What does Fe3C mean?
Iron carbide Fe3C is also called cementite.
How does cementite form?
When the iron-carbon mixture is in equilibrium crystallization, cementite forms. The liquid of hypereutectic alloy (hypereutectic cast iron), is then cooled to below its liquid state.
Eutectic cemented cementite:
Ledeburite structures have a point-strip cementite that is uniformly distributed in the matrix of austenite. This is known as eutectic or eutectic cemite.
The pre-eutectoid and cementite phases of
Alloys of hypoeutectoid-hypereutectoid composition are always precipitated when the temperature drops. This is the case for proeutectoid phases such as proeutectoid iron in hypoeutectoid Steel and proeutectoid cementite, which is hypereutectoid Steel. Because of different conditions for forming, proeutectoid morphology can be broken down into block, Widmanstatten, and reticulate.
Eutectoid is the name of cementite that’s found in pearlite.
When iron-carbon alloys are slow cooled, such as hypoeutectic iron cast iron, hypoeutectic iron cast iron, or hypereutectic iron cast iron), the carbon content in austenite will reach saturation. The cementite then forms along the austenite grain border with an eutectic and eutectic distribution of microstructure. The secondary cementite, which is precipitated in austenite from the iron-carbon alloy, can be called.
If the equilibrium cooling rate of iron in industry is lower than the line PQ of carbon-in-iron (FeC equilibrium diagram), then the solubility and temperature in the ferrite reach saturation. Then the temperature falls again. Due to its low quantity, the tertiary cemite is precipitated from the ferrite grain boundary. It generally occurs intermittently along that boundary.
These are those which exist outside of the mechanical mixture, like pearlite (eutectic structural) or ledeburite.
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