Preparation method of tungsten carbide particle enhanced steel-base surface layer composite bar

Abstract

The invention discloses a preparation method of a tungsten carbide particle enhanced steel-base surface layer composite bar. The method comprises the following steps of: coating recarbonizer on the cavity surface of a sand mould; acid-washing the tungsten filament to be used as a strengthening phase and making into a spiral shape; placing the spiral-shaped tungsten filament in the cavity, and pouring, wherein after the metal liquid is solidified to room temperature, a metal steel bar is obtained; removing rust of the surface of the metal bar; then coating a support film on the outer surface of the metal bar; after the support film is dried, performing surface rapid zone melting through a zone melting sensor, and performing rapid solidification, wherein the heating temperature for the surface rapid zone melting is controlled to be 20-30 DEG C higher than the melting point of the base material; after the zone melting, performing thermal treatment on the metal bar; and then performing cutting, mechanical straightening and the like to achieve the required size to finally obtain the tungsten carbide particle enhanced steel-base surface layer composite bar. The tungsten carbide particleenhanced steel-base surface layer composite bar not only maintains the characteristics of good toughness and plasticity of metal materials, but also has strong wear resistance. The thickness of a WC composite layer can reach 10-15 mm, and the hardness HRC can reach 50-56. The invention is easy to realize large-scale industrial production.

Description

technical field [0001] The invention relates to the preparation of composite rods, in particular to a preparation method of tungsten carbide particle-reinforced steel-based surface layer composite metal rods. Background technique [0002] Wear-resistant steel rods are suitable for many users of rod mills and coal mills in cement plants, power plants, mines, quartz sand plants, silica sand plants, sand aerated, coal chemical, aerated concrete plants, etc. The market demand is huge. The steel rods used in the market are made by rolling steel in steel mills. Due to their poor wear resistance, they generally have a short service life and consume a lot during use, resulting in a large waste of resources. The operating conditions of rod mills and coal mills require steel rods to have high wear resistance, as well as high strength and toughness. High wear resistance requires the hardness of the material to be high, and excessive hardness will lead to a decrease in the toughness of...

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Problems solved by technology

However, this process must use a large amount of binder, resulting in a large number of porosity and slag inclusions

In order to solve the problems of uneven dispersion of ceramic particles and difficu...

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