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 orWidmanstätten 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 fromthe complex plates, pearlite nodules exist at the austenite grain boundaries
at temperatures below 973 K. Therefore, the lamellar cementite and ferrite in both complex
Widmanstätten plates and pearlite nodules are all product phases fromthe 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.
Complex Widmanstätten plates of cementite and ferrite, product phases of a eutectoidreaction, in an Fe–10.6 Mn–0.64 C steel have been investigated. Different forms of proeutectoidM3C carbide appear in the austenite as grain boundary precipitates orWidmanstätten plates inthe austenite at temperatures below 1048 K. Some Widmanstätten plates may consist oflamellar cementite and ferrite as complex Widmanstätten plates at temperatures below1023 K. Aside fromthe complex plates, pearlite nodules exist at the austenite grain boundariesat temperatures below 973 K. Therefore, the lamellar cementite and ferrite in both complexWidmanstätten plates and pearlite nodules are all product phases fromthe eutectoid reaction.The upper temperature limit for the eutectoid reaction is between 1023 K and 973 K. Thecomplex Widmanstätten plates have some characteristics similar to inverse bainites, butappear at much higher temperatures, near the eutectoid temperature of the steel.
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