Abstract
The development of the high-end manufacturing industry is largely dependent on the quality of free-cutting steel. In particular, the characteristic of MnS inclusions is a key issue in the improvement of the quality of high-quality free-cutting steel. Previous studies on the mechanism of morphological evolution of MnS inclusions have mainly focused on two-dimensional qualitative observation and trend analysis. In this study, the morphology of MnS inclusions in steel was observed using Micro-CT. The stereology, dimensions, and morphology of MnS inclusions were characterized in detail to investigate the anisotropy and morphology evolution of inclusions during the rolling of steel samples. An anisotropy index was proposed based on the statistical analysis of the dimensional ratios of the MnS inclusions to quantitatively describe the anisotropy of inclusions in the steel sample. This index could potentially be applied to the quantification of the anisotropy of MnS inclusions in steel products. The shape factor, φ, was defined to quantitatively investigate the 3D morphology of MnS inclusions, based on their morphology evolution during rolling. In addition, the heredity during rolling was discussed based on the visualization of a series of typical MnS inclusions before and after rolling.
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