Transient Evolution of Nonmetallic Inclusions During Calcium Treatment of Molten Steel LIFENG ZHANG, YANG LIU, YING ZHANG, WEN YANG, and WEI CHEN The transient evolution of nonmetallic inclusions after calcium addition in pipeline steels was investigated with a vacuum induction furnace. Samples were taken at 1, 5, 10, 15, and 20 minutes after calcium treatment in both MgO and Al O crucibles. It was found that the total 2 3 oxygen and the number density of inclusions were increased during calcium modiﬁcation, while they were dropped to a low level in the last tapped sample. Due to the evaporation of calcium, inclusions were transferred from CaO-CaS to Al O -CaO-CaS, and then to Al O -CaO. The 2 3 2 3 decomposition of CaS was highly dependent on the decrease of the total calcium and the increase of the total oxygen in the steel. Thermodynamic calculation was performed to predict the composition of inclusions considering the eﬀect of the total oxygen and the total calcium and was validated by measurement. The relationship between the content of Al O in inclusions 2 3 and the ratio of the total calcium and the total oxygen in steels was measured and compared
Metallurgical and Materials Transactions B – Springer Journals
Published: Jun 4, 2018
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