Preparation method of high-strength/toughness super-high manganese steel-based TiC/TiN steel bonded hard alloy

Abstract

The invention relates to a preparation method of a high-strength / toughness super-high manganese steel-based TiC / TiN steel bonded hard alloy. The preparation method is characterized by mixing one of TiO2 powder, TiH2 powder or Ti powder with colloidal graphite according to a C / Ti atomic proportion of 0.7 to 1.1, thus preparing in-situ synthetic TiC powder; mixing one of the TiO2 powder, the TiH2 powder or the Ti powder with urea ((NH2)2CO) according to an N / Ti atomic proportion of 0.4 to 1.1, thus preparing in-situ synthetic TiN mixed powder; preparing Mo-Fe powder, V-Fe powder, Cr-Fe powder, Mn-Fe powder, Si-Fe powder, Fe powder, Ni powder, the colloidal graphite and a rare-earth raw material according to proportions required by adhesive-phase metal chemical component mass proportions, filling and ball-milling in a steel ball, adding absolute ethyl alcohol as a medium and PVA (Polyvinyl Acetate) in the steel ball, drying slurry after ball milling, pressing, forming and sintering, thus obtaining steel bonded alloy. According to the preparation method disclosed by the invention, an in-situ reaction synthesis technology and a liquid-phase sintering technology are combined, the particle size is small, the surface has no sharp corner, a matrix interface is better in bonding, and the interface is clear. The preparation method of the steel bonded alloy is capable of increasing the comprehensive mechanical property of the alloy, the cost is low, and the technology is simple and convenient.

Description

[0001] field of invention [0002] The invention relates to a preparation method of high-strength, toughness and ultra-high manganese steel-based TiC / TiN steel-bonded hard alloy, in particular to the technical field of preparing high-strength, toughness and ultra-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 material...

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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.