Effect of Ce/Mg addition on the cleanliness of M50-bearing steel

被引：0
作者：
Wang L.-C. [1 ]
Tian J.-L. [1 ]
Ren J. [1 ]
Jiang C.-G. [1 ]
You Z.-M. [1 ]
Jiang Z.-H. [1 ,2 ]
机构：
[1] School of Metallurgy, Northeastern University, Shenyang
[2] State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang
来源：
Gongcheng Kexue Xuebao/Chinese Journal of Engineering | 2022年 / 44卷 / 09期
关键词：
aerospace-bearing steel; Ce–Mg synergistic treatment; cleanliness; inclusion; refractory; thermodynamics;
D O I：
10.13374/j.issn2095-9389.2022.01.15.001
中图分类号：
学科分类号：
摘要：
The cleanliness level and nonmetallic inclusion distribution characteristics of M50 aerospace-bearing steel are key factors affecting its quality and service life. The simultaneous addition of Ce–Mg has been proposed in this paper as an innovation to improve cleanliness dramatically. Based on the thermodynamic calculation, the underlying functional mechanism has been revealed. Additionally, the effects of Ce, Mg, and Ce–Mg simultaneous additions on oxygen content, sulfur content, and inclusion distribution characteristics have been analyzed comparatively. The vacuum induction melting process was used to prepare the M50 aerospace-bearing steel ingots. The chemical compositions of experimental steels were acquired using inductively coupled plasma-atomic spectroscopy, Leco TC500 N2/O2 analyzer, CS-3000 carbon/sulfur analyzer, and SPECTROLAB M11 stationary metal analyzer. The statistical distribution characteristics of inclusions were obtained using the image processing software based on optical microscopy images. The composition and morphology of inclusions have been characterized using scanning electron microscopy equipped with energy dispersive spectroscopy. The results indicated that Ce could significantly enhance the efficiency of deoxidation and desulfurization. Preferentially, Ce addition would lead to the formation of Ce2O2S inclusions in the steel. As the oxygen content in liquid steel decreases, Ce could also react with As to form a compound, and this could further purify the molten steel since As has generally been recognized as a harmful element. Meanwhile, Ce would also react with the magnesia–aluminum spinel refractory and cause an increase in the number density of inclusions in the steel. Thus, in comparison to the Ce-treated steel with higher Ce content, the smallest size and number of inclusions have been obtained in the steel with a total Ce mass fraction of 0.018%. In addition to deoxidation and desulfurization, Mg addition could also inhibit the reaction between Ce and magnesia –aluminum spinel refractories. The thermodynamic calculation results demonstrated that the dissolved [Ce] in the molten steel could react with the magnesia–aluminum spinel refractory material, resulting in an increase in the concentration of [O] and [Al] in the molten steel, while this reaction could significantly be inhibited by the dissolved [Mg] in the molten steel. In summary, Ce–Mg synergistic treatment could significantly decrease the number and size of inclusions in the steel. Based on this novel technology, the ultraclean M50 aerospace-bearing steel with an oxygen mass fraction of 0.00075% has successfully been obtained. This work has opened a new insight into the deoxidation mechanism of Ce–Mg synergistic treatment and provided a novel method to further improve the cleanliness of molten steel during the vacuum induction melting process. © 2022 Science Press. All rights reserved.
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页码：1507 / 1515
页数：8
相关论文
共 28 条
  • [1] Li Z K, Lei J Z, Xu H F, Et al., Current status and development trend of bearing steel in China and abroad, J Iron Steel Res, 28, 3, (2016)
  • [2] Liu Y Z, Zhou L Y, Zhang C L, Et al., Development and quality control of bearing steel for heavy equipment, Iron Steel, 48, 8, (2013)
  • [3] Jiang S F, Wang X L, Yuan Y T., Characteristics and application technology of precision machine tool bearings, Bearing, 7, (2011)
  • [4] Ye J., The localization of high-speed railway bearings is now dawning, Machinery, 52, 6, (2014)
  • [5] Li H W, Zhang B L, Chen L., Interview of academician Zhao Zhenye, Aeroengine, 35, 3, (2009)
  • [6] Yong Q L, Dong H, Liu Z D, Et al., Recent progress in advanced machinery structure steels, Heat Treat Met, 35, 1, (2010)
  • [7] Li X, Jiang Z H, Geng X, Et al., Evolution mechanism of inclusions in H13 steel with rare earth magnesium alloy addition, ISIJ Int, 59, 9, (2019)
  • [8] Liu Y Q, Wang L J, Chou K., Effect of cerium on the cleanliness of spring steel used in fastener of high-speed railway, J Rare Earths, 32, 8, (2014)
  • [9] Kwon S K, Kong Y M, Park J H., Effect of Al deoxidation on the formation behavior of inclusions in Ce-added stainless steel melts, Met Mater Int, 20, 5, (2014)
  • [10] Karasev A, Suito H., Analysis of size distributions of primary oxide inclusions in Fe–10 mass Pct Ni-M (M=Si, Ti, Al, Zr, and Ce) alloy, Metall Mater Trans B, 30, 2, (1999)
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