A kind of preparation method of tic high-boron low-alloy high-speed steel-based steel-bonded hard alloy

Abstract

The invention relates to a preparation method of TiC high-boron low-alloy high-speed steel-based steel-bonded hard alloy. Titanium and graphite powder are prepared according to the atomic molar ratio of C / Ti of 0.7-1.1 to prepare in-situ synthesized TiC mixed powder; Ferrovanadium powder, ferrochromium powder, ferromolybdenum powder, ferroboron powder, ferrosilicon powder, ferromanganese powder, iron powder, nickel powder, copper powder, colloidal graphite and rare earth raw materials according to the required ratio of the chemical composition of the bonding phase metal It is prepared, loaded into steel ball mill, adding absolute ethanol as medium and PVA, after ball milling, drying the slurry, pressing and sintering to obtain steel-bonded alloy. The invention combines the in-situ reaction synthesis technology with the liquid phase sintering technology to prepare the TiC high-boron low-alloy high-speed steel-based steel-bonded hard alloy. TiC is synthesized in situ inside the matrix through the reaction in the sintering process, the reinforced particle size is fine, the matrix interface is well bonded and the interface is clean. The preparation process is simple and convenient, and the comprehensive mechanical properties of the alloy are improved.

Description

Technical field [0001] The invention relates to a preparation method of TiC high-boron low-alloy high-speed steel-based steel-bonded cemented carbide, in particular to a preparation method of TiC high-boron low-alloy high-speed steel-based steel-bonded cemented carbide by a reaction sintering method. technical background [0002] Steel-bonded cemented carbide (hereinafter referred to as steel-bonded gold) is based on steel, tungsten carbide, titanium carbide, etc. as the hard phase. It is produced by powder metallurgy, which is between cemented carbide and alloy tool steel, die steel and high-speed steel. Between high-life mold materials and engineering materials. The range of the ratio of the bonding phase and the hard phase of the steel-bonded steel matrix is ​​quite wide, which determines that it has the following excellent properties: 1) A wide range of process properties, mainly forgeability, machinability and heat treatment And weldability. 2) Good physical and mechanical...

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Problems solved by technology

[0006] But the in-situ synthesis method also has many deficiencies: the reinforcing particles are limited to the thermodynamically stable particles in a specific matrix; The shape is controlled by the kinetics of the nucleation and growth process, and after the in-situ particles are formed, they often segregate in the dendrite gap or grain boundary during the casting process, which has a negative impact on the structure and properties of the material, and the processability is poor. The cost is higher than the existing technology, not suitable for large-scale production