Laser-clad welding high-entropy alloy AlCoCrFeNi/27SiMn steel composite layer and preparing method thereof

Abstract

The invention provides a preparing method of a laser-clad welding high-entropy alloy AlCoCrFeNi/27SiMn steel composite layer. The preparing method comprises the following steps of 1) preparing a high-entropy alloy AlCoCrFeNi raw material, putting the raw material into a melting furnace, and using an extraction system to extract the vacuum degree to be within 5*10<-3> Pa, then stopping the extraction system, and filling the smelting furnace with argon until the pressure is 0.01 atm; 2) adjusting a smelting electric arc gun to the position over the raw material to conduct smelting, and then cooling the raw material; 3) processing the smelted high-entropy alloy AlCoCrFeNi into metal flakes, covering 27SiMn steel cylinders with the metal flakes, and adopting laser welding to perform multiple overlap welding on the metal flakes and the cylinders; and 4) extruding the metal flakes so that the metal flakes are attached to the cylinders, conducting diameter reduction and fusing, and preparingthe high-entropy alloy AlCoCrFeNi/27SiMn steel composite layer. The yield stress of the composite layer prepared by the method is greater than that of a high-entropy alloy AlCoCrFeNi base material, the friction coefficient of the composite layer is smaller than that of the high-entropy alloy AlCoCrFeNi base material, and the wear resistance and corrosion resistance of the composite layer are moreexcellent.

Description

technical field [0001] The invention relates to the field of welding, in particular to a high-entropy alloy AlCoCrFeNi / 27SiMn steel composite layer and a preparation method thereof. Background technique [0002] The working conditions of the hydraulic support column are harsh, mainly working under the conditions of heavy load, vibration, impact, friction and medium corrosion. In addition, the overall equipment is surrounded by dust, water vapor and harmful gases, and the lubrication conditions are poor. The main failure mode of the hydraulic support column is corrosion and wear, so the surface treatment technology of the column is a key factor affecting the service life of the hydraulic support. [0003] The first-generation column surface treatment technology is electrochrome plating and chemical plating technology, which will not only produce electroplating wastewater containing heavy metal ions and various types of acid mist waste gas, but also cause great health hazards...

AI Technical Summary

Problems solved by technology

[0003] The first-generation column surface treatment technology is electrochrome plating and chemical plating technology, which will not only produce electroplating wastewater containing heavy metal ions and various types of acid mist waste gas, but also cause great health hazards to operators and serious environmental pollution, affecting the service life of the column. Increase the overall maintenance cost of hydraulic supports, and seriously endanger the safety of hydraulic support products

[0004] The second-generation column surface treatment technology is plasma spraying and laser cladding technology, using alloy powder as raw material, powder production has a series of shortcomings such as high cost and long cycle, and powder processing is prone to defects such as pores and cracks. It is easy to generate residual stress. In addition, during the production process, the suspended particles in the air will increase, which is very harmful to the health of operators.

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