Annealing & Metallurgy: The Different Stages and Processes



Posted: Thursday, May 28, 2009

by Richard Milton
IndustrialSAVER.com

Annealing is a part of metallurgical or materials sciences that is used in order to alter a materia
l. The end result of the alteration evolves on the hardness and strength of the piece. The process is commonly seen to involve steps like heating above temperature then normalizing it. After which, cooling of the material will be necessary. It softens a material or induces ductility while shaping, forming or stamping it to the desired output.

Three stages are linked to the annealing process, namely:

Recovery phase. This is that point when the metal is softened by means of removing defects on the crystals and whatever internal stress the dislocation causes. This stage covers the instance before any stains or grains are seen on the material.

Recrystallization phase. This is the phase when new grains grow on the material. This is said to replace those that were deformed and removed during the recovery phase.

Grain growth phase. This stage results to a problem on the material. Since grains occur, there is a tendency for the output to coarsen thus making the metal less satisfactory than usual.

Annealing process

The annealing process is known by other names. It may often be referred to as intermediate, subcritical or in-process annealing. This is the cycle for heat treatment allowing the material to be more ductile or flexible without having the tendencies of breaking while it is worked at. The processes will involve rolling, drawing, spinning, forging or extruding. The material is heated first then will be set to cool down.

Several other processes may complete annealing. A full or a short cycle may be opted depending on the material being worked on. Materials such as silver, copper, brass and other alloys are also used in the process. The process is considered special because it does not have any complications with decarburization.

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