the lamellar cementite and ferrite in both complex Widmanstätten plates and pearlite nodules are all product phases from the eutectoid reaction. The upper temperature limit for the eutectoid reaction is between 1023 K and 973 K. The complex Widmanstätten plates have some characteristics similar to inverse bainites, but appear at much higher temperatures, near the eutectoid temperature of the steel.