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Mechanical function of cemented carbide

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As an industrial tooth, cemented carbide is a multiphase material prepared by powder metallurgy technology with carbides (WC, tic, etc.) of one or more refractory metals as hard phase and transition metals (CO, etc.) as bonding phase. As the purpose of cutting cemented carbide tools, the commonly used carbides are WC, tic, TAC, NBC, etc., and the commonly used bonding phases are co, Ni, Fe, etc. The strength of cemented carbide mainly depends on the content of bonding phase. Cemented carbide has the advantages of high strength, high hardness, wear resistance, corrosion resistance, high temperature resistance and small linear expansion coefficient. It is widely used in many industrial production and processing operations. It is one of the better tool materials.

According to the analysis of relevant physical parameters, the mechanical properties of cemented carbide are mainly shown in the following aspects:

1. Bending strength

The bending strength of cemented carbide is lower than that of high-speed steel. Even YG8 cemented carbide with high bending strength has only about half of that of high-speed steel. The higher the cobalt content in cemented carbide, the higher its strength. With the same cobalt content, the bending strength of WC tic Co alloy decreases with the increase of TiC content. In addition to the types of carbides, the size of WC grains also affects the strength of cemented carbide. The bending strength of coarse grain cemented carbide is higher than that of medium grain cemented carbide.

2. Compressive strength

The compressive strength of cemented carbide is very high, which can be 30% - 50% higher than that of high-speed steel, about 3500-5600mpa, and the hot isostatic pressing product can reach 6000mpa The compressive strength of cemented carbide is related to the content of cobalt, and the compressive strength is greater when the content of cobalt is 5%. The compressive strength of fine grain cemented carbide is greater than that of coarse grain cemented carbide. The compressive strength of YT cemented carbide is lower than YG cemented carbide, and decreases with the increase of TiC content. Adding a small amount of TAC, NBC and VC can refine WC grains and improve the compressive strength.

Because the compressive strength of cemented carbide is much higher than the flexural strength, when designing the tool structure and selecting cemented carbide blade, the tool head should be in the state of compressive stress and less bending moment

According to the analysis of relevant physical parameters, the mechanical properties of cemented carbide are mainly shown in the following aspects:

1. Bending strength

The bending strength of cemented carbide is lower than that of high-speed steel. Even YG8 cemented carbide with high bending strength has only about half of that of high-speed steel. The higher the cobalt content in cemented carbide, the higher its strength. With the same cobalt content, the bending strength of WC tic Co alloy decreases with the increase of TiC content. In addition to the types of carbides, the size of WC grains also affects the strength of cemented carbide. The bending strength of coarse grain cemented carbide is higher than that of medium grain cemented carbide.

2. Compressive strength

The compressive strength of cemented carbide is very high, which can be 30% - 50% higher than that of high-speed steel, about 3500-5600mpa, and the hot isostatic pressing product can reach 6000mpa The compressive strength of cemented carbide is related to the content of cobalt, and the compressive strength is greater when the content of cobalt is 5%. The compressive strength of fine grain cemented carbide is greater than that of coarse grain cemented carbide. The compressive strength of YT cemented carbide is lower than YG cemented carbide, and decreases with the increase of TiC content. Adding a small amount of TAC, NBC and VC can refine WC grains and improve the compressive strength.

Because the compressive strength of cemented carbide is much higher than the flexural strength, when designing the tool structure and selecting cemented carbide blade, the tool head should be in the state of compressive stress and less bending moment.

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