coarse lamellar pearlite termin techniczny
coarse pearlite termin techniczny

If cooled a little faster, then coarse pearlite will form.

Full annealing requires very slow cooling rates, in order to form coarse pearlite.

Generally speaking, cooling swiftly will leave iron carbide finely dispersed and produce a fine grained pearlite (until the martensite critical temperature is reached) and cooling slowly will give a coarser pearlite.