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Influence of Ru addition on microstructure and stress-rupture property of Ni-based single crystal superalloys

Progress in Natural science:materials International 2010年第1期20卷 61-69页

作者： Jing-yang CHEN~1,Qiang FENG~(1,2),La-mei CAO~3,Zu-qing SUN~1 1.State Key Laboratory for Advanced Metals and materials,university of science and technology beijing, beijing 100083,china 2.national center for materials service safety,university of science and technology beijing,beijing 100083,china 3.national Key Laboratory of science and technology on Advanced High Temperature Structural materials, beijing Institute of Aeronautical materials,beijing 100095,china State Key Laboratory for Advanced Metals and materials University of Science and Technology Beijing national center for materials service safety University of Science and Technology Beijing national Key Laboratory of science and technology on Advanced

The effects of Ru on the microstructure and stress-rupture property were investigated in two experimental Ni-based single crystal superalloys with and without Ru addition(5.1%,mass fraction).The results indicate that the morphology ofγ' precipitates in the dendrite core and interdendritic region are intermediate and nearly spherical,respectively,in the Ru-free alloy after being aged at 1100℃for 8 *** Re partitioning ratio increases due to Ru addition and Ru partitioned preferentially to theγphase in both dendrite core and interdendritic region of the Ru-containing alloy,which results in more negative lattice misfit and more cuboidalγ' ***,theγ' volume fraction increases while the precipitate size and y channel width decreases due to Ru addition in both dendrite core and interdendritic *** addition improves the stress-rupture life at 1100℃/140 MPa significantly due to higherγ' volume fraction,more negative lattice misfit and a well rafting structure as well as lessγchannel width.

关键词： Ni-based superalloys ruthenium elemental partitioning ratio lattice misfit γ’ morphology stress-rupture property

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Effects of complexing agents on acidic electroless nickel deposition

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Rare Metals 2010年第4期29卷 401-406页

作者： JIN Ying YU Hongying YANG Dejun SUN Dongbai national center for materials service safety University of Science and Technology Beijing Beijing 100083 China Corrosion andProteetion center School of Materials Science andEngineering University of Science and Technology Beijing Beij'ing 100083 China

Our previous study reported the influences of different complexing agents on electroless nickel （EN） by examining the properties of the deposits. In the present work, the effects of four common-used complexing agents on EN deposition rate and the stability of solution pH values were examined, either with an acetic pH buffer agent or absent of them. It is indicated that the pH buffeting effect of them is dominative when the EN solution is lack of the pH buffer. Under this situation, the EN deposition rate increases with the concentration of complexing agents increasing. The EN deposition rate decreases with fin＇ther adding the complexing agent when the solution already has enough pH buffer capability. Electrochemical impedance spectroscopy obtained during EN deposition illustrates that, in this case, the enhanced reaction resistance is the main reason for a lower deposition rate. However, the influence of polarization caused by mass transfer is not negligible at high complex ratio for sodium citrate and malic acid EN solutions.

关键词： electroless nickel complexing agents electrochemical impedance spectrum reaction resistance pH value

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Electrochemical impedance characteristics of LC4 aluminum alloy treated with ZH1 technique

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Rare Metals 2002年第1期21卷 48-55页

作者： ZHANG Wei, LI Jiuqing, WU Yinshun, and HE Jianping Corrosion and Protection center, university of science and technology beijing, beijing 100083, china Corrosion and Protection center University of Science and Technology Beijing 北京 100083

Zhl technique was used to form a corrosion resistant layer on LC4alloy. the composition of the layer was studied by X-rayphotoelectron spectroscopy (XPS). It is found that the layer iscomposed of oxides of metals on the sub- strate, such as Al_2O_3,ZnO, MgO_, CuO, and MnO_2. The elecrochemical impedance spectrums(EIS) of LC4 aluminum alloy specimen were measured in NaCl solutionsto study the mechanism of the corrosion resistance of the alloytreated with Zh1 technique.

关键词： aluminium alloy rare earth metal electrochemical impedance corrosion

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Effect of Heating Rate Before Tempering on Reversed Austenite in Fe-9Ni-C Alloy

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Journal of Iron and Steel Research International 2012年第9期19卷 73-78页

作者： ZHANG Kun , TANG Di , WU Hui-bin ( national Engineering Research center of Advanced Rolling , university of science and technology beijing , beijing 100083 , china ) national Engineering Research center of Advanced Rolling University of Science and Technology Beijing Beijing China

The alloy was reheated to 580℃ for tempering at rates of 2 , 5 , 10 , 20 , and 40℃ / s , respectively , after *** amount , distribution , and stability of reversed austenite were investigated by X-ray diffraction ( XRD ) and electron back scatter diffraction ( EBSD ) .The microstructure and cryogenic impact energy were studied by scanning electron microscope ( SEM ), transmission electron microscope ( TEM ) and Charpy V-notch ( CVN ) *** results showed that when the sample was heated at 10℃ / s , the volume fraction of reversed austenite exhibited maximum of 8% ; the reversed austenite was uniform along all kinds of boundaries ; the reversed austenite contained higher concentration of carbon which enabled it to be more *** cryogenic toughness of the alloy was greatly improved when heated at 10℃ / s , as the fracture surface observation showed that it mainly fractured in ductile rupture mode , which was consistent with the results of cryogenic impact energy.

关键词： 9Ni steel heating rate reversed austenite cryogenic toughness

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Slurry Preparation and Rolling of Semi-solid 60Si2Mn Spring Steel

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Journal of materials science & technology 2003年第6期19卷 613-616页

作者： Weimin MAO, Aimin ZHAO, Dong YUN, Leping ZHANG and Yonglin KANGSchool of materials science and Engineering, university of science & technology beijing, beijing 100083, china Sch. of Mat. Sci. and Eng. Univ. of Sci. and Technol. Beijing Beijing 100083 China

The nondendritic semi-solid slurry preparation of 60Si2Mn spring steel has been studied in this paper. The experiments have shown that when stirred for 2 min on the test condition, the semi-solid slurry with 50%-60% fraction solid and spherical primary austenitic grains in the size of 100-300 μm can be obtained and is easy to be discharged from the bottom little hole of the stirring chamber. The nondendritic slurry of 60Si2Mn spring steel can be rolled into given plate form successfully, but the solid phase and liquid phase is easy to be separated in rolling process so that the solid primary austenite is concentrated in the center and the liquid is near the edge of the rolled plate. The rupture strength and elongation of the plate rolled only once with semi-solid slurry are lower than that of the traditionally repeated hot-rolled plate of 60Si2Mn spring steel.

关键词： 60Si2Mn Semi-solid Electromagnetic stirring Rolling

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Online application of automatic surface quality inspection system to finishing line of cold rolled strips

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Journal of university of science and technology beijing 2003年第4期10卷 38-41页

作者： Hao Sun, Ke Xu, and Jinwu Xunational Engineering Research center of Advanced Rolling, university of science and technology beijing, beijing 100083, china national Engineering Research center of Advanced Rolling. university of science and technology beijing Beijing 100083 China

An automatic surface quality inspection system installed on a finishing lineof cold rolled strips is introduced. The system is able to detect surface defects on cold rolledstrips, such as scratches, coil breaks, rusts, roll imprints, and so on. Multiple CCD area scancameras were equipped to capture images of strip surface simultaneously. Defects were detectedthrough 'Dark-field illumination' which is generated by LED illuminators. Parallel computationtechnique and fast processing algorithms were developed for real-time data processing. Theapplication to the production line shows that the system is able to detect defects effectively.

关键词： surface inspection cold rolled strip finishing line CCD cameras imageprocessing

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Responding Depth of Photocatalytic Activity of TiO_2 Self-assembled Films

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Journal of materials science & technology 2004年第4期20卷 472-474页

作者： Weichang HAO, Feng PAN, Tianmin WANG and Shukai ZHENG)center of materials Physics and Chemistry, School of science, beijing university of Aeronautics and Astronautics, beijing 100083, chinaDepartment of materials science, Lanzhou university, Lanzhou 730000, china Ctr. of Mat. Phys. and Chem. Sch. of Sci. Beijing Univ. of Aero. and Astron. Beijing 100083 China Dept. of Mat. Sci. Lanzhou Univ. Lanzhou 730000 China

The electrostatically self-assembly method is getting strategically important to prepare multilayer thin films. With careful choice of component materials, this method should allow for the preparation of multilayer thin films with a variety of excellent technological properties. Ti02/PSS multilayer thin films with ordered structure were prepared by electrostatic self-assembly method. UV-Vis-NIR spectrophotometer, X-ray photoelectron spectroscopy (XPS), and atom force microscopy (AFM) were used to characterize the structure and performance of the multilayer films. Because electrostatically self-assembly method allows molecular-level control over the film composition and thickness, this paper studied the responding depth of photocatalytic activity of Ti02 self-assembled films in detail.

关键词： Responding depth Titanium dioxide Photocatalytic activity Electrostatically self-assembly

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Anomalous magnetotransport in LaMn_(1-x)Te_xO_3

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science china(Physics,Mechanics & Astronomy) 2009年第7期52卷 987-992页

作者： TAN GuoTai1,2, CHEN ZhengHao3 & ZHANG XiaoZhong4,5 1 Key Laboratory of Beam technology & materials Modification of the Ministry of Education, Institute of Low Energy Nuclear Physics, beijing Normal university, beijing 100875, china 2 beijing Radiation center, beijing 100875, china 3 Laboratory of Optical Physics, Institute of Physics, Chinese Academy of sciences, beijing 100080, china 4 Key Laboratory of Advanced materials of the Ministry of Education, Department of materials science and Engineering, Tsinghua university, beijing 100084, china 5 beijing national center for Electron Microscopy, Tsinghua university, beijing 100084, china Key Laboratory of Beam technology & materials Modification of the Ministry of Education Institute of Low Energy Nuclear Physics Beijing Normal University Beijing China beijing Radiation center Beijing China Laboratory of Optical Physics Institute of Physics Chinese Academy of Sciences Beijing China Key Laboratory of Advanced materials of the Ministry of Education Department of Materials Science and Engineering Tsinghua University Beijing China beijing national center for Electron Microscopy Tsinghua University Beijing China

The LaMn1-xTexO3+δ (x=0.1, 0.2, 0.3) were synthesized using solid-state reaction method for the first time. X-ray photoemission spectrum (XPS) shows that in the samples the Te ions have a valence of Te4+, and Mn3+ ions are partly converted into Mn2+ and Mn4+ due to the excess oxygen and Te doping. The magnetotransport associated with Mn2+, Mn3+ and Mn4+ was investigated. The experimental results show that the samples are insulator at 0 T when the amount of Mn3+ is much larger or less than the sum of Mn2+ and Mn4+; by contrast, the samples display metal to insulator transition with increasing temperature when the amount of Mn3+ is close to the sum of Mn2+ and Mn4+. These anomalous magnetotransport behaviors were analyzed in the frame of the double-exchange (DE) mechanism.

关键词： colossal magnetoresistance La-Te-Mn-O magnetotransport

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Semi-solid slurry preparation and rolling of 1Cr18Ni9Ti stainless steel

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Journal of university of science and technology beijing 2003年第6期10卷 35-39页

作者： Weimin Mao, Aimin Zhao, Dong Yun, Leping Zhang, and Xueyou Zhongmaterials science and Engineering School, university of science and technology beijing, beijing 100083, china Mat. Sci. and Eng. Sch. Univ. of Sci. and Technol. Beijing Beijing 100083 China

The preparation and rolling of the semi-solid slurry 1Cr18Ni9Ti stainlesssteel were researched. The experimental results show that when stirred for 2-3 min under the giventest condition, the semi-solid slurry with about 50 percent-60 percent (volume fraction) solid andthe spherical primary austenitic grains in the size of 100-200 mu m can be obtained, and it is easyto be discharged from the bottom little hole of the stirring chamber. The semi-solid slurry of1Cr18Ni9Ti stainless steel can be rolled into the given plate successfully. However, the solid phaseand liquid phase are easily separated in the rolling process, so that the solid primary austeniticgrains are concentrated in the center and the liquid phase is near the edge of the rolled plate. Thestrengths of the plate rolled in the semi-solid state are higher than that of the traditionallyrepeated hot-rolled plate of 1Cr18Ni9Ti stainless steel.

关键词： 1Cr18Ni9Ti semi-solid electromagnetic stirring rolling

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Experimental study on fire smoke movement in a multi-floor and multi-room building

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science china(Technological sciences) 2005年第3期48卷 292-304页

作者： ZHONG Maohua 1, 2 , LI Peide 2 , LIU Tiemin 1 , WEI Xing 1, 2 & LIAO Guangxuan 2 1. national center of safety science and technology, State Administration of Work safety, beijing 100029, china 2. State Key Laboratory of Fire science, university of science and technology of china, Hefei 230026, china national center of safety science and technology State Administration of Work Safety Beijing 100029 China

Fire smoke movement of multi-floor and multi-room (MFMR) fire was studied at the model test building in State Key Laboratory of Fire science (SKLFS). The ingredient, temperature, air pressure difference and air velocity of smoke were measured and analyzed. Meanwhile, the hazard of smoke ingredient to exposed occupants was analyzed based on the national standard, Occupational Exposure Limit for Hazardous Agents in the Workplace (GBZ2-2002). The experimental results showed that the maximum temperature difference in MFMR fire was located along the vertical height from the fire source. With the spreading and diffusion of smoke, the temperature of smoke layer would tend to be no difference. In the fire of woodpile and kerosene, the main smoke ingredients such as SO 2 , CO and CO 2 would first exceed human’s average physiological limit, while smoke ingredients such as NO and NO 2 would come behind. Because of the higher fluctuation range and frequency of air pressure difference of smoke in multi-layer building fire, the fire smoke would spread around everywhere of the passageway and made the human evacuation more difficult.

关键词： multi-floor and multi-room,fire experiment,smoke spread,smoke toxicity.

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