最新刊期
      卷 ， 期 2 ， 2005
      • Gao Hongtao Wu Guohua Ding Wenjiang Zhu Yanping
        Issue 2, Pages: 65-67(2005)
        摘要：Effects of the fluxes with different Na2B4O7 contents on the mechanical properties,phase constituent,fracture morphology and corrosion performance of magnesium alloy wastes have been studied by ICP spectroscopy,SEM,XRD,material testing machine and corrosion test.It was found that the Fe in the wastes can be decreased to below 0.004% and the tensile strength and elongation of the alloy can be improved using the fluxes with Na2B4O7.Corrosion test indicated that the corrosion rate of the alloy can be decreased to 0.3 mg·cm-2·d-1 by the flux with 20% Na2B4O7.The SEM and XRD results showed that purification treatment has a slightly effect on the fracture morphology and phase constituent.It was believed that the Fe removal by Na2B4O7 was contributed to the reaction between Fe with B to form a deposited compound.  
        关键词：Mg Alloy;Purification;Flux;Na2B4O7   
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        发布时间：2023-12-18
      • Wang Hui Wang Qiuliang Huang Hui Li Bingle Ma Yanwei Yan Luguang
        Issue 2, Pages: 67-69(2005)
        摘要：Effects of magnetic interaction on stability of magnetic texture in precipitated MnBi phase of Bi-Mn alloy were investigated experimentally.It was found that magnetic interaction among oriented precipitated phases grain can not only sustain the stable existence of magnetic texture structure during temperature redution but also stably exist in solid-liquid phase during solidification with reheating to below the curie point of MnBi alloy without magnetic field.The experimental phenomena was discribed by analyzing magnetic interaction among oriented grains based on the magnetic physical theory.  
        关键词：Metal Solidification;Texture Structure;Magnetic Field;Magnetic Interaction;Precipitated Mn-Bi Phase   
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        发布时间：2023-12-18
      • Yu Jianghao Zhang Peng Du Yunhui Liu Hanwu
        Issue 2, Pages: 70-72(2005)
        摘要：The ratio of Fe-Al compound at interface was used to quantitatively investigate the interface of steel-Al-28Pb semi-solid casting-rolling bonding based on the characteristics of steel-Al-28Pb semi-solid casting-rolling bonding,and the relationship model between ratio of Fe-Al compound at interface and bonding parameters,including preheating temperature of steel plate,solid fraction of Al-18Pb slurry and casting-rolling speed,was established by artificial neural network.The results showed that the ratio corresponding to the largest interfacial shear strength is 71.5%,namely,the reaonable interface consists of 71.5% Fe-Al compound.  
        关键词：Semi-solid Bonding;Interface;Ratio of Fe-Al Compound at Interface   
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        发布时间：2023-12-18
      • Yang Fuliang Gan Weiping Chen Zhaoke
        Issue 2, Pages: 73-74(2005)
        摘要：Cladding-rolling for high Si aluminum alloy ingot with a Si mass fraction of higher than 26% prepared by smelting-casting technology was conducted.Distortion rate of un-cracked modified high-Si aluminum by hot-rolling with multi-times and minor distortion can be more than 60% while the total distortion can be more than 90% by cold-rolling.The microstructures of the alloy under hot-rolling and cold-rolling conditions were analyzed and compared by the OM.It was found that cladding-rolling can efectively prevent crack propagation so that the forming problem in brittle material can be solved.  
        关键词：Electronic Packaging;Modification;Cladding-rolling;Microstructure;Hypereutectic   
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        发布时间：2023-12-18
      • Shu Qun Chen Yuyong Xu Lijuan
        Issue 2, Pages: 75-78(2005)
        摘要：Microstructure and mechanical properties of as-cast and heat treated （T6） ZL205A alloy in sand casting were studied.Phase constituents of as-cast ZL205A alloy were composed of matrix phase of α（Al） solid-solution,of eutectic structure of α（Al）,θ（Al2Cu）,Cr phase in dendrite and grain boundary,and of mixture structure of θ and T(Al12CuMn2) phase on grain boundary as well as a little grey bulk ZrAl3 and strip Al3Ti phase in α（Al） solid-solution.Minor addition of Ti,V,Zr and B into the alloy can significantly refine the grain size.θ phase and Cr phase were dissolved into α（Al） solid-solution and secondary dispersed T phase can be precipitated from the T6 treated alloy.Meanwhile,there exist laminar Al3Ti segregation and retained Al2Cu phase in crystal boundary.The tensile strength of T6 treated alloy with good toughness which is ductile fracture at different temperatures decreases with temperature increase.  
        关键词：Sand Casting;ZL205A Alloy;Microstructure;Mechanical Properties;Tensile Strength   
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        发布时间：2023-12-18
      • Xu Jiping~1 Liao Qiuhui~1 Fu Ziqing~2
        Issue 2, Pages: 78-80(2005)
        摘要：Effects of impurity Fe on electric conductivity of YL102 alloy were examined.It was found that the alloy with low Si content should be selected to produce castings with higher conductivity because of the detriment of Si to the conductivety.Fe content in raw materials should be controlled strictly for the Al alloy castings with higher conductivity due to the increase of Fe content resulting in the decrease in electric conductivity.Additionally,measures must be taken to prevent the alloy from Fe content increase in order to ensure Fe content in YL102 alloy lower than 1%.  
        关键词：Impurity Fe;YL102 Alloy;Conductivity   
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        发布时间：2023-12-18
      • Yu Jiakang Yan Qing Zhou Yaohe
        Issue 2, Pages: 80-82(2005)
        摘要：Transverse feeding of molten metal in continuous fiber preform was investigated theoretically and experimentally.A transverse feeding model was proposed,and a formula of fiber bundle spacing related to fiber geometry,solidification shrinkage rate of metal matrix and volume fraction of fiber were derived from Chevnov law during transverse feeding.The effects of temperature gradients and solidiification pressure on the transverse feeding of C fiber/Al composites were investigated.The results showed that fiber bundle gap,fiber gap in bundles,temperature gradients and solidification pressure siginificantly affect the transverse feeding of continuous fiber reinforced composites.  
          
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        发布时间：2023-12-18
      • Tan Yinyuan
        Issue 2, Pages: 83-84(2005)
        摘要：The damping properties of Al-steel explosive welding compound materials with different thickness were investigated.The results showed that the transmission function has an obvious phasic difference,the amplitude significantly decrease,the internal friction increases,and the instrinsic frequency decreases with the thickness increase of the Al plate.The forced vibrating testing showed that the proper frequency is over 170 Hz or below 50 Hz.  
        关键词：Explosive Welding;Al-steel Bonding Materials;Damping Properties   
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        发布时间：2023-12-18
      • Cheng Xiangfei Yan Hongge Chen Zhenhua He Jianjun
        Issue 2, Pages: 85-87(2005)
        摘要：Al-10Cr alloy was prepared by mixed liquid-solid casting.The effects of superheating temperature,alloy powder addition and grain size of powder on the microstructure and mechanical properties were investigated.It was found that the alloy with uniform fine grain can be obtained under the conditions of 35 ℃ superheating temperature and 60% powder addition as well as powder granulannity of 147～246 μm.The optimized mechanical properties at room temperature are σb=119 MPa,σ0.2=89.5 MPa and δ=1%.  
        关键词：Mixed Loquid-Solid Casting;Al-Cr Alloy;Die Casting   
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        发布时间：2023-12-18
      • Long Wenyuan~1 Cai Qizhou~2 Wei Bokang~2 Chen Liliang~2
        Issue 2, Pages: 88-91(2005)
        摘要：A new phase-field model was developed based on the Ginzberg-Landau theory.The dendrite growth of a Al-6.5Cu binary alloy under non-isothermal and isothermal conditions were simulated by the model coupled with solute field and temperature field.The effects of solidification latent heat on the growth of equiaxed dendrite,distribution of solute field and temperature field in undercooled liquid alloy were analyzed.It was indicated that there is less developed dendrite at non-isothermal solidification than that at isothermal solidification,and the solute composition in the interface can be reduced due to restrain the dendrite growth with the latent heat releases but the composition distribution was independent.Morever,the Peclet value is well in agreement with the Ivantsov theoretical value during non-isothermal solidification.  
        关键词：Phase Field;Binary Alloy;Non-isothermal Solidification;Numerical Simulation   
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        发布时间：2023-12-18
      • Li Donghui~1 Bai Jinlan~2 Qiu Yiqing~3 Liu Xianghua~3
        Issue 2, Pages: 92-95(2005)
        摘要：A new model with varied thermal-physical parameters in which the existence of airspace resulting in heterogeneous heat transfer and the latent heat of fusion at the solidification front was considered was developed.The results showed that the simulated temperature of the billet was well in agreement with the measured one.On-line control method to secondary cooling zone of continuous caster for square billet-target surface temperature control can realize the real-time control for surface temperature.Shell thickness of the billet was investigated based on the developed model.Aimed at the squre billet in continuous casting in the third metallugical plant of the capital steel group,the effects of drawing velocity and overheating on surface temperature and solidification of the billet were analyzed.The influences of different control methods on surface temperature of succeeding cooling loops were discussed for fluctuation of water supply of a certain cooling loop.By consideration of the mutual conjunction among different cooling loops and varied production conditions,simulated results showed that the model is better beneficial to the stabilization of the surface temperature and improvement of the billet quality.  
        关键词：Square Billet;Dynamic Control;Heat Transfer;Secondary Cooling   
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        发布时间：2023-12-18
      • Yu Yangyang Peng Zhifang Wang Chunshui Yan Guangzong
        Issue 2, Pages: 96-98(2005)
        摘要：The creep rupture life of Ni-base superalloy was investigated by the BP algorithm based on ANN method.The model of relation among different temperatures,external stress and creep rupture life of the alloy with different compositions was developed.The simulation for creep rupture life of the alloy was conducted through net training.The simulated results was well in agreement with the measured ones.It shows that ANN method is an available and efficient way to predict the Ni-base superalloy’s creep rupture life.  
        关键词：Artificial Neural Networks（ANN）;BP Algorithm;Ni-base Superalloy;Creep Rupture Life   
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        发布时间：2023-12-18
      • Liang Guangze
        Issue 2, Pages: 99-101(2005)
        摘要：Lost foam casting（LFC） had been researched and applied in China for 40 years,especially rapidly growth in production volume is seen in last years.The production volume in LFC was 125 600 t in 2003,which is 55 times that in 1991year and 9.5 times that in 1995 year.A LFC way with Chinese characteristics has been realized from raw and accessorial materials,special equipment and applied type.  
        关键词：Lost Foam Casting（LFC）;Raw and Accessorial Materials;Special Equipment   
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        发布时间：2023-12-18
      • Zhao Tianlin Zhao Gang Cai Minghui
        Issue 2, Pages: 102-103(2005)
        摘要：The ingate sleeve,punch,divider of ingate system for Al alloy in die casting with WC ionic infiltration can not only increase mechanical properties at high temperature,corrosion resistance and wear resistance but also improve 2.7～7.2 times of the service life.  
        关键词：Diecasting Al;Ingate Sleeve;Ionic Infiltration;WC   
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        发布时间：2023-12-18
      • Hu Bin Guo Hongmin Yang Xiangjie
        Issue 2, Pages: 103-105(2005)
        摘要：The formation and evolution of microstructure of the semi-solid ZL101 alloy slurry prepared by rotating duct were observed under conditions of different processing variables.The exprimental results showed that the spheroidal semi-solid microstructure can be obtained by controlling processing variables,including pouring temperature （640 ℃）,rotating velocity of the duct （232 r/min） and cooling intensity of the crystallizer（preheating 470 ℃）.The effective nucleation numbers of the molten alloy can be increased at a proper pouring temperature and rotating velocity of the duct.It is benefit to growth of primary near-spheroidal α phase by reducing cooling intensity of the crystallizer.  
        关键词：Slurry Preparation;Rotating Duct;Processing Parameters;Non-dendrite   
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        发布时间：2023-12-18
      • Tian Fuxiang
        Issue 2, Pages: 106-107(2005)
        摘要：New type mould structure and processing parameters for harrow piece of nodular cast iron in squeezing casting and its application were discribed.Cooling water way and overflow way for liquid Fe in the mould are designed.To cast a through\|hole on the harrow piece,two float core are respectively set on the punch and the container.Experiments indicates that the harrow piece of nodular cast iron in squeezing casting has the features of excellent mechanical properties and low production cost.  
        关键词：Harrow Piece;Nodular Cast Iron;Float Mould Cores;Squeezing Casting;Cooling Water Way   
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        发布时间：2023-12-18
      • Chen Bing
        Issue 2, Pages: 108-110(2005)
        摘要：The tendency of liquid injection returning to solid injection appears since the 1 990 s due to the demerits of a higher volume-contraction rate and long pattern-making period during liquid injection.Design of fabrication and supply system of paste wax with stable performance is a key factor in paste injection for large wax-presser.The solid injection realizing through-breaking progress in last years possesses the merits of a smaller volume-contraction rate,defects free wax pattern,simple design and manufacture of pressing mold.  
        关键词：Paste Injection;Liquid Injection;Wax Pattern   
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        发布时间：2023-12-18
      • Li Haishu
        Issue 2, Pages: 110-111(2005)
        摘要：The predominant factors influencing the cost were raw materials through analyzing the cost of the compound shell mold for investment casting,so the Al2O3 powder instead of ZrO2 powder and SiO2 sand instead of ZrO2 sand were used for a compound shell mold.The comprehensive properties of the shell were improved and the cost was reduced by alternative stucco method based on analysis of the technology.Compared with the conventional technology,the cost of the materials was decreased by 50%.  
        关键词：Investment Casting;Compound Shell Mold;Cost;Alternative Stucco   
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        发布时间：2023-12-18
      • Jing Zongliang Sun Shiping
        Issue 2, Pages: 112-113(2005)
        摘要：Binary sodium silicate binder transformed into ternary Na2O\|SiO2\|P2O5 compound agglutinative net with addition of Na2HPO4 modifier,which can effectively improve surface binding strength decrease surface roughness of the castings as well as residual strength at high temperature.  
        关键词：Modifier;Sodium Silicate;Agglutinative Net   
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        发布时间：2023-12-18
      • Yuan Zizhou Qiu Shan Kuang Yi
        Issue 2, Pages: 113-114(2005)
        摘要：The numerical simulation was performed by PROCAST soft for mold filling of plate casting in EPC.The mold filling sequence of multi-step gating system and the mold filling pattern of bottom gating system,as well as the influence of pouring velocity in bottom gating system on casting defects were studied.The results showed that molten metal was prior to filling the up-ingate of multi-step gating system which leads to the turbulent flow of liquid metal fronts resulting in gas-hole or inclusion easily appeared in the castings while for the bottom gating system,the molten metal front was relative steady but the over-rapid pouring velocity can result in the gas-hole or inclusion.  
        关键词：EPC;Mold Filling;Numerical Simulation;Defect   
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        发布时间：2023-12-18
      • Zhang Dafu Fan ZitianWu Hebao Dong Xuanpu Huang Naiyu
        Issue 2, Pages: 115-117(2005)
        摘要：We have developed an LFC technoloy with vacuum and low pressure whose equipment was used to examine the filling ability of AZ91D Mg alloy with different variables.Some AZ91D alloy castings with complex geometry including electromotor frame and exhausted pipe were poured successfully.The experimental results indicated that the new LFC technology can siginificantly improve the filling ability of the Mg alloy,eliminate the misrun and cold shut appeared in the Mg castings in gravity LFC process.  
        关键词：Mg Alloy;LFC;Low Pressure Casting;Vacuum Sucking Casting   
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        发布时间：2023-12-18
      • Jin Yundong~1 Luo Jirong~1 Xiao Zehui~1 Li Moyin~2
        Issue 2, Pages: 118-120(2005)
        摘要：EPA with unsaturated aliphatic straight chain is used to modify PF resin,in which methylene is displaced by unsaturated aliphatic straight chain.The modified PF resin possesses a higher strength and lower decomposition temperature than the tranditional PF resin does.The effects of EPA addition on the resin properties and mechanical properties of the coated sand were investigated.It was showed that the 10% adddition is an optimum value.Heat-zero gravity and bending curves at high temperature results showed that the coated sand mixed by the resin was characteried by high strength and good collapsibility.Pouring experience with the collapsible coated sand showed that the time of clean work was shortened and efficiency was significantly increased.  
        关键词：Coated Sand;PF Resin;EPA Modifier;Collapsibility   
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        发布时间：2023-12-18
      • Wu Jingli~1 Bi Weisheng~2 Xiao Wenfeng~1 Ji Daijie~1
        Issue 2, Pages: 120-121(2005)
        摘要：Rotating -spraying impurification technology for liquid Al was introduced.Air-removal and impurification for liquid Al using inert gases with different pure rates were compared.The optimized technological parameters can be determined by comparing impurification by inert gas air-removal with by inert gas combining with refiner air-removal.  
        关键词：Rotating-spraying;Purification of Liquid Aluminum;Refiner   
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        发布时间：2023-12-18
      • Vol. 0, Issue 2, Pages: 122(2005)
          
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      • Vol. 0, Issue 2, Pages: 122(2005)
          
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      • Chen Hong Deng Xuelian Zhou Xizhi
        Issue 2, Pages: 123-125(2005)
        摘要：The failure of used synchronous ring was resulted from the wear.The wear types consists of adhersion wear,fatigue wear,abrasive wear and oxidized wear.Although the different wear mechanism is corresponded to different surface morphology,there exists the formation and propagation of crack in all wear.The results showed that the wear-resistance can be improved by controlling the formation and propagation of the crack due to the wear mainly responsible for the adhersion wear.  
        关键词：Synchronous Ring;Wear Mechanism;Special Yellow Copper   
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        发布时间：2023-12-18
      • Liu Zheng Liu Xiaomei Zhu Yinglu
        Issue 2, Pages: 125-127(2005)
        摘要：Solidification microstructure of Al2O3·SiO2/Zn-RE composites and its interface were observed by SEM.The results showed that there exists a compact interface between Al2O3·SiO2 fibre and matrix and that the proper chemical reaction can be helpful to improve the bonding of the fibre and matrix.Al2O3·SiO2 fibre can be taken as a substrate of heterogeneous eutectic nucleation of the zinc alloy,and the silic phase in fibre/matrix interface is prior to growing in couple growth during solidification,which realizes the Al-Si eutectic transformation and Zn-Al eutectic transformation in the composites.  
        关键词：Al2O3·SiO2 Fibre;Zn Matrix Composites;Solidification Interface;Solidification Structure   
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      • Vol. 0, Issue 2, Pages: 129(2005)
          
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      • Vol. 0, Issue 2, Pages: 130(2005)
          
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