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Published byAusten Sullivan Modified over 9 years ago
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1545 1 2 3 1.ECTECTIC 2.PERITECTIC 3.EUTECTOID 1537 Cementite Fe 3 C
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Fe- C diagram- REGIONS HYPOEUTECTOID HYPEREUTECTIC HYPEREUTECTOID STEEL CAST IRON 1131 723 0.8 2 4.3 1545 1537 0.16 1493 6.7 HYPOEUTECTIC
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Fe- C diagram- simplified R P Q C 100 Fe Austenite+cementite- LEDEBURITE Ferrite + Cementite- PEARLITE MARTENSITE- a metastable phase of steel- by quenching- highly stressed α iron supersaturated with carbon
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EUTECTIC REACTION EUTECTIC TEMPERATURE LIQUID α+ β
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Location 1- Eutectic Reaction
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PERITECTIC REACTION Liquid + β α Peritectic Temperature PERI in Greek- Around
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Location 2- Peritectic Reaction δ Iron - BCC - γ Iron – FCC - AUSTENITE
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EUTECTIOD REACTION SOLID 1 SOLIDS 2 & 3 EUTECTIOD TEMPERATURE
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Location 3- EUTECTOID REACTION 0.8% C FERRITE α +γ γ FERRITE + CEMENTITE δ Iron - BCC – Max. solubility of 0.1% at 1493 0 C γ Iron – FCC – AUSTENITE- max. solubility of 2% at 1131 0 C α Iron – BCC- max. solubility of 0.22% at 723 0 C – FERRITE Fe 3 C –CEMENTITE - 100% iron carbide - Intermetallic Compound - From Latin caementum, meaning stone chips. –
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723 0 C 910 0 C
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Unit cells AusteniteFerriteMartensite FCC BCC RECT.PRISM- BC Tetragonal
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Effect of carbon % (by weight) on lattice dimensions Fe atom C atom Carbon % c (nm)a (nm) 00.286 0.200.2880.2858 0.400.2910.2856
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