Macro inclusion and void, courtesy of Robert Rambler. 1895 Ithaca Crass with damascus barrels that were being cleaned up for reblueing. Initially just a small pit on the surface of the barrels, quickly grew into what you see here as polishing continued. Inside the barrels are bright and smooth, giving no indication of a flaw.



Machined barrel segment loaded in the tensile machine and fitted with an extensometer at METL. One of the machined segments from a Smith Twist barrel fractured at a much lower tension than the others, and there was a visible inclusion at the fracture. The inclusion was felt to be slag (silicates, phosphorus, sulfur and metal oxides) based on the appearance and Energy Dispersive X-ray Spectroscopy (EDX) spectrum.


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