2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 1: D'Abreu Intl. Symp. / Iron and Steel Making

Editors:Kongoli F, Noldin JH, Takano C, Lins F, Gomez Marroquin MC, Contrucci M
Publisher:Flogen Star OUTREACH
Publication Year:2016
Pages:320 pages
ISBN:978-1-987820-37-9
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
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    Characteristics and origins of oxide inclusions in bearing steel used for high-power wind turbines during different process

    Yang Li1; ZhengLiang Xue2; Jinlin Cai3; Xiao Aiping4; Xu Shangchen4; Liu Yueyun4;
    1WUHAN UNIVERSITY OF SCIENCE AND TECHNOLOGY, Wuhan, China; 2THE STATE KEY LABORATORY OF REFRACTORIES AND METALLURGY, WUHAN UNIVERSITY OF SCIENCE AND TECHNOLOGY, WuHan, China; 3THE STATE KEY LABORATORY OF REFRACTORIES AND METALLURGY, WUHAN UNIVERSITY OF SCIENCE AND TECHNOLOGY, Wuhan, China; 4RESEARCH AND DEVELOPMENT CENTER OF DAYE SPECIAL STEEL CO.,LTD., Huangshi, China;
    Type of Paper: Regular
    Id Paper: 82
    Topic: 2

    Abstract:

    The characterization of nonmetallic inclusions is very important for the production of bearings in order to improve the mechanical properties and service life. It's worth mentioning that large-scale oxide inclusions, such as aluminium oxide or calcium-aluminate, significantly influenced the fatigue life of bearing steel. Nonaqueous solution electrolysis method was employed to extract the non-metallic inclusions of bearing steel used for high-power wind turbines during electric steelmaking, refining, and rolling processes. By means of SEM and EDS, the morphology, size, composition, and type of the extracted inclusions were characterized and the possible sources of those inclusions were analyzed accordingly. The results show that oxide inclusions in this bearing steel are mainly composed of Al-Ca-Si-Mg system oxides. Additionally, these oxide inclusions, such as Al2O3-CaO-MgO-SiO2、Al2O3-CaO-SiO2、Al2O3-SiO2、SiO2, existed in all samples, of which morphology, quantity, and composition changed in different processes. Even though the T[O] content in the rolled products is only 0.0007%, there still exists a certain amount of SiO2-rich Al-Ca-Si-Mg system macro inclusions.

    Keywords:

    bearing steel for wind turbine; oxide inclusion; nonaqueous solution electrolysis; Al-Ca-Si-Mg system

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    Cite this article as:

    Li Y, Xue Z, Cai J, Aiping X, Shangchen X, Yueyun L. Characteristics and origins of oxide inclusions in bearing steel used for high-power wind turbines during different process. In: Kongoli F, Noldin JH, Takano C, Lins F, Gomez Marroquin MC, Contrucci M, editors. Sustainable Industrial Processing Summit SIPS 2016 Volume 1: D'Abreu Intl. Symp. / Iron and Steel Making. Volume 1. Montreal(Canada): FLOGEN Star Outreach. 2016. p. 67-82.