ArtMetal

Gosh, a wood fire will have to be super hot to turn the blade to a red heat. Maybe if you had a bellows or blower that would feed air to the fire. Once you get it to that heat bury the blade in the wood ash and let the fire go out overnight.

The steel should then be annealed and you should be able to work it with the hack saw. Get you a good new file and file your edges of the blade.

Then after you have done all the work on the blade, reheat it with the same red color, but this time, once you've reached the desired color, quench it in cold water. Swirl it around real fast. What you want to do is to cool it as quickly as possible so the hard carbon is held outside.