The application for controlled shot peening for the prevention of stress corrosion cracking (SCC)

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:378083

Daly, J ^[1]

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1. Metal Improvement Co., Paramus, NJ (United States)

Shot peening is a cold working process where spherical media called shot bombards the surface of a part. Each piece of shot acts as a tiny peening hammer imparting to the surface a small dimple. In the process, the surface fibers of the material are yielded in tension. Below the surface, the fibers try to restore the surface to its original shape thereby producing a hemisphere of cold worked material highly stressed in compression. Complete overlapping dimples develop an even layer of residual compressive stress. SCC is a progressive fracture mechanism that is caused by the simultaneous interaction of a corrodent and a sustained tensile stress. The tensile stresses necessary for SCC are static and they may be residual and/or applied. Compressive residual stresses such as those induced by controlled shot peening can be used to prevent or delay SCC. This paper will deal with the theory, applications and controls of the shot peening process.

• OSTI ID: 378083
• Report Number(s): CONF-9606194--; ISBN 1-877914-94-0
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AIRCRAFT
CARBON STEELS
CHEMICAL REACTORS
COMPRESSION STRENGTH
COPPER ALLOYS
CORROSION PROTECTION
CRACK PROPAGATION
FOSSIL-FUEL POWER PLANTS
GAS APPLIANCES
HASTELLOY B
METALS
MITIGATION
NICKEL ALLOYS
NUCLEAR POWER PLANTS
PETROLEUM REFINERIES
PRESSURE VESSELS
RESIDUAL STRESSES
SHOT PEENING
STAINLESS STEEL-304
STAINLESS STEEL-316
STAINLESS STEEL-316L
STRESS CORROSION
TANKS