Where does carbon go during decarburization in steels?

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During decarburization of steels at 700°C, carbon reacts with oxygen or hydrogen present in the atmosphere. This reaction primarily results in the formation of carbon oxides, such as CO or CO2. The specific phase of these gases at this temperature is crucial, as CO is typically a gas while CO2 can also exist in gaseous form. The carbon essentially leaves the steel surface, reducing its carbon content. Understanding these reactions is essential for controlling the properties of heat-treated steels.
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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?

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

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