最新刊期
      卷 ， 期 11 ， 2005
      • Wang Zhaohui Kang Yonglin Zhao Hongjin Xu Yue Dong Wenchao
        Issue 11, (2005)
        摘要：Pretreated nano-SiC particle reinforced AM60 magnesium alloy was fabricated by stirring-smelting casting. Effects of nano-SiC particle on the microstructure, mechanical properties and hardness of the Mg alloy were researched. The results show that nano-SiC particle can refine the microstructure and improve the comprehensive mechanical properties of the AM60 magnesium alloy. The tensile strength,elongation and hardness of the nano-particle reinforced AM60 Mg alloy with 1%nano-SiC particle addition is 240 MPa,16% and 53.9,increased by 12.1%,40.3% and 11.6% respectively compared with that of the AM60 Mg alloy without nano-SiC particle with the same method.Meanwhile, the strengthening mechanism of nano-particle SiC on the AM60 magnesium alloy was approached.  
        关键词：Mg Alloy;AM60;Nano-SiC Particle;Microstructure;Mechanical Properties   
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        发布时间：2023-12-18
      • Kong Gang Lu Jintang Xu Qiaoyu
        Issue 11, (2005)
        摘要：The effects of different cooling rates on the peritectic solidification of Zn-2Ni alloy at 750 ℃ were investigated by SEM and EDS, XRD. The results reveal that the peritectic δ phase can only be partially grown on primary γ phase in solidification structure of the Zn-2Ni alloy at the cooling rate of 0.04 ℃/s while be hardly observed at the cooling rates of 1℃/s and 36℃/s. It is concluded that the peritectic solidification characteristics of Zn-2Ni alloy is different from the typical peritectic solidification ones. The peritectic δ phase is difficult to nucleate on the primary γ phase and very slow in growth rate.  
        关键词：Solidification;Peritectics;Zn-Ni Alloy;Hot Dip Galvanization   
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        发布时间：2023-12-18
      • Wang Yanli Ding Hongsheng Guo Jingjie Bi Weisheng Fu Hengzhi
        Issue 11, (2005)
        摘要：We have developed a multi-function directional solidification apparatus with a rectangular cold crucible to conduct the continuously directional solidificationof titanium alloy slabs to examine the effects of processing variables on shaping ability of Ti alloy slabs. The results show that the surface quality of the ingot can be improved with increasing in coil turns and input power while it becomes deteriorated with raising the drawing velocity and lowering the relative position of pedestal to the induction coils. The influential order among the investigated processing variables on surface quality is found to be: the first one is the induction coils, then the input power, the drawing velocity, and the pedestal position. By controlling the appropriate technological parameters, the rectangular slabs free from cracks and ripples can be obtained.  
        关键词：Cold Crucible;electromagnetic casting;Ti Alloy;Directional Solidification   
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        发布时间：2023-12-18
      • Wang Jianzhong 1 Qi Jingang 1,2 Liu Xingjiang 1,2 Liu Tiezheng 1 Wang Bing 1,2 Cang Daqiang 2
        Issue 11, (2005)
        摘要：The hereditary characterization of pure aluminum melt under pulse electric field was investigated by means of remelting experiment. Macrostructure observation shows that the first generation samples get remarkable heredity, whose genetic factor is in the range from 2.8 to 3.0 based on the measurement of grain size in casting structure. It is verified to certain extent that genetic carrier （cluster） among filial generations possesses transferability by analyzing the variability of aluminum melt under pulse electric field with DSC.  
        关键词：Electric Pulse;Aluminum Melt;Genetic Factors;DSC;Cluster   
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        发布时间：2023-12-18
      • Jin Hualan Wei Renjie Yang Xiangjie
        Issue 11, (2005)
        摘要：The growth of phosphate conversion film on magnesium and effects of experimental parameters on corrosion rate were analyzed by SEM and weight loss. The results show that in the initial stage of chemical conversion, the obtained conversion coatings are compact and microflaw can hardly be observed, and the corrosion rate is becoming greater. However, the compact layer begins to appear loose and is finally filled with 90% of the thickness range with increasing the treated time and thickness, and the corrosion rate is reduced gradually.  
        关键词：Mg Alloy;Phosphate;Chemical Conversion Coatings;Corrosion Rate   
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        发布时间：2023-12-18
      • Yang Guangyu Jie Wanqi Hao Qitang
        Issue 11, (2005)
        摘要：As-cast microstructure of ZA53 Mg alloy in sand casting is mainly composed of δ-Mg matrix phase and τ[Mg 12（Al,Zn） 49]compound, in which semi-continuous network τ phase is distributed along δ-Mg matrix phase boundary. Tensile strength at room temperature and plasticity of the quenched alloy can be improved remarkably after solid solution at 335 ℃ for 17 hours. Mechanical properties of the quenched ZA53 alloy is σb =245 MPa and δ= 12% and the fracture morphology transforms from mixed fracture to tough fracture due to microstructure fully transforming single solid solution phase after solid solution at 343℃for 17 h.  
        关键词：Microstructure;Mechanical Properties at Room Temperature;Cast Mg Alloy;Solid Solution;Fracture Morphology   
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        发布时间：2023-12-18
      • Chen Xiaohong Li Yan Tian Baohong Zhang Yi
        Issue 11, (2005)
        摘要：Al 2O 3/Cu composites with dispersive fine Al 2O 3 particle were prepared by internal oxidization on aluminized Cu-Al-Y alloy by using residual oxygen in commercial N 2 gas as agent, in which aluminized treatments for Cu-Al-Y alloy with RE compound CeCl 3 and without CeCl 3 were conducted. The microstructure of aluminized layer, hardness distribution and microstructure of internal oxidation layer were investigated. The results show that RE compound CeCl 3 has more remarkable effect on aluminized Cu-Al-Y alloy, and it has a thicker and more uniformity aluminized layer at the same conditions compared to that of the alloys without being treated. Dispersed enhancing Al 2O 3 particle layer with the thickness of 280 μm on the alloy can be formed after internal oxidation.  
        关键词：Cu-Al-Y Alloy;Aluminizing;Internal Oxidation;Dispersed Enhancement   
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        发布时间：2023-12-18
      • Wan Li 1 Eiji Kato 2 Hiroyuki Nomura 2
        Issue 11, (2005)
        摘要：Local pressurization is a new method for eliminating porosity occurred in castings with thick-section in die casting. The heat transfer and solidification change are analyzed by measuring the temperature change curves of metal mold, casting and pressurized bar in experimental model during local pressurization. It is indicated that local pressurization can significantly shorten the solidified time of castings, meanwhile the temperature of pressurization bar front end is greatly increased while there is no difference in die temperature.The simulation of solidification process under the local pressurization method was carried out through real time modification of mesh file, initial and boundary condition based on the pinned depth. Simulated results were compared with experimental ones.  
        关键词：Die Casting;Local Pressurization;Aluminum Alloy;Porosity;Solidification;Numerical Simulation   
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        发布时间：2023-12-18
      • Chen Yuanfang 1 Hu Jianjun 1 Huang Hong 1 Xia Hua 1 Wang Hongmin 2
        Issue 11, (2005)
        摘要：The CAE analysis of piston castings was conducted by using the MAGMASOFT software. It plays an assistant role in determining the casting processing to simulate the temperature field and predict the shrinkage hole and shrinkage porosity as well as quality statistics. The satisfied pouring effects can be obtained through determining casting processing based on simulated result’s.  
        关键词：Magma Software;Solidification Simulation;Casting Process;Piston   
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        发布时间：2023-12-18
      • Li Shuhua 1,2 Wang Fuchi 1 Tan Chengwen 1 Xu Baocai 2
        Issue 11, (2005)
        摘要：Tungsten heavy alloy （WHA） containing 90%～97% W two-phase composites possesses high density and strength and relatively high ductility. The microstructure and mechanical properties has a remarkable effect on the adiabatic shearing sensitivity of the WHA. The former researches were reviewed. The results show that the relative intensity of tungsten heavy alloy is improved with varying tungsten particles figure. The higher the fibre degree is, the more obvious the crystal anisotropy is, and the easier advent the adiabatic shearingis in the model of drawing, extrusion, radial smithing. Tungsten particles become ellipse after torsion. Adiabatic shearing is easily formed and self-sharpness in evidence and capability of penetration is stronger when the elongated axial orientation consistent with orientation of the strongest shearing stress. The deformation mode, deformation quantity and crystal tropism will be helpful to understanding the mechanism of adiabatic shearing of the materials.  
        关键词：Deformation;Tungsten Heavy Alloy;Adiabatic Shearing   
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        发布时间：2023-12-18
      • Shan Weiwei Jiang Jufu Luo Shoujing
        Issue 11, (2005)
        摘要：The mechanical behavior of semi-solid MB15 magnesium alloy was investigated based on an isothermal compression experiment. The concept of thixotropic strength that is the maximum stress borne on the solid skeleton of semi-solid materials is put forward, which is the stress corresponding to the thixotropic point during steady deformation. Effects of some factors, including the heating temperature, strain rate, holding time, solid grain size, grain roundness as well as the intrinsic strength of the materials, on the thixotropic strength were analyzed, and existent conditions of the thixotropic strength was given. The results show that thixotropic strength is decreased with increase the heating temperature, decreasing the strain rate and extending the holding time while is increased with lowering the solid grain size, increasing the grain roundness and intrinsic strength of the material. The thixotropic strength exists when the solid grain in semi-solid materials jointed with each other to constitute the solid skeletons.  
        关键词：MB15 Magnesium Alloy;Mechanical Behavior;Thixotropic Strength   
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        发布时间：2023-12-18
      • Feng Pengfa1 Tang Jinglin1 Zhang Long1 Li Shuangshou1 Zeng Daben1 Wu HanQi2
        Issue 11, (2005)
        摘要：We have developed a reverible multilevel-speed electromagnetic stirrer to investigate the preparation feasibility of semi-solid slurry by smelt treatment and reversible electromagnetic stirring. The results show that proper melt treatment before electromagnetic stirring can obviously improve the preparation efficiency of semi-solid A356.2 alloy slurry, meanwhile, it is very difficult to preparing semi-solid slurry only by conventional refiner and modifier. The optimal master alloy addition of Al-5Ti-B and Al-10Sr can be given by the orthogonal testing.  
        关键词：A356.2 Alloy;Slurry Preparation;Melt Treatment   
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        发布时间：2023-12-18
      • Qi Lehua 1 Zhou Jiming 1Wang Zhenjun 1 Yang Fang 1 Zhang Yuebing 2
        Issue 11, (2005)
        摘要：The mould temperature field during liquid-solid extrusion was researched by theoretical analysis combining with experimental testing. The curves of mould axial and radial temperature -time were obtained. The change of mould temperatures and its effects on the formation process were analyzed. The simulated results was well in agreement with experimental ones, showing the effectiveness of the model and providing a theoretical basis for optimizing mould design and practical application of composites in liquid-solid extruding casting.  
        关键词：Mould Temperature Field;Liquid-solid Extrusion Casting;FEM   
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        发布时间：2023-12-18
      • Yan Jianjun 1 Zheng Jianrong 1 Chen Liliang 2 Liu Ruixiang 2 Wu Qing 1
        Issue 11, (2005)
        摘要：The recognition of undercut features affects the determination of parting direction, parting lines and face,and it affects the generation of the core and cavity, and creation of the local tools as well as their actuating mechanisms. The determination of optimal parting direction depends on the determination of undercut feature. So, all the undercut features in a mold should be recognized first before the other design activities can be carried out. The definition of undercut feature is introduced and the undercut feature library was set up. The recognition of undercut features of die castings based on the attribute adjacent graph is realized.  
        关键词：Undercut Feature;Feature Recognition;Mold;Die Casting   
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        发布时间：2023-12-18
      • Zhang Shijiao 1 Bian Xiufang 1 Meng Qingge 2
        Issue 11, (2005)
        摘要：Both master alloy and die casting technology can refine the grain size of primary Si in hypereutectic Al-Si alloy in die casting. The effects of Al-P master alloy on the microstructures of hypereutectic Al-5Si alloy in die casting and in metal mold casting were approached. It is revealed that compared with microstructure of hypereutectic Al-Si alloy without Al-P master alloy modification in metal mold casting, the grain size of primary Si phase without Al-P master alloy modification is reduced by 50% while with Al-P modification is decreased by 75% in die casting. Compared with that of the alloy without Al-P modification in die casting, the primary Si size with Al-P modification in die casting is decreased by 40%. It is necessary to modify the hypereutectic Al-Si alloy by Al-P modifier in die casting.  
        关键词：Al-P Master Alloy;Modification;Die Casting;Microstructure   
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        发布时间：2023-12-18
      • Luo Shouxin Sheng Yuhai Liu Younian
        Issue 11, (2005)
        摘要：Silicate ethyl hydrolyzate, sol silicate and active alcohol were used to prepare a mixed binder to be substitute for single silicate ethyl binder. The mixed binder has the advantages of high stability, easy operation, high mold shell strength and cost-effectness, which is the improvement for stuccoing slurry on ceramic mold technique.  
        关键词：Mixed Binder;Silicate Hydrolyzate;Sol Silicate;Ceramic Mold   
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        发布时间：2023-12-18
      • Chen Bing
        Issue 11, (2005)
        摘要：Advent of amounts of commercial software for numerical simulation of casting process abroad shows that the method has been fully grown up and practically used since the 1990s,in which some have been successfully used for investment casting,especially,AFSolid,PASSAGF/POWER,MAGMA,PAM-CAST,ProCAST.  
        关键词：Investment Casting;Numerical Simulation;Computer Application   
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        发布时间：2023-12-18
      • Xia Zhenjia 1Liu Chang 2
        Issue 11, (2005)
        摘要：Vermicular graphite cast iron exhaust pipe in lost foam casting was introduced. The experiment shows that using reverse ingate combined with side-gating system is beneficial to manufacturing the pipe with every assemble set eight parts. Coating has obvious effects on the carburization and ripples of parts surface. The exhaust pipe in lost foam casting with uniform thickness and smooth surface can meet the requirements in material performance and microstructure,having been used for some type of HongQi Car.  
        关键词：Lost Foam Casting;Vermicular Graphite Cast Iron;Exhaust Pipe   
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        发布时间：2023-12-18
      • Pan Jinhua
        Issue 11, (2005)
        摘要：Casting process of copper tower for Wutai mountain was introduced. Aiming at its special structure, three casting methods including fine sand green mold, resin lost mold and investment casting, were combined in casting and the surface colorization for the copper tower was introduced, which provided a reference for the similar art castings.  
        关键词：Copper Tower;Fine sand Green Mould;Resin Sand Mould;Investment Casting   
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        发布时间：2023-12-18
      • Li Deyou Huang Xingao Su Bailin Zhu Jinhong
        Issue 11, (2005)
        摘要：The bracket wheel,bracket wheel driving equipment of two kinds of DN-100 mm pit-machiner for internal wall of pipe mould was conducted technological improvement aiming at the problems encountered in practical production.The pit-depth and pit-diameter of improved pit-machiner were increarsed by 0.10 mm and 1.5 mm everagely,respectively,while the cold-shut and re-layer of pipe in waste product rate was decreased to 5% from 43%,meanwhile,the work-out rate and energy-comsuption were decreased also.  
          
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        发布时间：2023-12-18
      • Peng Lihua Li Yuancai Liu Yang Wei Haiqin Liu Jintao
        Issue 11, (2005)
        摘要：A kind of polishing agent PPG-1 with cost-effective and high performance suitable for Al-Si alloy products was developed based on spiral vibration polishing processing. The experiment shows that the polishing agent is obviusly superior to tranditional ZJP agent in polishing effects.The phase analysis by XRD indicates that an organic compound protective film was formed on the surface of polished products to effectively prevent the product from oxidation so that the surface lightness was kept.  
        关键词：Al-Si Alloy;Spiral Vibration Polishing;Polishing Agent   
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        发布时间：2023-12-18
      • Lin Qiquan 1,2 Peng Dashu 2 Chen Xianfeng 2
        Issue 11, (2005)
        摘要：The stress corrosion cracking （SCC） sensitivity was evaluated with parameters such as K σ（strength index） and K δ（elongation index）. The SCC sensitivities of T6,T7,T8 treated 2 519 aluminum alloy hot rolled plate were investigated. The experiments indicate that SCC sensitivity ranks in the order of T8>T7>T6 while mechanical properties rank in the order of T6>T7>T8. The potentiostatic polarization curves tests were carried out at room temperature for T6,T7,T8 treated 2519 aluminum alloy. The electrochemical corrosion behavior of stressed samples shows that the SCC sensitivity can be assessed by polarization resistance （R p）, so the higher the R pis,the better the SCC resistance is.  
        关键词：2 519 Aluminum Alloy;Stress Corrosion Cracking Sensitivity;Polarization Resistance   
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        发布时间：2023-12-18
      • Zhou Shijie 1,2 Tang Shengyu 2
        Issue 11, (2005)
        摘要：The weight loss and friction coefficient of self-developed LTHAl65-6-4-3-1 brass and JISCAC304C brass from Japan as well as their microstructure were investigated with different time and load. The results show that the wear resistance of LTHAl65-6-4-3-1 brass is superior to that of JISCAC304C. Microstructure observation indicates that LTHAl65-6-4-3-1 brass has a deformed microstructure, in which fine enhancing particle is uniformly distributed in the matrix, while JISCAC304C brass has uncompletely worked microstructure and uneven grain size and distribution of enhancing particle, meanwhile, the microstructual soundness of LTHAl65-6-4-3-1 brass is higher than that of JISCAC304C brass. The wear resistance is dependant on the microstructure of the alloy.  
        关键词：Al-brass;Wear Resistance;Microstructure   
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        发布时间：2023-12-18
      • Yang Yongqin 1 Xiong Yaju 2 Chen Qichao 2
        Issue 11, (2005)
        摘要：Available technologies used in the manufacturing of mould for Zn alloy automobile’s light housing were analyzed. The mould were rapidly and low costly manufactured by adopting combined structure of cast iron convex mould and Zn alloy concave mould, and by controlling rational processing parameters and self-developed FX coating.  
        关键词：Zn Alloy;Cast Iron Convex Mould;Zn Alloy Concave Mould;Coating   
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      • Vol. 0, Issue 11, (2005)
          
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      • Li Wei 1,2 Qi Xiaobing 3 Piao Dongxue 3
        Issue 11, (2005)
        摘要：Carbon/carbon fibres （C/CF） performbars were prepared by the resin carbonation and carbon CVD. The effects of matrix carbon （resin carbonated carbon and deposited carbon ）on the solidification, micro-hardness and friction wear of the C/CF/Cu composites prepared by squeezing casting were investigated by observing and analyzing the morphology of composites interface and constituent distribution using SEM and testing material micro-hardness and slide friction wear. The results show that the C/CF perform bar has higher compactness and impede liquid copper to form in squeezing casting while the microhardness is higher than that of ones only by carbonated carbon. The C/CF/Cu composites is higher than pure Cu not only in slide friction wear resistance but also in slide friction coefficient. The C/CF/Cu composites are antifriction materials.  
        关键词：C/CF/Cu Composites;CVD;Carbonation;Carbon;Fiction Wear   
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