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I suppose if the chain was new and sharp enough it might have a chance, but it would be far more likely that both chains would break and you would die a horrible death. So no trying it!
Absolutely! A chain saw "cuts" by applying friction. By rotating the chain quickly, a chain saw wears down the materials it seeks to cut. A metal chain saw could eventually cut through another metal chain saw - but the chain of the active chain saw would need to be replaced a few times before it was successful. Friction works both ways - it wears down the material to which is applied and also is worn down by it. Instead, a stronger material - like a diamond chain (yes, those diamonds) - could be used to cut through the metal with more ease.