The hardness of cemented carbide is closely related to its crystal structure.
First, the crystalline phase structure of cemented carbide includes carbide phases such as tungsten carbide (WC) and titanium carbide (TiC), as well as metallic cobalt (Co) phase. Among them, tungsten carbide is the most important hard phase, which has the characteristics of high hardness, high melting point and good wear resistance. Titanium carbide is also a common hard phase with high hardness, high melting point, and good wear resistance and corrosion resistance. The metallic cobalt phase is a binder and alloy agent with high density, high strength and good plasticity.
Secondly, the lattice structure of cemented carbide will affect its hardness. Lattice structure refers to the arrangement of atoms or ions in a crystal in three-dimensional space. This arrangement affects the mechanical properties of the crystal. In cemented carbide, by changing the type and content of alloying elements, the lattice structure can be changed, thereby affecting its hardness. For example, the stability and organizational structure of the crystal lattice can be changed by adding other metallic elements, making it more compact and orderly, thereby increasing hardness.
In addition, the existence of grain boundaries will also affect the hardness of cemented carbide. Grain boundaries refer to the interface between crystals, which can hinder the movement of dislocations and thereby increase the hardness of the alloy. In the preparation process of cemented carbide, by controlling process parameters such as heat treatment, the grains can be refined and the number of grain boundaries can be increased, thereby improving the hardness of the alloy.
To sum up, the hardness of cemented carbide is closely related to its crystal phase structure. By changing the type and content of alloy elements and controlling process parameters such as heat treatment, the lattice structure and the number of grain boundaries can be adjusted, thereby changing the hardness of cemented carbide.
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