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

doi:10.1007/s40436-019-00266-1

Advances in Manufacturing ›› 2019, Vol. 7 ›› Issue (4): 438-447.doi: 10.1007/s40436-019-00266-1

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

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

State Key Laboratory of Advanced Special Steel and Shanghai Key Laboratory of Advanced Ferrometallurgy and School of Materials Science and Engineering, Shanghai University, Shanghai 200444, People's Republic of China

收稿日期:2019-01-22 修回日期:2019-05-08 出版日期:2019-12-25 发布日期:2019-12-26
通讯作者: Shu-Qiang Guo E-mail:sqguo@shu.edu.cn
基金资助:
This study was financially supported by the Shanghai University and the Joint Funds of the National Natural Science Foundation of China (Grant No. U1560202).

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

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

State Key Laboratory of Advanced Special Steel and Shanghai Key Laboratory of Advanced Ferrometallurgy and School of Materials Science and Engineering, Shanghai University, Shanghai 200444, People's Republic of China

Received:2019-01-22 Revised:2019-05-08 Online:2019-12-25 Published:2019-12-26
Contact: Shu-Qiang Guo E-mail:sqguo@shu.edu.cn
Supported by:
This study was financially supported by the Shanghai University and the Joint Funds of the National Natural Science Foundation of China (Grant No. U1560202).

摘要/Abstract

摘要： 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 semiplastic liquid phase calcium aluminates. The experimental results matched well with the thermodynamic analysis.

The full text can be downloaded at https://link.springer.com/article/10.1007/s40436-019-00266-1

关键词: GCr18Mo bearing steel, Ca treatment, Inclusion modification, Deoxidization, Thermodynamics

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 semiplastic liquid phase calcium aluminates. The experimental results matched well with the thermodynamic analysis.

The full text can be downloaded at https://link.springer.com/article/10.1007/s40436-019-00266-1

Key words: GCr18Mo bearing steel, Ca treatment, Inclusion modification, Deoxidization, Thermodynamics

Hong-Yan Zheng, Shu-Qiang Guo, Meng-Ran Qiao, Li-Bin Qin, Xiu-Jing Zou, Zhong-Ming Ren. Study on the modification of inclusions by Ca treatment in GCr18Mo bearing steel[J]. Advances in Manufacturing, 2019, 7(4): 438-447.

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

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

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