We have investigated the phase transformations of quaternary Fe–C–Mn–Al alloys subjected to various heat treatments, for example, cooling from high temperatures [14], [15], [16], [17] and [18] and holding isothermally at low temperatures [19], [20], [21] and [22]. Some preliminary results have been acquired. For example, another pearlite with lamellae of ferrite and M23C6 carbide, called M23C6 pearlite, has been found in Fe–C–Mn–Al steels. Instead of M3C plates, M23C6 sheets embed in the ferrite of the M23C6 pearlite [19] and [20]. However, we found some phase transformations of the quaternary Fe–C–Mn–Al alloys are extended from the ternary Fe–C–Mn alloys. Therefore, we have further studied the phase transformations of high Mn steels to verify the origin of the phase transformations of the quaternary Fe–C–Mn-Al alloys. For example, we discovered that the FCC micro-twins occur along with HCP ε-martensite in Fe–C–Mn alloys after cooling from high temperature [18]. The following are some interesting findings concerning high Mn steel after isothermal holding at low temperatures.
We have investigated the phase transformations of quaternary Fe–C–Mn–Al alloys subjected to various heat treatments, for example, cooling from high temperatures [14], [15], [16], [17] and [18] and holding isothermally at low temperatures [19], [20], [21] and [22]. Some preliminary results have been acquired. For example, another pearlite with lamellae of ferrite and M23C6 carbide, called M23C6 pearlite, has been found in Fe–C–Mn–Al steels. Instead of M3C plates, M23C6 sheets embed in the ferrite of the M23C6 pearlite [19] and [20]. However, we found some phase transformations of the quaternary Fe–C–Mn–Al alloys are extended from the ternary Fe–C–Mn alloys. Therefore, we have further studied the phase transformations of high Mn steels to verify the origin of the phase transformations of the quaternary Fe–C–Mn-Al alloys. For example, we discovered that the FCC micro-twins occur along with HCP ε-martensite in Fe–C–Mn alloys after cooling from high temperature [18]. The following are some interesting findings concerning high Mn steel after isothermal holding at low temperatures.
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