A full anneal typically results in the second most ductile state a metal can assume for metal alloy.
It creates a new uniform microstructure with good dynamic properties.
To perform a full anneal on steel for example, steel is heated to 50°C above the austenic temperature and held for sufficient time to allow the material to fully form austenite or austenite-cementite grain structure.
The material is then allowed to cool slowly so that the equilibrium microstructure is obtained.
In some cases this means the material is allowed to air cool.
In other cases the material is allowed to furnace cool.
The details of the process depend on the type of metal and the precise alloy involved.
In any case the result is a more ductile material but a lower yield strength and a lower tensile strength.
This process is also called LP annealing for lamellar pearlite in the steel industry as opposed to a process anneal, which does not specify a microstructure and only has the goal of softening the material.
Often the material to be machined is annealed, and then subject to further heat treatment to achieve the final desired properties.
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