Manufacturing method of diffused alloy steel powder

Abstract

A process for preparing diffusion-type alloy steel powder uses water-atomized pure iron powder and powdered alloy elements as raw materials, and includes mixing and diffusion steps. It can be used for high-density and high-strength powder metallurgy with the advantages of low cost and excellent performance.

Description

Technical field: [0001] The invention belongs to the field of powder metallurgy, in particular to a method for manufacturing alloy steel powder. Background technique: [0002] Water atomization diffused alloy steel powder is mainly used to produce powder metallurgy with high density, high strength, high wear resistance, strong corrosion resistance and complex shape, such as car engine intake valve seat, power steering pump rotor, gearbox synchronizer hub, etc. Structural parts, the development of water atomization and diffusion alloy steel powder is of great significance to the development of powder metallurgy industry and car industry. Water atomized diffusion type alloy steel powder is generally based on water atomized high-performance pure iron powder, mechanically mixed with alloy element powder or fine pre-alloyed (such as Ni, Mo, Cu, etc.) powder, and then passed through a specific Diffusion treatment process, the fine powder of alloying elements is diffused and bonde...

AI Technical Summary

Problems solved by technology

The disadvantages of this process are that the alloying elements cannot be mixed evenly, so that the subsequent diffusion process cannot be carried out smoothly, which affects the uniformity of diffusion alloying and the consistency of the degree of diffusion, thereby affecting the compressibility of the final powder and the dimensional stability of sintered parts. ; Second, due to the low specific gravity and fine particle size of the alloy element powder, the fine powder is flying during the mixing process, and the working environment is harsh, which is also easy to cause the loss of the alloy powder

In order to solve the above problems, the Swedish Högnas company chose not to use pure iron powder as the matrix, but to use a pre-alloyed powder as the production process of the diffusion matrix, which adds most of the alloying elements during the smelting process and completely alloys Only a small amount of alloying element powder is diffused, which solves the above problems to a certain extent, but increases the production cost; at the same time, due to the alloy strengthening effect of the alloying elements in this company's process, the hardness of the powder increases. The compression performance is reduced, which also brings inconvenience to the subsequent processing