Causes Of Stress Corrosion Racking Of Stainless Steel Coils

Analysis of the causes of stress corrosion cracking of stainless steel coils? A general term that refers to the mutual failure of stressed alloys due to the expansion of streaks in a corrosive environment. Stress corrosion cracking has a brittle fracture morphology, but it may also occur in materials with high toughness.

The necessary condition for stress corrosion cracking is the existence of tensile stress (whether it is residual stress or applied stress, or both) and a specific corrosive medium. The formation and expansion of the pattern is roughly perpendicular to the direction of tensile stress. This stress value that causes stress corrosion cracking is much smaller than the stress value required for material fracture without the presence of corrosive media.

At the microscopic level, cracks passing through the grain are called transgranular cracks, and cracks extending along the grain boundary are called intergranular cracks. When the stress corrosion cracking extends to a certain depth (here, the cross-section of the material under load When the stress reaches its breaking stress in the air), the material will be broken according to normal cracks (in ductile materials, usually through the aggregation of microscopic defects).

Therefore, the section of the part that fails due to stress corrosion cracking will contain the characteristic area of stress corrosion cracking and the "dimple" area associated with the aggregation of micro-defects.