If I could see the entire process I could tell rather closely what is likely to be occurring with the metals. Analysis of the slags and each material along the way would confirm.
The issues with binary phases is that there relevance is under idea conditions...which smelting/forging is not.
One would need to take into account trace elements and the varied oxygen content.
Iron can alloy with many metals and it may have a a greater affinity then other metals so it may form stronger bonds then other metals and lock up the other metals...or oxygen or silicon may break that bond and do away with it in the final bloom trapping it in slag.
Smelting is a rather dynamic process.
In the end I like to concept of multi metal blades, but the reality may be something less than the fantasy.
Ric
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