Need help Determine the ASTM grain-size number of the carbon steel shown, Estima

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Determine the ASTM grain-size number of the carbon steel shown, Estimate the average grain diameter in mm. The total grain boundary area in mm2. Compute the diffusivity (diffusion coefficient) of copper in aluminum at 650 degree C. A plate of iron of thickness 5 mm is exposed to an atmosphere having a carbon concentration of 1.2 kg / m3 on one side and 0.8 kg / m3 on the other at 700 degree C. If a condition of steady state is achieved on both surfaces, calculate the diffusion flux of carbon atoms through the plate in kg/m2s. The diffusion coefficient of carbon in iron at this temperature is 3 times 10-11 m2 / s.

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