Iron Phase

Iron - carbon up to 2% -> steels
>2% -> cast iron

Eutectoid point
- 0.8% carbon
- temperature 732 deg C

Austenite
- carbon steel at high temperature.
- Face Center Cubic

Example
18-8 (18% Cr and 8% Ni) -> Stainless Steel

Ferrite
- Body Center Cubic (BCC) can hold very little carbon typically 0.0001% at room temperature (pure iron)

Cementite
- very hard
- consist of 6.7% carbon

Martensite
-

Hypereutectoid
- steels with 0.77% < carbon < 1.7% carbon (high carbon steel)