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71.
Guo-jun Wang ) Bai-qing Xiong) Yong-an Zhang) Zhi-hui Li) Pei-yue Li) ) State Key Laboratory for Fabrication Processing of Nonferrous Metals General Research Institute for Nonferrous Metals Beijing China ) Northeast Light Alloy Co. Ltd. Harbin China 《北京科技大学学报(英文版)》2009,16(4):427-431
The microstructure of the as-cast 2D70 aluminum alloy and its evolution during homogenization were investigated by means of optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and differential scanning calorimetry (DSC) analysis. The results indicate that the microstructure of the as-cast 2D70 aluminum alloy mainly consists of the dendritic network of aluminum solid solution and intermetallic compounds (Al2CuMg, Al2Cu, Al9FeNi, Cu2FeAl7... 相似文献
72.
Evolution of carbides and carbon content in matrix of an ultra-high carbon sintered steel during heat treatment process 总被引:2,自引:0,他引:2
Yuan-zhi Zhu ) Zhe Zhu) Zhi-min Yin) Zhi-dong Xiang) ) Key Laboratory of the Ministry of Education of China for Ferrous Metallurgy Resources Utilization Wuhan University of Science Technology Wuhan China ) School of Materials Metallurgy China ) School of Material Science & Engineering Central South University Changsha China 《北京科技大学学报(英文版)》2009,16(3):299-303
DTA, thermal expansion, XRD, and SEM were used to evaluate the effect of quenching temperature on the mechanical properties and microstructure of a novel sintered steel Fe-6Co-1Ni-5Cr-5Mo-1C. Lattice parameters and the mass fraction of carbon dissolved in the matrix of the steel quenched were investigated. It is discovered that the hardness of the steel increases with quench-ing temperature in the range of 840-900℃ and remains constant in the range of 900 to 1100℃. It decreases rapidly when the tem-perature is higher than 1100℃. The mass fraction of carbon dissolved in the matrix of the steel quenched at 840℃ is 0.38, but when the quenching temperature is increased to 1150℃, it increases to 0.98. The carbides formed during sintering are still present at grain boundaries and in the matrix of the steel quenched at low quenching temperatures, such as 840℃. When the quenching temperature is increased to 1150℃, most of the carbides at grain boundaries are dissolved with just a small amount of spherical M23C6 existing in the matrix of the quenched steel. 相似文献
73.
Shuang Kuang) Yong-lin Kang) Hao Yu) Ren-dong Liu) ) School of Materials Science Engineering University of Science Technology Beijing Beijing China ) Technology Center Anshan Iron & Steel Group Corporation Anshan China 《北京科技大学学报(英文版)》2009,16(4):393-398
A more accurate estimation of stress-strain relationships for martensite and ferrite was developed, and the modified law of mixture was used to investigate the stress-strain partitioning of constituent phases in dual phase (DP) steels with two different martensite volume fractions. The results show that there exist great differences in the stress-strain contribution of martensite and ferrite to DP steel. The stress-strain partitioning coefficient is not constant in the whole strain range, but decreases with... 相似文献
74.
Hong Zhang) Xiao-gang Li) Cui-wei Du) Hui-bin Qi) ) School of Materials Science Engineering University of Science Technology Beijing Beijing China ) Institute of Welding Surface Technology Baoshan Iron & Steel Co. Ltd. Shanghai China 《北京科技大学学报(英文版)》2009,16(4):414-421
The corrosion behavior and mechanism of hot-dip galvanized steel and interstitial-free (IF) substrate with alkaline mud adhesion were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and linear polarization. The results show that non-uniform corrosion occurs on the galvanized steel and IF substrate during 250 h with the mud adhesion. The corrosion products on the galvanized steel are very loose and porous, which are mainly ZnO, Zn5(OH... 相似文献
75.
Ji-ping Chen) Yong-lin Kang ) Ying-min Hao) Guang-ming Liu) Ai-ming Xiong) ) School of Materials Science Engineering University of Science Technology Beijing Beijing China ) The State Key Laboratory for Advanced Metals Materials China ) Steel Research Institute of Shougang Beijing China 《北京科技大学学报(英文版)》2009,16(5):540-548
A Ti+Nb bearing ultra-low carbon bake hardening sheet steel hot-rolled in the conventional austenite region and in the ferrite region with lubrication was experimentally studied.Subsequent cold rolling and continuous annealing processes were also conducted.The results show that microstructures of ultra-low carbon bake hardening hot strips at room temperature are basically irregular polygonal ferrites.The yield strength,ultimate tensile strength,n value,and r value of the No.2 specimen hot-rolled in the ferr... 相似文献
76.
Research on indoor experimentation of range SAL imaging system 总被引:1,自引:0,他引:1
GUO Liang XING MengDao ZHANG Long TANG Yu & BAO Zheng State Key Laboratory of Radar Signal Processing Xidian University Xi’an China Xi’an Polytechnic University Xi’an 《中国科学E辑(英文版)》2009,52(10):3098-3104
By means of advantages of both SAR and lidar, the combination of the techniques of (inverse) synthetic aperture and lidar makes it possible to obtain high resolution 2-D image. In this paper, an indoor experimental system of inverse synthetic aperture lidar imaging is given and a processing approach is presented. The given system is in the mode of lidar system with separated receiver and transmitter, which can effectively eliminate the jamming from the lens or/and the intersection between two optic fibers. ... 相似文献
77.
Liu Guangzhi 《西部探矿工程》1997,(6)
RESEARCHANDDEVELOPMENTOFDOWN┐THE┐HOLEHAMMERINCHINALiuGuangzhi(ChinaCoordinator,CC-4Group,ILP;MemberofChinaAcademyofengineerin... 相似文献
78.
THEPRINCIPLEOFDIAMONDDRILLINGLiShizhongChinaUniversityofGeosciences,Beijing,100083,ChinaTHEPRINCIPLEOFDIAMONDDRILLINGLiShizho... 相似文献
79.
ANODIC OXIDATION OF THIOSULFATE IONS IN GOLD LEACHING 总被引:1,自引:0,他引:1
Oneofthemainproblemsconcerninggoldextractionwiththiosulfateisthatthiosulfateisunsta'bleandinclinedtobedecomposedbyoxidation,whichleadstoitshighconsumption.AmericanresarcherKerleygotpatents["'jforaddingsulphiteasstablizingagent,buthisdetailedreportisnotyetavailable.Ourstudiesshowthatsulphiteisofnonoticeableeffectonimprovingthestabilityandreducingtheconsumptionofthiosulfate,whiletheeffeetofammonismuchmoresignificant.Therefore,investigationontheregularitiesofanodicoxidationofthiosulfateisimportan… 相似文献
80.
IntroductionMany aerodynandc configurations include cavities asan integral part of design, manufactUre and performance.Examples of such configurations include landing-gearwells, bomb bays and junctions between surfaces, to namea few. Cavity phenomena can also be observed on a muchlarger scale, for example, around the channel gates orharbor entrances [l][2]. Flow past a cavity is oftencharacterized by unsteady velocity and density, andfurthermore by unsteady pressure fluctuation (oftenreferred… 相似文献