检索结果-南通市图书馆

The precipitation and effect of nano nitrides in HSLC steel

在线全文

学校读者我要写书评

暂无评论

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. {3. 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

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

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research 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. Institute for Structural Materials,Central Iron and Steel Research Institute, Beijing 100081,china {3.,{2. of science and technology Beijing, Beijing 100083.china 3. National engineering Research Center of Advanced Steel 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

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

在线全文

学校读者我要写书评

暂无评论

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. {3., 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 83. 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 83.0}K. In addition, the heat capacity values of La2.o2.9 and La1.9Sr0.1Mo2.9-δ began to decrease at 1196 and 13.0 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

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

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

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

作者： J.Zhang metallurgical engineering {2., {3. 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

Simulation of Thermodynamics and Kinetics for KR Desulphurization

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2011年第S2期18卷 98-106页

作者： XU An-jun1, ZHANG Mao-lin2. ZHANG Hui-ning1, LI An-dong3.(1. school of metallurgical and {2. engineering, university of science and technology Beijing, Beijing 100083.china 2. Steel-Making and Continuous Casting engineering Institute, Capital engineering and Research Incorporation Limited, Beijing 100176,china 3. Stainless Steel Company, Baosteel Group, Shanghai 2.1900,china) Univ Sci & Technol Beijing Sch Met & Ecol Engn Beijing 100083 Peoples R China Capital Engn & Res Inc Ltd Steel Making & Continuous Casting Engn Inst Beijing 100176 Peoples R China Stainless Steel Co Baosteel Grp Shanghai 201900 Peoples R China

This paper seeks to optimize parameters, reduce the cost of desulphurization and the consumption of operation about KR pretreatment of hot metal at the Stainless Steel Company, Baosteel Group. Based on the theoretical analysis of physical chemistry in metallurgy, simulation experiments of the KR desulphurization of hot metal were conducted in a laboratory and the composition of the desulphurization was optimized, by means of chemical analysis, DSC, SEM and EDS. The water modeling displays the fluid flow characteristics of KR desulphurization. Combination of the techniques and production at the Stainless Steel Company, Baosteel Group, the optimized parameters of the process are put forward.

关键词： desulphurization of hot metal KR, desulphurization thermodynamics water model

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

在线全文

学校读者我要写书评

暂无评论

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. {3.,university of science and technology Beijing,Beijing 100083.china school of metallurgical and {2. {3. 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

Photoluminescence and cathodoluminescence properties of a novel CaLaGa_3._7:Dy^(3.) phosphor

在线全文

学校读者我要写书评

暂无评论

Chinese science Bulletin 2012年第7期57卷 827-831页

作者： ZHAO WenYu1,2. AN ShengLi1, FAN Bin1, LI SongBo1 & DAI YaTang3.1 school of metallurgical and {2. engineering, university of science and technology Beijing, Beijing 100083, china 2.school of Chemistry and Chemical engineering, Inner Mongolia university of science and technology, Baotou 014010, china 3.school of Materials science and engineering, Southwest university of science and technology, Mianyang 62.000, china school of metallurgical and {2. {3. University of Science and Technology Beijing school of Chemistry and Chemical engineering Inner Mongolia University of Science and Technology

A single host white emitting phosphor, CaLaGa3.7:Dy3., was synthesized by chemical co-precipitation. Field emission scanning electron microscopy, X-ray diffraction, laser particle size analysis, and photoluminescence and cathodoluminescence spectra were used to investigate the structural and optical properties of the phosphor. The phosphor particles were composed of microspheres with a slight tendency to agglomerate, and an average diameter was of about 1.0 μm. The Dy3. ions acted as luminescent centers, and substituted La3. ions in the single crystal lattice of CaLaGa3.7 where they were located in Cs sites. Under excitation with ultraviolet light and a low voltage electron beam, the CaLaGa3.7:Dy3. phosphor exhibited the characteristic emission of Dy3. (4F9/2.6H15/2.and 4F9/2.6H13.2.transitions) with intense yellow emission at about 573.nm. The chromaticity coordinates for the phosphor were in the white region. The relevant luminescence mechanisms of the phosphor are investigated. This phosphor may be applied in both field emission displays and white light-emitting diodes.

关键词：光致发光阴极射线荧光粉镝离子场发射扫描电子显微镜白色发光二极管特性 X射线衍射仪

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

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2002年第2期21卷 142-151页

作者： ZHANG Jianmetallurgical engineering {2..{3. 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

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

在线全文

学校读者我要写书评

暂无评论

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

作者： GUO ZhanCheng1,2. GONG YingPeng2.& LU WeiChang2.1 {3. & 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