Abstract
This paper investigated the microstructure evolution of cold-rolled Fe-30Mn-9Al-1C steel at various heat treatment temperatures and found that the β-Mn phase could rapidly precipitate at moderate temperatures. A method of quasi in situ observation was used to observe the precipitation of the intergranular and intragranular β-Mn phase. A transmission electron microscopy analysis showed that the transition band can act as a rapid precipitation passage of the β-Mn phase. Intragranular κ-carbides caused the β-Mn phase to precipitate without the formation of the α-ferrite phase. The precipitation reaction, $$ \gamma \mathop \to \limits^{\kappa } \beta{\text{-Mn}} + \gamma^{\prime } $$, was verified by estimating the Gibbs free energy change to − 46741 J/mol according to the Fe-Mn-Al-C quaternary thermodynamics model. The strain storage energy at the deformation band boundaries can be up to 55% according to the kinetics calculation, which supported the priority of the transition band in the rapid precipitation of the β-Mn phase.
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