最新刊期
      卷 ， 期 3 ， 2004
      • Li Jinshan Cao Haitao Hu Rui Chen Zhongwei Geng Xingguo
        Issue 3, Pages: 1-3(2004)
        摘要：The progress in effective factors and the grain refinement mechanism in ECAP was summarized. The effects of the pressing temeprature and speed on the materials during ECAP were discussed. The effects of deformation approaches and times on grain size and deformation degree of the materials were reviewed briefly. Approaches to present status of the ultra-fine grain materials processed by ECAP were performed and some further research issues were proposed.  
        关键词：ECAP;SPD;Simple Shear;Ultra-fine Grain Materials   
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        发布时间：2023-12-18
      • Pan Ye Zhang Chuan Sun Guoxiong
        Issue 3, Pages: 4-6(2004)
        摘要：The Al2O3-Cr and Al2O3（-Cr2O3）-Cr cermets with higher soundness were successfully fabricated by combustion synthesis -casting method. The influence of Al2O3, Cr2O3 diluents and solidification cooling rate on microstructure of the cermets was examined. The results showed that Al2O3 or Cr2O3 addition can effectively control severe combustion reaction, and form the eutectic structure of Cr phase and ceramic matrix. Fine Cr phase with sub-micron scale was uniformly distributed in ceramic matrix in graphite mold.  
        关键词：Cermets;Microstructure;Combustion Synthesis   
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        发布时间：2023-12-18
      • Liu Ruixiang Chen Liliang Zhou Jianxin Liao Dunming Wei Huasheng
        Issue 3, Pages: 6-7(2004)
        摘要：The proposed numerical mouse is a excellent method to overcome the limited distinguish precision of the view to dense and micro\|change colors.The conventional AVI for numerical simulation,similar to movie and television,only looks on fixed sequent picture at fixed view field and view angle due to lacks of interaction ability.Proposed real time animation and real time dragging can rotate,zoom in and out etc. at random when the user observe the simulated resulting during animation running.  
        关键词：Post Processing;Numerical Distinguish;Numerical Mouse;Real Time Animation;Real Time Dragging   
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        发布时间：2023-12-18
      • Li Peijie Zheng Weichao Tang Bin Zeng Daben
        Issue 3, Pages: 8-10(2004)
        摘要：Effect of Ca and Sr on the grain refinement of the ZA91D Mg alloy was conducted.Although w（Ca）<1% addition into AZ91D Mg alloy can refine grain size and increase yield strength,yet decrease the tensile strength and elongation of the alloy due to the segregation of Al2Ca phase in grain boundary resulting in embrittlement of the alloy matrix.The grain size can almost remain unchange with the addition of w（Sr）<0.2%.The mixed Ca and Sr addition not only reduce the grain size but also improve the comprehensive mechanical properties of the alloy.  
        关键词：AZ91D Mg Alloy;Grain Refinement;Ca;Sr   
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      • Vol. 0, Issue 3, Pages: 10(2004)
          
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      • Luo Chao Wu Sheng Xie Zhiyi Wang Zhenhong
        Issue 3, Pages: 11-12(2004)
        摘要：The numerical simulation for the microstructure of U-2Nb alloy tube\|like part with 107 mm/77 mm×80 mm under cooling rate of 50 ℃/min was conducted by CA\|FE module（cellular automaton-finite element） in Procast and Calcosoft-3D software. The results showed that the sequence of casting grain size varied from the inner to the outer layers in the section of the casting part at the same level in height as follows : grain size in the inner position<grain size in the outer position<grain size in the middle position. The grain size gradually reduced from the top to the bottom of the part. Although the measured value of grain size in the middle position at different level in height of U-2Nb alloy parts with optical metallographic method was approximately a half of calculated values,the change in trend of the both grain sizes is the same. The simulated results reached to the qualitative or semi-quantitative level.  
        关键词：U-2Nb Alloy;Casting;Grain Size;Numerical Simulation   
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        发布时间：2023-12-18
      • Jiang Haitao Huang Weichao Lu Yalin Li Miaoquan
        Issue 3, Pages: 13-15(2004)
        摘要：The microstructures and mechanical properties of the semi-solid Al-4Cu-Mg alloy prepared by SIMA were investigated. Results showed that the fine and near-spheroidal microstructures can be obtained by properly choosing the SIMA processing parameters. Grain size decreased with increasing the reduction, decreasing the isothermal temeprature and the holding time. The spheroidization of grain is promoted with the increase in reduction, isothermal temperature and the holding time as well as the decrease in fractual dimension. The semi-sold materials with 358～387 MPa of compression ultimate strength and 246～265 MPa of yield strength at room temperature can be prepared by the SIMA with 20%～25% reduction at 580～600 ℃ and holding time for 2～6 min.  
        关键词：Semi-solid Al-4Cu-Mg Alloy;SIMA Technology;Microstructure;Mechanical Properties   
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        发布时间：2023-12-18
      • Zhao Chengzhi Guo Jingjie Su Yanqing Wu Shiping Jia Jun
        Issue 3, Pages: 16-18(2004)
        摘要：The specimens of Cu\|Cr\|In ternary alloy with varying In contents were prepared by combined metal mold.The microstructure of the specimens were observed by electron probe and X ray diffraction.The effects of In contents on the microstructure of the alloy were examined.It is found that the dendrite in microstructure tended to increase with increasing in In contents.The dendrite secondary arm spacing increased with increased in In contents and the lattice constants of matrix crystal increase with the increase in contents due to formationg of replaced atom in matrix crystal for Cu solid solution phase.The phase constituent of the alloy is composed of Cu solid solution phase and Cu9In4 as well as Cr solid solution phase.  
        关键词：Cu-In-Cr;Dendrite;Phase Constituent   
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        发布时间：2023-12-18
      • Gao Hongwu Hu Xiaoju Li Changmao Liu Liming Liu Shunhua
        Issue 3, Pages: 19-21(2004)
        摘要：Effects of Sb on as-cast microstructure of Mg-6Al alloy and mechanical properties of its welding wire in hot extruding were examined. It is found that Sb can obviously refine α-Mg grain and Mg 17Al 12 phase in as-cast microstructure of Mg-6Al alloy. Short rod-like intermetallic compound Mg3Sb2 generated as a result of Sb combination with Mg was uniformly distributed in α-Mg grain and grain boundary.1% Sb addition can most remarkably refine as-cast microstructure and significantly improve the ultimate tensile strength σb （334.6 MPa） and the elongation δ（14.54%） of Mg-6Al alloy welding wire which was increased by 61% and by 37% respectively compared with conventional Mg-6Al alloy.  
        关键词：Mg-6Al-Sb Alloy;Microstructure;Welding Wire;Mechanical Properties   
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        发布时间：2023-12-18
      • Hao Weixin Yang Gencang Xie Hui
        Issue 3, Pages: 22-23(2004)
        摘要：The solidification simulation of Cu-40Pb hypermonotectic alloy has been carried out in microgravity elctromagnetic condition. The results showed that the Stockes deposition effects produced by L2（Pb） phase can be restrained so that coarse α（Cu） dendrite after aging Pb phase distributed between α（Cu） dendrites can be obtained in solidified structure due to liquid alloy being in quasi-zero gravity in the immiscible interval when applying electromagnetic force under the circumstance of simulated microgravity. Subsequently, the specific gravity segregation during solidification process was eliminated.  
        关键词：Microgravity;Electromagnetic Simulation;Cu-Pb Hypermonotectic Alloy;Segregation   
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        发布时间：2023-12-18
      • Li Rongde Ma Jianchao Zhou Zhenping
        Issue 3, Pages: 24-26(2004)
        摘要：The refining effects on the morphology of iron phase in hypereutectic Al-5Fe alloy with C2Cl6 at different temperatures were investigated. The results showed that the morphology of iron phase transformed from the long-needle-like into the flower-like or the particle-like at higher temperatures, furthemore,the uniform distribution of microstructure with mainly refined particle can be obtained at 950 ℃.The tensile strength of the alloy can be improved obviously. The effect of refining process on improvement in the microstructure was analyzed also.  
        关键词：Hypereutectic Al-Fe Alloy;Iron Phase;Refinement   
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        发布时间：2023-12-18
      • Yang Bicheng Du Dongchao Zhu Xuexin Xu Jun Xie Lijun
        Issue 3, Pages: 26-28(2004)
        摘要：The effects of varying stirring frequency and cooling rate on the microstructure of Mg-Al-Si alloy were examined. The comparison of the stirred microstructure with the non-stirred microstructure was conducted. The results showed that the electromagnetic stirring can completely restrain the formation of dendrites.α-Mg tended to equiaxed grain with the increase in stirring frequency while the grain morphology remained un-change and the microstructure became more coarse with extending the stirring time.In addition,the electromagnetic stirring can promote the nucleation of Mg2Si phase during solidification.  
        关键词：Mg-Al-Si Alloy;Electromagnetic Stirring;Semi-solid Slurry;Microstructure and Morphology   
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        发布时间：2023-12-18
      • Lei Jingguo Liu Ping Zhao Dongmei
        Issue 3, Pages: 29-31(2004)
        摘要：Effects of cold hardening on the aged microstructure and property of Cu-Ni-Si-Cr alloy with different cold deformation rate was studied by means of micro-hardness measurement.The results showed that working hardening resulted from the increase in dislocation density responsible for dislocation tangle. The alloy possessed higher working hardening degree during ageing at middle temperature interval （400～450 ℃）. The working hardening degree rose remarkablely with decreasing temeprature.  
        关键词：Cu-Ni-Si-Cr Alloy;Micro-Hardness;Working Hardening   
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        发布时间：2023-12-18
      • Jin Yuhua Lu Yang Wang Zhiping Li Wensheng Xu Jianlin
        Issue 3, Pages: 32-33(2004)
        摘要：As-cast structure of high Al-bronze were compared under dry friction with under oil-lubricant friction. Also anti-frictional characteristics of as-cast and heat treated Al-bronze Cu14Al were compared under oil-lubricant condition.The results showed that high Al bronze Cu14Alx was un-suitable for dry friction. Under oil lubricant condition the friction coefficient decreased from 0.526～0.684 to 0.138～0.161 and wear mass-loss decreased up to about 3.7% of that under dry friction.Frictional coefficient of solid solution treated alloy at 860～900 ℃ with ageing at 560～ 600 ℃ decreased from 0.138～0.161 to 0.022～0.038 and frictional mass-loss decreased up to about 40% compared with that of as-cast alloy under oil lubricated condition.  
        关键词：High Al-bronze;Dry Friction;Oil Lubricated Friction;Heat Treatment;Frictional Characteristics   
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        发布时间：2023-12-18
      • Zhao Yuguang Zhou Wei Qin Qingdong Liang Yunhong Jiang Qichuan
        Issue 3, Pages: 34-36(2004)
        摘要：The influence of pre-oxidation on oxidation resistance of Ti-6Al-4V alloy at 600 ℃ in air was examined. The surface morphology, phase constituent and structure in oxidized layer were analyzed by means of XRD and SEM. The results showed that the formation of sound Al2O3 and TiO2 films on the surface of pre-oxidized Ti alloy not only changed the oxidation mechanism from the diffusion of O2 towards interior to the diffusion of Ti towards exterior during oxidation at high temperature, but also decreased greatly the oxidation rate of the alloy, improving the adherence and the peeling off resistance of oxidized film.  
        关键词：Ti-Al-4V;Pre-oxidation;Oxidation Resistance at High Temperature   
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        发布时间：2023-12-18
      • Xu Lin Yang Xiangjie Guo Hongmin
        Issue 3, Pages: 37-39(2004)
        摘要：A macro-micro coupled model combined with the finite differential method and the modified cellular automaton model is used to simulate the solidification of Al-2.5Si alloy in metallic mold,considering the temperature field, solute field and the growth of dendrite. Compared with the classic cellular automaton, the modified cellular automaton model considered not only the temperature field diffusion, but also effects of the diffusion of solute in liquid and interface curvature as well as the enrichment of solute on supercooling of dendrite tip. Large-grid and small-grid were respectively used to simulate the macro-temperature field and micro\|structure evolution in the coupled model. Three typical images of columnar-to-equiaxed grain transition were obtained at three pouring temperatures. Considering boundary condition, it was showed that the simulated results differed from theoretical analysis in nucleation of equaixed grain  
        关键词：Cellular Automaton;Macro-micro Coupling;Microstructure Simulation   
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        发布时间：2023-12-18
      • Zhang Yonghong Zheng Zhongjun
        Issue 3, Pages: 40-41(2004)
        摘要：Development of graphics parametrization CAD system was introduced using Microsoft VC++6.0 combining with ObjectiARX2000 based on AutoCAD 2000 platform. The system development was completed by adopting primary interfacial module,database module,graphics parametrization module as well as setting Microsoft VC++6.0 function.  
        关键词：Parametrization;AutoCAD2000;ObjectARX2000;Modularization   
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        发布时间：2023-12-18
      • Meng Xianjia Liu Yunsheng Wang Chengzhi Deng Ziyu Li Xuemei
        Issue 3, Pages: 42-44(2004)
        摘要：The solid modeling in CAD die casting die system based on characteristic parametrization was developed. The solid models of die casting die parts were established using parametrized and characterized modeling based on the die disassembling technique.The parametrized solid graphics-base is built up based on the temporary model base, sharing model base and parametrized model base. And the parametrized solid assembly figure of die-casting die was established based on the data-structure of defining the assembly relationship among die parts.The technique plays an important role in the CAD system for die casting die, achieving good application to practical production.  
        关键词：Die Casting Die;Parametrized Modeling;Characteristic;Model Base   
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      • Zhu Yaochan Yang Gencang Wang Jincheng Zhao Dawen Yu Yanmei
        Issue 3, Pages: 45-47(2004)
        摘要：Theory and present research status of numerical simulation for eutectic solidification with multi-phase field method were expounded. The multi-phase field model has experienced the development stages from pure material grain to multi-phase and multinary alloy, from isotropy to anisotropy,from isothermal temperature to aniso-thermal temperature. The further research prospects were pointed out.It is suggested that flow field and stress field as well as other fields would be considered in future trendency of the multi-phase field model.  
        关键词：Multi-phase Field Method;Solidification Process;Eutectic Alloy;Microstructure;Numerical Simulation   
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        发布时间：2023-12-18
      • Huang Dong Xie Chengmu Nan Hai Wu He Zhao Jiaqi
        Issue 3, Pages: 47-49(2004)
        摘要：The research history and present status of refractory materials of mold shell for Ti and Ti alloy in investment casting in freign countries were introduced.The developing trend was briefly predicted. The refractory materials have gone through three stages of graphite materials, ceramic materials with W coating layer and V2O3 ceramic materials.  
        关键词：Ti Alloy;Investment Casting;Refractory Materials   
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      • Miu Huaqing Wang Jiaxuan Xiong Hongmiao Li Chun Hu Defeng
        Issue 3, Pages: 50-52(2004)
        摘要：The general bland in squeezing casting was produced based on the analysis of LY12 alloy flange structure.It is found that the squeezing casting can be used to produce flange component with LY12 alloy.The machined flange can not only meet the designing requirement but also improve the utilization efficiency of materials decrease in working time\|comsumption and machining cost.  
        关键词：LY12 Alloy;Squeezing Casting;Flange   
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      • Qian Wanxuan
        Issue 3, Pages: 52-54(2004)
        摘要：It is helpful to control melting temeprature to set time-alarm in melting system. It is effective to determine the switch point from slow injection to fast injection and to slect punch velocity of fast injection for ensuring ejection speed. It is beneficial to set overflow channel and cooling water channel for the balance of mould temeprature. Gas hole and inclusion can be reduced by properly increasing thickness,and quality of the chilling layer, uniformly spraying and cleaning the mould cavity on time. The mechanical properties of die casting parts can be improved by ageing at lower temeprature.  
        关键词：Die Casting Parts;Die Casting;Management   
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        发布时间：2023-12-18
      • Xu Yunxiang
        Issue 3, Pages: 55-58(2004)
        摘要：The requirements for silica sol and refractory powder for mold shell in face layer differ from that in back layer.The effects of diameter and distribution of sollica sol particle, content of （ZrHf）O2 and Fe2O3 in ZrO2 powder as well as grain fineness of refractory powder on the quality of mold shell were analyzed. The different processing specifications should be drawn individually due to different requirements for temperature, humidity and air-speed in drying chamber in face layer and back layer of silica sol mold shell.  
        关键词：Investment Casting;Solica Sol;Shellmaking;ZrO2   
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      • Zhao Jingxiang Li Tong Yan Xingyi
        Issue 3, Pages: 58-59(2004)
        摘要：Batch\|bulk of stainless steel impeller with complicated blade were produced successfully by using CAD molding tool design and soluble salt core to form blade of impeller as well as by orthogonal experiment to determine baking tenperature,baking time of mold shell and pouring temperature of the impeller.  
        关键词：Impeller;Investment Casting;Soluble Salt Core;Cold Shut;Porosity   
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        发布时间：2023-12-18
      • Cui Hengxuan
        Issue 3, Pages: 60-61(2004)
        摘要：The production of light nodular graphite iron parts with high ductility in investment casting was expounded in all aspects including both technological analysis and processing control. The main defects and their prevention for ductile iron parts in investment casting were analyzed.  
        关键词：Ductile Iron Parts in Investment Casting;Strength of Mold Shell;Nodularization   
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      • Liu Lanjun Zhou Jie Xu Qingbai
        Issue 3, Pages: 62-63(2004)
        摘要：The technological features in EPC were analyzed. It is pointed out that the good wettability between liquidized product of foam pattern and coating layer is helpful to the liquid product removal. The effects of mica on brushability in EPC and coating layer on the wettability of liquidized product of foam pattern were investigated. The results showed that the mica is beneficial for improving the brushability of the coating but detriment to removal of liquidized product of foam pattern.  
        关键词：Mica;EPC;Coating;Brushability;Wettability   
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      • Han Jiande Bian Xiufang Sun Yimin Hu Linan
        Issue 3, Pages: 64-65(2004)
        摘要：A new spining-spray graphite rotor equipment was designed for use with a combination of gas and flux into molten aluminum being purified. The technological advantages is quantitative uniform addition of flux in turn not to be jamed in tube channel. The key parts of the new equipment was introduced from a point of view of both design pricinple and technological essence.  
        关键词：Aluminum Alloy;Purification Treatment;Spining-spraying Rotor   
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      • Zhang Yongjun Liao Jingyu
        Issue 3, Pages: 66-68(2004)
        摘要：Anodization was one of most effective and most common technology used for all kinds of Mg surface treatment.The classical anodizing processes of Dow17 and HAE for Mg, were compared in all its aspects with the environmentally friendly process, denoted as Starter. The results showed that the choice of anodizing parameters had a very important effect on the courses and results of anodization.The anodic films with different color, uniformity, roughness, corrosion and wear resistance as well as bonding with Mg-matrix etc. were greatly dependant on the varieties of processing parameters.  
        关键词：Mg;Anodization;Oxidized Film   
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      • Wu Yuying Liu Xiangfa Liu Xiangjun Bian Xiufang
        Issue 3, Pages: 69-70(2004)
        摘要：Cu-P base master alloy was studied by means of DSC, SEM and OM. The results showed that ternary Cu-16Sn-8P master alloy can be obtained by adding some Sn into binary eutectic Cu-P master alloy. Based on above results a multi-element Cu-P base master alloy with low melting point of 630℃ can be developed. Compared with binary Cu-P base master alloy, the new master alloy possessed better modification effects on hypereutectic Al-24Si alloy, meanwhile, the master alloy have good modification effects on ZL109 alloy also.  
        关键词：Al-Si Alloy;Modification;Cu-P Base Master Alloy   
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      • Vol. 0, Issue 3, Pages: 71-72(2004)
          
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