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Knowledge of powder metallurgy (PM) process and sintering (5)

Categories: ZCMIM NewsStars: 3StarsVisit: -Release time: 2019-09-04 08:31:00
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4.2.5 Powder pressed steel bonded carbide and high-speed steel

(1) Steel bonded carbide

Steel-bonded carbide is a new kind of mould material which appeared in the 1950s.It has following main characteristics:

The basic composition of alloy is carbide plus alloy steel. In terms of structure, carbides are cemented by steel or metal matrix composites with a large amount of carbides distributed on steel matrix.

Because the composition of steel occupies a certain proportion in the microstructure, so steel cemented carbide has a certain degree technical properties of forging, welding, heat treatment and mechanical processing and other. In particular, different heat treatment can make alloy with same composition exhibit different mechanical properties in a certain range.

not only maintain basic characteristics of alloy steel and carbide, but also has different degree development in mechanical properties

(2) Powder pressed high speed steel

High - speed steel is a tool steel with large consumption. High carbon content of high speed steel, especially alloy element content, belongs to laiitic steel.

A large number of bone-like carbides appeared in cast microstructure, its distribution is extremely uneven and large. Even after hot rolling or forging, segregation and unevenness of carbides are still serious. This has a bad effect on the performance and technology of high speed steel , such as poor thermal deformation, large heat treatment deformation, strong quenching cracking sensitivity, poor grinding performance, low bending strength and easy to flake and collapse, which affects quality and service life of tool.

There are two main high speed steel powders produced at home and abroad: W6Mo5Cr4V2 and W18Cr4V.

4.2.6 Heat resistant material and other materials

(1) Refractory heat resistant material

Refractory metals are metals whose melting point exceeds 2 000 oC and which are often reduced or obtained from other metallurgical processes.

(2) Heat resistant composite materials

Due to difficulty of machining and high consumption, powder metallurgy is often used in manufacture co, ni, fe and other heat resistant alloy materials. The microstructure of heat resistant alloy obtained by powder metallurgy is fine, especially creep strength and tensile strength at high temperature are much higher than those of casting materials.

(3) Other materials

Materials used in special conditions or in nuclear energy industry can also be obtained through powder metallurgy.

4.3 Structural characteristics of powder pressed products 

Structural characteristics refer to whether product structure is suitable for forming process or manufacturing method to achieve high quality, high yield, low consumption in whole production process. 

By powder pressing metallurgy, designer must understand powder pressing process characteristics, fully consider and evaluate technical and economic possibilities and limitations of product’s dimension and geometric shape. Sometimes, original conventional machinery parts although can be made by powder pressing method, but if in view of powder pressing process characteristics to make slight modification on product design, it may improve product structural characteristics and reduce production cost. Compared with casting or forging, powder pressing method has some limitations on product structure.

Keywords in the article: powder metallurgy (PM)
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