14. What nitridation time is required to achieve a N concentration Of 0.50 wt% at a position 1.0 mm into a FCC iron that initially contains 0.10 wt% N? The surface concentration is held constant at 1.5 wt% N, and the nitridation process is done at 1000 C. a) Draw the concentration profile (CN vs. x), labelling with axes (with units) and indicating all of the relevant values on the x and y axes. (5 pts) b) Solve for the nitridation time. Show work. (10 pts)