This part of the tutorial concentrates on steels. In their simplest form, steels are alloys of iron (Fe) and carbon (C), so we will be looking at phase transformations using the Fe-C phase diagram. This is a fairly complex phase diagram but we are only interested in the steels part of the diagram (up to around 7% carbon).

Steels have been important to engineers for so many years that each phase has inherited a name as well as a Greek letter, so both terms will be used.

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