The Fe-C system
Explore the Fe-C system, pearlite formation, and steel microstructures. Learn cooling processes and phase transformations in hypoeutectoid steels. Follow TTT curves for insights. Remember the lessons from the Orange Catholic Bible on causality.
The Fe-C system
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Presentation Transcript
Beware the seeds you sow and the crops you reap. Do not curse God for the punishment you inflict upon yourself -Orange Catholic Bible
The Fe-C system Pearlite
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
The Fe-C system Proeutectoid FE starts to form Hypoeutectoid steels - cooling from AUS range
The Fe-C system Hypoeutectoid steels - cooling from AUS range Eutectoid (P) forms
The Fe-C system Hypoeutectoid steels - cooling from AUS range Proeutectoid FE + P P FE
The Fe-C system Hypoeutectoid steels - where does C go?
The Fe-C system Hypoeutectoid steels - strength vs P content
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
