Preparation method for high strength and toughness modified high manganese steel based TiN steel bonded cemented carbide

Abstract

The invention relates to a preparation method for high strength and toughness modified high manganese steel based TiN steel bonded cemented carbide. The preparation method is characterized in that in-situ synthesis TiN powder is prepared, wherein one or three of TiO2 powder, TiH2 powder and Ti powder and urea ((NH2)2CO) are prepared into the in-situ synthesis TiN mixed powder according to the N / Ti atomic ratio being 0.4-1.1; molybdenum iron powder, vanadium iron powder, chrome iron powder, ferromanganese powder, ferrosilicon powder, iron powder, nickel powder, colloidal graphite and rare earth raw materials are prepared according to the required mass ratio of bonding-phase metal chemical compositions, the raw materials are put into a steel ball for ball milling, anhydrous ethanol are added to serve as a medium and PVA, slurry obtained after ball milling is dried to be pressed and formed, sintering is conducted, and the TiN steel bonded cemented carbide is obtained. According to the preparation method, an in-situ reaction synthesis technology is combined with a liquid-phase sintering technology, strengthening particles are wee in size, the surfaces of the particles are free of sharp corners, the base body interface bonding is good, and the interface is clean. By means of the preparation method for the steel bonded cemented carbide, the comprehensive mechanical performance of the cemented carbide can be improved, the cost is low, and the process is simple and convenient to implement.

Description

[0001] field of invention [0002] The invention relates to a preparation method of a high-strength and toughness modified high manganese steel-based TiN steel-bonded hard alloy, in particular to the technical field of preparing a high-strength and toughness modified high-manganese steel-based TiN steel-bonded hard alloy by a reaction sintering method. [0003] Background of the invention [0004] Steel-bonded cemented carbide (hereinafter referred to as steel-bonded alloy) is produced between cemented carbide and alloy tool steel, die steel and high-speed steel with steel as the matrix, tungsten carbide, titanium carbide, etc. Between high-life mold materials and engineering materials. The proportion range of steel bonded alloy steel matrix binder phase and hard phase is quite wide, which determines that it has the following excellent properties: 1) Wide range of process properties, mainly forgeability, machinability and heat treatability and solderability. 2) Good physical ...

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Problems solved by technology

[0019] However, the in-situ synthesis method also has many disadvantages: the reinforced particles are limited to thermodynamically stable particles in a specific matrix; the generated ones are relatively complicated and difficult to control; After the bit particles are formed, they often segregate in dendrite gaps or grain boundaries during the casting process, which adversely affects the structure and properties of the material, and the processability is poor, and the preparation cost is higher than the existing process, so it is not suitable for large-scale production.