FIG. 67.—Peg withdrawn at 750°C. (magnified 25 diameters). The structure is apparently unaltered, but the peg was hard and, unlike the earlier ones, would not bend double.
FIG. 68.—A portion of 66 magnified 200 diameters to show that the dark (pearlite) areas are laminated.
FIG. 69.—A portion of 67 magnified 200 diameters, showing that pearlite areas are no longer laminated and providing reason for observed hardness
FIG. 70.—Peg withdrawn at 780°C. (magnified 25 diameters), showing inter-diffusion of transformed pearlite and ferrite areas.