Overview

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Cementite, also known as iron carbide, is a chemical compound of iron and carbon, with the formula Fe3C (or Fe2C:Fe). By weight, it is 6.67% carbon and 93.3% iron. It has an orthorhombic crystal structure. It is a hard, brittle material, normally classified as a ceramic in its pure form, though it is more important in metallurgy. In the iron-carbon system (i.e. plain-carbon steels and cast irons) it is a common constituent because ferrite contains at most 0.02wt% of carbon. Therefore, in carbon steels and cast irons that are slowly cooled a portion of the elements are in the form of cementite. It forms directly from the melt in the case of white cast iron. In carbon steel, it either forms from austenite during cooling or from martensite during tempering. An intimate mixture with ferrite, the other product of austenite, forms a lamellar structure called pearlite.

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