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Study on Transformation of CaO-Al_2._3.SiO_2.MgO System Inclusions in ZG06Cr13.i4Mo Stainless {2.

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Journal of iron and steel {2. International 2011年第S2期18卷 341-346页

作者： LIU Jian-hui1,3. DONG Han1,3. ZHU Rong2. LI Shi-qi2.(1. {2. for Structural Materials,central iron and {3. research {2., Beijing 100081,China 2. School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing, Beijing 100083.China 3. National Engineering research Center of Advanced {3. Technology, Beijing 100081,China) Cent iron & steel Res Inst Inst Struct Mat Beijing 100081 Peoples R China Univ Sci & Technol Beijing Sch Met & Ecol Engn Beijing 100083 Peoples R China Natl Engn Res Ctr Adv steel Technol Beijing 100081 Peoples R China

This paper aims at generally studying on the inclusions of ZGG06Cr13.i4Mo ultra-low carbon stainless steel used for large scale hydraulic turbine sets. On the basis of analysis the industrial test samples, thermodynamic software FactSage is used to study inclusions transformation process in CaO-SiO2.Al2.3.MgO system while stainless steel is been smelting. The results illustrate the inclusions melting points and plasticity variation law. The reasonable inclusions plasticity controlling area is found out in low melting point. The melting point is up to 12.0℃ While MgO weight concentration is 10% in CaO-SiO2.Al2.3.MgO system, SiO2. Al2.3.and CaO in inclusions are in weight concentration range of 50-70%, 10-2.% and 10-40%, respectively. For purpose of gaining low melting point inclusions, silicon alumina radio in deoxidant should be controlled between 2.5 for ultra-low carbon stainless steel refining in industry.

关键词： ZG06Cr13.i4Mo stainless steel low melting point inclusion thermodynamic calculation

Finite Element Analysis of Die Geometry and Process Conditions Effects on Equal Channel Angular Extrusion for β-Titanium Alloy

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Journal of iron and steel {2. International 2012年第10期19卷 54-58页

作者： SI Jia-yong1,2. GAO Fan3. ZHANG Ji3.(1. State Key Laboratory of Powder Metallurgy, {2. South University, Changsha 410083. Hunan, China 2. College of Mechanical and Electrical Engineering, {2. South University of Forestry and Technology, Changsha 410004, Hunan, China 3. High Temperature Material research Division, {2. iron and steel research institute, Beijing {12., China) [a] State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 Hunan China [b] College of Mechanical and Electrical Engineering Central South University of Forestry and Technology Changsha 410004 Hunan China [c] High Temperature Material research Division Central Iron and Steel Research Institute Beijing 100081 China

The finite element analysis was applied to evaluate the respective influences of die geometry and process conditions on plastic strain distribution for β-titanium (Ti-13.11Cr3.l) alloy during the equal channel angular extrusion (ECAE). It was found that optimum equal channel angular extrusion die geometry is strongly material dependent. Optimal strain homogeneity in the Ti-13.11Cr3.l alloy may be achieved at r (inner radius)=5 mm, R (outer radius)=3.mm. The equivalent plastic strain increases with increasing friction coefficient. And the better homogeneity of the equivalent plastic strain distribution can be achieved when friction coefficient value is lower. The faster the ram speed is, the lower the homogeneity of the equivalent plastic strain distribution is and the influence is slight. The back-pressure does not help to improve the plastic strain homogeneity, and the increasing temperature has a slightly favourable effect on the plastic strain homogeneity between 400 and 600 ℃.

关键词： equal channel angular extrusion finite element analysis die geometry β-titanium

The mathematical model of wetting angle of heterogeneous nucleation

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Science China(Technological Sciences) 2004年第4期47卷 391-397页

作者： HUANG Cheng1, SONG Bo1, MAO Jinghong2.& ZHAO Pei3.1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083. China 2. School of Material Science, University of Science and Technology Beijing, Beijing 100083. China 3. central iron and steel research institute, Beijing 100081, China 1. School of Metallurgical and Ecological Engineering University of Science and Technology Beijing 100083 Beijing China 2. School of Material Science University of Science and Technology Beijing 100083 Beijing China 3. central iron and steel research institute 100081 Beijing China

The heterogeneous nucleation has been analyzed in terms of the thermodynamic theory, and the mathematical model of wetting angle of heterogeneous nucleation has been developed based on the dynamic requirements of hetero- and homogeneous nucleation. With the wetting angel model, the wetting angles of different catalysts in liquid iron have been calculated. The result shows that the wetting angle of most catalysts is smaller than 40, and the value of f() is far less than 1. The wetting angles of TiN, TiC and RE2.3.are smaller, while the wetting angle of MnO is bigger among the ordinary nucleation catalysts. The wetting angles calculated by this model are in agreement with the results of other {2. work.

关键词： heterogeneous nucleation, mathematical model, wetting angle, undercooling.

Synthesis of SiC/Al Co-Continuous Composite by Spontaneous Melt Infiltration

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Journal of Materials Science & Technology 2000年第5期16卷 466-470页

作者： Guangwei HAN and Di FENG (central iron & {2. {3. institute, Beijing 100081, China) central iron and {2. {3. institute Beijing 100081 China

Investigation has been made on the process of synthesizing SiC/Al co-continuous composite by spontaneous melt infiltration. It is found that nitrogen atmosphere is an indispensable factor for spontaneous infiltration of melt Al into SiC preform with continuous porosity. The critical temperature for spontaneous infiltration occurrence can be lowered and spontaneous infiltration rate increased by doping a small amount of Mg into the Al alloy. Adding fine SiO2.powders into the ceramic preform can play the similar role as Mg-doping by increasing wetting through the chemical reaction of 3.iO2.4AI=2.l2.3.3.i at the infiltration front. Infiltration rate can also be increased by Si-doping to lower the viscosity of the molten Al alloy. In addition, sufficient Si content in the molten Al is also indispensable to avoid the formation of Al4C in the synthesized composite.

关键词： Co SiC Synthesis of SiC/Al Co-Continuous Composite by Spontaneous Melt Infiltration Al

Effects of Temperature and Disperse Phase of Disordered γ on Strain Hardening Rate of Ni_3.l

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Journal of Materials Science & Technology 1995年第6期11卷 403-408页

作者： Guangwei HAN Di FENG and Wujun YE (central iron and {2. {3. institute, Beijing, 100081, China) central iron and {2. {3. Inst Beijing China

Investigations have been made on the effects of temperature and fine disperse phase of disordered γ on strain hardening rate of Ni3.l based alloy. The result is found that there exists a peak temperature for the strain hardening rate of Ni3.l based alloy below the peak temperature of its yield strength. Analysis shows that the appearance of the peak temperature of strain hardening rate is caused by both the decreasing of the movability of superdislocations on {111}slip plane and the increasing of the dynamic recovery in Ni3.l with increasing temperature. A Ni3.l based alloy hardened by disperse phase of disordered γ has been obtained by controlling chemical composition and treating processes. The peak temperature of strain hardening rate of this alloy is increased due to the fine disperse phase of disordered γ, which causes the reductions of the movability of the superdislocations and the dynamic recovery in Ni3.l

关键词： OO Al on Strain Hardening Rate of Ni3.l Ni

More Discussion on High Efficiency & Low Cost Clean steel Production Platform

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Journal of iron and steel {2. International 2011年第S2期18卷 1-8页

作者： YIN Rui-yu (central iron and {2. {3. institute, Beijing, 100081) Cent iron & steel Res Inst Beijing 100081 Peoples R China

The construction of high efficiency, low cost clean steel platform is one of the common key technologies concerning efficiency, quality and cost. It is basic and universal and not only applicable in the R&D and production of "high-end" products, but also in the production of bulk ordinary steel products. The platform of high efficiency, low cost clean steel is the important direction of modern steel technology progress and has great significance on the competitiveness of each steel plant. The research of high efficiency, low cost platform not only involves the production and management of the steel plant, but also the academic research field (process engineering and dynamic operation) and theories and methods innovation of engineering design (theory and method of dynamic-precision design). The integrated theory and method of high efficiency and low cost clean steel platform is the binding point of metallurgical process engineering and material engineering. Different types of high efficiency, low cost clean steel platform should combine with the corresponding rolling process and iron making process so that high efficiency, low cost clean steel manufacturing system would come into being.

关键词： more discussion high efficiency & low cost clean steel platform integration technology

Development of Rapidly Quenched Soft Magnetic Materials in China

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Journal of Materials Science & Technology 2000年第2期16卷 131-136页

作者： Shaoxiong ZHOU (National Amorphous and Nanocrystalline Alloy Engineering research Center, central {2. and {3. research institute, Beijing 100081, China) National Amorphous and Nanocrystalline Alloy Engineering research Center Central Iron and Steel Research Institute Beijing 100081 China

The discovery of the first Fe-based ferromagnetic amorphous alloy in 1966 had made an impact on conventional magnetic materials because of its unique properties. Since then, a number of amorphous magnetic materials have been successfully developed and used in a wide variety of applications. A brief review of R & D activities on amorphous soft magnetic materials in China is given from the beginning to the present in a somewhat chronological order, followed by a brief introduction to their applications on electric and electronic industries. An analysis and a prospect of Chinese market of such amorphous materials are also presented.

关键词： Development of Rapidly Quenched Soft Magnetic Materials in China

THERMODYNAMICS　OF　Cu-Y-M(M=Al,Si,Ti,Fe)LIQUID　SOLUTIONS

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中国有色金属学会会刊：英文版 1994年第4期4卷 16-19页

作者： Du,Ting Li, Guodong(central iron and {2. {3. institute, Beijing 100081)

ＴＨＥＲＭＯＤＹＮＡＭＩＣＳＯＦＣｕ－Ｙ－Ｍ（Ｍ＝Ａｌ，Ｓｉ，Ｔｉ，Ｆｅ）ＬＩＱＵＩＤＳＯＬＵＴＩＯＮＳ￥Ｄｕ，Ｔｉｎｇ；Ｌｉ，Ｇｕｏｄｏｎｇ（ＣｅｎｔｒａｌＩｒｏｎａｎｄＳｔｅｅｌＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅ... 详细信息

ＴＨＥＲＭＯＤＹＮＡＭＩＣＳＯＦＣｕ－Ｙ－Ｍ（Ｍ＝Ａｌ，Ｓｉ，Ｔｉ，Ｆｅ）ＬＩＱＵＩＤＳＯＬＵＴＩＯＮＳ￥Ｄｕ，Ｔｉｎｇ；Ｌｉ，Ｇｕｏｄｏｎｇ（ＣｅｎｔｒａｌＩｒｏｎａｎｄＳｔｅｅｌＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅ，Ｂｅｉｊｉｎｇ１０００８１）Ａｂ...

关键词： iso-activity interaction coefficient Cu-Y-M(M=Al, Si, Ti, Fe)

ADVANCE IN Ti_3.Al AND TiAl INTERMETALLICS research IN CISRI

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Acta Metallurgica Sinica(English Letters) 1995年第Z1期8卷 531-541页

作者： ZHONG Zengyong ZO U Dunxu LI Shiqiong (central iron and {2. {3. institute, Beijing 100081 . China) central and steel {2. Inst Beijing China

Recent work on Ti_3.l base alloy,TAC-1, developed in CISRI, including investigations of effects of modification in alloying and TMP on microstructural characteristics and mechanical behaviour,indicates that alloy TAC -1 is very promising structural material for a number of elevated temperature applications. Stuody dealing with a reverse relation between RT ductility and toughness found on TiA base alloy, TAC-2. led to development of a special heat treatment technique for producing a fine filly lamellar microstructure (FFL), which gives a high and balancing ductility and toughness. This is also of significance for promoting engineering applications of this alloy.

关键词： Ti_3.l TiAl intermetallics