科研之友
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摘要
To investigate the formation and evolution mechanism of inclusions in high-Al steel, four lab-scaled experiments are carried out with different calcium (Ca) contents. The Al2O3 inclusions are modified to (CaO-Al2O3)-CaS after Ca addition. With the Ca content increased, the types of CAx-CaS inclusions are changed from CaS-attached inclusions to CAx-wrapped inclusions. When the total calcium content (T.Ca) reached 29 ppm, the CAx-CaS inclusions are primarily distributed within the 50% liquidus in CaO-Al2O3-CaS ternary diagram. Some Al2O3 inclusions are not completely modified with 7 ppm Ca addition. CaS and CaO-CaS inclusions are observed with a higher Ca addition. The modification of Al2O3 by CaS and [Ca] occurs in CaS-attached inclusions with a lower Ca addition. To clarify the formation of CaS, a new modification index for high-Al steel is given based on the T.Ca/T.O index. @@@ The evolution mechanism of inclusions treated by calcium (Ca) in high-Al steel is investigated. The Al2O3 inclusions are modified to (CaO-Al2O3)-CaS after Ca addition. Ca treatment leads to two types of (CaO-Al2O3)-CaS inclusions. Based on the total calcium content/total oxygen content, a new modification index is given to clarify the formation of CaS inclusion.
