Advantages of Mechanical Working Process Over Other Manufacturing Processes

• They have higher productivity compared to other manufacturing processes.
• Forged products have higher strength, better corrosion, and wear resistance as compared to the casting and machined processes.
• There is minimum wastage of materials.
• The forged products have high dimensional accuracy and surface finish.
• Some special products like thin foil, wire, sheet steel, and other products can be manufactured by only mechanical working.

Recrystallization Temperature

According to ASME (American Society of Mechanical Engineers), the recrystallization temperature is defined as ‘the approximate minimum temperature at which the complete recrystallization of cold worked metal occurs within a specified period of time.’ Recrystallization reduces the strength and increases the ductility of the metal.

Factors which Affect the Recrystallization Temperature

• Grain size: Smaller grain size decreases recrystallization temperature.
• Function of time: Recrystallization temperature depends on the function of time of heating.
• Type of metal: For pure metal, it is lower in comparison to alloys.
• Extent of prior cold work: Higher the prior cold work, lower will be recrystallization temperature.
• Rate of deformation: Increasing the rate of deformation decreases the recrystallization temperature.For pure metal, critical temperature T_cr = 0.3T_m.For alloys, T_cr = 0.5T_m, where T_m is a melting temperature.