Where does carbon go during decarburization in steels?

[muskie25]

Homework Statement

I understand that decarburization happens during heat treatment of steels @ 700 C, and that carbon reacts with oxygen or hydrogen that is in the atmosphere. But, where does the carbon go?

Homework Equations

None

The Attempt at a Solution

Does the carbon react with the oxygen and turn into Carbon Oxide like on the surface of the steel? Or does it turn into CO2?

 

[SteamKing]

Think. What phase are CO or CO₂ in at a temperature of 700°C?