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Advances in Manufacturing
Published in: Advances in Manufacturing 4/2019

14-08-2019

Study on the modification of inclusions by Ca treatment in GCr18Mo bearing steel

Authors: Hong-Yan Zheng, Shu-Qiang Guo, Meng-Ran Qiao, Li-Bin Qin, Xiu-Jing Zou, Zhong-Ming Ren

Published in: Advances in Manufacturing | Issue 4/2019

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Abstract

The effect of Ca treatment on the modification of inclusions in Al-killed GCr18Mo bearing steel was studied and a thermodynamic and kinetic model was established. The experimental results showed that oxygen content in the steel could be reduced from 120 μg/g to the range 5.5–21.6 μg/g by Al-Ca complex deoxidization at 1 873 K. An appropriate increase in Ca/Al mass ratio is beneficial to reduce the total oxygen content in steel. When the content of dissolved aluminum was in the range of 0.03%–0.3%, with the increase of Ca/Al mass ratio from 0.8–1.6 to 2.4–3.2, the number of inclusions per unit area significantly reduced. In addition, the main types of inclusions were modified from large-sized Al2O3 clusters to plastic or semi-plastic liquid phase calcium aluminates. The experimental results matched well with the thermodynamic analysis.
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Metadata
Title
Study on the modification of inclusions by Ca treatment in GCr18Mo bearing steel
Authors
Hong-Yan Zheng
Shu-Qiang Guo
Meng-Ran Qiao
Li-Bin Qin
Xiu-Jing Zou
Zhong-Ming Ren
Publication date
14-08-2019
Publisher
Shanghai University
Published in
Advances in Manufacturing / Issue 4/2019
Print ISSN: 2095-3127
Electronic ISSN: 2195-3597
DOI
https://doi.org/10.1007/s40436-019-00266-1

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