The name perlite (also spelled pearlite) comes from the French word perle which means pearl, in reference to the "pearly" luster of classic perlite.    From Wordnik.com.  [Featured Articles - Encyclopedia of Earth] Reference

The name perlite (also spelled pearlite) comes from the French word perle which means pearl, in reference to the “pearly” luster of classic perlite.    From Wordnik.com.  [Perlite] Reference

The cementite, although adding to the tensile strength, is very brittle and the strength of the pearlite is the combination of the ferrite and cementite.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

This structure of thin sheets has received the name "pearlite," because of its pearly appearance under sunlight.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

When cooled slowly below 670 degrees, martensite yields a heterogeneous mixture of pearlite and ferrite (or cementite, if the original mixture contained between 0.8 per cent. and two per cent. of carbon).    From Wordnik.com.  [Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86] Reference

He suggested to me a theoretical problem left over from his work during the war on the cooling of steel through the austenite-pearlite transition, and I learned a fair amount of metallurgy in order to understand the physical basis of the phenomenon.    From Wordnik.com.  [Aaron Klug - Autobiography] Reference

The dark grains are pearlite, separated by white films of iron carbide (cementite).    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

Higher carbon steels show films of cementite outlining grains of pearlite (Fig. 48).    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

If the steel then cools slowly, it transforms to pearlite and a primary microconstituent.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

Sorbite is softer and tougher than troostite, and is habitually associated with pearlite.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

This keeps the woody matter and pearlite in the potting soil from floating when you water it.    From Wordnik.com.  [ScrippsNews] Reference

Cool in air-to-room temperature, preserving the equilibrium amounts of primary ferrite and pearlite.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

Just at this moment the lamination of pearlite, which now occupied its original area, was taking place.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

Tiny white granules of pure iron (ferrite) have small accumulations of dark-etching pearlite interspersed between them.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

A final steel will be composed of pearlite; ferrite and pearlite; or cementite and pearlite, according to the carbon content.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

Any of these operations not only allows the transformations from austenite to pearlite to proceed, but also relieves internal stresses in the steel.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

Pure iron, having no carbon, naturally would show no pearlite when examined under a microscope; only abutting granules of iron are delicately traced.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

As soon as a little carbon enters the alloy and a soft steel is formed, small angular areas of pearlite appear at the boundaries of the ferrite crystals (Fig. 47).    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

At that moment, in fact, the ferrite, cementite or pearlite which previously existed has lost its identity by everything going into the solid solution called austenite.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

With about 0.2 per cent carbon and 8 per cent nickel, the steel is nearing the stage between pearlite and martensite, and the structure is extremely fine, the ferrite and pearlite having.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

Its components are tending to coagulate into pearlite, and will do so in a fairly short time at temperatures near the lower critical, which heat will furnish the necessary molecular freedom.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

For annealing the simpler types of low-carbon steels the following temperatures have been found to produce uniform machining conditions on account of producing uniform fine-grain pearlite structure.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

Slide 8: Figure 12.3 Electron micrographs of (a) pearlite, (b) bainite, and (c) tempered martensite, illustrating the differences in cementite size and shape among these three microconstituents ( 7500).    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

Subsequent cooling gives a coarse texture, or an arrangement of ferrite, cementite and pearlite grains which is greatly coarsened, reflecting the condition of the austenite crystals from which they were born.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

If the steel be then cooled, the austenite breaks up into new crystals of ferrite, cementite and pearlite; and in general if the temperature has not gone far above the critical, and cooling is not excessively slow, a very fine texture will result.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

The rock band room, on the other hand, is in the single-story part of the house, so taking a recip saw to the ceiling gets one a face full of the history of home insulation: pearlite, cellulose, fiberglass, roofing debris, and ... a crocheted rug.    From Wordnik.com.  [Common Monkeyflower -] Reference

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.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

With increasing carbon in the steel the volume of iron crystals becomes less and less, and the relative amount of pearlite increases, until arriving at 0.90 per cent carbon, the large ferrite crystals have been suppressed and the structure is all pearlite.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

At faster cooling rates, however, the microstructure almost fully transforms into martensite; increasing from approximately 15\% martensite, 85\% bainite / pearlite to 87\% martensite, 13\% bainite / pearlite at the highest cooling rate, based on a point-count method.    From Wordnik.com.  [Machine Design -] Reference

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 structure.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

Cementite is a definite compound of iron and carbon represented by the formula Fe 3 C. When cooled slowly below 670o, martensite yields a heterogeneous mixture of pearlite and ferrite (or cementite, if the original mixture contained between 0.8 per cent. and two per cent. of carbon).    From Wordnik.com.  [The Scientific Monthly, October-December 1915] Reference

In the ordinary practice of hardening steels, the quenching is not so drastic, and the transformation of austenite back to ferrite and cementite is more or less completely effected, giving rise to certain transitory forms which are known as "martensite," "troostite," "sorbite," and finally, pearlite.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

Sorbite is believed to be an early stage in the formation of pearlite, when the iron and iron carbide originally constituting the solid solution (austenite) have had an opportunity to separate from each other, and the iron has entirely passed into the alpha modification, but the particles are yet too small to be distinguishable under the microscope.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

Sorbite (dark patches) passing into pearlite.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference