FIG. 18.18 Rate of nucleation (N) of pearlite as a function of time. Eutectoid steel transformed at 680C. (Mehl, R. F., FIG. 18.19 Variation of N and G with temperature and Dube, A., Phase Transformations in in an eutectoid steel. (Mehl, R. F., and Dube, A., Solids, John Wiley and Sons, Inc., New Phase Transformations in Solids, John Wiley and York, 1951, p. 545.) Sons, Inc., New York, 1951, p. 545.) (a) Determine, using the curves obtained in Prob. .4, the times required to obtain 1 percent and 99 percent pearlite at 700 and 550C. (b) Compare these times with the experimental data for an eutectoid plain-carbon steel shown in the time-temperature-transformation diagram (TTT) in Fig. 18.21 in the textbook. Is the agreement reasonable? FIG. 18.18 Rate of nucleation (N) of pearlite as a function of time. Eutectoid steel transformed at 680C. (Mehl, R. F., FIG. 18.19 Variation of N and G with temperature and Dube, A., Phase Transformations in in an eutectoid steel. (Mehl, R. F., and Dube, A., Solids, John Wiley and Sons, Inc., New Phase Transformations in Solids, John Wiley and York, 1951, p. 545.) Sons, Inc., New York, 1951, p. 545.) (a) Determine, using the curves obtained in Prob. .4, the times required to obtain 1 percent and 99 percent pearlite at 700 and 550C. (b) Compare these times with the experimental data for an eutectoid plain-carbon steel shown in the time-temperature-transformation diagram (TTT) in Fig. 18.21 in the textbook. Is the agreement reasonable