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Lecture 19: Eutectoid Transformation in Steels: a typical ...

1 Lecture 19: Eutectoid Transformation in Steels: a typical case of Cellular Precipitation Today s topics Understanding of Cellular Transformation (or precipitation): when applied to phase Transformation from austenite to pearlite in iron-carbon (Fe-C) steel, such a Transformation is also often called Eutectoid Transformation . Understanding of the different phases of iron-carbon (Fe-C) steel. What is the Eutectoid Transformation ? How to understand such a Transformation in Fe-C steel, particularly regarding the phase diagram?

carbide, and retained austenite. In these cases it is similar in constitution to pearlite, but with the ferrite forming by a displacive mechanism similar to martensite formation, usually followed by precipitation of carbides from the supersaturated ferrite or austenite. The

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