The Iron-Carbon System

LECTURE PRESENTATION

Reading Assignment

  • 4.4 Iron-Carbon Equilibrium Phase Diagrams
  • 4.5 Steels and the simplified Iron-Carbon Diagram
  • 4.6 Cast Irons

Recommended Reading:

Outline

The Iron-Carbon Phase Diagram

Eutectoid point

What is liquid, what is solid

Major Iron Forms

Ferrite or alpha iron (BCC)

Austenite or gamma iron (FCC)

Cementite, or iron carbide, or Fe3C

Delta ferrite, or delta Iron (BCC)

Cast Iron Vs. Steel

Equilibrium Cooling

Peralite

Hypoeutectoid Alloys

Proeutectoid alpha

Hypereutectoid Alloys

Proeutectoid cementite

Effects of Alloying elements

Titanium

Molybdenum

Nickel

Chromium

Non-Equilibrium Cooling

Time-Temperature Transformation Diagrams (T-T-T)

Coarse Pearlite

Fine Pearlite

Bainite

Martensite


 Additional Information

Video – Prof. Scott Ramsay solves an Fe-C phase diagram question from the December 2010 MSE101 final exam.

Link –  University of Cambridge. Martensite and Martensitic Phase Tranformations

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