Effects Of Proper Annealing

: The Working Of Steel

Proper annealing of low-carbon steels

causes a complete solution or combination to take place between

the ferrite and pearlite, producing a homogeneous mass of small

grains of each, the grains of the pearlite being surrounded by

grains of ferrite. A steel of this refinement will machine to good

advantage, due to the fact that the cutting tool will at all times

be in contact with metal of uniform composition.

While the alternate bands of ferrite and pearlite are microscopically

sized, it has been found that with a Gleason or Fellows gear-cutting

machine that rough cutting can be traced to poorly annealed steels,

having either a pronounced banded structure or a coarse granular