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4. An FCC Fe-C alloy is carburized, what would be the concentration at 1 mm below the surface? (20 points) Co = 0.25 wt% carbon; Cs = 1.20 wt% carbon; D = 1.6 x 10-11 m/s; t = 25369 s 2 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.0 1.1 1.2 erf) 0.5633 0.6039 0.6420 0.6778 0.7112 0.7421 0.7707 0.7970 0.8209 0.8427 0.8802 0.9103