Recrystallization (metallurgy)

Recrystallization describes the metallurgy the reduction of lattice defects in the crystallites through the reformation of the structure on the basis of nucleation and grain growth. Cause for the decrease in strength of the recrystallization is the reduction of dislocations.

The recrystallization takes place in the structure, when a transformation has been applied, which is above the critical deformation degree. If the recrystallization occurs during the deformation, then we speak of dynamic recrystallization, after the completion of the forming is static recrystallization. A precursor of recrystallization (particularly for body-centered cubic metals ) the dynamic or static recovery, which performs reordering of lattice defects to a reduction in strength.

After a cold-forming is often a recrystallization annealing necessary in order to reduce solidification. For this, the material is heated above the recrystallization temperature.

Recrystallization

The temperature is referred to as a recrystallization temperature at which a material, within a consideration period completely recrystallized. It is often estimated as a rule of 40 % or 50 % of the absolute melting temperature. In the steel they may be extended under thermomechanical treatment by micro-alloying elements titanium and niobium, which secrete as fine particles during hot forming. Example: 0.1 % niobium increase the recrystallization temperature to 300 K. Find deformation above the recrystallization takes place, it is called hot stamping, including it is cold forming or to warm forging when the metal is heated, but do not exceed the recrystallization temperature.

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