Characteristics of Al2O3, MnS, and TiN inclusions in the remelting process of bearing steel

The Al2O3, MnS, and TiN inclusions in bearing steel will deteriorate the steel’s mechanical properties. Therefore, elucidating detailed characteristics of these inclusions in consumable electrode during the electroslag remelting process is important for achieving a subsequently clean ingot. In this...

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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2017-08, Vol.24 (8), p.869-875
Main Authors: Yang, Liang, Cheng, Guo-guang
Format: Article
Language:English
Subjects:
Aluminum oxide
Bearing steels
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composites
Corrosion and Coatings
Dissolution
Electroslag remelting
Glass
High temperature
Inclusions
Liquid alloys
Materials Science
Mechanical properties
Melting
Metallic Materials
Natural Materials
Solidus
Steel
Surfaces and Interfaces
Temperature
Thin Films
Tribology
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Summary:The Al2O3, MnS, and TiN inclusions in bearing steel will deteriorate the steel’s mechanical properties. Therefore, elucidating detailed characteristics of these inclusions in consumable electrode during the electroslag remelting process is important for achieving a subsequently clean ingot. In this study, a confocal scanning violet laser microscope was used to simulate the remelting process and observe, in real time, the behaviors of inclusions. The obtained images show that, after the temperature exceeded the steel solidus temperature, MnS and TiN inclusions in the specimen began to dissolve. Higher temperatures led to faster dissolution, and the inclusions disappeared before the steel was fully liquid. In the case of an observed Al2O3 inclusion, its shape changed from angular to a smooth ellipsoid in the region where the solid and liquid coexisted and it began to dissolve as the temperature continued to increase. This dissolution was driven by the difference in oxygen potential between the inclusion and the liquid steel.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-017-1472-8