Topic: Material Science
The main objective of 'shot peening' is to improve which property of metal parts
- A. Surface finish
- B. Ductility
- C. Fatigue strength
- D. None of the above
Answer: C. Fatigue strength
Explanation: Shot peening is a mechanical cold working process where the surface of a metal part is impacted with small spherical media (shots). This process induces compressive residual stresses on the material's surface, which significantly improves its fatigue strength by delaying the initiation and propagation of surface cracks.