Transient Evolution of Nonmetallic Inclusions During Calcium Treatment of Molten Steel

Transient Evolution of Nonmetallic Inclusions During Calcium Treatment of Molten Steel 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 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Metallurgical and Materials Transactions B Springer Journals

Transient Evolution of Nonmetallic Inclusions During Calcium Treatment of Molten Steel

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Publisher
Springer Journals
Copyright
Copyright © 2018 by The Minerals, Metals & Materials Society and ASM International
Subject
Materials Science; Metallic Materials; Characterization and Evaluation of Materials; Structural Materials; Surfaces and Interfaces, Thin Films; Nanotechnology
ISSN
1073-5615
eISSN
1543-1916
D.O.I.
10.1007/s11663-018-1289-5
Publisher site
See Article on Publisher Site

Abstract

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

Journal

Metallurgical and Materials Transactions BSpringer Journals

Published: Jun 4, 2018

References

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