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11-04+06-Lecture - Phase Transformations ENGR 213...

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Phase Transformations ENGR 213
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STRENGTHENING MECHANISMS FOR METALS Mechanisms discussed - dislocation based grain size refinement solid-solution / alloying deformation / strain hardening Alternative procedures microstructure control phase diagram ONLY for equilibrium conditions t effect (nucleation, growth) NOT on phase diagram nonequilibrium structures common precipitation hardening multiple heat treatments
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PHASE TRANSFO’S - 1 eutectoid reaction austenite to pearlite very t & T sensitive typical exponential law - Avrami eq rate r is 1/t 0.5
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isothermal transformation diagram (TTT) constant composition lines of const micro- structure amounts coarse pearlite fine pearlite this fig - eutectoid composition other compositions, get proeutectoid phases
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Proeutectoid Example - 1.13% wt C A - austenite P - pearlite C - cementite 1.13% C
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Other Microconstituents from Austenite - 1 bainite ferrite matrix + cementite
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