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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? About cellular Transformation (or precipitation) Cellular Transformation can be in the type of or + , where all of the parent phase is consumed by the Transformation product, and the Transformation does not terminate by the gradual reduction in the growth rate, but b

Cementite (iron carbide, Fe 3C), Pearlite (88wt% ferrite, 12wt% cementite, or 99.2wt% iron, 0.8wt% carbon), Bainite, Martensite, Ledeburite (ferrite-cementite eutectic, 4.3% carbon). • Ferrite: the α-iron, is a materials science term for iron, or a solid solution with iron as the main constituent, with a body centred cubic (bcc) crystal ...

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