Wouldn't this be a rather common-place activity in "real" smithing? :shrug:
In many cases, forged items could not be reused due to the very process used to first forge them. They become brittle and would not break down into their constituent components; basically a one-way chemical reaction has already occurred during the forging process. This is especially true of alloys, as one example.
EDIT: But of course that's more realistic; in game, who knows?