In the forging process:
1. The metal structure is refine(d)
2. Original unidirectional fibers are distorted
3. Poor reliability, as flaws are always there due to intense working.
4. Part is shaped by plastic deformation of material.
(a) 1, 2 and 3 (b) 1, 3 and 4
(c) 1, 2 and 4 (d) 2, 3 and 4