Metal forming is a very common practice in the metallurgy industry that lots of kinds of products are produced. Metal forming processes are generally classified according to the application temperature. In terms of that, there are metal forming applications called cold working and warm working. The other type of metalworking process is hot working, also referred to as hot forming.
Here the hot metalworking process is explained with the general aspects, advantages, disadvantages, and important process parameters.
As we stated above, the application temperature is the most important parameter of metalworking processes. And the classification of metalworking processes is generally made according to the melting temperature. If the metalworking processes are applied above one-half of the melting temperature of the metal, the process is called hot metalworking.
In practice, hot metalworking processes are made around 0.5*Tm-0.7*Tm. But there can be serious problems in terms of the high temperatures. In the deformation process, heat is also produced because of the deformation itself. And because of this additional heat, the deformation regions can melt, which is not a desirable thing. When the metalworking temperature must be decided, this fact must be considered.
The most important process characteristic of the hot metalworking process is recrystallization. With the recrystallization of metal parts at high temperatures, deformability increases due to compensation of the work hardening. In some hot metalworking processes, recrystallization is not intended and the process cycle is too rapid for the diffusion of the metal grains for recrystallization. But, complete or partial recrystallization is obtained in the cooling period, after the process.
In the selection of the required process for metal forming, these disadvantages of the hot metalworking processes must be considered.
These are the general aspects of hot metalworking processes.
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