hot and cold working of metals pdf

Hot And Cold Working Of Metals Pdf

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ME162 ASSIGNMENT 3 HOT & COLD WORKING

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In this article, you are going to learn about the Hot Working and Cold Working process, its advantages and disadvantages in details. If the metalworking process is carried out above its re-crystallization temperature, it is called as hot working. Re-crystallization temperature is the temperature at which atomic mobility can be repaired when any defect was present in the metal caused by the working process. In this process, the metal is heated to the plastic state, and then the pressure is applied to get various size and shapes. If the pressure is applied by hand hammer, then it is called as hand or smith forging. If hand hammering is replaced by power hammers, then it is called hammer forging.

Plastic deformation which is carried out in a temperature region and over a time interval such that the strain hardening is not relieved is called cold work. Considerable knowledge on the structure of the cold-worked state has been obtained. In the early stages of plastic deformation, slip is essentially on primary glide planes and the dislocations form coplanar arrays. As deformation proceeds, cross slip takes place. The cold-worked structure forms high dislocation density regions that soon develop into networks.

Difference Between Hot Working and Cold Working

By saurabhjain. They both are the metal forming processes. When plastic deformation of metal is carried out at temperature above the recrystallization temperature the process, the process is known as hot working. If this deformation is done below the recrystallization temperature the process is known as cold working. There are many other differences between these processes which are described as below.

Hot Working and Cold Working; Its Advantages, Disadvantages

Total Materia New Application Launch! Cold working is the plastic deformation of metals below the recrystallization temperature. In most cases, such cold forming is done at room temperature. The major cold-working operations can be classified basically as squeezing, bending, shearing and drawing.

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