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Modification of Inclusions in ESR Bearing Steel

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Journal of Iron and Steel Research International 1998年第1期5卷 34-37页

作者： li zhengbang Zhang Jiawen li Ying Wang Changsheng Central Iron and Steel Research Institute MMI Daye Special Steel Corporation Ltd.

Electroslag remelting (ESR) process using consumable electrode deoxidized with Ca-Si and Fe-Si instead of Al, and acid slag (CaF_2SiO_2Al_2O_3CaO) instead of universal slag ANF_6(CaF_2. 70 %+A1_2O_3.30 %) could change brittle inclusion (alumina) to ductile inclusion (silicate) in remelted steel. Fatigue life of bearing steel could be increased significantly in this way.

关键词： deoxidant acid slag ESR inclusion bearing steel

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Investigation of the Service Properties of the Electroslag Cast Metal

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Journal of Iron and Steel Research International 1998年第2期5卷 17-23页

作者： li zhengbang Zhang Jiawen lin Gongwen Central Fron&Steel Research Institute MMIBeijing(100081)China

The electroslag cast metal features its cleanness,sound structure,consistent composition,smooth surface,high metal yield,excellent mechanical properties and service *** advantages have been applied to turbine discs,ai... 详细信息

关键词： electroslag casting service properties

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Magnetic microstructure and coercivity mechanism of high performance Nd-Fe-B magnets

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Rare Metals 2006年第Z1期25卷 630-632页

作者： ZHU Minggang liU Xingmin FANG Yikun li zhengbang li Wei Central Iron & Steel Research Institute Beijing 100081 China Central Iron & Steel Research Institute Beijing 100081 China Central Iron & Steel Research Institute Beijing 100081 China Central Iron & Steel Research Institute Beijing 100081 China Central Iron & Steel Research Institute Beijing 100081 China

Magnetic microstructure of high performance Nd-Fe-B magnets was investigated by using magnetic force microscopy. The correlation between magnetic microstructure and coercivity for high performance Nd-Fe-B magnets was studied. It is found that the magnets with different coercivity mechanism take on different microstructures and magnetism. Moreover, the magnetic microstructures of high performance permanent magnets can be explained by the starting field theory model.

关键词： Nd-Fe-B permanent magnets magnetic domains reversal of magnetism starting field theory

Study on Factors Affecting the Structure of High Speed Steel Ingot Produced by ESR

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Journal of Iron and Steel Research International 1996年第1期3卷 1-4页

作者： li zhengbang Che Xiangqian Central Iron and Steel Research Institute MMI

The influence of the metal pool depth and the local solidification time on the structure of high speed steel ingot produced by electroslag remelting (ESR) process has been studied by measuring the dendritic arm spacing and the size of the carbides. It is shown that the metal pool depth is a factor that influences the uniformity of the ESR ingot structure and not only the dendritic arm spacing, but also the size of the carbides can be influenced by the local solidification time in the solidification process of the ingot. The relationship between the melting rate during ESR process and the local solidification time has been studied. It is shown that there is an optimum melting rate at which the local solidification time is minimum as a result of the combination of the influence of the melt rate on the width of the local mushy zone and on the local solidification rate. The influence of the inoculants on the solidification structure of high speed steel produced by ESR has been studied and it is shown that the size of the grain can be significantly reduced by inoculation process.

关键词： high speed steel electroslag remelting carbide network ledeburite size inoculant

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MAXIMUM TEST FOR A SEQUENCE OF QUADRATIC FORM STATISTICS ABOUT SCORE TEST IN LOGISTIC REGRESSION MODEL

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Acta Mathematica Scientia 2020年第2期40卷 543-556页

作者： Qing YANG Jiayan ZHU zhengbang li School of Mathematics and Statistics South-Central University for NationalitiesWuhan 430074China School of Information Engineering Hubei University of Chinese MedicineWuhan 430065China School of Mathematics and Statistics&Hubei Key Laboratory of Mathematical Sciences Central China Normal UniversityWuhan 430079China

This article proposes the maximum test for a sequence of quadratic form statistics about score test in logistic regression model which can be applied to genetic and medicine *** properties about the maximum test are *** simulation studies are conducted to testify powers robustness of the maximum test compared to other two existed *** also apply the maximum test to a real dataset about multiple gene variables association analysis.

关键词： Maximum test quadratic form statistics score test asymptotic statistical property

Microstructure and optical properties of sprayed γ-CuI thin films for CuInS_2 solar cells

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Rare Metals 2011年第1期30卷 22-27页

作者： YAN Youhua ZHOU Shaoxiong LU Zhichao li zhengbang Advanced Technology ＆ Materials Co.Ltd. China Iron ＆ Steel Research Institute GroupBeijing 100081China

γ-CuI thin films were prepared by a spraying method using acetonitrile as a solvent,CuI and iodine as *** influences of substrate temperature on the structure,topography,and optical properties of CuI films were *** electron microscope（SEM） photos revealed that the shape and grain size of CuI grains were related to substrate temperature.X-ray diffraction results showed that substrate temperature affected the crystalline quality of CuI *** the substrate temperature was 110°C,CuI thin films showed γ-phase zinkblende structure with（111） preferred *** dimension of the globular CuI crystallite was approximately 35 nm,the energy band gap was 2.97 eV,the maximum transmittance was 87.3% in the part of the visible region,and the open circuit voltage was close to 380 *** opened a route for a cadmium-free buffer layer for CuInS2 solar cells.

关键词： solar cells thin films spraying microstructure optical properties

The influence of clusters in the melt of Fe80Si10B10 alloy on the subsequent glass-formation

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Progress in Natural Science:Materials International 2013年第2期23卷 216-219页

作者： Bangshao Dong Shaoxiong Zhou Jingyu Qin Shaopeng Pan zhengbang li China Iron & Steel Research Institute Group Advanced Technology & Materials Co. Ltd. Key Laboratory for liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education) Shandong University China Iron & Steel Research Institute Group

The structure of Fe80Si10B10 alloy melt was investigated by ab initio molecular dynamic simulation from the local atomic environments. It presents that Fe80Si10B10 alloy can be considered as the combination of B-centered prism-like clusters and bcc-like Fe-Si solid solution. The poor glass-forming ability of the alloy has been investigated and can be attributed to the bcc-like environment around Si atoms and the relative high content of pure Fe clusters.

关键词： Metallic glasses Alloy melt Clusters liquid structure Glass-forming ability

Development of electroslag metallurgy and casting in China

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China Foundry 2004年第1期1卷 7-16页

作者： zhengbang li Central Iron and Steel Research Institute Boiling 100081P.R.China

The electroslag metallurgy has been developed since 1958. At present, all special steel plants have constructed electroslag metallurgical workshops. There are 86 Electroslag Remetting (ESR) furnaces in these steel plants with annual capacity of 100 000 tons. The products by ESR include 243 designations of steel and superalloy. The Chinese metallurgists have made significant achievements in the type and structure of electroslag remelting furnaces, eletroslag remelting technology, shaped castings by Electroslag Remelting Casting (ESRC), the manufacture of large-size ingots by ESR and the study of ESR mechanism. These achievements have already been recognized by foreign metallurgists.

关键词： electroslag metallurgy electroslag remelting electroslag remelting casting

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不锈钢二次精炼的转炉化

钢铁 1999年第5期34卷 14-18页

作者：李正邦薛正良钢铁研究总院

对两种不同炉型的不锈钢精炼设备的特点进行了比较，与钢包型精炼设备相比，转炉型精炼设备炉容比大、吹氧和脱碳速度大、生产率高，而且可以使用高碳铬铁；具有真空精炼功能的精炼设备具备优越的深脱碳、氮热力学条件；真空转炉（ＶＯ... 详细信息

对两种不同炉型的不锈钢精炼设备的特点进行了比较，与钢包型精炼设备相比，转炉型精炼设备炉容比大、吹氧和脱碳速度大、生产率高，而且可以使用高碳铬铁；具有真空精炼功能的精炼设备具备优越的深脱碳、氮热力学条件；真空转炉（ＶＯＤＣ和ＶＣＲ）法在同一单元设备上兼有转炉炉型和真空精炼功能，是精炼超低碳、氮不锈钢的理想设备，特别是ＡＯＤ—ＶＣＲ法更适合于我国现有ＡＯＤ精炼炉的改造，用于生产超纯铁素体不锈钢。

关键词：不锈钢二次精炼真空转炉转炉