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An iron-carbon alloy initially containing 0.269 wt% C is exposed to an oxygen-rich and virtually carbon-free...

An iron-carbon alloy initially containing 0.269 wt% C is exposed to an oxygen-rich and virtually carbon-free atmosphere at 1040°C. Under these circumstances the carbon diffuses from the alloy and reacts at the surface with the oxygen in the atmosphere; that is, the carbon concentration at the surface position is maintained essentially at 0.0 wt% C. At what position will the carbon concentration be 0.202 wt% after a 8 h treatment? The value of D at 1040°C is 3.7 × 10-11 m2/s.

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