From the macro point of view, cryogenic treatment has the following functions: cryogenic box, liquid nitrogen cryogenic box, ultra-cryogenic box, cryogenic equipment, cryogenic furnace, cryogenic treatment equipment, cryogenic assembly box, cryogenic assembly equipment, high and low temperature environment box.
Improving Wear Resistance of Materials
Improving dimensional stability of materials
Improve the strength, plasticity, toughness, fatigue and other comprehensive properties of materials
Improving Physicochemical Properties of Materials such as Electrical Conductivity, Thermal Conductivity and Corrosion Resistance
Cryogenic treatment involves a variety of materials, including iron and steel materials, non-ferrous metals and some non-metallic materials (such as plastics, nylon, etc.). For different materials, the mechanism of cryogenic treatment is different
For iron and steel materials:
Firstly, the transformation of retained austenite to martensite occurs during cryogenic treatment, which improves the hardness, strength and dimensional stability of the workpiece.
Secondly, the lattice constant of iron tends to decrease due to the shrinkage of martensite matrix volume during cryogenic treatment, which increases the driving force of carbon atom precipitation.
On the other hand, retained austenite transforms into martensite at low temperature, and the internal stress of the material increases, which promotes the precipitation of carbides. In the subsequent tempering process, a large number of dispersed ultrafine carbides were precipitated on the martensite matrix, which resulted in material strengthening and greatly improved the wear resistance of the material.
In addition, cryogenic treatment can refine the structure and cause the strengthening and toughening of the workpiece. At the same time, it can cause the internal defects (micro-holes, internal stress concentration) of the material to occur plastic rheology, resulting in residual compressive stress on the surface of the material. Cryogenic treatment can partly transfer the kinetic energy of the atoms, make the bonding between atoms closer, and improve the performance of the material.