Abstract
The behavior and formation mechanisms of inclusions in Ti-stabilized, 17Cr Austenitic Stainless Steel produced by the ingot casting route were investigated through systematic sampling of liquid steel and rolled products. Analysis methods included total oxygen and nitrogen contents, optical microscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The results indicate that the composition of inclusions was strongly dependent on the types of added alloying agents. During the AOD refining process, after the addition of ferrosilicon alloy and electrolytic manganese, followed by aluminum, the composition of inclusions changed from manganese silicate-rich inclusions to alumina-rich inclusions. After tapping and titanium wire feeding, pure TiN particles and complex inclusions with Al2O3-MgO-TiO x cores containing TiN were found to be the dominant inclusions when [pct Ti] was 0.307 mass pct in the molten steel. These findings were confirmed by thermodynamic calculations which indicated that there was a driving force for TiN inclusions to be formed in the liquid phase due to the high contents of [Ti] and [N] in the molten steel. From the start of casting through to the rolled bar, there was no further change in the composition of inclusions compared to the titanium addition stage. Stringer-shaped TiN inclusions were observed in the rolled bar. These inclusions were elongated along the rolling direction with lengths varying from 17 to 84 µm and could have a detrimental impact on the corrosion resistance as well as the mechanical properties of the stainless steel products.
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Acknowledgments
Acknowledgments are expressed to the China Scholarship Council (CSC) for financial support of this study, to Ruipu Technology for providing samples of stainless steel and to the Natural Sciences and Engineering Research Council of Canada for support of steel-related research at the University of Toronto.
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Manuscript submitted June 24, 2015.
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Yin, X., Sun, Y., Yang, Y. et al. Formation of Inclusions in Ti-Stabilized 17Cr Austenitic Stainless Steel. Metall Mater Trans B 47, 3274–3284 (2016). https://doi.org/10.1007/s11663-016-0681-2
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DOI: https://doi.org/10.1007/s11663-016-0681-2