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| Relationship between high frequency defect detection and inclusions in GCr15 bearing steel |
| XIE Wen-xin1,3， BAO Yan-ping1， WANG Min1,2， ZHANG Xu-dong3 |
1. State Key Laboratory of Advanced Metallurgy， University of Science and Technology Beijing， Beijing 100083，China
2. Jiangyin Xingchen Special Steel Works Co.， Ltd.， Jiangyin 214400， Jiangsu，China
3. National Engineering Research Center of Flat Rolling Equipment， University of Science and Technology Beijing， Beijing 100083， China |
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Abstract The formation reasons of defects in high-frequency detection of bearing steel (GCr15) were analyzed systematically， by tracking the source and evolution of inclusions associated with defects in different locations using ASPEX automatic scanning electron microscope. The results showed that， large MgO-Al2O3 inclusions existing in steel matrix resulted in the defects. Most of MgO-Al2O3 inclusions are produced in ladle furnace (LF) and tundish locations; the removal rate of MgO-Al2O3 inclusions reached 93.1 percent during vacuum degassing furnace (VD) process. Erosion of tundish refractory reduced significantly and the qualified rate of defect detection of GCr15 bearing steel of enhanced from 79% to 98% by improving the volume density and compressive strength of refractory， and reducing content of MgO and SiO2 in tundish refractory.
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Received: 15 April 2014
Published: 18 March 2015
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Johansson T L, Lund T B. A review of Swedish bearing steel manufacturing and quality assurance of steel products[J]. Journal of ASTM International, 2006, 3(10):3-15.[ ] Yoshiyuki K, Tsutomu M, Kiyoshi K et al. Recent improvements in cleanliness in high carbon chromium bearing steel. ISIJ Int., 1996, 36: S89-S92.[ ] Li Tao, Ma Yongqiang, Cai Qing et al. Cause and control on unqualified UT of large-size high-carbon high-chromium bearing steel ring. Hot Working Technology, 2013, 42(11):230-231.（李涛，马永强，蔡青等. 大型高碳铬轴承钢环节探伤不合格成因与控制. 热加工工艺，2013,42（11）：230-231.）[ ]Yang Shufeng, Li Jinshe, Zhu Liguang et al. Status quo of research on MgAl2O4 spinel inclusion in steel and trend of its development. Steelmaking, 2010, 26(1): 74-78.(杨树峰，李京社，朱立光，陈永峰，张立峰，Kent Peaslee. 钢中镁铝尖晶石夹杂物研究现状及发展. 炼钢，2010,26（1）：74-78.)[ ]Li Yongde, Guo Weimin, Xu Na et al. Fatigue crack growth behavior in GBF area of SUJ2 bearing steel in very high cycle regime[J]. Transactions of materials and heat treatment, 2014, 35(1):49-54.(.李永德，郭卫民，徐娜 等. SUJ2轴承钢超声疲劳GBF内裂纹扩展规律. 材料热处理学报. 2014,35(1): 49-54.)[ ]Fu Jie, Wang Pin, Xu Junhao and Zhou Deguang. Effect and control of minor elements – oxygen, nitrogen, titanium and calcium in bearing steel[J]. Special Steel, 1998, 19(6): 31-34.（付杰，王平，徐君浩，周德光. 轴承钢中微量元素氧-氮-钛-钙的作用与控制. 特殊钢，1998,19（6）：31-34.）
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2015, Vol. 50 
