We were asked to investigate defects on the blades of a 304 Stainless Steel mixer. The defects were found to be a uniformly sized foreign metallic contaminant averaging 0.028 inches deep, containing approximately 3% nickel and 6% chromium. Metallurgical bonding at the defect-to-base metal interface indicates the defects became incorporated into the plate during thermo-mechanical processing such as slab and/or plate hot rolling. What you see here is a 25x magnification of the defect depth and microstructure.
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