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

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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 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

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

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

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

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

1.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 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

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