Determination of carbon content in powder metallurgy based products

       

The determination of carbon content of powder metallurgy base products generally has the following situations.

Generally, the carbon content of carbon steel shall be controlled between 0.5-1.2%, which shall be adjusted appropriately according to the mechanical properties and technical requirements of powder metallurgy products. The carbon content of powder metallurgy products is directly related to the hardness of later products. High carbon content, high hardness, low carbon content and low hardness. The carbon content of powder metallurgy products will also affect the brittleness of products. The higher the carbon content, the greater the brittleness. The carbon content of powder metallurgy also has a certain effect on machining. The higher the carbon content, the harder it is to process.

According to the above points, and then remove the factor of sintering decarburization, the carbon content can be adjusted in powder metallurgy design.

In short, free carbon is relative to the compound, and the carbon that is not easy to combine or easily separated from the compound is the carbon of simple substance. The element exists in the form of simple substance is called free, and free carbon is the carbon element existing in the form of simple substance. The ideal carbon content of tungsten carbide in cemented carbide (WC) is 6.13% by mass. When the carbon content is too high, the product will have obvious carburized structure. The product will eventually have obvious excess free carbon. The free carbon will greatly reduce the strength and wear resistance of tungsten carbide.

As we all know, the strength of cemented carbide usually depends on the bonding dose, carbon content and carbide particle size of the alloy. Too high free carbon will directly affect the hardness, strength and other properties of the alloy.

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