Preparation method of high-strength-and-toughness heat-resisting VC steel bonded hard alloy

Abstract

The invention relates to a preparation method of a high-strength-and-toughness heat-resisting VC steel bonded hard alloy. The preparation method is characterized in that V205 powder(vanadium) and graphite powder are prepared according to the C / V205 atomic ratio ranging from 0.4 to 0.5 to form in-situ synthesis VC mixed powder; and chromium iron powder, ferro-molybdenum powder, ferrovanadium powder, ferroboron powder, iron powder, nickel powder, copper powder, aquadag and rare earth raw materials are prepared according to the needed proportion of the bonding phase metal chemical component mass ratio, steel balls are added for ball milling, absolute ethyl alcohol is added to serve as a medium and PVA, and slurry is dried to be pressed, formed and sintered after ball milling to obtain the steel bonded hard alloy. According to the preparation method, the in-situ reaction synthetic technique and the liquid phase sintering technique are combined, and the high-strength-and-toughness heat-resisting VC steel bonded hard alloy is prepared. As VC is obtained through in-situ synthesis inside a base in reacting in the sintering process, the reinforced particle size is small, the surface is free of sharp corners, base interface bonding is better, and an interface is clean. By means of the steel bonded alloy preparing method, the comprehensive mechanical property of the alloy can be improved, the price is low, and the process is simple and convenient.

Description

[0001] field of invention [0002] The invention relates to a preparation method of a high-strength, toughness, and heat-resistant VC steel-bonded hard alloy, in particular to the technical field of preparing high-strength, toughness, and heat-resistant VC 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 and mechanical properties, mainly in wear ...

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Problems solved by technology

[0015] 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.