A eutectoid alloy is similar, but the phase change occurs, not from a liquid, but from a solid solution.
12.
This will occur until the remaining concentration of solutes reaches the eutectoid level, which will then crystallize as a separate microstructure.
13.
These will continue to grow and the carbon will recede until the eutectoid concentration in the rest of the steel is reached.
14.
Two common cases of this include cooling a liquid to form an amorphous solid, and cooling eutectoid austenite to form martensite.
15.
Upon cooling a eutectoid alloy from the solution temperature, the constituents will separate into different crystal phases, forming a single microstructure.
16.
Due to the continuous heating the steel tends to eutectoid composition ( containing 0.77 to 0.8 % carbon ).
17.
On the other hand, such elements as silicon, molybdenum, and chromium tend to de-stabilize austenite, raising the eutectoid temperature.
18.
During slow cooling of an iron-carbon alloy, pearlite forms by a eutectoid reaction as austenite cools below ( the eutectoid temperature ).
19.
During slow cooling of an iron-carbon alloy, pearlite forms by a eutectoid reaction as austenite cools below ( the eutectoid temperature ).
20.
For a eutectoid steel ( 0.78 % C ), between 6 and 10 % of austenite, called retained austenite, will remain.
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