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Iron Carbon Diagram

A look through the iron carbon diagram, what it all means and what it all looks like.
by

Stephen Wilson

on 14 November 2013

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Transcript of Iron Carbon Diagram

Iron Carbon Diagram
Or 'everything you wanted to know about carbon steel but were afraid to ask'
Carbon %
Plain Carbon steels are usually alloys of steel and carbon up to 1.7% carbon. In practice most ordinary steels also have 1% manganese left over from their production. From 2% to 4% we have cast iron.
910 -
Below 910 Degrees C Pure iron has a BCC structure
Fe
Fe
Fe
Fe
Fe
Fe
Fe
Fe
C
Body Centered Cubic
Not much space for carbon.
Only up to 0.02%
Add heat and take iron over 910 deg C and you get this.
Fe
Fe
Fe
Fe
Fe
Fe
Fe
Fe
C
C
C
C
C
So thats six carbon atoms (don't forget the one hidden round the back). Now we can cram up to 2% carbon in there.

Remember, this change happens while the material is still solid.
FACE CENTERED CUBIC
0.83%
These are CRITICAL TEMPERATURES
Definitions
Putting things in the gaps. In this case refering to shoving the carbon atoms in the gaps between the Iron atoms.
Intersitial:
Peritectic:
Steel is heated, steel absorbs carbon.
Steel cools. As the steel cools some of it forms a solid while some of the steel is still liquid.
The solid reacts with the liquid.

The metal in g is called Austenite up to a maximum of 2.11% carbon in the rest of these areas there is a mixture of austinite and other phases.
This is called Ferrite up to 0.02% carbon
Full transcript