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Cementite or iron carbide is a substance of iron and also carbon, or more precisely, an intermediate transition steel carbide with the molecular formula Fe3C. By weight, it is 6.67% carbon and also 93.3% iron.
It is a gray-white crystalline powder with a relative thickness of 7.694. Insoluble in chilly, hot water and also weaken acid, soluble in warm concentrated hydrochloric acid to produce blends of hydrogen, methane, ethane, ethylene as well as various other extra intricate hydrocarbons as well as totally free carbon. Does not react with completely dry air. Oxidize in damp air to develop iron oxide as well as carbon. It has orthorhombic crystal structure. It is a hard and also vulnerable product, which is typically categorized as ceramic in its pure kind, and also is a common and also vital part in black metallurgy.
What is Fe3C called?
Fe3C (iron carbide) is additionally called cementite.
Just how is cementite developed?
In the process of stability condensation of iron-carbon alloy, the cementite sped up when the fluid alloy of hypereutectic alloy (hypereutectic white cast iron) is cooled down listed below the liquidus is called key cementite.
In the ledeburite framework, the point strip cementite is evenly dispersed on the austenite matrix, and this cementite is called eutectic cementite.
Pre-eutectoid phase and also cementite:
For alloys with hypoeutectoid and also hypereutectoid structure, with the decrease of temperature level, a phase forming the product of eutectoid makeover is constantly sped up with the reduction of temperature, as well as the initial precipitated phase is called proeutectoid stage, such as proeutectoid ferrite in hypoeutectoid steel and also proeutectoid cementite in hypereutectoid steel. Because of the various creating conditions, the morphology of proeutectoid stage can be separated into three kinds: block, reticulate and Widmanstatten framework.
The cementite in pearlite is called eutectoid cementite.
In the procedure of stability condensation of iron-carbon alloy, when the alloys with greater than eutectoid structure (hypereutectoid steel, hypoeutectic white actors iron, eutectic white actors iron, hypereutectic white cast iron) are gradually cooled down to a certain extent, the carbon material in austenite reaches saturation, and also the cementite will certainly precipitate along the austenite grain border with a network circulation in microstructure. This cementite sped up from austenite is called secondary cementite.
When the stability cooling of industrial pure iron is below the strong service line of carbon in iron (Fe-C equilibrium representation PQ line), the solubility of carbon in ferrite reaches saturation, as well as the temperature lowers again, and also the tertiary cementite will certainly precipitate from ferrite. The tertiary cementite precipitates from the ferrite grain border and generally distributes intermittently along the ferrite grain boundary because of its small quantity.
It describes those that exist as an independent phase outside the mechanical blend (framework) such as pearlite (eutectoid framework) or ledeburite (eutectic structure), such as pre-eutectoid cementite, main cementite and so forth.
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