Everything about Cementite totally explained
Cementite or
iron carbide is a
chemical compound with the formula Fe
3C (or Fe
2C:Fe), and an
orthorhombic crystal structure. It is a hard, brittle material, normally classified as a
ceramic in its pure form, though it's more important in
metallurgy.
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. It mixes with
ferrite, the other product of austenite, to form
lamellar structures called
pearlite and
bainite. Much larger lamellae, visible to the naked eye, make up the structure of
Damascus steel, though the process has been lost to history.
Fe
3C is also known as
cohenite, particularly when found mixed with
nickel and
cobalt carbides in
meteorites. This form, a hard, shiny silver mineral, was first described by
E. Weinschenk in
1889.
Further Information
Get more info on 'Cementite'.
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