Nanostructured Fe-Ni-Mn steel was prepared by heavy cold rolling and isothermal aging of lath martensite. Kikuchi patterns obtained by convergent-beam electron diffraction analysis was used to study the statistics of misorientation across grain boundaries. It was found out that high fraction of grain boundaries are high angle. However, low angle boundaries were also indicated frequently. The evolution of the misorientation statistics was studied during isothermal aging to outline the mechanism of ultrafine grain formation. It is found out that the statistics of misorientation is unlikely to substantially change with aging time. Following that, it is assumed random nucleation of new grains is unlikely to occur during aging and, subsequently, ultrafine grains along with misorientation statistics are inherited from deformed structure.

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1. Determination of dislocation density and crystallite size distribution in deformed lath martensite by X-ray peak profile analysis
2. Evolution of precipitate coarsening reaction in a nanostructured Fe-Ni-Mn maraging alloy
3. High resolution transmission electron microscopy study on the nano-scale twining of θ-NiMn precipitates in Fe-Ni-Mn maraging alloy