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There are Several Kinds of Annealing Process of Wrought Aluminum Alloy

Annealing treatment is a kind of heat treatment process for the purpose of obtaining uniform, stable and fine processing performance of the components. According to the purpose and requirements of different, annealing can be divided into uniform annealing, recrystallization annealing, intermediate annealing and annealing.
 
(1) The uniform annealing is mainly in the aluminum alloy smelting plant. If the cooling rate is too fast, the quenching effect can be produced. In order to prevent the formation of the quenching effect, after annealing, should be cooled with the furnace, or post stack in the air cooling.
 
(2) Recrystallization annealing can eliminate all kinds of plastic deformation caused by the crystal defects and processing hardening, improve product plasticity and toughness. Metal recrystallization is a process of nucleation and nucleation.
 
(3) Intermediate annealing in cold deformation process, when the deformation amount is large, a cold deformation are often difficult to achieve the requirements of the size of the industry shapes and need to by annealing to eliminate work hardening, recovery of plastic, and then to keep the machining deformation.
 
(4) The finished product is annealed in accordance with the characteristics and requirements of the alloy, and the finished product can be divided into two types: incomplete annealing (low temperature) and complete annealing (high temperature). Annealing is the cold plastic deformation caused by cold work hardening, or partially hardened alloy, above the temperature of the heated to transformation, heat preservation, the alloy into single-phase solid solution, and then slowly cooled (usually with the furnace cooling), to ensure that the solid solution decomposition and second phase particles aggregation diffusion process can be carried out.
 
Incomplete annealing is the alloy is heated to a phase transition below the critical point of a proper temperature, and rapid cooling (usually empty cold), eliminating cold work hardening effect, for subsequent deformation smaller forming process, or in improving plasticity, and also to retain part of the cold deformation of enhancing effect (semi cold work hardening).

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