Tungsten Carbide Materials Deep Cryogenic Treatment

Conventional heat treatment is an important technology to improve the structure and properties of materials. And deep cryogenic treatment is a kind of new technology that develops and extends on this basis. For common steel materials, deep cryogenic treatment has many advantages, such as:

1. It can make the retained transferred, improve the hardness of the workpiece and keep the dimensions stable;
2. The precipitated ultra-fine carbides can remarkably improve the wear resistance of workpieces;
3. It can effectively refine the grains and improve the impact toughness of the workpiece;
4. It can improve the corrosion resistance of Martensitic stainless steel and the polishing properties and so on.
In addition, with the further development of liquid nitrogen cooling and insulation technology, deep cryogenic treatment has been gradually widely used in tungsten carbide materials fields.

At present, the studies of tungsten carbide material deep cryogenic treatment can be mainly divided into two types: one is contains cooling and holding two stages, which control carbide cooling from room temperature to the processing temperature. In this process, it should be noticed that the controlling of the cooling rate in case of a greater thermal shock. And then hold a day or longer at deep cryogenic treatment temperature; the other one is with tempering treatment and control the temperature rise above ambient temperature and maintained for some time. The experiment shows that the cutting force of tungsten carbide blade has been reduced, the thermal conductivity has been improved, the wear loss of blade was smaller, the surface toughness was higher and the service life has been extended. But in the state of continuous cutting, the effect of deep cryogenic treatment will disappear with the increasing cutting time. This is due to the carbide tool cryogenic treated in a metastable state, the role of the cutting tool after high temperature cryogenic treatment a long time will gradually decrease until it disappears. So in order to extend the effect of deep cryogenic treatment, we can add some cooling medium from outside.

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