What is the use of cryogenic treatment Removal of aluminum sheet stress principle?
However, existing relevant studies indicate that cryogenic treatment can eliminate residual stress gradient generated by the heat treatment temperature, but can not effectively eliminate the residual stress non-uniform plastic deformation machining, cold forming, etc. generated by the welding residual stress elimination of the effect is not good.
Since there is no limit on the cryogenic treatment size and shape of parts, and therefore suitable for complex shape forgings and castings. Before cutting cryogenic treatment can also significantly improve the severely deformed tendency when processing aluminum alloy is easy to produce and improve organizational stability of the material.
The study showed that in selecting the appropriate process parameters, cryogenic heat emergency method can reduce 20-84% of the residual stress. The biggest advantage of cryogenic treatment is effective in the elimination of residual stress at the same time, to improve (at least not decrease) the strength, hardness, wear resistance and organizational stability.
Wherein the cryogenic method is rapid thermal residual stress containing parts immersed in -196 ℃ liquid nitrogen cryogenic, inside and outside temperature uniformity then be rapidly with hot steam jet, thermal stress generated in the opposite direction by rapid heating and quenching, by this offset the original residual stress field.
Cryogenic treatment method, also known as cold stabilization treatment, according to the process can be divided into two types of acute thermal and cryogenic thermal cycling method.
