最新刊期
      卷 ， 期 10 ， 2005
      • Qi Jingang 1,2 Wang Jianzhong 2 Liu Xingjiang 1,2 Liu Tiezheng 2 Cang Daqiang 1
        Issue 10, (2005)
        摘要：The hereditary behaviors of aluminum melt under different pulse currents were systemically investigated by means of repetitious remelting experiments.The results indicate that the genetic factors via grain-size are directly dependent on the pulse voltage,in which the hereditary fading rule is accordant with the equation of In=1+e -αn+β.The stability of genetic carrier （cluster） is dependent on the competition between repetitious cooling and heating impulse as well as effects of electric pulse modification.  
        关键词：Electric Pulse Modification;Remelting;Hereditary Fading;Cluster   
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        发布时间：2023-12-18
      • Wu Shusen 1 Li Yong 1 Mao Youwu 1 An Qing 2
        Issue 10, (2005)
        摘要：Al2O3 particle with the sizes of 2 μm,7 μm and 10 μm and volume fractions of 5%,10% and 15% reinforced Cu matrix composites were fabricated by briquette sintering plus repress and resintering.The results show that sintering process is a dominant factor influencing the density of Al2O3/Cu composites,and the repress and resintering can further improve the density and mechanical properties of the composites.Microstructure observation indicates that Al2O3 particle is uniformly distributed in the matrix,exhibiting the good bonding in interface.  
        关键词：Al2O3/Cu Composites;Density;Particle Distribution   
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        发布时间：2023-12-18
      • Huang Jin Zhang Youshou Xia Lu Li Sinian
        Issue 10, (2005)
        摘要：A newly alcohol-based sand-shape coating for heavy section steel castings was introduced to prevent steel penetration into sand moulds and cores.The main refractory of the coating consists of the 75～200 mesh chromite sand,magnesite and corundum sand.Although it is an alcohol-based sand coating,it has exhibited good behaviors in suspension,brushing,wear resistance.The experiment and practical production prove that the coating not only can prevent the penetration of liquid steel into sand mould and cores to effectively improve the surface quality of the cast steel castings,but also can substitute for chromite sand to be used to the surface of the moulds and cores.The mechanism is analyzed also.  
        关键词：Heavy Section Cast Steel Castings;Penetration-prevention;Alcohol-based Sand Coating   
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        发布时间：2023-12-18
      • He Jianjun Chen Zhenhua Yan Hongge Gao Wenli
        Issue 10, (2005)
        摘要：The microstructure and mechanical properties of the Al-10Mn,Al-15Mn and Al-20Mn alloys prepared by solid-liquid casting were researched.It is revealed that the microstructure of the Al-Mn alloy can be obviously refined by liquid-solid casting,in which the size of the primary phase with spheroidal or equiaxed shape is lower than 10 μm.Compared with that in conventional casting methods,the tensile strength of the Al-Mn alloy in solid-liquid casting is increased by 110～160 MPa from 40～60 MPa and elongation is increased by 1% from zero.The microstructure of the Al-Mn alloy in both conventional casting and solid-liquid casting become coarser with the increase of the Mn contents so the tensile strength was decreased and hardness is slightly increased.The solid-liquid casting can extend the composition scope of the Al-Mn alloy for research and application.  
        关键词：Casting;Solid-liquid Casting;Al-Mn Alloy   
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        发布时间：2023-12-18
      • Zuo Xiurong 1 Zhong Zhiguo 1 Li Lixiang 1 Song Tianfu 1 Weng Yonggang 1 Fang Changtao 2
        Issue 10, (2005)
        摘要：Grain-refining aluminum ingots with Ti contents lower than 0.2% were produced by direct electrolysis,in which TiO2 was added into electrolytic pool for pure aluminum.The structure and properties of 6063 alloy produced with the grain-refining aluminum ingot were investigated.The results show that 6063 aluminum alloy with Ti addition by electrolyte has the advantages of low cost.The 6063 aluminum profile produced with grain-refining aluminum ingots whose surface performance and mechanical properties can fully meet the requirements of GB/T 5237 have fine and uniform grain.The tensile strength of 6063 aluminum alloy refined by both grain-refining aluminum ingot -RE and grain-refining aluminum ingot-Re-B is equivalent to that of the 6063 alloy refined by Al-5Ti-B master alloy while increased by 20% in elongation,meanwhile,it has the better surface performance.  
        关键词：Grain-refining Ingots;6063 Aluminum Alloy;Microstructure;Mechanical Properties   
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        发布时间：2023-12-18
      • Yuan Lang Xiong Shoumei Liu Baicheng
        Issue 10, (2005)
        摘要：The air entrapment caused by the liquid metal flow in the shot sleeve is one of the factors influencing the quality of the die castings.Aiming at the shot sleeve injection process,the model of flow field coupled with temperature field in the liquid metal flow in the shot sleeve was developed,in which the profile of the plunger movement and the heat transfer in the liquid metal flow were considered.The numerical simulation for liquid metal flow in the shot sleeve and heat transfer was performed by the developed model.The simulated results is well in agreement with the Flow-3D simulated ones and critical velocity.Optimizing the movement profile of the plunger can minimize the air entrapment in the shot sleeve.  
        关键词：Die Casting;Shot Sleeve;Flow Field;Temperature Field;Numerical Simulation   
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        发布时间：2023-12-18
      • Zha Jili 1 Long Siyuan 1,2 Xu Shaorong 1
        Issue 10, (2005)
        摘要：The technique ways of application platform for production of Mg alloy components based on modern design and manufacturing technology were described by the analysis of motorcycle wheel.The results show that Mg alloy motorcycle wheel in squeezing casting can fully meet the requirements of production and service performance through the analysis of product service performance and material substitution and processing design.The developed period can be greatly decreased based on the technique platform,dropping the developing -risk and cost.  
        关键词：Magnesium Alloy;Technique Platform;Wheel;Material Substitution   
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        发布时间：2023-12-18
      • Vol. 0, Issue 10, (2005)
          
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        发布时间：2023-12-18
      • Hu Hongjun
        Issue 10, (2005)
        摘要：Necessity and software design of management information system for castings storage are introduced.Aiming at the existing problem in foundry enterprises,the implementation of the solution sketch is presented.With the solution,the information sharing,operation process standardization and casting coding standardization can be achieved.As an illustrative instance,the requirement and procedure of software design are introduced.Some key techniques in development of software system were expounded.  
        关键词：Information Sharing;Castings Storage Management;Database   
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        发布时间：2023-12-18
      • Gao Songfu Mao Weimin Bai Yuelong Li Qiang
        Issue 10, (2005)
        摘要：Effects of injection specific pressure and injection speed on the filling ability of semi-solid A356 alloy in rheo-casting were investigated.It is revealed that the filling pressure and the thickness of the billets have greatly affected the filling ability of semi-solid A356 Al alloy slurry prepared by the new method.The thicker the billets is,and the bigger the filling pressure is,the better the filling ability is,and vice verse.In order to obtain perfect castings,the filling pressure for the billets with 10 mm thickness should be equal to or more than 15 MPa and for the billets with 5 mm thickness equal to or more than 20 MPa.The injection velocity has great effects on the filling ability of the semi-solid A356 alloy slurry,and that the higher the injection is,the better the filling ability of the slurry is.For making sound castings,the filling velocity for the billets with 10 mm thickness should be equal to or more than 0.384 m/s while for the castings with 5 mm thickness equal to or more than 1.152 m/s.The billets with uniformly distributed microstructure in rheo-casting are beneficial to obtaining the A356 alloy die castings with perfect quality.  
        关键词：Semi-solid;Rheo-casting;A356 Alloy   
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        发布时间：2023-12-18
      • Guan Renguo Kang Liwen Shang Jianhong Wang Chao Wen Jinglin
        Issue 10, (2005)
        摘要：During manufacturing the semi-solid alloy by inclined cooling-shearing process,the microstructure of the alloy involves from coarse dendrite to fine spherical grains,and microstructure formation is related to dendrite fracture and explosive nucleation mechanism.Meanwhile,the microstructure of the alloy was significantly affected by inclined angle and length,pouring temperature as well as surface properties of the inclined plate.The results show that the inclined cooling-shearing rheocasting can greatly improve the microstructure of the 1Cr18Ni9Ti stainless steel and feather-grain structures of the Al-10Mg alloy in conventional casting.  
        关键词：Inclined Cooling-shearing;Semi-solid;Microstructure;Al-Mg Alloy;Stainless Steel   
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        发布时间：2023-12-18
      • Zhang Yunlong Liu Liufa Wei Zhongshan Lu Chen
        Issue 10, (2005)
        摘要：Effects of different Si contents,including 0.5%,0.93%, 1.91%,on the microstructure,fluidity,mechanical properties and fracture of die casting AM50 Mg alloy were investigated.Two kinds of Mg2Si phases with different morphologies that are polygon particle and bulky Chinese script can be observed from the Mg alloy containing Si.Although the Si can improve the fluidity and hardness of the Mg alloy,it can result in the decrease of the mechanical properties with over 0.93% content.The fracture morphology exhibits brittle cleavage or quasi-cleavage.  
        关键词：Mg Alloy;Die Casting;Si   
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        发布时间：2023-12-18
      • Zhao Hongjin 1,2 Kang Yonglin 1 Wang Zhaohui 1 Liu Jinwei 1 Du Hailiang 1
        Issue 10, (2005)
        摘要：According to the characteristics of simple shape and thick-walled of the Mg alloy beam-barrel parts,adirect squeezing casting schematic was set to meet the requirements of high-strength and ductility.The heat treatable beam-barrel Mg alloy parts were manufactured with the pouring temperalure at 650 ℃ and extrusive pressure at 80 MPa by using the designed squeezing casting mould suitable for conventional hydraulic press.Solid solution and artificial ageing can improve the strength and plasticity of the beam-barrel Mg alloy parts.  
        关键词：Magnesium Alloy;Direct Squeezing Casting;Smelting-casting Method;Heat Treatment;Microstructure and Properties   
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        发布时间：2023-12-18
      • Li Chenxi Cao Liang San Jingchao Xu Na Bai Yanhua Li Rongde
        Issue 10, (2005)
        摘要：Generally,the squeezing casting is only employed for the castings whose height-diameter ratio is less than 3.5.Researching the castings with high height-diameter ratio in squeezing casting can extend the applicable scopes of the advanced casting technology.The mechanical properties of the ZA27 alloy with the high height-diameter ratio of 7 and distribution of temperature,pressure and shrinkage porosity during solidification process were investigated by experiment and numerical simulation.It is revealed that the shrinkage porosity in the castings with high height-diameter ratio can be obviously reduced with the increase of the pressure.Through rationally controlling pouring temperature,preheated temperature for mould and temperature distribution of the cast mould,the shrinkage porosity in the castings can be eliminated to obtain the castings with high and even mechanical properties.  
        关键词：Squeezing Casting;Castings with High Height-diameter Ratio;Mechanical Properties;Shrinkage Porosity   
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        发布时间：2023-12-18
      • Wu Wei Zou Zhihou Ma Chunyan Yang Lin Chen Lijia Liu Zheng
        Issue 10, (2005)
        摘要：Effects of processing parameters,including injection pressure at 380～420 MPa,mould temperature at 130～210 ℃ and punch velocity at 1.8～3.4 m/s,on the mechanical properties of AM50 Mg alloy in die casting were investigated.With proper processing parameters,the tensile strength,yield strength and elongation at room temperature of the AM50 Mg alloy can reach 238 MPa,122 MPa and 13.6%,respectively.  
        关键词：Mg Alloy;Die Casting;Mechanical Properties   
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        发布时间：2023-12-18
      • Chen Bing
        Issue 10, (2005)
        摘要：A new abrasion material-Al2O3 ceramics near to diamond in hardness was introduced.The abrasion material can be subjected to high pressure during abrasion so that the faster the abrasive velocity is,the longer the service life of the abrasive tool is.The advent of microreplication abrasive belt has changed the way of abrasive particle adhering on the substrate belt and added abrasive agent on the abrasive belt,which can improve the abrasive efficiency and extend the service life.  
        关键词：Abrasive Materials;Nano-Al2O3 Ceramics;Microreplication Abrasive Belt;Investment Castings Abrasion   
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        发布时间：2023-12-18
      • Xu Yunxiang
        Issue 10, (2005)
        摘要：Resins base pattern materials for sol silicate mold shell in investment casting will lead to the irregular cavity in castings surface due to the repetitive reclamation resulting in the over-standard of ash content in pattern materials.It is pointed out that pattern materials should avoid being polluted by powder ash and sand particle by any means during pattern-making and dewaxing,and deposition temperature and time should be properly increased during reclamation of pattern materials with static deposition.In addition,rational gating system can be helpful to reducing the ash-inclusion in wax pattern  
        关键词：Resins Base Pattern Materials;Wax Pattern;Pattern Reclamation   
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        发布时间：2023-12-18
      • Luo Shouxin Sheng YuhaiLiu Younian
        Issue 10, (2005)
        摘要：The mixed binder,which is composed of ethyl silicate solution,sol silicate and active alcohol,was applied for one to three layers of mold shells while the sodium silicate binder was applied for reinforced layer.The mixed binder for shell making has the advantages as follows: it dosen’t need NH4 chemical hardening and has faster drying time than sol silicate,which is low than 1 hour in drying time of layers.Using the mixed binder can shorten the shell making period,improve the quality of the investment casting,improve the work condition,and reduce the circumstance pollution and production cost.  
        关键词：Ethyl Silicate;Sol Silicate;Sodium Silicate;Alcohol;Mold Shell for Investment Casting   
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        发布时间：2023-12-18
      • Vol. 0, Issue 10, (2005)
          
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      • Chen Yaojian Huang Tianyou Kang Jinwu Zhang Jia
        Issue 10, (2005)
        摘要：Most interested research fields in lost foam casting is focused on aluminum and magnesium alloy,their defects formation mechanism,foam pattern making and quality description,white zone pattern making.These researches indicate that the pattern with low fusion degree in center,high fusion degree in surface,and uniform density and smooth surface are suitable for the production of high quality castings in lost foam casting.In addition,X ray,SEM and numerical simulation have been employed to the estimation and prediction of bead filling mold,pattern making and quality of finished pattern.  
        关键词：Lost Foam Casting;Al-Mg Alloy;Pattern Quality   
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        发布时间：2023-12-18
      • Li Shuangshou 1 Tang Jinglin 1 Zeng Daben 1 Wu Hanqi 2 Lü Shuo 2
        Issue 10, (2005)
        摘要：By observing the change of grain size of A356 alloy during holing,the incubation and fading of refinement on hypoeutectic Al-Si alloy were researched.Incubation of refinement is resulted from low solute supercooling degree during early stage of refinement.With the argument of the melt supercooling degree caused by solute Ti increase,more nucleated particles are activated to restrain the growth of dendrite.After long holding time,although the content of refining element Ti isn’t changed,refinement effect is fade due to the serious composition segregation and coarsing and disposition of nucleated particle resulting in the reduction of the active nucleation site.The incubation can be shortened or eliminated by using pre-refined alloy ingot.  
        关键词：Hypoeutectic Al-Si Alloy;Refinement;Incubation;Fading   
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        发布时间：2023-12-18
      • Li Minmin Zhang Henghua Shao Guangjie Xu Luoping Ma Zhuqing Zhang Xiannian
        Issue 10, (2005)
        摘要：The effects of different additions and holding time of Ti5B and Ti5C on the refinement of A356 alloy were examined by OP and universal testing machine.The experimental results show that both Ti5B and Ti5C master alloy can obviously refine the A356 alloy,more than 8 hours in fading time.The refinement effects of Ti5B is superior to that of Ti5C on the A356 alloys through comparing microstructure and mechanical properties of the castings.  
        关键词：Ti5B and Ti5C Master Alloy;Microstructure and Properties;A356 Alloy   
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        发布时间：2023-12-18
      • Wu Wei Su Yong Li Xiaoyun Chen Yiqing
        Issue 10, (2005)
        摘要：The microstructures of as-quenched and heat-treated Al 85Zr4Nb4Ni7 alloy ribbon prepared by rapidly solidified method were investigated by DSC,X ray and TEM.The results show that microstructure of the as-quenched alloy ribbon is composed of supersaturation α-Al,Al3Zr and metastable AlNiZr phase.A new Al3Ni phase is formed due to the decomposition of the AlNiZr phase after annealing at 400 ℃.An unknown phase comes out,and the crystal grains further grow coarse after annealing at 480 ℃.Meanwhile,the effects of Al3Zr and Al3Ni on the thermal stability of elevated Al 85Zr4Nb4Ni7 alloy were approached.  
        关键词：Rapid Solidification;Al-Zr-Nb-Ni Alloy;Microstructure;Thermal Stability   
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        发布时间：2023-12-18
      • Sun Guangmin
        Issue 10, (2005)
        摘要：The impeller for ship was manufactured with corrosion-resistance ZCuAl9Fe4Ni4Mn2 alloy.Compared to smelt by reflection furnace,the ZCuAl9Fe4Ni4Mn2 alloy smelted by main frequency furnace and industrial frequency furnace and using Al2O3 as substrate can realize low gas content and reduce oxidation burning loss to about 3%.Once-through pouring liquid Cu can reach 120 tons through multi-ladle pouring,in which it is necessary to reduce second-oxidation during pouring.To obtain the direction solidification microstructure of impeller,the elevated liquid Cu was used to feed the runner,which is helpful to the feeding when the liquid Cu reaches the distance from 1/3 runner.Using the above-mentioned measures,the qualified impeller can be successfully manufactured with the CO2-sodium silicate mold.  
        关键词：Al-Cu Alloy;Microstructure;Smelting   
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        发布时间：2023-12-18
      • Xu Jiping Ji Weizhi He Zhiqin
        Issue 10, (2005)
        摘要：The method of gears manufactured with high-intensity Zn-Al alloys in squeeze casting was introduced,especially for some gears with demands for ignition proof and flame-proof.The mold structure and making technology of using high-intensity Zn-Al alloys in squeeze casting is simple,reliable,low cost,having good economic benefits.  
        关键词：High Intensity Zn-Al Alloy;Gears;Squeeze Casting   
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        发布时间：2023-12-18
      • Vol. 0, Issue 10, (2005)
          
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      • Xie Jingpei 1 Yue Zongge 2 Wang Aiqin 1 Wang Wenyan 1 Li Jiwen 1 Li Luoli 1
        Issue 10, (2005)
        摘要：Microstructure characteristics of interface and wear resistance of SiCp/ZA27 composites have been investigated through selected area electron diffraction and EDS analysis by means of SEM and HREM.It is revealed that SiC particle uniformly distributes into ZA27 alloy with excellent interface bonding,and amounts of CuZn4 compound exist around SiC particle.CuZn4 can nucleate on SiC particle and grow up at a higher speed along SiC particle than in vertical direction.The wear resistance of ZA27 alloy can be increased remarkably due to the addition of SiC particles,and the wear resistance was raised by 126.5 times with the addition of 30% SiC particle volume fraction.  
        关键词：ZA27 Alloy;SiC Particles;CnZn4 Compound;Wear Resistance   
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      • Vol. 0, Issue 10, (2005)
          
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