Cryogenic Treatment Machine Metal Processing Line Cryogenic Tunnel Freezer
Definition: Ultra deep cold refers to materials that need to be processed in an environment of -190°C to -230°C.
Applicable materials: All metallic or non-metallic materials, such as alloys, carbides, plastics (nylon and Teflon), aluminum, ceramics, etc.
Ultra-cryogenic technology: When the metal is hardened by heat treatment to the cooling process, the alloy and carbon therein are dissolved and combined and diffused to form austenite (Austenite). During the cooling process, martensite is formed due to low temperature compression. Martensite), and because the final transformation point (Mf) of martensite is very low. The hardness, wear resistance and service life of metals, and the high brittleness of austenite can easily cause metal fragmentation. Furthermore, there are many physical properties, especially thermal properties and magnetic properties, which are reduced.
Because austenite is very unstable and decomposes in a low temperature environment, the original defects (micropores and internal stress concentration parts) will produce plastic flow and become a refined structure. Therefore, as long as the metal is placed in an ultra-low temperature environment, The austenite will be transformed into martensite, and the internal stress will be eliminated.
At the ultra-low temperature, due to the shrinkage of the structure volume and the reduction of the Fe lattice constant to strengthen the driving force for the precipitation of carbon atoms, a large number of ultra-fine carbides are precipitated in the matrix of martensite. These ultra-fine crystals will increase the strength of the material and increase the resistance. Abrasiveness and rigidity.
Ultra-low temperature can transfer the energy of metal atoms, so that the atoms cannot be diffused and separated so that the atoms are more closely bound.
Inner cavity dimension
Why take cryogenic treatment of the workpiece?
* To improve the hardness and strength of workpiece
* To improve the abrasion resistance of workpiece
* To improve the impact toughness
* To improve the fatigue strength
* To improve the corrosion resistance of workpiece
* To improve the internal stress distribution of workpiece
* To ensure the dimension accuracy of workpiece