

AI Technical Summary

Problems solved by technology

One of the key technologies for preparing high-entropy alloy coatings by arc deposition is the preparation of powder core wires. The current powder core wires used for arc deposition have two shortcomings: (1) powder leakage problem, the existing powder cores The wire material preparation method mainly includes processes such as powder blending, powder mixing, powder filling, sealing, wire rolling, wire drawing, wire winding, and packaging. powder phenomenon

(2) The high-performance powder core wire has poor versatility, and the prepared coating cannot meet the requirements of high hardness, high wear resistance, high impact strength and high temperature corrosion resistance of the workpiece at the same time

The disadvantage of this method is that the electrode material is short and cannot realize automatic wire feeding, and it is not easy to realize automation. In addition, after the electrode material is melted, the coating is cooled naturally, and the porosity is high and the structure is not dense.

After comparing the existing technical schemes, the high-entropy alloy coating is mainly prepared by laser cladding high-entropy alloy powder, and all powder core wire materials are mainly used for the preparation of metal compound coatings and amorphous coatings, and there is no public use of electric arc. Preparation of high-entropy alloy coating by welding powder core wire and the preparation of the powder core wire used

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