Stress Accelerated Grain Boundary Oxidation (SAGBO) in Nickel Alloys

Modern nickel-iron superalloys have enabled certain high pressure components, such as gas turbine blades, turbine studs, springs, and nozzles to operate at higher temperatures. Many of these superalloys have been found to suffer from a unique damage mechanism called stress accelerated grain boundary oxidation (SAGBO) cracking. SAGBO is a subclass of stress corrosion cracking that is caused by the synergistic effect of tensile stress (either residual or applied), temperature, and the presence of oxygen. SAGBO occurs when oxygen diffuses along the grain boundaries and through either embrittlement or oxide wedging, the grain boundaries separate.

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