The SEM photgraph above show the shoulder of a punch with voids in the coating caused from a residue left on the surface from an oil that was designed to leave a protective layer. A closer look at the area effected.
The SEM photgraph above show the shoulder of a punch with voids in the coating caused from a residue left on the surface from an oil that was designed to leave a protective layer.
A closer look at the area effected.
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