Hot metal is formed into the required shape by the application of pressure or impact forces causing plastic deformation using a press or hammer in a single or a series of dies (Figure 4.1(a)).
Figure 4.1(a) Forging.
• Mainly carbon; low alloy and stainless steels; aluminium; copper; and magnesium alloys. Titanium alloys, nickel alloys, high alloy steels and refractory metals can also be forged.
• Forgeability of materials important; must be ductile at forging temperature. Relative forgeability is as follows, with easiest to forge first: aluminium alloys, magnesium alloys, copper ...