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Cementite (or iron carbide) is a compound of iron and carbon, more precisely an intermediate transition metal carbide with the formula Fe 3 C. By weight, it is 6.67% ...
In chemistry, a carbide usually describes a compound composed of carbon and a metal. In metallurgy, ... Iron forms a number of carbides, Fe 3 C, Fe 7 C 3 and Fe 2 C.
iron: ferrite, ferritic steel; iron: austenite, austenitic steel; iron carbide: cementite, Fe3C. It shows a eutectic and a eutectoid; these phases crystallise as a stacking of fine strips of pure phases (iron and cementite) in case of the eutectoid, or a pure iron containing small balls of cementite for the eutectic.
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When it dissolves in iron, carbon atoms occupy interstitial "holes". Being about twice the diameter of the tetrahedral hole, the carbon introduces a strong local strain field. Mild steel (carbon steel with up to about 0.2 wt% C) consists mostly of α-Fe and increasing amounts of cementite (Fe 3 C, an iron carbide).
Most of the time, carbide cutters will leave a better surface finish on a part and allow for faster machining than high-speed steel or other tool steels. Carbide tools can withstand higher temperatures at the cutter-workpiece interface than standard high-speed steel tools (which is a principal reason enabling the faster machining).
Edscottite is an iron carbide mineral, with the formula Fe 5 C 2.It was previously known to occur during iron smelting, but in 2019 was identified as occurring in nature, but not naturally occurring on earth, when it was discovered in a meteorite.
Cohenite is a naturally occurring iron carbide mineral with the chemical structure (Fe, Ni, Co) 3 C.This forms a hard, shiny, silver mineral which was named by E. Weinschenk in 1889 after the German mineralogist Emil Cohen, who first described and analysed material from the Magura meteorite found near Slanica, Žilina Region, Slovakia. [3]