The precipitation of σ-phase in the cold rolled specimens of an Fe–10Cr–30Mn steel was investigated by transmission electron microscopy after aging at 923 K. The specimens were prepared as a reduced activation austenitic steel for fusion reactor structures. During the aging, recrystallisation and discontinuous precipitation of σ-phase occurred simultaneously in the specimens with > 30% cold working (CW). The recrystallising interfaces moved toward the deformed and supersaturated solid solutions, leaving the precipitates of σ-phase behind the new recrystallised grains. The nucleation and growth behaviour of σ-phase is discussed.
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