|Q1. A thin sheet of iron is in contact with a carburizing gas on one side...

 

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|Q1. A thin sheet of iron is in contact with a carburizing gas on one side and a decarburizing gas on the other at temperature of 1000°C. (a) Sketch the resultant carbon concentration profile when a steady state has been reached assuming the surface concentrations are maintained at 0.15 and 1.4 wt% C. (b) If D. increases from 2.5 x 10-11 m² s-i at 0.15% C to 7.7 x 10-11 m² s-1 at 1.4% C what will be the quantitative relationship between the concentration gradients at the surfaces? (c) Estimate an approximate value for the flux of carbon through the sheet if the thickness is 2 mm (0.8 wt% C = 60 kg m- at 1000°C). |Q1. A thin sheet of iron is in contact with a carburizing gas on one side and a decarburizing gas on the other at temperature of 1000°C. (a) Sketch the resultant carbon concentration profile when a steady state has been reached assuming the surface concentrations are maintained at 0.15 and 1.4 wt% C. (b) If D. increases from 2.5 x 10-11 m² s-i at 0.15% C to 7.7 x 10-11 m² s-1 at 1.4% C what will be the quantitative relationship between the concentration gradients at the surfaces? (c) Estimate an approximate value for the flux of carbon through the sheet if the thickness is 2 mm (0.8 wt% C = 60 kg m- at 1000°C).