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Metallurgical and Materials Transactions B
Published in: Metallurgical and Materials Transactions B 4/2012

01-08-2012

Formation and Modification of MgO·Al2O3-Based Inclusions in Alloy Steels

Authors: Shufeng Yang, Qiangqiang Wang, Lifeng Zhang, Jingshe Li, Kent Peaslee

Published in: Metallurgical and Materials Transactions B | Issue 4/2012

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Abstract

The current study performed thermadynamic calculation, laboratory experiments, and industrial trials for the formation and modification of MgO-Al2O3 spinel inclusions in alloy steels. The stability Mg-Al-O diagram was obtained using the thermodymanic study. The resulting MgO-Al2O3-CaO inclusions from MgO-Al2O3 spinel inclusions after the calcium treatment were spherical, and > 5 μm MgO-Al2O3-CaO inclusions have a two-layer structure: an outside CaO-Al2O3 layer and a MgO-Al2O3 core. The modification of > 5 μm MgO·Al2O3 spinel inclusions by calcium treatment includes two steps: (1) reducing MgO in the inclusion into the dissolved magnesium by the dissolved calcium in the steel and (2) generating a liquid xCaO·yAl2O3 layer at the outside of the spinel inclusion. For <2 μm MgO·Al2O3 spinel inclusions, they can possibly be modified into a xCaO·yAl2O3 inclusion by reducing all MgO component in the spinel inclusions with the added calcium.
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Metadata
Title
Formation and Modification of MgO·Al2O3-Based Inclusions in Alloy Steels
Authors
Shufeng Yang
Qiangqiang Wang
Lifeng Zhang
Jingshe Li
Kent Peaslee
Publication date
01-08-2012
Publisher
Springer US
Published in
Metallurgical and Materials Transactions B / Issue 4/2012
Print ISSN: 1073-5615
Electronic ISSN: 1543-1916
DOI
https://doi.org/10.1007/s11663-012-9663-1

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