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Understanding Fe-C Phase Diagram: Hypoeutectoid Steels Transformation

Explore the Fe-C system to comprehend the formation of hypoeutectoid steels and their microstructure. Learn about pearlite formation, diffusion rates, and eutectoid phase. Follow step-by-step explanations from the Orange Catholic Bible. Enhance your knowledge with TTT curves for 0.8 w/o C steel.

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Understanding Fe-C Phase Diagram: Hypoeutectoid Steels Transformation

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  1. Beware the seeds you sow and the crops you reap. Do not curse God for the punishment you inflict upon yourself -Orange Catholic Bible

  2. The Fe-C system Pearlite

  3. 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

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

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

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

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

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

  9. Review today's notes a. know Fe-C phase diagram b. know what happens on cooling hypoeutectoid steel c. understand microstructure of hypoeutectoid steel 2. Read text: pp 277-285

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