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

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    , Volume 24 Issue 6 Previous Issue    Next Issue
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    PHASE TRANSFORMATION UNIT OF BAINITIC FERRITE AND ITS SURFACE RELIEF IN LOW AND MEDIUM CARBON ALLOY STEELS
    YU Degang;CHEN Dajun;ZHENG Jinghong;HE Yirong;SHEN Fufa Shanghai Jiaotong University
    Acta Metall Sin, 1988, 24 (6): 379-385. 
    Abstract   PDF (2162KB) ( 851 )
    The lath-or plate shaped bainitic ferrite of low and medium carbonalloy steels consists of packets of ferrite sublaths which are composed of manyfiner and regular ferrite blocks. They are uniform shear growth units of bainiticferrite phase transformation. No carbide is precipitated from them. The bainitic θ-carbides are precipitated from γ-α interface or carbon-rich austenite. The mode ofarrangement of the units in ferrite sublath packet is in uni- or bi-direction. Singlesurface relief is produced by the accumulation of uniform shear strains of all theferrite units arranged unidirectionally in a sublath packet, while tent-shaped surfacerelief is formed by the integration of the uniform shear strains of two groups withferrite units piling up in two-directions growing face to face; whereas if they growback to back, the integration will be responsible for inverttent-shaped surfacerelief. The interface trace between two groups of ferrite units in a sublath packetis shown as "midrib".
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    EFFECT OF AGING ON HYDROGEN EMBRITTLEMENT SUSCEPTIBILITY OF STEEL Cr21Ni6Mn9N
    LIU Jianchao;GUO Yunyi (Y. Y. KUO);XING Zhongshu;SHI Changxu (C. H. SHIH);LIANG Wubiao Institute of Metal Research; Academia Sinica; Shenyang; No.2 Automobile Factory; Shiyan
    Acta Metall Sin, 1988, 24 (6): 386-391. 
    Abstract   PDF (2090KB) ( 682 )
    Effects of 650℃ aging for 1-1000h on structure and hydrogenembrittlement susceptibility (HES) of steel Cr21Ni6Mn9N have been investigated.The results show that M_(23)C_6 type carbide precipitates at grain boundaries and Cr-depletive region creates beside them during aging. The precipitates grow and connecteach other as the aging time prolongs, meanwhile, the degree of Cr-depletion aggra-vates first and then recovers gradually while the aging time is very long, i. e.,1000h. The HES of the steel increases with increasing aging time but dose notreduce with the recover of Cr content at the Cr-depletive region. That implies theexisting of carbides at grain boundaries might be the main reason which promotesthe HES of steel during aging.
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    STRAIN-INDUCED ISOTHERMAL PRECIPITATION OF Nb, V AND Ti CARBONITRIDES IN MICROALLOYED STEELS DURING CONTROLLED ROLLING
    XU Wenchong;MA Xiang;SUN Fuyu;ZONG Guisheng Central Iron and Steel Research Institute; Ministry of Metallurgical Industry; Beijing
    Acta Metall Sin, 1988, 24 (6): 392-398. 
    Abstract   PDF (768KB) ( 642 )
    The strain-indueed isothermal precipitation and the law of coarseningof Nb, V and Ti carbonitrides in Nb-steel, V-steel, Nb-V-steel and Ti-V-Nb-steelhave been investigated by means of STEM, EDAX, a new extraction replica tech-nique and quantitative phase analyses method.
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    DYNAMICS OF PRECIPITATION AND TRANSFORMATION OF CARBIDES IN A Ni-BASE SUPERALLOY
    HUANG Qianyao;SHI Yanyu Central Iron and Steel Research Institute; Ministry of Metallurgical Industry; Beijing
    Acta Metall Sin, 1988, 24 (6): 399-403. 
    Abstract   PDF (414KB) ( 784 )
    The quantitative analytical method connecting the electrolyticextraction to X-ray diffraction analysis to determine the carbides and TCP in a Ni-base superalloy was developed. The alteration of decomposition of MC and precipi-tation of M_(23) C_6 and M_6 C with hot-exposure time under 850—1000℃ is shown ashyperbolic pattern. The elemental constitution of M_(23) C_6 changes continuously underhot exposure, (Cr_(0.67)Mo_(0.13)Ni_(0.13)Co_(0.07))_(23)C_6 precipitates from the beginning and (Cr_(0.88)Mo_(0.07)Ni_(0.03)Co_(0.02))_(23)C_6 On the end with the contents in increasing Cr and decreasingMo, Ni and Co. The higher the hot exposure temperature, the faster the final con-stitution of M_(23)C_6 may be easily achieved.
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    EFFECT OF ALLOYING ELEMENTS ON γ′SOLVUS TEMPERATURE OF Ni-BASE SUPERALLOYS
    MA Huazheng;ZENG Bingsheng;ZHANG Anning Central Iron and Steel Research Institute; Ministry of Metallurgical Industry; Beijing
    Acta Metall Sin, 1988, 24 (6): 404-409. 
    Abstract   PDF (1242KB) ( 794 )
    38 Ni-base experimental alloys were prepared with variation of thealloying elements over the following nominal ranges (in wt-%): Al 1.0--6.5, Ti0.0--5.5, W 0.0----11.0, Mo 0.0--8.0, Nb 0.0--4.5, Ta 0.0--4.0, V 0.0--1.3 andFe 0.0--9.0. In this investigation, γ' solvus temperature of these alloys were mea-sured and the effect of alloying elements were discussed. Relationship between γ'solvus temperature and alloy composition has been determined using regressionanalysis. The γ' solvus temperatures calculated by using this simple linear equationagree basically with those observed in 13 commercial Ni-base superalloys.
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    ELECTRONIC STRUCTURE OF γ′-PHASE IN SUPERALLOY CONTAINING Mg AND W
    ZHU Kai;WANG Chongyu University of Science and Technology of China; Hefei Central Iron and Steel Research Institute; Ministry of Metallurgical Industry; Beijing
    Acta Metall Sin, 1988, 24 (6): 410-414. 
    Abstract   PDF (334KB) ( 572 )
    The calculation of electronic structure of γ'-Ni_3 Al phase with orwithout Mg and W by the Recusion and LCAO mehtods clarified that Mg and Watoms lose their outer electrons partially after they entered γ'-Ni_3 Al. It causes thereduction of the radii of atoms (so it is preferable for Mg atom to enter γ' phase bythe substitution). Thus, the interaction between Mg and γ'-phase matrix may bestrengthened and a more stable structure of γ'-phase may be formed while Mg andW entered simultaneously γ'-Ni_3 Al.
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    ELECTRON MICROANALYSIS FOR LASER MELTED ZONE IN 45 STEEL WITH Fe-Ni-Cr COATING
    Cheng Yongxing;LI Genfu;YU Shaoluo;WANG Huimin Shanghai University of Engineering and technology NO. 11 Institute of China State Shipbuilding Corp.; Shanghai Manuscript received 29 July; 1987; revised manuscript 3 January; 1988
    Acta Metall Sin, 1988, 24 (6): 415-418. 
    Abstract   PDF (686KB) ( 520 )
    In this paper the Fe-Ni-Cr coated layer has been alloyed with 45steel base metal by transverse flow type CO_2 gas laser with maxmum output of5 kW. The characteristics of the melted zone and the essence of the "bright band"has been investigated using the electron microscopy. The results show that the"bright band" belongs to the melted zone and is a vertical section of the planecrystal. The width of the "bright band" equals the height of the plane crystal,which decreases with the increase of laser beam scanning rate and the decrease oflaser power. This has been explained in terms of constitutional supercooling G/R.
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    THERMAL FATIGUE AND FRACTURE MECHANICS ANALYSIS OF GREY CAST IRON
    GUO Chengbi;ZHOU Weisheng Dalian Institute of Technology Liaoning
    Acta Metall Sin, 1988, 24 (6): 419-425. 
    Abstract   PDF (987KB) ( 871 )
    The in-phase and out-of-phase therznal fatigue, the C-P type and P-Ctype isothermal fatigue of grey cast iron were experimentally studied. The fatiguelife was evaluated analytically by using the elastic-plastic fracture mechanics method(mainly J integral). The results of experiments and calculations showed that thelife of in-phase and C-P type fatigue are longer than that of out-of-phase and P-Ctype fatigue respectively within the same strain range. This is in contrast toresults of other materials such as low carbon steel. On the other hand, the predicted life are consistent with experimental results. This suggests that J integral asa mechanics parameter for characterizing the thermal fatigue strength of grey castiron and the mechanics model and calculation method developed here are efficient.A parameter △W_t was proposed from energy aspect to characterize the capacityof crack propagation. The isothermal fatigue life is the same as the thermal fatiguelife for identical △W_t values.
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    MEASUREMENT OF K_(IC) OF MEDIAN OR LOW STRENGTH STEEL USING ROUND BARS WITH CIRCUMFERENCIAL CRACK
    LIU Zaihua;ZHAO Dongli Huazhong University of Science and Technology; Wuhan Bureau of Complete Sets of Equipment; State Machinery Commission; Beijing Manuscript received 26 January; 1984; revised manuscript 22 August; 1987
    Acta Metall Sin, 1988, 24 (6): 426-431. 
    Abstract   PDF (827KB) ( 576 )
    The size effect of tension round bars with circumferencial crack wasdescribed and used to measure the planestrain fracture toughness K_(IC) of median orlow strength steel. The size of cylindrical specimen. required for K_(IC) measurement ismuch smaller than that of standard specimen. The J-integral values of the cylin-drical specimens were calculated to characterize the size effect. The finite elementcalculation and fracture morphology analysis have been conducted to explain thefact that smaller cylindrical specimen could be used to measure K_(IC) of median orlow strength steel.
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    CRITICAL NOTCH (CRACK) SIZE AS A CHARACTERISTIC PARAMETER OF CRYOGENIC BRITTLENESS IN LOW CARBON STEEL
    LI Daoming;YAO Mei Harbin Institute of Technology Manuscript received 7 March; 1987; revised manuscript 5 January; 1988
    Acta Metall Sin, 1988, 24 (6): 432-438. 
    Abstract   PDF (888KB) ( 713 )
    The effect of notch depth on the low-temperature fracture behaviorof a low carbon steel has been studied. An analysis was made for the fracturefeatures at T_c~* (cryogenic brittleness-characteristic temperature) at which the fractureload reaches a valley value. Furthermore, according to the experimental resultsand engineering design practice, a concept of criticai notch (crack) size for cryogenicbrittleness, a_c, as well as its limit Value, a_c~*, was put forward and recommendedto be a basic characteristic parameter for controlling the brittleness. Mathematicalderivation was carried out to give the expression of a_c and a_c~*, the reliability ofwhich was verified by the modeling tests under both static and cyclic loadingconditions.
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    FATIGUE/CREEP INTERACTION FRACTURE MAP AT VARIOUS TEMPERATURES
    ZHANG Hongxue;XU Zhichao;CHEN Gaoliang Beijing University of Iron and Steel Technology
    Acta Metall Sin, 1988, 24 (6): 439-442. 
    Abstract   PDF (686KB) ( 570 )
    The relative ratio of fatigue resistance to creep resistance of materialsvaries with test temperature. As the temperature decreases, the creep resistance,since it is a thermal activation process, becomes relatively larger than fatigueresistance. The fatigue damage therefore becomes predominant, and results inexpansion of fatigue fracture region (F region) and shrinkage even complete elimina-tion of creep fracture region (C region). This phenomenon could be understood onthe basis of the integrated model of competitive and eumulative models of fatigue/creep interaction. A material parameters, Ω, can be used to estimate the temperatureat which the creep fracture region is completely depressed.
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    TEM OBSERVATION OF ION-PLATED Al FILM ON Ni SUBSTRATE
    WAN Lijun;CHEN Baoqing;GUO Kexin Dalian Maritime University Dalian Institute of Technology K. H. Kuo Institute of Metal Research; Academia Sinica; Shenyang
    Acta Metall Sin, 1988, 24 (6): 443-446. 
    Abstract   PDF (1135KB) ( 600 )
    A new phase is found at the interface between Al film and Ni substrate when thetime of ion-plating has come to 5 min. And it is identified to be body centered tetragonal latticewith the constants a=b=0.588 nm, c=0.480 nm. The varieties of the microstractures and phases withthe ion-plating time are observed. Based on these results, the ion-plating film formation mechanismis also discussed.
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    IN SITU OBSERVATION OF LOWER BAINITIC CARBIDES PRECIPITATION
    KANG Mokuang;SUN Jialin Northwestern Polytechnic University; Xi'an Manuscript received 16 December; 1987
    Acta Metall Sin, 1988, 24 (6): 447-449. 
    Abstract   PDF (892KB) ( 538 )
    The lower bainitic carbides precipitation in 40CrMnSiMoV steel previouslyaustempered at 310℃ was observed in situ under high temperature stage on high voltage TEM.The typical lower bainitic carbides can precipitate from within bainitic ferrite tempered attemperature higher than isothermal transformation for certain period. It revealed that the lowerbainitic ferrite is supersaturated with C. The carbides may also precipitate from austenite, butthey have no typical feature ofthe lower bainitic carbides.
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    IN SITU TEM OBSERVATION OF MICROSTRUCTURES OF AUSTENITIC-0.45%C STEELS WELD JOINT
    PAN Chunxu;SHI Yuxiang;WANG Renhui;GUI Jianian Wuhan University Manuscript received 30 November; 1987; revised manuscript 18 March; 1988
    Acta Metall Sin, 1988, 24 (6): 450-452. 
    Abstract   PDF (968KB) ( 601 )
    The structural alteration from weld metal, weld bond to heat affected zone of aCr18Ni13 austenitic-0.45%C steels weld joint was successively observed in situ under TEM. Theirmorphologies and compositions were also analyzed. A new type of microstructure called pearlite-like was found. The differentiation of characteristics into various zones across the weld joint isfeatured by TEM photos in contrast to the conventional metallographs.
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    SHAPE MEMORY EFFECT OF POLYCRYSTALLINE Fe-Mn-Si ALLOYS
    ZHAO Qinghua;TAN Shusong Central South University of Technlogy; Changsha
    Acta Metall Sin, 1988, 24 (6): 453-456. 
    Abstract   PDF (707KB) ( 668 )
    The influence of quenching temperature on the shape memory effect (SME) of theFe-Mn-Si polycrystalline alloys and their martensitic transformation temperature have beenstudied. The SME of the hot rolled alloy specimen may be remarkably raised by selected quench-ing temperature, namely, 600--800℃. It is influenced not only by the distribution of ε-phasemorphology but also by its pre-existence.
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    MODELING STUDY OF CONVECTION AND CONSTITUTION VARIATION IN INGOT DURING SOLIDIFICATION
    JIE Wanqi;ZHOU Yaohe Northwestern Polytechnical University; Xi'an
    Acta Metall Sin, 1988, 24 (6): 457-462. 
    Abstract   PDF (486KB) ( 583 )
    Convection and constitution variation of liquid metal during solidifi-cation has been studied using NH_4Cl agueous solution. The liquid in mushy zoneattached to the side wall of the mold will flow upward and forms a low concen-tration region, in which no significant convection occurs, on the top of liquidzone. This region develops downward gradually during solidification. Addition ofadequate component may suppress the formation of this region.
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    ELECTROCHEMICAL STUDIES ON ANODIC DISSOLUTION OF SYNTHETIC NICKEL SULPHIDES
    FANG Zhaoheng;CHEN Jiayong Institute of Chemical Metallurgy; Academia Sinica; Beijing
    Acta Metall Sin, 1988, 24 (6): 463-470. 
    Abstract   PDF (643KB) ( 499 )
    The anodic behaviours of synthetic nickel sulphides in H_2SO_4 solutionwere studied. When the anodes of Ni_3S_2, Ni_7S_6 and NiS are actively dissolved respec-tively, a solid layer is formed on the electrode surface with its nature and com-position depend on the applied potential. Based on the electrochemical Phenomena,phase and elemental compositions of the solid layer formed on the electrode surfacewere determined. The apparent number of electrons transfered during dissolution ofone Ni~(2+) was also measured. It can be considered that there are three parallel reac-tions occurred on the electrode: the reaction with formation of HSO_4~- or SO_4~(2-), thereaction with formation of sulphides as intermediates and the reaction of formingelemental S. With NiS_2, as an anode, formation of SO_4~(2-). or HSO_4~- can be consider-ed as the only reaction ocurred on the electrode.
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    GROWTH OF SHORT CRACKS OF A537CL1 STEEL UNDER FATIGUE LOADING IN 3.5% NaCl SOLUTICN
    PEI Hongxun;YANG Jingjun;KE Wei Institute of Corrosion and Protection of Metals; Academia Sinica; Shenyang
    Acta Metall Sin, 1988, 24 (6): 471-475. 
    Abstract   PDF (422KB) ( 565 )
    The effects of environmental media, both in atmosphere and in 3.5%NaCl aqueous solution, on the growth of short cracks in comparison with thelong ones have been investigated under fatigue loading on the specimens of single-edge crack about 0.05--0.15 mm for A537CL 1 steel. The growth rate of short cracksis faster than those of long ones around the threshold stress intensity. The thresh-old stress intensity for short crack growth decreases with decreasing crack length.The acceleration effect of the salt water, as compared with atmosphere environ-ment, on the growth of short cracks under fatigue is much greater than that on thegrowth of long cracks.
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    ON THE MICROSTRUCTURES OF MILD STEELS AND CORROSION FATIGUE
    XING Zhiqiang;HUANG Shuju;SONG Yujiu; TU Mingjing Xi'an Jiaotong University
    Acta Metall Sin, 1988, 24 (6): 476-481. 
    Abstract   PDF (1287KB) ( 666 )
    The fatigue crack propagation behaviour of two mild steels with vari-ous microstructures in 3.5% NaCl solution or atmosphere was studied. It is revealedthat the microstructures of steel and frequency have considerable influence on thecorrosion fatigue strength. The relation between crack closure effect and electroche-mical conditions is discussed. The corrosion fatigue mechanisms, which considerthe effect of hydrogen embrittlement and anode dissolution respectively, are pro-posed. A fracture mechanism-map is worked.
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    MICROSTRUCTURE AND LOCALIZED CORROSION RESISTANCE OF DEFORMED 18-5-Nb DUPLEX STAINLESS STEEL
    ZHAO Pu;LU Shiying Central Iron and Steel Research Institute; Ministry of Metallutgical Industry; Beijing
    Acta Metall Sin, 1988, 24 (6): 482-486. 
    Abstract   PDF (1106KB) ( 697 )
    The SCC susceptibility of the plastically predeformed 18-5-Nb duplexstainless steel to localized corrosion was evaluated in Both 25% NaCl+1% K_2Cr_2O_7and 42% MgCl_2 Boiling solutions. The γ-phase in the steel is metastable at roomtemperature and the γ-α′martensitic transformation can be induced by cold plasticdeformation. With the increase in deformation, the volume fraction of α′marten-site increases while the pitting resistance of the alloy decreases. Cold plastic defor-mation results in a remarkable deterioration of SCC resistance of the steel inchloride solutions, resulting from the decrease in corrosion resistance of γ-phasein the duplex. It is indicated that, in NaCl solution, SCC in 18-5-Nb duplexstainless steel initiates at pits and the selective attack on the γ-phase plays asignificant role in the initiation and development of SCC.
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    UNUSUAL SOLIDIFICATION MICROSTRUCTURE OF Fe_(70)Cr_(18)Mo_2Si_1B_9 SINGLE-ROLL QUENCHED RIBBON
    LIN Yijian;YOU Yunlong;ZHANG Xiaomin;JING Chunyong;YU Quanqin Shanghai Iron and Steel Research Institute
    Acta Metall Sin, 1988, 24 (6): 487-493. 
    Abstract   PDF (1413KB) ( 622 )
    The solidification microstructure of Fe_(70)Cr_(18)Mo_2Si_1B_9 single-roll quench-ed ribbons with different rotating speed of roller and under different atmosphereconditions was investigated. Apart from usual crystallization by homogeneous andheterogeneous nucleation, it was found that α-iron columnar grains with strongpreferred orientation formed beneath free surface and that spheres of α-iron singlecrystal with a size of several μm up to 20 μm, which have rarely been reported,appeared inside the ribbons. There was experimental evidence suggesting that clust-ers of metal atoms formed from fluctuation in early undercooled liquid might playa role as pre-existed nuclei and, in fact, control. the formation of amorphous forthis alloy.
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    论文
    METASTABLE CHARACTERISTICS OFβ-W
    HUANG Huimin;CHEN Xinmin Central South University of Technology; Changsha
    Acta Metall Sin, 1988, 24 (6): 494-498. 
    Abstract   PDF (372KB) ( 717 )

    The nature of the oxygen contained in β-W was investigated withDSC, X-ray analysis on quenched samples and Auger spectroscope. It was shownthat the oxygen contained in nonpyrophoric β-W consists of the reversiblychemisorbed oxygen and the interstitial oxygen which could form an interstitialsolid solution with β-W. It seems better to consider β-W to be a metaphase of Wwith theinterstitial oxygen as stabilizer.

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    MICROSTRUCTURES AND PROPERTIES OF SiC_w/Al COMPOSITES
    GUO Shuqi;HAN Guihuan;YAO Zhongkai Harbin Institute of Technology
    Acta Metall Sin, 1988, 24 (6): 499-504. 
    Abstract   PDF (1895KB) ( 747 )
    This paper presents an investigation on the microstructures and prop-erties of the 17V.-% SiC_w/ZL109Al composites. TEM observations and EDAX ana-lysis revealed that aluminium diffuses into the SiC whiskers and that dislocationsexist at the whisker/matrix interfaces. Tensile test results showed that the isother-mal exposure and thermal cycle at both 573K and 733K caused the UTS reductionof the composites, the reduction in UTS due to thermal exposure at 733K beingmuch more significant than that due to thermal cycle at the same temperature.The SiC_w/ZL109Al composites were also found to have exellent wear resistance,which does not seem to vary much with the volume content of whiskers in therange of 11--17%.
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    STUDY OF HYDROGEN DISTRIBUTION AND DIFFUSION BEHAVIOUR IN HIGH PRESSURE HYDROGEN CHARGED AUSTENITIC STEEL BY IMMA
    MA Luming;LI Yiyi;LIU Shuwang;CHEN Lian Institute of Metal Research; Academia Sinica; Shenyang
    Acta Metall Sin, 1988, 24 (6): 505-510. 
    Abstract   PDF (446KB) ( 607 )
    The hydrogen distribution curve along cross-section of austenitic steel21Cr-7Ni-9Mn-N was obtained quantitatively by IMMA (Ion Microprobe MassAnalyzer) with high pressure hydrogen charging specimen. Thus, the hydrogen sol-ubility and diffusivity may be measured as well as the hydrogen permeability andother parameters may be calculated indirectly. The hydrogen distribution in speci-mens either long-term aged in air or electron beam weld seam after high pressurehydrogen charged was also examined.
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    DYNAMIC SEGREGATION OF SULPHUR IN CAST IRON
    QIN Ziqiang;YU Zongsen Beijing University of Iron and Steel Technology
    Acta Metall Sin, 1988, 24 (6): 511-513. 
    Abstract   PDF (814KB) ( 616 )
    The segregation of sulphur at iron/graphite interfaces in both grey and nodular ironwas investigated with AES. Sulphur was found to nonequilibratorily segregated at the interfaces ingrey iron, but not in nodular iron. Such different behaviors of segregation, which will exaggeratethe difference of grey and nodular iron in sulphur content at ircn/graphite interfaces, might bederived from the difference of solidification process between the two irons.
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    A NEW KOSSEL ORIENTATION METHOD OF CRYSTAL
    HUANG Rong;WANG Guanying Shanghai Institute of Metallurgy; Academia Sinica Manuscript received 18 October; 1987; revised manuscript 21 December; 1987
    Acta Metall Sin, 1988, 24 (6): 514-517. 
    Abstract   PDF (528KB) ( 532 )
    A new Kossel orientation method of crystal is developed. The distances among threeintersections of the Kossel lines on the indexed Kossel pattern observed are only necessary oforientation. Thus, the crror may be eliminated and the orientation preoision may be improved to±0.3°.
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    LOCAL EQUILIBRIUM METHOD IN STUDYING PHASE DIAGRAM OF Mn-MnO SYSTEM
    CHEN Qiyuan Central South University of Technology; Changsha
    Acta Metall Sin, 1988, 24 (6): 518-520. 
    Abstract   PDF (205KB) ( 575 )
    A special method based on the local equilibrium principle has been introduced inthe research of the phase diagram of Mn-MnO system. With this method, the difficulties of vol-atilization of Mn and the corrosion of Mn and MnO to refractory material were avoided. Thesolubility of oxygen in Mn and the composition of the interface between MnO and Mn weredetermined. Parts of the phase diagram of Mn-MnO system were constructed according to exper-imental results.
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    BEHAVIOUR OF Co_5 Cr_3 Si_2 PHASE IN Cu-RICH ALLOYS CONTAINING Co, Cr AND Si
    ZHUANG Yinghong Guangxi University; Nanning
    Acta Metall Sin, 1988, 24 (6): 521-523. 
    Abstract   PDF (617KB) ( 597 )
    The major phases in the Cu-rich alloys containing Co. Cr and Si are α-Cu (asolid solution of Co. Cr and Si in Cu). X-phase (Co_5Cr_3Si_2) and Co_2Si. In comparison with ref-erence sample, it was detected that the Co_5Cr_3Si_2 is of cubic system, α-Mn type and α=0.8694nm. The melting temperatures of X-phase and the alloy are higher than that of pure Cu. name-ly, 1535 and 1389 K respectively. During aging treatment, the Co_2Si phase precipitates out fromα-Cu and X-phase simutaneously, but the hardening effect is mainly contributed by the precipi-tation from α-Cu.
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    EQUILIBRIUM OF Mg-S IN Ni MELT
    WANG Conghua;HAN Qiyong Beijing University of Iron and Steel Tehnology
    Acta Metall Sin, 1988, 24 (6): 524-526. 
    Abstract   PDF (210KB) ( 640 )
    The equilibrium of Mg-S in Ni melt was studied by the mehtod of vapour equilib-rium in a sealed Chamber At 1530℃, the equilibrium constant of the reaction MgS_(s)=Mg_(Ni)+S_(Ni)and the activity interaction coefficient were determined as K_(Mgs)=6.76×10~(-5) and e_(s)~(Mg)=-9.09.
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    INTERACTION BETWEEN C AND Sb IN Fe-C-Sb LIQUID SOLUTION
    ZHOU Qianli;DU Ting Central Iron and Steel Research Institute. Ministry of Metallurgical Industry; Beijing
    Acta Metall Sin, 1988, 24 (6): 527-529. 
    Abstract   PDF (205KB) ( 462 )
    The influence of Sb on the C solubility in liquid Fe was determined under 1300,1400 and 1500℃. The C solubility decreases with the increase of Sb content. The temperaturedependences of the first order interaction coefficients in C-saturated liquid Fe are:*e_c~(sb)=11. 309/T+0.0025*e_(sb)~c=128.023/T-0.0219The temperature dependences of interaction coefficients between Sb and C in dilute liquid Fe are:e_c~(sb)=14.204/T+0.025e_(sb)~c=120.541/T+0.227ε_c~(sb)=ε_(sb)~c=6026. 75/T+11.958The interaction coefficients at 1600℃ are *e_(c)~(sb)=0.0085, e_(c)~(sb)=0.033, e_(sb)~c=0.295, ε_c~(sb)=ε_(sb)~c=15.36.The first order interaction coefficients vary slightly with temperature.
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