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Stress Corrosion Cracking
Oct 22, 2018

Stress corrosion cracking (SCC) : a general term used to describe the alternate failure of a stress bearing alloy in a corrosive environment due to the expansion of grains. Stress corrosion cracking has brittle fracture morphology, but it may also occur in ductile materials. The necessary conditions for the occurrence of stress corrosion cracking are the presence of tensile stress (either residual stress or external stress, or both) and a specific corrosion medium. The profile is formed and expanded roughly perpendicular to the direction of tension stress. This stress value, which results in stress corrosion cracking, is much smaller than that required for material fracture in the absence of corrosive media. In the micro level, through the crack in grain called transgranular crack, and the cracks along the grain boundary expansion graph called the intergranular crack, when the stress corrosion cracking extended to one depth (here, the load stress on the section of materials to achieve its fracture stress) in the air, the material is according to the normal crack (in ductile material, usually through microscopic defect aggregation) and disconnect. Therefore, the section of a part that fails due to stress corrosion cracking will contain characteristic areas of stress corrosion cracking and "dimple" areas associated with the polymerization of microdefects.