  Achieving desired properties in bainite steels with MA islands demands
understanding the affect of processing conditions and composition on their size
and morphology. Generally, this understanding is gained by studying the change
in the size and morphology of the MA islands with composition and the
processing conditions. In the present work, around 8500 MA islands dispersed
across of approximately 1500 bainite microstructures are investigated to
comprehend the influence of composition and heat treatment cycle on the
geometric features. The geometric features considered in this study include
polygon area metric, compactness and aspect ratio. A thorough statistical
analysis of these features across bainite steels of different compositions and
processing conditions unravel that, though there are minor changes, no
characteristic variation is introduced in the size and morphology of the MA
islands. In other words, the distribution of the various forms of MA islands
are almost identical in bainite steels of different chemistry and heat
treatment, thereby indicating the inadequacy of geometric features in
explicating the affect of processing conditions on microstructure.
