ISSN 0412-1961
CN 21-1139/TG
Started in 1956

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    , Volume 29 Issue 1 Previous Issue    Next Issue
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    CALCULATION OF BAINIT TRANSFORMATION KINETICS IN Fe-C-Si-Mn ALLOYS
    YANG Liu;LIU Shikai;YANG Ping Southwest Jiaotong University; Chengdu
    Acta Metall Sin, 1993, 29 (1): 1-5. 
    Abstract   PDF (395KB) ( 610 )
    Both regular solution and supper-component models were used to calculatethe driving force for isothermal transformation of Fe-C-Si-Mn alloys. The relativenucleation rate and incubation period were estimated based on the calculated driving force.The results suggest that for carbon-free alloys, the incubation is principally determined by thedriving force, while for carbon-contained alloys, the driving force is not the dominant factor.The result is considered to be in accordance with what is prodicted by the solute drag-like ef-fect (SDLE) theory on the transformation kinetics.
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    INFLUENCE OF Si ON MICROSTRUCTURE AND PROPERTIES OF LOW CARBON BAINITIC STEELS
    ZHANG Mingxing;KANG Mokuang Baotou Institute of Iron and Steel Technology; Noghwestern Polytechnical University; Xian
    Acta Metall Sin, 1993, 29 (1): 6-10. 
    Abstract   PDF (736KB) ( 741 )
    Improvement on strength and toughness of low carbon bainitic steels may bemade by Si addition within a finite content range to increase the relative amount of granularbainite, the volume fraction of M-A island, the amount of retained austenite and its mechani-cal stability. Their strength and toughness may be at its maximum at cooling ratev_t=156℃ /min if 1.62% Si added, and may decrease due to precipitation of a host ofpro-eutectoid ferrite if Si>1.99% at v_t=7.9 and 0.9℃ / min. The peak value of strengthand toughness occurs while the Si content equal to 1.62 or 1.99% respectively. It is believedthat the best Si content is 1.62--1.99% for low carbon bainitic steels.
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    IMPROVEMENT ON COMPLETE ODF DETERMINATION OF CUBIC SYSTEM MATERIALS
    ZHAO Hong;WANG Fu;XU Jiazhen;LIANG Zhide Department of Materials Science and Engineering; Northeast University of Technology; Shenyang
    Acta Metall Sin, 1993, 29 (1): 11-15. 
    Abstract   PDF (320KB) ( 478 )
    Suitable method and relevant software for micro-computer were developedon the basis of revision of the maximum entropy method (MEM) for determining the com-plete ODF of macrostatistical symmetrical cubic system materials. The method was verifiedby testing the complete ODF of the cold-rolled phosphoratic steel sheet, and seemed to be re-liable and practicable.
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    FIXATION OF HYDROGEN BY RARE EARTH IN Al-Si ALLOY
    ZHAO Yuguang;LI Daoyun;WANG Shoushi;HE Zhenming Jilin University of Technology; Changchun
    Acta Metall Sin, 1993, 29 (1): 16-20. 
    Abstract   PDF (1094KB) ( 527 )
    Occurrence of RE hydride was identified in the Al-Si alloy containing RE andenrichment of hydrogen in polynary RE intermetallic compound was determined by means ofEPMA, secondary ion mass spectrography, Hg-free vacuum drivepipe hydrogen-meter to-gether with metallography and porosity measurement. The relative contents of various formsof hydrogen before and after RE added in Al-Si alloy have been qualitatively analysed. Aconcept about firm fixation of hydrogen by RE was suggested. It is believed that the hydrogenfixation is the major cause of reducing free hydrogen content and decreasing hydrogen-in-duced defects.
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    FATIGUE BEHAVIOUR OF NICALON SiC_f/Al COMPOSITE
    WAN Hong;ZHUO Yue State Key Laboratory for Fatigue and Fracture of Materials; Institute of Metal Research; Academia Sinica; Shenyang
    Acta Metall Sin, 1993, 29 (1): 21-24. 
    Abstract   PDF (940KB) ( 476 )
    Tensile-tensile fatigue property (stress ratio R=0.1) of NICALON SiCmultifilaments reinforced Al preform wire was studied. The fatigue performance of the com-posite is superior to that of Al alloy obviously. The fibres breaking during the cycling finallycause the fracture of the composite wire. After exposuring at 600℃, the interface strength in-creases and the fatigue property of the wire decreases.
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    CREEP-FATIGUE BEHAVIOUR OF A Ni-BASE SINGLE CRYSTAL ALLOY DD3 AND ITS LIFE PREDICTION
    SU Hansheng;WU Zhongtang Beijing Institute of Aeronautical Materials
    Acta Metall Sin, 1993, 29 (1): 25-32. 
    Abstract   PDF (1272KB) ( 651 )
    Creep-fatigue behaviour of a Ni-base single crystal alloy DD3 under condi-tion of tension-tension stress was investigated from some concept about strain range parti-tioning (SRP) and strain energy partitioning (SEP). Study of effect of hold time and its quan-titative computation was also made. Using numerical method of SEP (SEP-NCM), creep-fa-tigue life prediction under condition of tension-tension strees was performed.
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    FATIGUE PROPERTIES OF AN Al-Li ALLOY
    AI Suhua;WANG Zhongguang;ZHANG Yun;HU Zhuangqi State Key Laboratory for Fatigue and Fracture of Materials; Institute of Metal Research; Academia Sinica; Shenyang
    Acta Metall Sin, 1993, 29 (1): 33-38. 
    Abstract   PDF (1861KB) ( 671 )
    The room temperature fatigue life of smooth specimens for alloy 8090 hasbeen investigated in natural ageing and artificial ageing conditions. The high temperature fa-tigue properties were also studied at 100--200℃. A parallel study was also made on tradi-tional Al alloys LC4 (artificial ageing) and LY12(natural aging)for comparison. The results showed that the artificially aged state resulted in an increase in fatigue life incomparison with the naturally aged state. As compared with the traditional high strength al-loys LC4 and LY12 both the artificially aged and naturally aged states caused a significantenhancement in fatigue life. The fatigue life reduced markedly with increasing temperature forartificially aged alloy 8090. Though high temperarure fatigue life decreased a little for natural-ly aged alloys 8090 and LY12, there was increasing during 200℃ and 150℃, respectively. The observation of fracture surface demonstrated the fatigue cracks in alloy 8090 mainlyinitiated from the metallurgical defects on surfaces and subsurfaces. It also showed that thecharacter of laminated fracture was more obvious in alloy 8090 than in tranditional alumini-um.
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    AN ATTEMPT TO IMPROVE AMBIENT DUCTILITY OF Ni_3Al BY COMPLEX ALLOYING WITH Mn AND B
    YANG Wenying;LU Fanxiu;ZHANG Shouhua University of Science and Techhology Beijing
    Acta Metall Sin, 1993, 29 (1): 39-42. 
    Abstract   PDF (1351KB) ( 449 )
    An improvement on the room temperature ductility of Ni_3Al was made bycombination of microalloying and macroalloying with Mn and B. The elongation of Ni_3Al,after optimum alloying with B, is 14%, but that of complex alloyed one obtained up to 35%.Furthermore, this superiority of complex alloying seems to be only revealed with equivalentAl, i. e., %Mn+%Al, less than stoichoimetric content.
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    PLASTICITY AND TOUGHNESS OF Ti-24Al-11Nb ALLOY
    WNAG Yandong;YANG Wangyue;CHEN Guoliang;ZHU Shijie University of Science and Technology Beijing; Institute of Metal Research; Academia Sinica; Shenyang
    Acta Metall Sin, 1993, 29 (1): 43-48. 
    Abstract   PDF (1290KB) ( 525 )
    Room temperature plastic properties and notch fracture toughness ofTi-Al-Nb alloy with two microstructures, i. e., basketweave α_2+β and equiaxed α_2 distributed inbasketweave α_2+β respectively, were studied by means of three-point bending test. The plas-tic properties, such as fracture deflection f_(max), fracture strain ε_f and strain energy U, were de-rived from load vs cross-head displacement curves, which were measured by smooth speci-mens of 20×5×2.5 (mm), and notch fracture toughness K_c~R were decided by the same sizesamples, with the notch of 2.5 mm depth and 0.05 mm radius. The experimental resultsshowed that the notched samples of Ti-24Al-11Nb alloys fractured in brittle behaviour inspite of 8.8% fracture strain and the alloy with microstructures basketweave α_2+β has agreater fracture toughness than that with equiaxed α_2 distributed in basketweave α_2+β atthe same ductility level. The influence of the length and radius of notch on fracture toughnessis discussed also.
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    COMPARISON OF METHODS ON EVALUATION AND MEASUREMENT OF NANO-PARTICLES SIZE
    ZHU Jing;LIN Xiwei;GUO Wei;JIA Liping;ZHAO Xiangrong;ZHANG Jinyuan;LIU Chunlan;YE Hengqiang;NING Xiaoguang Central Iorn and Steel Research Institute; Ministry of Metallurgical Industry; Beijing Laboratory of Atomic Imaging of Solid; Institute of Metal Research; Academia Sinica; Shengyang
    Acta Metall Sin, 1993, 29 (1): 49-58. 
    Abstract   PDF (2814KB) ( 771 )
    Method of TEM compositive anlysis-dispersion for measuring nano-particlesize is reviewed. Comparison of methods between this and of X-ray small angle scattering aswell as of TEM in dark field was carried out by experiments and anlyses. It is believed thatcombination of X-ray small angle scattering and TEM compositive analysis-dispersionmethod is the more rapid, accurate and comprehensive way to evaluate and measure thenano-particle size.
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    CONSTANT PRESSURE MOLECULAR DYNAMICS SIMULATION OF MOLTEN LiF-BeF_2 SYSTEM
    SHAO Jun;XU Hua;CHENG Ailan;KLEIN M. L. University of Pennsylvania; Philadelphia; U. S. A; State University of New York; U. S. A.; University of Pennsylvania; Philadelphia; U. S. A.
    Acta Metall Sin, 1993, 29 (1): 59-64. 
    Abstract   PDF (476KB) ( 684 )
    The constant pressure molecular dynamics calculations were carried out formolten LiF-BeF_2, LiF-2BeF_2 and LiF-3BeF_2 systems. The radial distribution functionswere analyzed along with the coordination numbers and the mean bond lengths. The diffu-sion coefficients and the velocity auto-correlation functions have been examined. One of themost significant results is that the high concentration of Li~+ ion in the LiF-BeF_2 melt facili-tates the breakdown of the network structure, which exists in BeF_2 system, and makes thesystem more fragile.
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    DISSOLUTION EQUILIBRIUM OF Bi VAPOUR IN LIQUID Fe AND INFLUENCE OF Ni AND Mn
    XU Jianlun;CHEN Jikai;JIANG Guochang;SONG Bo;HAN Qiyong Shanghai University of Science and Technology; University of Science and Technology Beijing
    Acta Metall Sin, 1993, 29 (1): 65-68. 
    Abstract   PDF (280KB) ( 575 )
    Studies were made of the dissolution equilibrium of Bi vapour in liquid Fe at1873 K, using vapour-liquid equilibrium method in a sealed Mo reaction chamber, as well asthe influence of a third element Ni or Mn on Bi solubility. The Bi solubility in liquid Fe at1873 K was determined to be 0.16 wt-%, and enhanced by Ni or Mn. The activity interactioncoefficient obtained is: e_(Bi)~(Ni)=-0.20, e_(Bi)~(Mn)=-0. 19.
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    DETERMINATION AND CALCULATION ON Na-Hg BINARY ALLOY PHASE DIAGRAM BY EMF METHOD
    SUN Chengwen;CAO Yongxu Shanghai Institute of Ceramics; Academia Sinica
    Acta Metall Sin, 1993, 29 (1): 69-74. 
    Abstract   PDF (493KB) ( 483 )
    EMF of Na
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    MICROSTRUCTURES AND THERMAL STABILITY OF RAPIDLY SOLIDIFIED Al-RE-Ni ALLOYS
    TONG Xingcun;SHEN Ningfu;MANOV V. P. Zhengzhou Institute of Technology Ural Polytechical Institute; Russia
    Acta Metall Sin, 1993, 29 (1): 75-79. 
    Abstract   PDF (1283KB) ( 628 )
    Al_(87)RE_8Ni_5 and Al_(92)RE_4Ni_4 (at.-%) amorphous alloys with superior bendingductility were produced by melt-spinning in air atmosphere. For the ribbons obtained in 50-60 μm thick, the Al_(87)RE_8Ni_5 alloy was found to be an amorphous structure with no trace ofcrystallinity; whereas, Al_(92)RE_4Ni_4 alloy to be an amorphous phase in the wheel side, anamorphous structure containing finely dispersed α-Al particles, about 5 nm in diameter, inthe ribbon core, and a-Al micrograins structure, with the grain size of 15-25 nm, in the freeside. Amorphous Al_(87)RE_8Ni_5 and Al_2RE_4Ni_4 alloys all possess a very wide temperature spanof the supercooled liquid, △T_x=53 and 83 K respectively, and a distinct glass transition abili-ty with T_g / T_m=0.56 and 0.59 respectively.
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    PRESSURE CHARACTERISTICS AT TIP OF METAL DELIVERY TUBE IN GAS ATOMIZATION
    SHEN Jun;CUI Chengsong;JIANG Zuling;LI Qingchun Harbin Institute of Technology
    Acta Metall Sin, 1993, 29 (1): 80-83. 
    Abstract   PDF (362KB) ( 501 )
    Effect of key operation parameters, such as gas inlet pressure, geometrical de-sign and relative position of metal delivery tube, atomization gas, etc., on the overpressureand / or underpressure in the gas-metal interaction zone at the tip of metal delivery tube ori-fice has been experimentally investigated. It was found that to properly raise the atomizingpressure, to lower the position and to reduce the cone angle of delivery tube may produce anegative pressure at the tip of delivery tube, thus, the aspiration for injection of molten metalwill be more effective. The formation of pressurization and aspiration, as well as the criticalpressure condition for gas atomization process were proposed and discussed.
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    论文
    PREPARATION OF Ti-Ni HYDROGEN STORAGE FILMS BY ION BEAM SPUTTERING
    ZHANG Yunshi;HU Weikang;WANG Da;YUAN Huatang;CHEN Youxiao Nankai University; Tianjin
    Acta Metall Sin, 1993, 29 (1): 84-86. 
    Abstract   PDF (236KB) ( 769 )

    Ti-Ni alloy hydrogen storage films, but particularly amorphous one at roomtemperature, were prepared by ion beam sputtering method with a composite target of Ti andNi plate. The films have superior adhesion to substrate and anti-pulverizability. It was foundthat its hydrogen discharge capacity becomes higher after the amorphous film crystallized byannealing.

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    PLASMA CHEMICAL VAPOUR DEPOSITION OF Ti-N-C FILMS
    ZHAO Cheng;PENG Hongrui;LI Shizhi Qingdao Institute of Chemical Technology
    Acta Metall Sin, 1993, 29 (1): 87-92. 
    Abstract   PDF (962KB) ( 791 )
    Plasma chemical vapour deposited (PCVD) Ti-N-C films with different Cand N contents were examined, in comparison with C-free ones, by XPS, AES, XRD, SEMand microhardness testing. The PCVD Ti-N-C film may attribute its superior wear resist-ance to its high microhardness and dense structure. The variety of valence state of oxygenatoms adsorbed on Ti-N-C or TiN film surface was detected by AES and XPS analyses.Whether or not sufficient C atoms, existing in the lattice of the films seems to be decisive. Dif-ferent states of oxygen adsorbed may cause different modes of abrasive damage of film.
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    RAPIDLY QUENCHED Sm-Fe-N AND ITS RESIN-BONDED MAGNET
    HE Junfang;XU Xiarong;YAO Guolan;ZHAO Hang;ZHAO Fengming;JING Fucheng Institute of Metal Research; Academia Sinica; Shenyang
    Acta Metall Sin, 1993, 29 (1): 93-96. 
    Abstract   PDF (846KB) ( 654 )
    Almost single phase Sm_(2+x)Fe_(17) alloy containing minute α-Fe may be preparedby melt-spun at x=0.7. After ball milling and nitriding, α-Fe is still controlled below 3.0wt-%. The primary phase is intense uniaxial anisotropic Sm_2Fe_(17) at room temperature. Therapidly quenched alloy grains are approaching to mono-domain of high coercity. The bestmagnetic properties obtained are: B_r=0.7 T, H_c=761.0 kA / m, (BH)=45.6 kJ/ m~3,T_c=475℃.
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