Preparation method for high-toughness modified high-manganese steel-based TiC/TiN steel-bonded hard alloy

Abstract

The invention relates to a preparation method for high-toughness modified high-manganese steel-based TiC / TiN steel-bonded hard alloy. The preparation method is characterized in that one of Ti02 powder, TiH2 powder or Ti powder and colloidal graphite powder are prepared according to the atomic ratio being 0.7-1.1 to be in-situ synthesized TiC mixed powder; one of Ti02 powder, TiH2 powder or Ti powder and urea ((NH2)2CO) are prepared according the atomic ratio being 0.4-1.1 to be in-situ synthesized TiN mixed powder; ferromolybdenum powder, ferrovanadium powder, ferrochrome powder, ferromanganese powder, ferrosilicon powder, ferrous powder, nickel powder, colloidal graphite and rare earth raw materials are prepared according to the needed proportion of the adhesive phase metal chemical composition mass ratio; steel balls are stored, and ball milling is conducted, wherein absolute ethyl alcohol is added to serve as a medium and PVA; and after ball milling is conducted, slurry is dried and then subjected to pressing forming, sintering is conducted, and the steel-bonded alloy is obtained. According to the preparation method, in-situ reaction synthetic technology and liquid phase sintering technology are combined, the fineness of particle sizes is enhanced, the surface has no sharp corners, combination of the substrate interface is good, and the interface is clean; the preparation method for the steel-boned alloy can improve the comprehensive mechanical property of the alloy, the price is low, and the technique is simple and convenient.

Description

[0001] field of invention [0002] The invention relates to a method for preparing a high-strength and toughness modified high-manganese steel-based TiC / TiN steel-bonded hard alloy, in particular to the technical field of preparing a high-strength and toughness modified high-manganese steel-based TiC / TiN steel-bonded hard alloy by a reaction sintering method . [0003] Background of the invention [0004] Cemented carbide (WC-Co alloy) is one of the most commonly used materials in the cutting tool industry. Due to the high cost and toxicity of cemented carbide raw materials, in recent years, material workers have begun to look for alternative materials to replace WC-Co cemented carbide Materials, one factor that plays a driving role is that the cost of Co raw materials has risen in recent years, and the price fluctuates greatly; the other factor is that with the continuous development of modern industry, higher requirements are put forward for cemented carbide materials. Alloy...

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Problems solved by technology

[0024] 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 complex 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, the preparation cost is higher than the existing process, and it is not suitable for large-scale production.