Cementite
What is Cementite?
Cementite, also known as iron carbide, is a chemical of iron and carbon, with the rule Fe3C (or Fe2C:Fe). It is 6.67 percent carbon and 93.3% iron. It has orthorhombic element knowledge. Cementite is iron carbide with the formula Fe3C, and an orthorhombic crystal structure. It is a hard, brittle material, essentially a ceramic in its pure form. Cementite contains 6.67% Carbon by weight; thus above that carbon content in the Fe-C phase system, the alloy is no longer steel or cast iron, as all of the available iron is contained in cementite.
Cementite mixes with ferrite, the other product of austenite, to form lamellar structures called pearlite and bainite. Fe3C is also known as cohenite, particularly when found mixed with nickel and cobalt carbides in meteorites. Steel which has cooled slowly from a high temperature contains ferrite and pearlite in relative proportions varying with the chemical composition of the steel. Pearlite is a lamellar structure of ferrite and cementite.
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