Water atomization diffusion alloy powder and preparation method thereof

Abstract

The invention belongs to the field of powder metallurgy, and more particularly relates to a preparation method of water atomization diffusion alloy powder, which is characterized in that ferro-molybdenum is firstly added in the smelting process, and water atomization pre-alloyed powder can be prepared; and nickel powder and copper powder are mixed into the water atomization pre-alloyed powder for diffusion treatment. The preparation method has the operation steps of: 1) adding the ferro-molybdenum after smelting; 2) carrying out water atomization; 3) reducing; and 4) adding nickel powder and copper powder and diffusing by a reduction furnace. The prepared water atomization diffusion alloy powder comprises the chemical composition by weight percent: 0.001-0.2% of C, 0-0.5% of Si, 0-0.5% of Mn, 0-0.05% of P, 0-0.050% of S, 0.1-5.0% of Ni, 0.1-3% of Mo, 0.1-5.0% of Cu and the balance of Fe. The invention has the beneficial effects that alloying elements can be further completely alloyed in the diffusion process; and composition segregation of the alloying elements can not be caused in the processes of transportation and mixing treatment.

Description

Technical field [0001] The invention belongs to the field of powder metallurgy, and in particular relates to a pre-alloyed + diffusion alloyed water atomized diffusion alloy powder and a manufacturing method thereof. Background technique [0002] In order to improve the strength, toughness and apparent hardness of powder metallurgy products, the sintering-quenching-tempering production process is generally used. Choosing appropriate alloying elements can effectively improve the hardenability of the material, so that the product undergoes a martensitic transformation during a series of heat treatments, and at the same time has a certain toughness. Water atomized alloy powder can effectively improve powder metallurgy products Comprehensive mechanical properties, especially on impact-resistant products such as electric tools and refrigerator crankshafts, have good comprehensive performance, and can ensure the dimensional tolerance of powder metallurgy products. [0003] At present, i...

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Problems solved by technology

[0003] At present, in order to improve the comprehensive properties of powder metallurgy products such as hardenability, strength, and toughness, Mo, Ni, and Cu powders are often added to water atomized iron powder. The disadvantage is that the composition of alloying elements will segregate during transportation and mixing. , reduce the yield of sintered products, and the strength and hardness parameters are also low

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