I asked if this would have happened if it was already normalized.
Thermocycling will help with the coarseness of the grain.
Tempering will give it bend without the break and leave an
edge that will hold its sharpness.
And Lesson learned, do not forge below forging temps.
Fortunately, there was enough left of this Fully Forged Hunting Knife that I broke to turn it into a hidden tang.
Thermal cycling is a process in which material is cooled and
heated in cycles.
Normalizing is to bring or return a substance to a standard
or normal condition or state.
As knife makers we thermal cycle our steel to return it to a normalized state, so we call it normalizing or normalization.
I needed to make sure this metal would normalize correctly.
After straightening the tines, I found just a light hammer blow would cause the
metal to break as shown in the photo to the right. So, I ran a test.
To normalize it, I brought it to nonmagnetic three times,
and let it cool in the vise. After normalizing a tried several times to break
it and it did not break after several hammer blows.
It was then heat treated as described earlier. The normal
test all passed after tempering as well.