Microstructural characterization in a hot-rolled, two-phase steel

Orientation Imaging Microscopy allows characterization of the crystallographic orientation of grains in a polycrystal. Consequently, it permits one to define the grain boundary nature in each phase and between the phases when the studied material is a dual-phase material such as an austeno-ferritic steel. Moreover, as is shown in the present paper, this technique allows a good estimation of the surface fraction of each phase and their variation along the radius of a rod that comes from a “round–oval” groove sequence.