We discovered a eutectoid reaction in an Fe-13.4Mn-3.0Al-0.63C (wt pct) steel after solution heat treatment at 1373 K (1100°C) and holding at temperatures below 923 K (650°C). The steel is single austenite at temperatures from 1373 K to 923 K (1100°C to 650°C). A eutectoid reaction involves the replacement of the metastable austenite by a more stable mixture of ferrite and M 23 C 6 phases at temperatures below 923 K (650°C). The mixture of ferrite and M 23 C 6 is in the form of pearlitic lamellae. The morphology of the lamellae of the product phases is similar to that of pearlite in steels. Thus, we found a new pearlite from the eutectoid reaction of the Mn-Al steel featuring c fi a + M 23 C 6 . A Kurdjumov-Sachs (K-S) orientation relationship exists between the pearlitic ferrite (a) and M 23 C 6 (C6) grains, i.e., (110) a // (111) C6 and [111] a // [011] C6 . The upper temperature limit for the eutectoid reaction is between 923 K and 898 K (650°C and 625°C).
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