i think annealling would be a good idea, trying to beat on that spring without it is going to do several things.
you and your budies will beat your selves senseless ( oops... to late. hes got a fire started.) and probably brake the floor.
if you manage to bang it flat you have just changed your temper by work hardening one side. work hardening tends to make a piece more brittle due to stress facters
if you want it to be able to chop a tree linb, and thats always fun, you will want the strength of a forged sword with a proper spring temper,you dont want to put "how many hours work" for "how many whacks"?( weve got a nice bed of coals going)