What is Deformation Processing?

– Definition

Deformation processing is under the action of external force, make the metal/ alloy raw to deform in a predetermined manner, to form it with geometric shape and size accordingly. It can be proceeded at heated or room temperature.

Based on the processing temperature is below or above crystallization temperature of the raw material to distinguish cold deformation or hot deformation. Below of the crystallization temperature is cold deformation processing, and above of the crystallization temperature is hot deformation processing.

– Cold Deformation Processing

There is no recovery and recrystallization of metal during cold deformation processing, and the change of its structure and properties is unidirectional, and it will be produced cold-deformed fibrous tissue and work hardening phenomenon.

Since there is no oxide layer on the surface of products after cold deformation processing, it will be achieved higher tolerance class, smaller surface roughness value, and higher strength and hardness in no time. And cold deformation processing is more suitable for small section size, machining precision and surface quality requirements of metal products.

– Hot Deformation Processing

During hot deformation processing, metal materials in the recrystallization temperature above, as the plastic deformation lead to work hardening, for another since the recovery and recrystallization lead to elimination of work hardening, makes the change of organization and performance is bidirectional, so the hot deformation processing will not have work hardening phenomenon.

Since it is very easy to be oxidized of the product surface during hot deformation processing, the surface effect and size tolerance are not as good as the cold deformation processed products. Therefore, hot deformation processing is mainly used for large section size, large deformation of metal products or semi-finished products, as well as the deformation of metal materials with greater brittleness.