Cold Working

The plastic deformation of a metal at a temperature below that at which it re-crystallizes. Increasing the amount of cold work causes the dislocation density to rise in the material, making it more difficult to plastically deform the material and eventually cause brittle fracture.

There are five methods:

  1. Cold rolling
  2. Cold drawing
  3. Cold drawing and grinding
  4. Turning and polishing
  5. Turning and grinding

Recovery

The relief of some of the internal strain energy of a previously cold-worked metal, usually by heat treatment.

Recrystallization

The formation of a new set of strain-free grains within a previously cold-worked material; normally an annealing heat treatment is necessary.

Recrystallization Temperature

For a particular alloy, the minimum temperature at which complete recrystallization will occur within approximately one hour.

See also: Age Hardening, Ageing, Cold Drawing, Cold Rolling, Flow Lines, Peening.

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Subjects: Mechanical Engineering