Iron carbide

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Iron carbide - metastable intermediate phase (transition phase, also known as intermetallic phase), formed as a result of ordering the distribution of carbon atoms occurring in solid carbon solutions in the iron lattice. Carbides are non-stoichiometric compounds (bertolidy).

Coal forms carbides with transition metals of groups IVA to VIIA and with iron. According to Goldschmidt, carbides with crystal lattice are distinguished:

Fe3C cementite - cementite - (of various sizes and shapes) belong to the most important elements of the steel and cast iron structure (see: phase diagram Fe-Fe3C). They are created as:

Fe2C carbide occurs in hardened and low-carbon steel and in the lower bainite. In the hexagonal network Fe (A3), carbon atoms are located in octahedral hatches. Every second layer of gaps is filled. The actual chemical composition of the carbide is close to Fe2C, because not all the gaps of these layers are filled with carbon atoms.

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