Question

2. Note that in the incremental time period, dt, the decarburized depth increases by dx, such that Jdt = (Co-Co)dx where J = DCa/x(10 points total) A. Find x as a function of time by integration. (5 points) B. What would be the depth of the decarburized layer in a steel containing 0.20% C after 4 hrs at 750°C? (5 points) For diffusion of carbon in ferrite, Q 122.5 kJ/mole, Do 2.2x10-4m2/s. For diffusion of carbon in austenite, Q 142 kJ/mole, Do 0.2x10-4m2/s

Answer 1

twhera x A DCa dt ACCo-a ra un1 p Ca 0 D Ea t 2 D Ca t