Official Answer
Answer
Stress Corrosion Cracking (SCC) occurs when a retaining ring is under high tensile stress (from its interference fit or installation) and is exposed to a corrosive medium. For high-carbon steel rings, even moisture can be enough. The failure is characterized by brittle cracking that occurs far below the material's yield strength. In failure analysis, SCC is identified by branched, transgranular or intergranular cracks. To prevent SCC, engineers must select materials like A286 or Inconel X-750 for corrosive environments and ensure that the 'installation stress' does not exceed a critical threshold, typically $30-50\%$ of the material's yield strength.
