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Fractals in Steel-Aluminum Solid to Liquid Bonding

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Journal of Materials Science & Technology 1999年第5期15卷 486-488页

作者： Zhang, P Du, YH Ren, XP Ba, LM Liu, HW Cui, JZ Univ Sci & Technol Beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China Anshan Automobile Fittings Factory Anshan 114014 Peoples R China Northeastern Univ Met Forming Dept Shenyang 110006 Peoples R China

This paper studied the fractal characteristic of the interfacial shear surface of steel-Al solid to liquid bonding plate, and determined the relationship between fractal dimension and interfacial shear strength. The research results showed that the relationship between fractal dimension and interfacial shear strength could be described as y=26.2x+4.2 (where y was interfacial shear strength, x was fractal dimension) and when 08Al steel plate was coarsened by steel wire wheel which was made up with steel wires whose diamet.r were 1.4 similar to 1.6 mm, the optimum coarsening pattern of the steel plate surface could be got, the corresponding maximum interfacial shear surface fractal dimension of the bonding plate was 2.33, and the maximum interfacial shear strength of the bonding plate was 65.3 MPa.

关键词： Nature MPa

A simple met.od of synthesizing multi-wall carbon nanotubes/SnO core/shell nanostructure

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Rare met.ls 2007年第S1期26卷 191-194页

作者： SUN Xue1),CHU Yi2),WANG Dawei3),DU Jinhong3),ZHANG Baoyou2),and WANG Fuping1)1) sch.ol of Science,Harbin Institute of Technology,Harbin 150001,China 2) sch.ol of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China 3) Shenyang National Laboratory for Materials Science,Institute of met.l Research,Chinese Academy of Sciences,Shenyang 110016,China Harbin Inst Technol Sch Sci Harbin 150001 Peoples R China Harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China Chinese Acad Sci Inst Met Res Shenyang Natl Lab Mat Sci Shenyang 110016 Peoples R China

Multi-wall carbon nanotubes(MWNTs)/SnO core/shell nanosturcture was synthesized by a simple solution-based met.od,in which SnCl2 was solved in distilled water containing dispersed MWNTs,then stired,filtered and washed in ambient atmosphere,finally dryed in air at 90 ℃ for 6 *** MWNTs/SnO core/shell nanostructure was characterized by X-ray diffraction(XRD),transmission electron microscopy(TEM).It is found that surface defects of MWNTs are necessary for the deposition of *** mechanism of the SnO nanocoating formation through the hydrolysis of SnCl2 in water(4SnCl_2+2H_2O-Sn_4(OH)2Cl_6+2HCl) was presented.

关键词： precipitate isothermal aging thermodynamic calculation phase diagram high nitrogen austenitic stainless steel

Formation of Intragranular Ferrite During Isothermal/Thermomechanical Processes in a Medium Carbon V-Ti-N Microalloyed Steel

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Journal of Iron and Steel Research International 2011年第S1期18卷 350-354页

作者： XU Lei 1,LIU Guo-quan 2,NIE Yu-zhu 1,WANG Xue-hui 1,MA E 1 (1.Hebei Iron and Steel Technology Research Institute,Shi Jiazhuang 050021,Hebei,China 2.sch.ol of Materials Science and Engineering /State Key Laboratory for Advanced met.ls and Materials,University of Science and Technology Beijing,Beijing 100083,China) Hebei Iron & Steel Technol Res Inst Shijiazhuang 050021 Hebei Peoples R China Univ Sci & Technol Beijing Sch Mat Sci & Engn State Key Lab Adv Met & Mat Beijing 100083 Peoples R China

For a V-Ti-N microalloyed steel with 0.34%C-1.54%Mn,intragranular ferrite (IGF) was obtained in both isothermal austenite decomposition processes and thermomechanical processes simulating the industrial seamless tubing manufacture *** show that with decrease of the isothermal temperature in range of 600℃ down to 450℃,not only the morphology of IGF changed from equiaxed to acicular,but also the equiaxed IGF and the acicular IGF were *** importantly,it is found that the amount of equiaxed ferrite increased significantly in the thermomechanical process sample water quenched from 550℃ after 800℃ deformation than that in the isothermally treated sample at 550℃ sample without hot *** implies that appropriate controlled deformation with controlled cooling can significantly promote equiaxed IGF formation,and not solely rely on nucleation mechanisms related with *** deformation of austenite without dynamic and complete static recrystallization causes high energy regions,therefore further promotes the nucleation potency of IGF.

关键词： V-Ti-N microalloyed steel intragranular ferrite (IGF) isothermal treatment thermomechanical processes controlled cooling

Facile and green route to highly luminescent ZnS-shelled CdSe nanocrystals

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Rare met.ls 2009年第2期28卷 107-111页

作者： Ye Xinyua Zhuang Weidong Hu Yunsheng Luo Xinyu Zhao Chunlei Huang Xiaowei Gen Res Inst NonFerrous met Natl Engn Res Ctr Rare Earth Mat Beijing 100088 Peoples R China Grirem Adv Mat Co Ltd Beijing 100088 Peoples R China Jiangxi Univ Sci & Technol Sch Mat & Chem Engn Ganzhou 341000 Peoples R China

Highly luminescent CdSe/ZnS nanocrystals were obtained by adapting non-TOP-based synthesis and a subsequent two-phase ZnS shelling procedure:the core CdSe nanocrystals were synthesized in sole solvent paraffin liquid with cadmium oxide,elemental sele-nium,and oleic acid; the deposition of the ZnS shell was conducted by using zinc stearate in toluene and sodium sulfide in deionized water. The green and low-cost route was proved to be more efficient to constrain the size of core nanocrystals while tuning the ...

关键词： crystal structure characterization solvent growth from solution nanomaterials CdSe/ZnS

Microstructure Characteristics in Ultrafine-grained Commercially Pure Aluminium after Laser Shock Processing

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稀有金属材料与工程 2011年第S3期40卷 176-178页

作者： Xiong Yi1,2, He Tiantian1, Zhang Fangyu3, Chen Zhengge4, Zhang Lingfeng1,2, Ren Fengzhang1,2 1 Henan University of Science and Technology, Luoyang 471003, China 2 Henan Key Laboratory of Advanced Non-Ferrous met.ls, Luoyang 471003 China 3 No. 71781 Unit of PLA, Luoyang 471100, China 4 No. 63883 Unit of PLA, Luoyang 471100, China Henan Univ Sci & Technol Sch Mat Sci & Engn Luoyang 471003 Peoples R China Henan Key Lab Adv Nonferrous met Luoyang 471003 Peoples R China 71781 Unit PLA Luoyang 471100 Peoples R China 63883 Unit PLA Luoyang 471100 Peoples R China

The aim of this paper was to address the effect of laser shock processing (LSP) on the microstructure of ultrafine-grained commercially pure aluminium which was produced through severe cold rolling and annealing. The microstructure characteristics of ultrafine-grained commercially pure aluminium were experimentally investigated by TEM during ultra-high strain rate loading. The results show that microstructure was obviously refined due to ultra-high plastic strain induced by a single pass LSP impacts. The grain sizes decrease from 0.6 μm after severe cold rolling and annealing to 0.3 μm at the center of the laser shock wave after a single pass LSP. There is a distinct increase in the dislocation density at the edge of the laser shock wave. These experiments have guide meaning to the practical engineering applications of LSP technique.

关键词： laser shock processing ultrafine-grained commercially pure aluminium microstructure

Study on Transformation of CaO-Al_2O_3-SiO_2-MgO System Inclusions in ZG06Cr13Ni4Mo Stainless Steel

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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 2. sch.ol of met.llurgical and Ecological Engineering,University 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 Natl Engn Res Ctr Adv Steel Technol Beijing 100081 Peoples R China Univ Sci & Technol Beijing Sch Met & Ecol Engn Beijing 100083 Peoples R China

This paper aims at generally studying on the inclusions of ZGG06Cr13Ni4Mo 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-Al2O3-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 1280℃ While MgO weight concentration is 10% in CaO-SiO2-Al2O3-MgO system, SiO2, Al2O3 and CaO in inclusions are in weight concentration range of 50-70%, 10-20% 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： ZG06Cr13Ni4Mo stainless steel low melting point inclusion thermodynamic calculation

Simulation of Thermodynamics and Kinetics for KR Desulphurization

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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. sch.ol of met.llurgical and Ecological 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 201900,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 paramet.rs, reduce the cost of desulphurization and the consumption of operation about KR pretreatment of hot met.l at the Stainless Steel Company, Baosteel Group. Based on the theoretical analysis of physical chemistry in met.llurgy, simulation experiments of the KR desulphurization of hot met.l 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 paramet.rs of the process are put forward.

关键词： desulphurization of hot met.l KR, desulphurization thermodynamics water model

Effect of Carbon on Dynamic Recrystallization Behavior of Vanadium Microalloy Steels

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Journal of Iron and Steel Research International 2011年第S1期18卷 129-134页

作者： LIU Guo-quan 1,2,ZHAO Hai-tao 1,WU Jin-bin 1,WANG Cheng-yang 1,XU Lei 1,3 (1.sch.ol of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China 2.State Key Laboratory for Advanced met.ls and Materials,University of Science and Technology Beijing,Beijing 100083,China 3.Department of Materials Science and Engineering,Tsinghua University,Beijing 100084,China) Univ Sci & Technol Beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China Univ Sci & Technol Beijing State Key Lab Adv Met & Mat Beijing 100083 Peoples R China Tsinghua Univ Dept Mat Sci & Engn Beijing 100084 Peoples R China

The hot working behavior especially dynamic recrystallization of low-carbon and medium-carbon vanadium microalloy steels has been studied by performing isothermally compression tests and Avrami *** Avrami plots of the two experiment steels have been constructed based on flow stress curves following a new approach (Jonas,et *** Mater.,2009,57(2):2748-2756;Wu et al,Acta ***.,2010,46(7):838-843).It is experimentally found that the carbon effect on dynamic recrystallization is opposite to each other in lower and higher strain ranges:Carbon causes a softening effect at low strain rates (0.01,0.1,and 1.0 s-1),and a hardening effect at high strain rates (10.0 and 30.0 s-1).Correspondingly,carbon promotes the dynamic recrystallization at low strain rates and retards the dynamic recrystallization at high strain rates in the experimental *** phenomenon is then tentatively explained based on the possible mechanisms of dynamic process at different strain rates.

关键词： vanadium microalloy steels hot working dynamic recrystallization carbon strain rate Avrami modeling

Analysis and Control on Fracture of 20Mn2A High Tensile Steel for Round Link Chain

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Journal of Iron and Steel Research International 2011年第S1期18卷 898-902页

作者： CAO Shu-wei 1,2,KANG Yong-lin 1,3,ZHAO Xian-ping 2,YANG Chang-chun 1 (1.sch.ol of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China 2.Technology Center of Anyang Iron & Steel Group Co.,Ltd.,Anyang 455004,Henan,China 3.State Key Laboratory for Advanced met.ls and Materials,University of Science and Technology Beijing,Beijing 100083,China) Univ Sci & Technol Beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China Anyang Iron & Steel Grp Co Ltd Ctr Technol Anyang 455004 Henan Peoples R China Univ Sci & Technol Beijing State Key Lab Adv Met & Mat Beijing 100083 Peoples R China

Based on the phenomenon of brittle fracture occurred during tensile test for 20Mn2A high strength circular chain used in coal mines,the fracture property is regarded as intercrystalline brittle one after macroscope observation and met.llographic *** is analysed that the intercrystalline brittle fracture is due to high tempering temperature and limited processing site where final products are piled together after heat treatment,which lead to a lower cooling rate of internal chain,with Si,Mn and P etc elements segregating and enriching in the austenite grain boundary and forming high tempering *** these circular chains are tempered again for one hour at 670℃,and oil-cooled rapidly,due to the reversibility of high temper brittleness for structural alloy steel,the high temper brittleness can be eliminated and products are completely qualified after tensile inspection.

关键词： high strength circular chain met.llographic examination brittle fracture high tempering brittleness improvement measures