What is the difference between hot working and cold working?
When a material is deformed plastically, it tends to become harder but the rate of work hardening decreases as the temperature is increased. When a material is deformed plastically at an elevated temperature, two opposing effects take place at the same time – a hardening effect due to plastic deformation and a softening effect due to recrytallization. For a given rate of working, there must be some temperature at which these two effects will just balance. If the material is worked above this temperature, it is known as hot working below this temperature it is known as cold working.
