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2. An FCC iron-carbon alloy initially containing 0.40 wt% C is exposed to an oxygen-rich and virtually carbon-free atmosphere

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It is a non steady state diffusion problem and such type of problem can be solved by using given equation

C(x,t) – C. – 1-erf (DI Cy -

for fcc Iron- corbon alloy Initial carbon concentration - Co= 0.4 wty.c concentration at certain depth x = c(«,t) = 0.25 wtyc0.6 erf(2) 0.6039 O-GAS 0.692 2 0.65 0.25 0.65 using lines interpolation 2-0.6 0.625-0.6039 0.65-0.6 0.692-0.6039 1:2= 0.6876

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