Laves phase eutectic alloy with high strength, high hardness and high thermal stability and preparation method of laves phase eutectic alloy

Abstract

The invention discloses a Laves phase eutectic alloy with high strength, high hardness and high thermal stability and a preparation method of the Laves phase eutectic alloy. The preparation method comprises the following steps that 1, high-purity metal raw materials are polished and cleaned, and proportioning is conducted according to chemical components Cr-22.93 Fe-53.68 Nb (at.%); and 2, the metal raw materials are sequentially put into a water-cooled copper crucible of a non-consumable electric arc melting furnace according to the sequence that the melting points are from low to high, the vacuum degree of a furnace body is increased to 3 * 10 <-3> Pa to 6 * 10 <-3> Pa, high-purity argon is introduced, the air pressure in the furnace is controlled to be 0.05 Pa, and in an electric arc melting process, an alloy ingot is turned over and remelted five times to obtain an eutectic alloy product. According to the eutectic alloy, in a microscopic structure, a full eutectic Laves phase / Nbss phase is arranged in dendrites, a full eutectic Laves phase / mu phase / Nbss phase is arranged among the dendrites, the eutectic alloy has high strength, high hardness and high thermal stability, meanwhile, low-cost Fe is adopted for replacing Cr, the material cost is low, the manufacturing process is simple, rapid and efficient, the eutectic alloy has the advantages of being small in crystallization temperature interval, good in fluidity, small in component segregation and the like, and is suitable for preparing large-size high-quality components with uniform components and structures.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and relates to a tool steel material and a preparation method thereof, in particular to a Laves phase eutectic alloy material with high strength, high hardness and high thermal stability and a preparation method thereof. Background technique [0002] Among the traditional cutting tool materials, carbon tool steel has the advantages of high hardness, etc., but its thermal stability is poor, and it is only used in the manufacture of tools with low cutting speed. High-speed tool steel has good machinability, high strength, The advantages of high hardness and high wear resistance are widely used in the manufacture of complex cutting tools, but powder metallurgy high-speed steel still has shortcomings such as complex process, unavoidable foreign impurities, and difficulty in preparing large-size and special-shaped products. At the same time, it has very high requirements for sintering tem...

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Problems solved by technology

[0002] Among the traditional cutting tool materials, carbon tool steel has the advantages of high hardness, etc., but its thermal stability is poor, and it is only used in the manufacture of tools with low cutting speed. High-speed tool steel has good machinability, high strength, The advantages of high hardness and high wear resistance are widely used in the manufacture of complex cutting tools, but powder metallurgy high-speed steel still has shortcomings such as complex process, unavoidable foreign impurities, and difficulty in preparing large-size and special-shaped products. At the same time, it has very high requirements for sintering temperature. harsh

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