What is Work hardening?
The '''work hardening''', also known as '''strain hardening''', is the strengthening of a metal or [[polymer]] by plastic deformation. The plastic deformation of the metals is made below the [[Recrystallisation|recrystallization]] temperature. In most cases, such cold forming is done at [[room temperature]]. The major cold-working operations can be classified basically as squeezing (rolling), bending, shearing and drawing.<ref>{{Cite web|title=A Short Overview Of Metal Cold Working Processes|url=https://elemetmfg.com/prototyping-with-cold-manufacturing-process/|url-status=live|access-date=2021-11-05|website=elemetmfg.com|date=7 April 2021 |language=en-US|archive-date=2021-11-05|archive-url=https://web.archive.org/web/20211105052459/https://elemetmfg.com/prototyping-with-cold-manufacturing-process/}}</ref> The cold-working process uses the pressure and speed of a mechanical or hydraulic press. The press takes a metal ‘blank’ and shapes it using a ‘punch’ and ‘die’ set. Basically, the punch is the tool used for shaping, and the ‘die’ is the clamp that holds the metal. When these metals are cold worked, permanent defects change their crystalline makeup. These defects reduce the ability of crystals to move within the metal structure and the metal becomes more resistant to further deformation. The resulting metal product has improved [[tensile strength]] and [[hardness]], but less [[ductility]].<ref>{{Cite web|last=Kumar|first=Amrit|date=2021-03-04|title=Cold Working: Definition, Methods, Working Process, Advantages, Disadvantages, Application [Notes & PDF]|url=https://themechanicalengineering.com/cold-working/|access-date=2021-11-05|website=THEMECHANICALENGINEERING.COM|language=en-US|archive-date=2021-11-05|archive-url=https://web.archive.org/web/20211105052459/https://themechanicalengineering.com/cold-working/|url-status=live}}</ref> Cold working can be used on a variety of metals, including [[Aluminium|aluminum]], [[copper]], [[brass]], [[steel]], and [[stainless steel]]. == References == <references />{{sci-stu