• WordNet 3.6
    • n pearlite a lamellar mixture of cementite and ferrite formed during the cooling of austenite; a constituent of steel and cast iron
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Webster's Revised Unabridged Dictionary
    • n Pearlite (Min) A glassy volcanic rock of a grayish color and pearly luster, often having a spherulitic concretionary structure due to the curved cracks produced by contraction in cooling. See Illust. under Perlitic.
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Century Dictionary and Cyclopedia
    • n pearlite The eutectoid of Steel. All slowly cooled steel containing 0.90 per cent. of carbon consists entirely of pearlite. With more than this amount of carbon, steel consists of pearlite associated with microscopic crystals of cementite; with less than 0.90 per cent. of carbon, it consists of pearlite and microscopic crystals of ferrite. Pearlite has a laminated structure, and consists of 86.5 per cent. of ferrite and 13.5 per cent. of cementite, in microscopic flakelets or crystals in the form of thin plates or scales, intimately mixed, and usually requiring a magnification of a thousand diameters to disclose it.
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In literature:

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

In news:

Typically, steel is heated to its austenitization temperature and then cooled sufficiently fast to avoid pearlite transformation and obtain maximum hardness and strength.

In science:

Pearlites are a eutectic mixture of bcc Fe and the carbide consisting of alternating stripes.
Arrested States of Solids