Application of Liquid Nitrogen in Deep Cryogenic Treatment of Materials

Precision gages and some precision devices require their organization to be stable and not deformed during use and storage. Some of these precision gauges and devices made of steel have retained austenite after quenching. If the retained austenite is not eliminated, it is difficult for these gauges and devices to ensure no deformation. An effective method of eliminating this retained austenite is to cold treat it, transform the retained austenite into martensite, and temper it to a stable tempered structure. Some aluminum alloy parts have the problem of being easily deformed during cutting, long storage, and use. If the deformation problem is not solved, the scrap rate of the manufacturing process is likely to be high or the quality of the product sold is not good. These deformation problems are often related to residual internal stresses generated by raw materials or machining. To solve these deformation problems, it is sometimes necessary to adopt a high-temperature cycle heat treatment method to eliminate residual stress, which includes cold treatment or cryogenic treatment at a low temperature of -130 ° C or lower. In order to eliminate the residual stress after quenching of aluminum alloy parts, it is sometimes necessary to carry out anti-quenching, that is, to quench the workpiece after quenching, and then use a faster heating rate to increase the temperature of the workpiece to produce the opposite heat to quenching. stress.


There are also special-purpose materials or products that require cold or cryogenic treatment in order to meet dimensional stability and safety requirements for use in low temperature environments. Since the temperature of the liquid nitrogen is -196 ° C and the chemical stability is also good, it can be directly or indirectly used for the above cold treatment. Some of the shapes are relatively simple, and there is no need to worry about deep cold cracking, aluminum alloy parts or steel parts that do not have to worry about changes in mechanical properties, and can be directly immersed in liquid nitrogen for cryogenic treatment. When it is not possible to directly soak, a volatile gas of liquid nitrogen can be used as a cooling medium. Liquid nitrogen can also be used as a refrigerant to cool the container (low temperature chamber) where the workpiece is placed to the desired cold processing temperature.

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