Pearlite is a constituent found in all annealed carbon steels.
"The Working of Steel" by Fred H. Colvin
If heated above 670deg, pearlite becomes homogeneous, and forms martensite.
"The Phase Rule and Its Applications" by Alexander Findlay
The percentage of pearlite and of free ferrite or cementite in these products is shown in fig.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 7" by Various
Pearlites are a eutectic mixture of bcc Fe and the carbide consisting of alternating stripes.
Arrested States of Solids