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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 by the impingement of adjacent cells growing with a constant velocity (see Figure below, cited from the Book, "Phase Transformations in Metals and Alloys", by D.)

• When the solution above the transformation point is solid, rather than liquid, an analogous eutectoid transformation can occur. For instance, in the iron-carbon (Fe-C) system, the austenite phase can undergo a eutectoid transformation to produce ferrite

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