What Is Annealing?

Annealing is a not just a simple process with just one effect and a single result

. It is a complex technique that can be carried out in many different ways and at different steps in the manufacturing process to obtain different effects on the metals or components in question. It is a complex and delicate process that involves heating steel to a precise temperature and keeping at this temperature for a stipulated amount of time before cooling it again at a precise rate to achieve more favourable cold working properties and greater softness and machinability.

There are many different techniques of this process and when a heated component is brought back to room temperature through cooling inside a furnace it is called a full anneal heat treatment. On the other hand removing the heated component from the furnace after the stipulated period of heating and then allowing it to cool down in open air is called a normalising heat treatment.

Annealing takes the metals to a temperature that is above their re-crystallisation temperature. The actual process occurs on a sub molecular level with the actual diffusion of atoms through solid materials in a manner that brings the metal closer towards what is called its equilibrium state. The heating process provide the energy needed for the atoms to break their bonds and hence eventually allow metals to be more amenable to deformation or ductile in nature.

There are three stages of this process with the first one being the phase in which softening of the metal occurs through the removal of crystal defects and dislocations and internal stresses. This phase covers the entire process before new grains are formed that are free from pre-annealment process stress. The second phase is the one in which new grains are formed to replace the ones that were deformed by stress. The third phase is when the process is allowed to carry on once the formation of new crystals has been completed and a new phenomena called grain growth occurs that may cause the annealed alloy or metal to have unwanted mechanical and strength characteristics.

by: James

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