The second objective of the present work was to improve the workability
of α-matrix-based high Al steel. According to literature, lamellar structure can be spheroidized [25] and refined [26] by electric current
processing (electropulsing). Electropulsing has also been implemented
to alternate the volume fraction of precipitate [27–28]. The annealed
Fe-26Mn-9Al-0.75C samples were subjected to an electric current
pulse with peak current density of 1.92 × 109 A·m−2
. The pulse was
generated by discharge a capacitor at room temperature. The capacitor
was charged at 2.5 kv. Pulse is in the damped shape oscillations with initial
period around 20 μs and total duration of 110 μs. One pulse was applied
to each sample. The microstructure of the electropulsed samples
was characterized using the same methods as that described in
Section 2. The formability was testified by cold rolling to 70% reduction.
The observations were compared to that of the samples without
electropulsing treatment