Glossary

Shot peening is a cold working process that strengthens metal parts by bombarding their surface with small, spherical media such as steel, glass, or ceramic balls. This process introduces a layer of beneficial compressive stress on the metal's surface, which significantly improves its resistance to fatigue and cracking.

The process works by using a controlled stream of media to repeatedly strike the metal part. Each impact creates a small dimple, and the plastic deformation of the outer layer creates a compressive stress as it is constrained by the underlying material. This compressive layer is crucial because cracks typically form in areas of tensile stress. By counteracting these stresses, shot peening increases the part's resistance to stress corrosion cracking and fretting, thereby extending its fatigue life.

Shot peening is a vital process in industries where component durability and reliability are essential, including aerospace, automotive, and heavy manufacturing. It's commonly used on parts like turbine blades, crankshafts, and gears to ensure they can withstand high-stress environments and meet rigorous quality and safety standards.