Powder Metallurgy High Speed Steel

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SIMUWU provides corresponding supporting facilities and process flow for powder metallurgy and MIM process. Powder metallurgy of high-speed steel has become a very popular process in recent years.

High-speed steel is a tool steel with high hardness, high wear resistance and high heat resistance. It can still maintain high hardness at 500 °C, and has a good combination of strength and toughness. It can be used to manufacture complex thin edges and impact-resistant metals. Cutting tools, can also manufacture high temperature bearings and cold extrusion dies. Powder metallurgy high-speed steel is a high-speed steel prepared by powder metallurgy process. The carbides are evenly distributed in the matrix in the form of extremely fine particles, which avoids the reduction of mechanical properties and heat treatment deformation caused by the segregation of carbides produced by the smelting method. increase its service life.

The biggest feature of powder metallurgy high-speed steel is that various alloying elements can be uniformly distributed in the steel, which solves the problem of segregation of alloying elements in the steel inherent in the original ingot casting method. Segregation causes product inconsistency and affects the performance of the material. In addition, the powder metallurgy method can greatly increase the content of alloying elements in the steel, which cannot be achieved in the traditional ingot steelmaking process.

The powder metallurgy process is divided into four parts: powder preparation, compression molding, sintering and post-processing:

(1) Preparation of powder. The production process of powder includes steps such as powder preparation and powder mixing. In order to improve the formability and plasticity of the powder, plasticizers such as motor oil, rubber or paraffin are usually added.

(2) Press molding. The powder is pressed into the desired shape under the pressure of 15-600MPa.

(3) Sintering. It is carried out in a high temperature furnace or a vacuum furnace in a protective atmosphere. Sintering differs from metal melting in that at least one element remains in the solid state during sintering. During the sintering process, the powder particles become metallurgical products with a certain porosity through a series of physical and chemical processes such as diffusion, recrystallization, fusion welding, compounding, and dissolution.

(4) Post-processing. In general, the sintered parts can be used directly. However, for some parts that require high precision and high hardness and wear resistance, post-sintering treatment is required. Post-processing includes precision pressing, rolling, extrusion, quenching, surface quenching, oil immersion, and infiltration.

The RVS series dewaxing vacuum sintering furnace produced by SIMUWU is an excellent equipment for processing powder metallurgy. It has the advantages of good vacuum degree, high temperature uniformity and convenient operation, and is widely praised by major manufacturers.