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An iron-carbon alloy initially containing 0.275 wt% C is exposed to an oxygen-rich and virtually carbon-free atmosphere at 1110°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 0.206 wt% after a 5 h treatment? The value of D at 1110°C is 5.6 × 10-10 m2/s.
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