Cryogenic treatment technology

2021-04-09 10:35:18

Cryogenic treatment technology

      Cryogenic treatment 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, the low temperature produces martensite (Martensite). ), and because the transformation point (Mf) of martensite is very low, for example, the Mf point of W18Cr4V (high-speed tool steel) is more than -190°C, so a large amount of austenite will remain after quenching to room temperature, thereby reducing the metal's Hardness, wear resistance and service life. At the same time, due to the high brittleness of austenite, it is easy to cause metal fragmentation. In addition, there are many physical properties, especially thermal properties and magnetic properties.

      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, the cryogenic treatment equipment only needs to place the metal in an ultra-low temperature environment. Next, the austenite in it will be transformed into martensite, and the internal stress will be eliminated.

      At 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.

      The ultra-low temperature can transfer the energy of the metal atoms, so that the atoms cannot be diffused and separated, so that the atoms are more closely bound.

Nuoruida (Tianjin) science and Technology Co., Ltd. is committed to research, development, and sales of liquid nitrogen freezer. Using European technology, we provide a variety of equipment. The main equipment is liquid nitrogen cryogenic freezer, liquid nitrogen cabinet freezer, liquid nitrogen tunnel freezer,sub-zero processing equipment, cryogenic freezing equipment, and so on.