Preparation method for high-chromium high-nickel high-molybdenum alloy cast iron base VC steel-bonded hard alloy

Abstract

The invention relates to a preparation method for high-chromium high-nickel high-molybdenum alloy cast iron base VC steel-bonded hard alloy. The preparation method is characterized by comprising the steps that V205 powder (vanadium) and graphite powder are prepared into in-situ synthesis VC mixed powder at the atomic ratio that C / V205 is 0.4-0.5; and chromium iron powder, molybdenum iron powder, vanadium iron powder, nickel powder, iron powder, colloidal graphite and rare earth raw materials are prepared according to the ratio required by the bonding phase metal chemical component mass ratio and are loaded into a steel ball mill, absolute ethyl alcohol is added as a medium and PVA, after ball milling, slurry is dried and then subjected to pressing forming, and the steel-bonded hard alloy is obtained through sintering. According to the preparation method for the high-chromium high-nickel high-molybdenum alloy cast iron base VC steel-bonded hard alloy, the high-chromium high-nickel high-molybdenum alloy cast iron base VC steel-bonded hard alloy is prepared by combining the in-situ reaction synthesis technology with the liquid phase sintering technology; the VC is subjected to in-situ synthesis inside a substrate through reaction in the sintering process, so that reinforced particles are small in size, the surface is free of sharp corners, substrate interface bonding is good, and an interface is clean; the preparation method for the steel-bonded hard alloy can improve the comprehensive mechanical properties of the alloy; and in addition, the cost is low, and the process is simple.

Description

[0001] field of invention [0002] The invention relates to a preparation method of a high-chromium-nickel-molybdenum alloy cast iron-based VC steel-bonded hard alloy, in particular to the technical field of preparing a high-chromium-nickel-molybdenum alloy cast iron-based 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 propert...

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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.