Fe3C: What does stand for?
Iron carbide Fe3C can also be called cementite.
How is cementite formed?
The iron-carbon alloy mixture crystallizes in equilibrium and cementite develops. This is the hypereutectic mixture (hypereutectic iron) and it’s then cooled down to below its liquidus temperatures.
Eutectic Cemented Cementite:
Ledeburite structures feature a narrow strip of cementite which is uniformly distributed within an austenite matrix.
The preeutectoid-cementite phase of
Alloys of hypoeutectoid-hypereutectoid composition are always precipitated when the temperature drops. The same is true for proeutectoid stages such as the proeutectoid iron, hypoeutectoid Iron and proeutectoid cementedite. This is hypereutectoid Metal. Due to the different conditions that are required for formation, proeutectoid phases can be separated into Widmanstatten (block), and reticulate.
Eutectoid, the name for cementite which is found in pearlite.
The carbon content of austenite can be reached saturation if iron-carbon alloys such as hypoeutectic ferrous cast iron, hypereutectic ferrous cast iron, and hypoeutectic fer cast iron are slow cool. This cementite is formed along the austenite grain boundary with an underlying microstructure network. You can also call the secondary cementite which is formed in austenite by precipitating iron-carbon alloy.
When the iron’s equilibrium temperature drops below the PQ line in the carbon-iron solution in industry, it is known as saturation. This means that the ferrite will not sorb water and the temperature will reach saturation. It then drops back to normal. The tertiary carbonite, due to its very low amount, is precipitated at the ferrite grains boundary. It usually occurs along the boundary only intermittently.
These are the ones that exist beyond the mechanical mixture.
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