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Failure Analysis

Defects on Blades of a 304 Stainless Steel Mixer

25x magnification of defect depth on mixer
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.

 

See also:

Failure Analysis of a Seized Piston on a Monel Series 3800 Pressure Relief Valve
Metallurgical & Engineering Evaluation of Cracks in Aircraft Landing Gear
Engineering Troubleshooting
Introduction to Metallurgy

 

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