Characterization of 2D and 3D morphology of Al 2 O 3 inclusion in hot rolled ultra-low carbon steel sheets

Abstract

In this work, the two-dimensional (2D) morphology of Al₂O₃ inclusions with oval and polygon was observed. The non-aqueous electrolysis extraction method was employed for extraction and characterization of the real three-dimensional (3D) morphology and size of inclusions in hot rolled ultra-low carbon steel sheets. The integrated morphology and size of Al₂O₃ inclusion were obtained through scanning electron microscopy along with an energy-dispersive spectrometer. Compared with 3D morphology and size of Al₂O₃ inclusions, the 2D morphology and size are hardly accurate to describe the real morphology and size. Additionally, the mechanical property of Al₂O₃ inclusion and steel matrices were tested by nano-indentation. The real morphology, size and mechanical properties of Al₂O₃ inclusions will help to establish, develop and validate the damage model or criteria, as well as to improve the quality of rolled productions.

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