Abstract
Complex Widmanstätten plates of cementite and ferrite, product phases of a eutectoid reaction, in an Fe–10.6 Mn–0.64 C steel have been investigated. Different forms of proeutectoid M3C carbide appear in the austenite as grain boundary precipitates or Widmanstätten plates in the austenite at temperatures below 1048 K. Some Widmanstätten plates may consist of lamellar cementite and ferrite as complex Widmanstätten plates at temperatures below 1023 K. Aside from the complex plates, pearlite nodules exist at the austenite grain boundaries at temperatures below 973 K. Therefore