A sheet of BCC iron 2.3-mm thick was exposed to a carburizing atmosphere on one side and a decarburizing atmosphere on t

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A Sheet Of Bcc Iron 2 3 Mm Thick Was Exposed To A Carburizing Atmosphere On One Side And A Decarburizing Atmosphere On T 1 (112.92 KiB) Viewed 24 times

A sheet of BCC iron 2.3-mm thick was exposed to a carburizing atmosphere on one side and a decarburizing atmosphere on the other side at 725°C. After having reached steady state, the iron was quickly cooled to room temperature. The carbon concentrations at the two surfaces were determined to be 0.011 and 0.0071 wt%. Calculate the diffusion coefficient if the diffusion flux is 3.8 × 10-8 kg/m²-s, given that the densities of carbon and iron are 2.25 and 7.87 g/cm³, respectively. Hint: Use Equation 5.12a-that is, for this problem C" 1.24E-10 = Cc CC, CFe PC PFe to convert concentrations from weight percent carbon to kilograms of carbon per cubic meter or iron. x 10³ m²/s