It's easier to graduate than to learn

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Presentation transcript:

It's easier to graduate than to learn -Robert Half

Today's spelling/pronunciation/grammar lesson interstice (noun) in ter sti see interstitial (adjective) in ter sti shul

Diffusion Diffusion coefficient: flux J = D(T) dC/dx D(T) = Do exp (-Q/RT) For C diffusing in Fe: D(T) = 0.21 exp (-33.8/RT) = 6.7 x 10-11 cm2/sec @ 500° C = 4 x 10-7 cm2/sec @ 1000° C

Diffusion For C diffusing in Fe: D(T) = 0.21 exp (-33.8/RT) = 6.7 x 10-11 cm2/sec @ 500° C = 4 x 10-7 cm2/sec @ 1000° C Ex - carburizing a steel shaft: how long to carburize to depth of 1 mm x2 = D t D(1000° C) = 3 x 10-7 cm2/sec t = 10 hr D(1200° C) = 1.8 x 10-6 cm2/sec t = 1.5 hr

The Fe-C system -iron -iron -iron

The Fe-C system -iron - dissolves considerable carbon -iron - dissolves very little carbon

The Fe-C system C forms interstitial solid solutions in Fe

These are the solid solution regions The Fe-C system These are the solid solution regions (austenite) (ferrite) (austenite)

There is also a compound Fe3C (cementite) The Fe-C system There is also a compound Fe3C (cementite) (austenite) (ferrite)

The Fe-C system The two-phase regions

The Fe-C system Pearlite

Pearlite forms by diffusion - takes time The Fe-C system Pearlite is two phases FE + CM Pearlite forms by diffusion - takes time See time-temperature-transformation (TTT) curves diffusion rate high, Grxn low diffusion rate low, Grxn high

The Fe-C system Hypoeutectoid steels - cooling from AUS range 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

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