What does Fe3C mean?
Fe3C, also known as iron carbide, is also called cementite.
How do you make cementite?
When the liquid alloy of iron-carbon alloy (hypereutectic yellow cast iron), is cooled below the liquidus, the cementite precipitates.
Eutectic cemented cementite:
The ledeburite structure has a point strip cementite that is uniformly distributed in the austenite matrix. This is called eutectic or eutectic cemite.
Preeutectoid phase, cementite:
Alloys with hypoeutectoid/hypereutectoid composition will precipitate with a decrease in temperature. The first precipitated phase of eutectoid conversion is called proeutectoid. Because of the differences in forming conditions, proeutectoid morphology can be divided into three types, block, reticulate, and Widmanstatten structures.
Eutectoid cementite refers to the cementite found in pearlite.
When iron-carbon alloys are slow cooled, such as hypoeutectic iron, hypoeutectic iron cast iron, hypereutectic iron cast iron), the carbon content in austenite is saturated. The cementite will then precipitate along austenite grain boundaries, with a network distribution and microstructure. Secondary cementite is the cementite formed from austenite.
The equilibrium cooling temperature of industrial pure iron falls below the solid solution line for carbon in iron (Fe -C equilibrium diagram Q line), at which point the solubility in carbon in ferrite reaches saturation. At this point, the temperature drops again and the tertiary cemented from ferrite. Because of its small amount, the Tertiary Cementite is precipitated from the Ferrite grain boundary. It generally spreads intermittently along that boundary.
It refers only to those that exist outside of the mechanical mixture (structure), such a pearlite (eutectoid) or ledeburite.
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