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Grain Refinement and Strengthening Mechanism of Automobile Beam Steels Produced by CSP technology

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Grain Refinement and Strengthening Mechanism of Automobile B...

APPLICATION OF THE ANNEXATION PRINCIPLE TO THE STUDY OF THERMODYNAMIC PROPERTIES OF TERNARY METALLIC MELTS Cd-Pb-Sb

第五届国际低合金高强度钢会议暨第三届国际超细晶粒钢会议

作者： ZHAO Zheng-zhi1, KANG Yong-lin1, YU Hao1, FU Jie2. MAO Xin-ping3, LIN Zhen-yuan3 (1. school of Materials science and {2., university of science and technology beijing, beijing, 100083, china 2. school of metallurgical and ecological engineering, university of science and technology beijing, beijing, 100083, china 3. Guangzhou Zhujiang Iron and Steel Co., Ltd., Guangzhou, 510730, china)

The microstructure characteristics, mechanical properties and misorientation of automobile beam steels produced by Compact Strip Production (CSP) were investigated by use of optical microscopy (OM), t

关键词： Compact Strip Production microstructure EBSD texture strengthening mechanism

来源： cnki会议评论

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Acta Metallurgica Sinica(English Letters) 2001年第5期14卷 368-374页

作者： J.Zhang metallurgical engineering {2., university of science and technology beijing, beijing 100083, china Sch. of Metall. Eng. Univ. of Sci. and Technol. Beijing Beijing 100083 China

Based on the phase diagrams, measured activities and the annexation principle, the calculating models of mass action concentrations for Cd-Pb, Pb-Sb and Cd-Sb binary as well as Cd-Pb-Sb ternary metallic melts have been formulated. The results of calculation both agree with practice and obey the mass action law. This in turn testifies that the models formulated can reflect the structural reality of corresponding melts and the annexation principle is applicable to these melts.

关键词： Antimony alloys Cadmium alloys Lead alloys Phase diagrams Thermodynamic properties

Application of the annexation principle to the study of thermodynamic properties of ternary metallic melts In-Pb-Ag and In-Bi-Sb

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Rare Metals 2002年第2期21卷 142-151页

作者： ZHANG Jianmetallurgical engineering {2..university of science and technology beijing, beijing 100083, china metallurgical engineering {2. University of Science and Technology Beijing 北京 100083

Based on the phase diagrams, measured activities an the annexationprinciple, the calculating models of mass action concentrations forin-Pb-Ag and In-Bi-Sb ternary metallic melts have been *** results of calculation both agree with practice, and obey the lawof mass action, showing that the models formulated can reflect thestructural reality of the corresponding melts and the annexationprinciple is applicable to the them.

关键词： activity mass action concnetration th annexation principle In-PB-Ag

Molar heat capacities of La2.o2.9 and La1.9Sr0.1Mo2.9-δ

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International Journal of Minerals,Metallurgy and Materials 2007年第5期14卷 395-398页

作者： Baijun Yan, Jianhua Liu, Yunduo Dai, Qifeng Shu, and Zhihua Ren metallurgical and ecological {2. school, university of science and technology beijing, beijing 100083, china [a]metallurgical ecological engineering {2. university of science technology beijing beijing 100083 china

The molar heat capacities of La2.o2.9 and La1.9Sr0.1Mo2.9-δ were obtained using the differential scanning calorimetry (DSC) technique in a temperature range from 2.8 to 1473 K. The DSC curve of La2.o2.9 showed an endothermal peak around 834 K corresponding to a first-order monoclinic-cubic phase transition, and the enthalpy change accompanying this phase transition is 5.99 kJ/mol. No evident endothermal peak existed in the DSC curve of La1.9Sr0.1Mo2.9-δ, but a broad thermal anomaly existed in its heat capacity curve at around 832.K. In addition, the heat capacity values of La2.o2.9 and La1.9Sr0.1Mo2.9-δ began to decrease at 1196 and 1330 K, respectively. The non-transitional heat capacity values of La2.o2.9 and La1.9Sr0.1Mo2.9-δ were formulated using multiple regression analysis in two temperature ranges.

关键词： heat capacity phase transition La2.o2.9 La1.9Sr0.1Mo2.9-δ DSC

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 {2. 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, {12. 100081, china 1. school of metallurgical and {2. 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 research work.

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

Preparation of titanium oxycarbide from various titanium raw materials:Part *** reduction

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Rare Metals 2010年第6期29卷 547-551页

作者： GAO Chengjun,JIANG Bo,CAO Zhanmin,HUANG Kai,and ZHU Hongmin school of metallurgical and {2. engineering,university of science and technology beijing,beijing 100083,china school of metallurgical and {2. engineering University of Science and Technology Beijing Beijing China

Carbothermal reduction was performed at temperatures up to 1600°C for vanadium-bearing titanomagnetite,ilmenite concentrate,and high titania *** possibility of selective carbothermal reduction was discussed in detail from the viewpoint of thermodynamics,and also *** products were analyzed by X-ray diffraction,scanning electron microscopy,and chemical *** results show that it is possible to reduce all iron oxide to metallic iron,and titania to oxycarbide（TiCxOy）,without the reduction of other oxides like silica and magnesia.

关键词： titanium carbothermal reduction oxycarbide ilmenite

The precipitation and effect of nano nitrides in HSLC steel

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science china(Technological sciences) 2008年第7期51卷 989-998页

作者： FU Jie1, LIU YangChun1,2.& WU HuaJie1,3 1 school of metallurgical and {2. engineering, university of science and technology beijing, beijing 100083, china 2.Shougang technology Research Institute, Shougang (Group) Corporation, beijing 100041, china 3 metallurgical engineering Research Institute, university of science and technology beijing, beijing 100083, china 1. school of metallurgical and {2. engineering University of Science and Technology Beijing Beijing 100083 China 2. Shougang technology Research Institute Shougang (Group) Corporation Beijing 100041 China 3. metallurgical engineering Research Institute University of Science and Technology Beijing Beijing 100083 China

The existing forms of N and Al in HSLC (high strength low carbon) steel produced by TSCR (thin slab casting and rolling process), the precipitation thermodynamics and kinetics of AlN, and its effects on structure and mechanical property are studied. The experimental results show that only a small quantity of nitrogen is com- bined into AlN in HSLC steel produced by TSCR and most of the nitrogen in steel is still free nitrogen. Aluminum-nitride is mainly precipitated during the period of slow air cooling after coiling, but not during rolling and water cooling. The acid-soluble aluminum has no obvious effect on the grain size and mechanical property of HSLC steel produced by TSCR whose acid-soluble aluminum content is 0.005%―0.043%. The precipitation of AlN is not the main cause of grain refinement of HSLC steel produced by TSCR, nor is AlN the dominating precipitate that has precipitation strengthening effect. The nano nitrides are not pure AlN, but have complex compositions.

关键词： thin slab casting and rolling high strength low carbon steel AlN nano nitride precipitation strengthening

Thermodynamic properties and mixing thermodynamic parameters of binary homogeneous metallic melts

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Rare Metals 2003年第1期22卷 25-32页

作者： ZHANG Manmetallurgical engineering {2., university of science and technology beijing, beijing 100083, china metallurgical engineering {2. University of Science and Technology Beijing 北京 100083

After the investigation on the thermodynamic properties and mixingthermodynamic parameters of binary homogeneous metallic melts involving compound, peritectic as wellas solid solution, it was found that the equations of mixing free energy DELTA G^m and excess freeenergy DELTA G^(XS) of them can he expressed by the following equations: DELTA G^m = SIGMA x [SIGMAN_i DELTA G_I^(THETA) + RT(SIGMA N_j ln N_j + SIGMA N_i ln N_i )] and DELTA G^(XS) = DELTA G^m -RT(a ln a + b ln b), respectively.

关键词： metallic melt mixing thermodynamic parameter coexistence theory activity mass action concentration

Electrochemical studies of nickel deposition from aqueous solution in super-gravity field

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science china(Technological sciences) 2007年第1期50卷 39-50页

作者： GUO ZhanCheng1,2. GONG YingPeng2.& LU WeiChang2.1 metallurgical & ecological {2., university of science and technology, beijing 100083, china 2.Institute of Process engineering, Chinese Academy of sciences, beijing 100080, china 1. metallurgical & ecological {2. University of Science and Technology Beijing 100083 China 2. Institute of Process engineering Chinese Academy of Sciences Beijing 100080 China

The effect of super-gravity on electrochemical deposition of nickel from aqueous solution was studied. The SEM pictures show that the microstructure of nickel film deposited under the super-gravity condition is finer and more uniform compared with that obtained in normal gravity condition, and the crystal grains diminish with the increase of super-gravity coefficient. The XRD patterns indicate that the arrangement of crystalline grains of nickel film deposited under the super-gravity field is more regular, and the crystalline grain sizes decrease with the increase of super-gravity coefficient. Toughness, tensile stress and hardness of the nickel film are markedly raised with the increase of super-gravity coefficient, and hydrogen content in the nickel film decreases with the increase of super-gravity coefficient. From the polarization curves of hydrogen evolution reaction under the super-gravity condition, a significant reduction of over-potential on electrode was found when current density increased. The process of hydrogen evolution reaction was enhanced under the super-gravity condition. The electro-deposition rate, the microstructure and properties of deposited nickel film under super-gravity condition were still affected by the relative orientation between inertia force and depositing surface. It is favorable to gain the nickel film with better mechanic properties when inertia force orientates vertically towards depositing surface. Keywords super-gravity - electrochemistry - electro-deposition - nickel film Supported by the Notional Natural science Foundation of china (Grant No. 50674011)

关键词： super-gravity electrochemistry electro-deposition nickel film