Case 279 ยท Public preview
A Normal Steel Microstructure Does Not Exclude Hydrogen Embrittlement
Zinc-plated spring clips fractured while sustaining a static retaining load.
FractographySEMEDSFailed-to-stock comparisonMetallographic cross-sectioning
What the evidence preview establishes
The clips most likely failed by hydrogen embrittlement associated with hydrogen exposure during zinc stripping or replating. Residual chloride contamination was a separate corrosion risk.
Why this case matters
When a high-strength plated-steel part breaks under a sustained static load, examine the fracture morphology and plating history even if the bulk microstructure looks normal. Control acid exposure, post-plate baking, and cleaning residues.
Full evidence reserved for MEMBER and STOREThe complete case includes the evidence sequence, four interpreted figures, alternative explanations, limitations, and practical application guidance.