What is forgeability ?

 The basic lattice structure of metals and their alloys seem to be a good index to their relative forgeability or work - ability. Forgeability increases with temperatures up to a point at which a second phase, e.g., from ferrite to austenite in steel , appears or if grain growth becomes excessive. Certain mechanical properties also influence forgeability. Metals, which have low ductility have reduced forgeability at higher strain rates, whereas highly ductile metals are not so strongly affected by increasing strain rates. The product designer as a wide variety of metals or alloys from which to choose the materials for forged parts. Most forging grades of ferrous or non-ferrous alloys are selected based on their inherent property levels as bar or billet materials, usually after heat treatments are performed. the forging process tends to improve some of the mechanical properties , such as impact toughness, fatigue strength, and tensile ductility, which are dependent on the gain flow patterns  developed during forging. Some alloys are relatively easy to forge and may be used to make components with very intricate features. Grade that are more difficult to forge require distinct design approaches. Forgeability , thus can be defined as "the relative ability of a material to deform without rupture."