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Understanding Pearlite Formation in Fe-C System: Key Factors and Microstructure Evolution

Explore the formation of pearlite in the Fe-C system, including TTT curves, phase diagrams, diffusion rates, and the influence of cooling rates on steel microstructures. Learn about proeutectoid and hypoeutectoid steels and the role of carbon in steel strength.

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Understanding Pearlite Formation in Fe-C System: Key Factors and Microstructure Evolution

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  1. The Fe-C system Pearlite

  2. The Fe-C system See time-temperature-transformation (TTT) curves - this one for 0.8 w/o C Pearlite is two phases FE + CM Pearlite forms by diffusion - takes time diffusion rate high, Grxn low diffusion rate low, Grxn high

  3. The Fe-C system Proeutectoid FE starts to form Hypoeutectoid steels - cooling from AUS range

  4. The Fe-C system Hypoeutectoid steels - cooling from AUS range Eutectoid (P) forms

  5. The Fe-C system Hypoeutectoid steels - cooling from AUS range Proeutectoid FE + P P FE

  6. The Fe-C system Hypoeutectoid steels - where does C go?

  7. The Fe-C system Hypoeutectoid steels - strength vs P content

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