Yeah, many people forge blades out of saw blades, chain, leaf springs, and other mechanical parts or tools because they are made of alloy high carbon steels that either have high toughness like leaf springs, or high hardness/hardenability like saw blades.
I have some old logging mill saw blades that I got from a distant relative. They are large wide bandsaw blades, so they are already flat, but they would require full annealing and normalizing in order to restore them for proper heat treatment to use for a knife or sword.