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Question: Show working in detail For an imaginary sample if the concentration at the surface is to be maintained at 1.28 wt% C, and the treatment is to be conducted at 1050C and the value of D is 1.93 x 10-11 m /s. Calculate the time required to achieve a carbon concentration of 0.45 wt% at a position 2.25mm into an Fe-C alloy that initially contains 0.20 wt% C