Acta Metallurgica Sinica
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ISSN 0412-1961
CN 21-1139/TG
Started in 1956
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Current Issue
, Volume 31 Issue 22
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MATHEMATICAL AND PHYSICAL MODELING OF FLOW AND MIXING IN LADLES STIRRED BY ARGON THROUGH MULTI-TUYERE
ZHU Miaoyong; (Department of Ferrous Metallurgy; Northeastern University;Shenyang 110006) INOMOTO Takeo; XIAO Zeqiang(Northeastern University; Shenyang 110006)(Nippon Steel Corporation; Futtsu; Japan)
Acta Metall Sin, 1995,
31
(22): 435-439.
Abstract
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(411KB) (
626
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Mathematical modeling and physical modeling have been conducted to investigate the characteristics of fluid flow and mixing in argon-stirred ladles with six different types of tuyere arrangement. An optimum arrangement of tuyeres considering the various purposes of refining and an empirical correlation for mixing time concerning the number of tuyeres are proposed. The results of mathematical modeling are in good agreement with those of physical modeling.
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EFFECTS OF PHASE STRUCTURES OF TiNi ON THE ELECTROCHEMICAL PROPERTIES
WANG Chunsheng; (Department of Materials Science and Engineering; Zhejiang University; Hangzhou 310027) LEI Yongquan; YANG Xiaoguang; JIANG Jianjun; WU Jing;WANG Qidong (Zhejiang University; Hangzhou; 310027)
Acta Metall Sin, 1995,
31
(22): 440-444.
Abstract
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(312KB) (
751
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The effects of two different phase structures of TiNi on its electrochemical properties were studied. By utilizing the transformation hysteresis, both TiNi samples with austenite and martensite structure were prepared and tested at the same temperature. The former has better kinetic properties than the later. In this paper the effect of hydrogen dissolved in the alloy to form solid solution on phase transformation temperature was also investigated with the electric resistance method.
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ELECTROCHEMICAL BEHAVIOUR FOR REDUCTION OF Tm~(3+) IN MOLTEN CHLORIDES
YANG Qiqin; (Department of Chemistry; Zhongshan University; Guangzhou 510275) QIU Kairong; LIU Guankun; GUAN Tong(Zhongshan University;Guangzhou 510275)
Acta Metall Sin, 1995,
31
(22): 445-450.
Abstract
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(365KB) (
494
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The electrode processes of Tm3+ in molten chlorides were investigated by cyclic voltammetry, open circuit potential-time curve after potentiostatic electrolysis and X-ray diffraction. Tm3+ is reduced to Tm2+ at first and then the metallic Tm is deposited on the W and Mo electrode respectively. The Tm-Ni alloys are formed at first and then the metallic Tm is deposited on Ni electrode. The diffusion coefficient and diffusion activation energy of Tm3+ in molten chlorides were determined. InD=-4.35-58.2x10~3 /RT is obtained.
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TEMPERATURE DEPENDENCE OF VIBRATION DAMPING CHARACTERISTIC OF LAMINATED DAMPING STEEL SHEET
WANG Chengguo; (Institute for Materials Engineering; ShandongPolytechnic University; Jinan 250014) SUN Xitai; PENG Qifeng(Shandong Polytechnic University; Jinan250014); ZHU Jing; CAI Qigong(Central Iron Steel Research Institute; Ministry ofMetallurgical Industry; Beijing 100081)
Acta Metall Sin, 1995,
31
(22): 451-454.
Abstract
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(295KB) (
678
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The amplitude frequency characteristic curve and loss factor of laminated damping steel sheet have been calculated and measured with the sine scanning excited method. The laminated damping steel sheet using phenolic resin-chloroprene rubber for sandwich possesses good vibration damping characteristic; in the temperature range from 20℃ to 150℃. Its loss factor is over 0.05, the maximum value of loss factor over 0.35.
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ANACYSIS OF HYDROGEN ATTACK ACTIVATION ENERGY AND WELDING SEAM HYDROGENATTACK FOR 15CrMo STEEL
LI Xiaogang; (Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences.Shenyang 110015) CHEN Hua; MENG Qinghai; YAO Zhiming; LI Jin; KE Wei (State Key Laboratory of Corrosion and protection; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences; Shenyang 110015) (Fushun Petroleum Institute; Fushun 113001)
Acta Metall Sin, 1995,
31
(22): 455-459.
Abstract
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(358KB) (
527
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The activation energies of decarburization and hydrogen attack of 15CrMo steel exposed under 18 MPa H2 and at 300, 350, 400, 450 and 500℃ for different time were evaluated. Both activation energies have similar value. This is believed that the hydrogen attack reaction is controlled by the diffusion of C-atom. The hydrogen attack in the welding affected zone is more obvious than that of matrix.
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PROPERTY AND STRUCTURE OF CASTING Al/TiC COMPOSITE
ZHANG Erlin; (Harbin Institute; of Technology; Harbin 150001) ZENG Songyan; ZENG Xiaochun; LI Qingchun(Harbin Institute ofTechnology; Harbin 150001)
Acta Metall Sin, 1995,
31
(22): 460-464.
Abstract
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(452KB) (
651
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The stability of TiC prepared by in situ reaction in molten Al has been confirmed by using SEM and XRD. With the increase of the content of TiC, the structure become finer, the distribution of TiC in matrix becomes more homogeneous and some mechanical properties are improved. The fracture surface observed by SEM is ductile one.
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DYNAMICS OF CuO/Al IN SITU COMPOSITE
KOU Shengzhong; (Faculty of Foundry; Gansu University of Technology; Lanzhou 730050)DING Yutian; XU Guangji; HAO Yuan(Gansu University of Technology; Lanzhou 730050)
Acta Metall Sin, 1995,
31
(22): 465-467.
Abstract
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(235KB) (
592
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An Al2O3 particle reinforced aluminium matrix composite-CuO/Al reaction synthetic in situ composite has been prepared at lower temperature. Heat response of synthectic reaction and microstructure of composite were observed by thermal analysis and scanning electron microscopy.
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GRAIN SIZE PREDICTION AFTER CONTINUOUSLY COOLING TRANSFORMATION FROM DEFORMED AUSTENITE TO FERRITE
LIU Zhenyu; WANG Guodong;(Department of Metal Forming; Northeastem University; Shenyang 110006) ZHANG Qiang (State Key Laboratory of RollingTechnology and Tandem Rolling Automation; Northeastern University; Shenyang110006)
Acta Metall Sin, 1995,
31
(22): 468-172.
Abstract
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(265KB) (
602
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Based on the transformation kinetics and thermodynamics an algorithm for predicting ferrite grain size after continuously cooling transformation from deformed austenite to ferrite was suggested. Calculated results of computer simulation wtih the algorithm are in so good agreement with the measured ones in the pilot experiments, that the theoretical algorithm is feasible.
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SYNTHESIS OF NANOMETER SILICON CARBIDE WHISKERS BY MICROWAVE HEATING
DAI Changhong; (Department of Non-ferrous Metallurgy; Northeastern University; Shenyang 110006) ZHANG Jinsong; YANG Yongjin; CAO Lihua; ZHANGXianpeng; XIA Fei (Northeastern University; Shenyang 110006) (Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015)
Acta Metall Sin, 1995,
31
(22): 473-476.
Abstract
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(310KB) (
460
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A method for synthesizing silicon carbide whiskers by microwave heating is described in this paper. Silicon carbide whiskers with diameter in the range of nanometer have been obtaind by the reduction of SiO2 with C in an atmosphere of nitrogen. Ultrafine SiO2 powder, phenol formaldehyde resin and carbon black are used as starting materials. The structures of the whiskers are determined by means of XRD, TEM. The effects of temperature and carbon type on the production of SiC whiskers are discussed.
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