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1545

1545. 2. 1537. 1. 3. ECTECTIC PERITECTIC EUTECTOID. Cementite Fe 3 C. 1537. 1545. 1493. 4.3. 2. 1131. 0.16. 0.8. 723. HYPEREUTECTIC. HYPOEUTECTIC. HYPEREUTECTOID. HYPOEUTECTOID. 6.7. STEEL. CAST IRON. Fe- C diagram- REGIONS. Fe- C diagram- simplified.

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1545

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  1. 1545 2 1537 1 3 • ECTECTIC • PERITECTIC • EUTECTOID Cementite Fe3C

  2. 1537 1545 1493 4.3 2 1131 0.16 0.8 723 HYPEREUTECTIC HYPOEUTECTIC HYPEREUTECTOID HYPOEUTECTOID 6.7 STEEL CAST IRON Fe- C diagram- REGIONS

  3. Fe- C diagram- simplified Austenite+cementite-LEDEBURITE C Ferrite + Cementite-PEARLITE MARTENSITE- a metastable phase of steel- by quenching- highly stressed α iron supersaturated with carbon 100 Fe P Q R

  4. EUTECTIC REACTION LIQUID EUTECTIC TEMPERATURE α+ β

  5. Location 1- Eutectic Reaction

  6. PERITECTIC REACTION Liquid + β Peritectic Temperature α PERI in Greek- Around

  7. Location 2- Peritectic Reaction δ Iron - BCC - γ Iron – FCC - AUSTENITE

  8. EUTECTIOD REACTION SOLID 1 EUTECTIOD TEMPERATURE SOLIDS 2 & 3

  9. Location 3- EUTECTOID REACTION δ Iron - BCC – Max. solubility of 0.1% at 14930C γ Iron – FCC – AUSTENITE- max. solubility of 2% at 11310C α Iron – BCC- max. solubility of 0.22% at 7230 C – FERRITE Fe3C –CEMENTITE - 100% iron carbide - Intermetallic Compound - From Latin caementum, meaning stone chips. – γ α +γ 0.8% C FERRITE + CEMENTITE FERRITE

  10. 9100C 7230C

  11. Unit cells Austenite Ferrite Martensite BCC RECT.PRISM- BC Tetragonal FCC

  12. Effect of carbon % (by weight) on lattice dimensions Fe atom C atom

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