Re: [CAD_CAM_EDM_DRO] Re:heat treat nomenclature

Hi Wally:
Heating to above the critical temperature "Cherry red" and quenching is
called hardening.
Re-heating a hardened piece to some temperature below (usually substantially
below) the critical temperature and then cooling is called tempering.
Reheating to above the critical temperature and cooling slowly is called
annealing.
This last cycle can also be used for stress relieving or normalizing, but is
normally done at somewhat lower temperatures.
All are heat treating of one sort or another.
Cheers

Marcus