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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 belo)

phase, the kinetic product of rapid cooling of steel containing sufficient carbon. • Bainite: first described by E. S. Davenport and Edgar Bain, is a phase that exists in steel microstructures after certain heat treatments. Bainite is one of the decomposition products that may form when austenite is cooled past the eutectoid temperature of ...

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