A kind of laser cladding welding high-entropy alloy alcocrfeni/27simn steel composite layer and its preparation method

Abstract

The invention provides a method for preparing a composite layer of laser cladding welding high-entropy alloy AlCoCrFeNi / 27SiMn steel, comprising the following steps: 1) preparing high-entropy alloy AlCoCrFeNi raw materials, putting the raw materials into a smelting furnace, and adopting an air pumping system to pump the vacuum to 5×10 ‑3 Within Pa, then close the exhaust system and fill it with argon until the pressure is 0.01 atm; 2) Adjust the melting arc torch to melt directly above the raw material, and then let the raw material cool; 3) Process the smelted high-entropy alloy AlCoCrFeNi into metal Thin sheet, the metal sheet is covered on the 27SiMn steel cylinder, and laser welding is used to perform multi-pass lap welding on the metal sheet and the cylinder; 4) Extrude the metal sheet to make the metal sheet fit the cylinder and reduce the diameter , fusion, and a high-entropy alloy AlCoCrFeNi / 27SiMn steel composite layer is obtained. The yield stress of the composite layer prepared by the invention is greater than that of the 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 more excellent.

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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