Preparation method of hard alloy/high-chromium alloy-based wear-resistant composite material

Abstract

The invention provides a preparation method of a hard alloy / high-chromium alloy-based wear-resistant composite material, which comprises the following steps: firstly manufacturing a hard alloy / enhancement body, welding an iron nail at one end of the hard alloy enhancement body, then plating a metal buffer layer on the surface of the hard alloy enhancement body welded with the iron nail, further manufacturing a wearable element model, further inserting the well prepared hard alloy into the wearable element model on the premise of enabling the iron nail to face towards outside, adopting the expendable pattern casting process to cast high-chromium alloy, taking out a cast after casting molding, cutting off the iron nail, using a diamond grinding wheel to polish the working surface to be smooth, and then performing heat treatment on a workpiece. The composite material is uniform in distribution of enhancement phase, large in controllable range of volume fraction, small in residual stress of an interface, small in heat-affected zone and good in combination, hard alloy of the composite material is positioned in the surface layer of the working surface of a wearable element, the thickness is 10-15mm, and the composite material can be used for manufacturing normal-temperature or high-temperature wear-resistant wearable elements in the fields of mines, building, metallurgy, electric power and the like.

Description

technical field [0001] The invention relates to the technical field of manufacture of wear-resistant composite materials, in particular to a method for preparing a hard alloy / high chromium alloy-based wear-resistant composite material. Background technique [0002] Cemented carbide has a series of excellent properties such as high hardness, wear resistance, heat resistance, and corrosion resistance, and is widely used in metal processing, mining and other fields. However, hard alloys are expensive to manufacture and brittle, so they are not suitable for impact Wear parts with high force. In addition, with the rapid development of my country's industry, the application scope and consumption of cemented carbide are also increasing year by year. Various scrapped cemented carbide tools such as drills, milling cutters, reamers, turning tools, etc. It also increases accordingly; due to the serious problems of high energy consumption, complex equipment, and environmental pollution ...

AI Technical Summary

Problems solved by technology

[0004] Although some cemented carbide / iron-based composite products have been applied in industry and have achieved certain economic benefits, their scope of use is still limited due to the following problems

(1) Due to the great difference in the linear (expansion) coefficients of cemented carbide and iron-based alloys, a large residual stress will be generated at the interface. During the subsequent heat treatment and use, the workpiece is easy to crack, especially with the hardness As the volume fraction of the alloy increases, the residual stress also increases accordingly, resulting in frequent cracking of the composite material during preparation, heat treatment and use, and it is impossible to prepare a high wear-resistant composite material with a high volume fraction (greater than 30%) of the reinforcing phase

Images