Determine the carburizing time necessary to achieve a carbon concentration of 0.48 wt% at a position 4.9 mm into an iron-carbon alloy that initially contains 0.15 wt% C. The surface concentration is to be maintained at 1.1 wt% C, and the treatment is to be conducted at 1170C. Assume that Do = 5.0 x 10-5 m/s and Qd = 159 kJ/mol. The following table may be useful. Table A Tabulation of Diffusion Data Part 1 Your answer has been saved. See score details after the due date. From Equation 6.5 calculate the Gaussian error function: erf (von) .65 Part 2 Your answer has been saved. See score details after the due date. Find the value of = z using the table below. 2Dt Table Tabulation of Error Function Values What is (or z)? 2V Dt 21 DE 0.6648 Part 3 Calculate D, the diffusion coefficient, in m/s at the specified temperature. D = i m/s