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An iron-carbon alloy initially containing 0.319wt%C is exposed to an oxygen-rich and virtually carbon-free atmosphere at 1190C. Under these circumstances the carbon diffuses from the
An iron-carbon alloy initially containing 0.319wt%C is exposed to an oxygen-rich and virtually carbon-free atmosphere at 1190C. 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 0.0wt%C. At what position will the carbon concentration be 0.239 wt\% after a 6h treatment? The value of D at 1190C is 9.01011m2/s
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