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Electron backscatter diffraction (EBSD) analysis has been presented to investigate the microstructure and microtexture evolutions of deformed oxide scale formed on a microalloyed steel during hot rolling and accelerated cooling. Magnetite and wustite in oxide layers share a strong {0 0 1} and a weak {1 1 0} fibres texture parallel to the oxide growth. Trigonal hematite develops the {0 0 0 1} basal fibre parallel to the crystallographic plane {1 1 1} in magnetite. Taylor factor estimates have been conducted to elucidate the microtexture evolution. The fine-grained magnetite seam adjacent to the substrate is governed by stress relief and ions vacancy diffusion mechanism. [ABSTRACT FROM AUTHOR]

Highlights: [•] The oxidation behaviour of the Nb–V–Ti microalloyed steel is investigated. [•] The coarse-grained steel substrate has detrimental effect on adhesion properties. [•] High magnetite content is attributed to grain-boundary oxidation above 570°C. [•] Grain refinement mechanism is proposed to generate the tight oxide scale. [ABSTRACT FROM AUTHOR]