最新刊期
      卷 ， 期 8 ， 2005
      • Huang Zhifu~1 Zhang Anfeng~1 Xing Jiandong~1 Huang Weidong~2
        Issue 8, Pages: 449-450(2005)
        摘要：The microstructure of semi-solid annular specimen prepared by inclined cooling body-centrifugal casting was observed.It was found that compared with those of the specimen obtained by conventional forming method,primary austenite in the semi-solid high Cr white cast iron becomes fine and equiaxed.The morphology and distribution of primary austenite in the semi-solid high Cr white cast iron are changed with the distance increase from the outer profile of the annular specimen,divided into four regions from external layer to internal layer,such as fine small austenite dendrite region,interface region of primary equiaxed austenite region and fine small dendritic austenite region and primary equiaxed austenite region,bulky primary dendritic austenite region,in which interface region lies about 10～15 mm from outer profile.  
        关键词：Inclined Cooling Body-centrifugal Casting;High Cr Cast Iron;Semi-solid Gradient Microstructure;Primary Austenite   
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        发布时间：2023-12-18
      • Li Yinglong Cao Furong Shi Lu Wen Jinglin
        Issue 8, Pages: 451-453(2005)
        摘要：Microstructure of Al-Ti-C master alloy prepared by liquid-solid reaction method were observed through SEM analysis,and the optimized scope of chemical composition was determined through the comparison of the refining effects of Al-Ti-C master alloy with various ration of Ti to C.The nucleation undercooling rate of aluminum melt,the driving force of nucleation and growth and refining mechanism of alpha aluminum phase during solidification were analyzed.The results showed that refining effects is dependent on the comprehensive role among TiC quantity,nucleation activity and the restrained factors for grain growth.  
        关键词：Al-Ti-C Master Alloy;Composition and Microstructure;Alpha Aluminum Refining Mechanism   
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        发布时间：2023-12-18
      • Chen Jingyang Guan Shaokang Shi Guangxin Zhang Chunxiang
        Issue 8, Pages: 454-456(2005)
        摘要：Effects of B on microstructure and mechanical properties of Mg-7Al-0.4Zn-0.2Mn alloy were investigated.It was found the as-cast microstructure and average grain size are remarkably refined with trace B addition,exhibiting more strongly refining effects with increase of the B content.The average grain size was decreased from about 140μm without B alloy to 40μm with 0.15% B addition.It was concluded that the grain size was refined due to the high melt point compound AlB2 with HCP crystal structure serving as the heterogeneous nuclei site.The mechanical properties of the as-cast alloys are increased with trace B addition.The microhardness,tensile strength and yield strength of the alloy with 0.15% B addition were increased by 13.1%,19.5% and 22.0%,respectively,comparing with those of the alloy without B addition,and the energy to fracture is 2.3 times than that of the alloy without B addition.Elongation of the alloy with 0.10% B content is increased by 21.6% comparing with that of as-cast alloy.  
        关键词：Mg-7Al-0.4Zn-0.2Mn Alloy;Al-3B Compound;Grain Refinement;Microstructure;Mechanical Properties   
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        发布时间：2023-12-18
      • Gao Hongwu Liu Shikun Zhao Yanbo Liu Shunhua
        Issue 8, Pages: 457-459(2005)
        摘要：A new foaming method for preparation of foamed aluminum alloy by immersible foaming and effects its variables on foaming were investigated.The foamed aluminum alloy with uniform bubbles and controllable gas-hole can be manufactured with pure commercial aluminum and TiH2 powder at immersible temperature of 680～760 ℃ for immersible time of 10～30 s and holding time of 10～60 s.The results showed that powder metallurgy with immersible foaming is a perspective method for preparation of foamed aluminum alloy,possessing the features of high efficiency,even structure and hihg TiH2 using ate.  
        关键词：Foamed Aluminum Alloy;Immerge;Powder Metallurgy;Uniform Structure Properties   
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        发布时间：2023-12-18
      • Chen Liping Si Naichao
        Issue 8, Pages: 459-461(2005)
        摘要：Thermal expansion behaviors of variously heat treated CuZnAl shape memory alloy （SMA） were measured by thermalilatometry and differential scanning calorimetry （DSC）.It was revealed that heat treated CuZnAl shape memory alloy not only possesses different shape memory effects but also exhibits various thermal expansion behavior at different temperatures.During the martensitic reversible transformation,the peak value of the coefficient of thermal expansion （CTE） of CuZnAl occurs,and the CTE of CuZnAl SMA by water quenching is higher than that of by step quenching.After phase transformation,the CTE of CuZnAl SMA by step quenching is lower than that of by water quenching ranging from 80 to 240 ℃.The CTE is decreased with the increase of temperature in the temperature ranges either water quenching or step quenching.Also the peak of the CTE occurs ranging from ranges of 240 to 280 ℃ due to the existence of a few of bainite phase.Therefore,both the methods of quenching and the ageing time can influence the CTE in CuZnAl SMA.  
        关键词：Shape Memory Alloy;Thermal Expansion;Reversible Martensitic Transformation   
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        发布时间：2023-12-18
      • Chen Yuyong Xu Lijuan Chen Ziyong Xiao Baichun
        Issue 8, Pages: 462-464(2005)
        摘要：The relationships between baking temperature of self-developed prosthodontia investment and expansion rate,expansion coefficient as well as and solidifying time,tensile strength were investigated,and the interface reaction of investment material with pure Ti at ambient temperature one-cladding was observed.The result shows that the investment materials can completely meet the requirement of actual false teeth manufacturing due to its maximum solidifying expansion rate of 0.1% and thermal expansion rate of 0.46[WTXT]% at 800 ℃ as well as totally expansion rate of 0.56%.Tensile strength of baked materials is in the range of 0.3～0.35 MPa,and the tensile strength of the materials is 2.35 MPa after solidified for 24 hours,which can meet the demand of casting process.Zr and P can be ignored due to its little diffusion in pure Ti.The castings quality can be controlled by surface treatment for Mg spreading depth of 6 μm,Al of 20μm and Si of 15 μm in the cast Ti system.  
        关键词：Investment;Solidifying Expansion;Thermal Expansion;Reaction Layer   
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        发布时间：2023-12-18
      • Liu Chuming Zhang Jing Li Huizhong Zhou Haitao Chen Ming’an
        Issue 8, Pages: 465-468(2005)
        摘要：A kind of Cu-15.5Sn-5P-4.5Ni-0.4Mn brazing filler metal powder produced by gas atomization was used to weld T1 copper plate at 685 ℃ for 20 min,in which the joint length is 6mm and brazing gap thickness is 0.3 mm.The brazing filler melting point,microstructure and mechanical properties of joining were research.It was revealed that grain size of brazing filler metal powder is lower than 10 μm,and solidius and liquidius temperature is 576 ℃ and 596 ℃ respectively from DTA measurement,and the shearing strength is （176.965 MPa,）and the fracture mechanism exhibits quasi-cleavage fracture.A regression mathematical model on relation among shearing strength,solid-liquid temperature and chemical composition is built up through optimized design for chemical composition of the brazing filler metal powder based on a amount of experimental data from mechanical properties,melting point and corresponding chemical composition.The model is available for the alloy due to the difference between calculated value and measured ones lower than 5%.  
        关键词：Multivariate Linear Regression;Composition;Shearing Strength;Melting Point;Fine Grain   
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        发布时间：2023-12-18
      • Yue Liuzhen~1 Ni Feng~1 Zhang Yongzhen~1 Long Rui~2
        Issue 8, Pages: 469-472(2005)
        摘要：A physical-mathematical one-dimensional model of heat transfer in steady process of Ohno continuous casting was built up based on the principle of Ohno continuous casting.The effects of processing parameters,including mold temperature,cooling distance,drawing velocity and spraying cooling intensity,on the solid-liquid surface position of the billet were calculated.The calculated results is well in agreement with experimental ones.  
        关键词：Ohno Continuous Casting;Heat Transfer Model;Numerical Analysis;Liquid-solid Interface   
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        发布时间：2023-12-18
      • Zhang Guangming Wang Zezhong
        Issue 8, Pages: 473-475(2005)
        摘要：Aiming at the special solidification characteristics of magnesium alloys and the opacity of the metal mould,a taper gating system for die casting die of magnesium alloy computer house parts were designed with Pro/E software.Pouring conditions using the gating system for AZ91D magnesium alloy were approached.Simulated results show that obtained parts has few defects,such as inclusion and cold shut due to smooth mold filling and uniform distribution of temperature field.  
        关键词：CAE;Die Casting Die;Numerical Simulation;Magnesium Alloy;Gating System   
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        发布时间：2023-12-18
      • Chen Bing
        Issue 8, Pages: 476-478(2005)
        摘要：Basic principle of smelting with inert atmosphere protection is as following: liquid inert atmosphere was dripped or covered on the surface of molten pool to decrease the oxygen content in gas through driving out the gas on molten-pool,avoiding the liquid alloy oxidation and gas-absorption.Using the technology,not only the impurities,gas hole and inclusion-slag can be obviously decreased but also the misrun and cold shut were reduced due to the improvement of purity of liquid alloy resulting in the good fluidity.  
        关键词：Alloy Smelting;Inert Gases;Oxygen;Casting Defects   
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        发布时间：2023-12-18
      • Min Xiaojun Li Ning He Yiming
        Issue 8, Pages: 479-480(2005)
        摘要：The application of phosphate bindering self-hardening mold core in investment casting was introduced.Using the mold core,the nozzle with narrow gap and nozzle with long-fine round hole for boiler can be successfully manufactured.The practical verification shows that the mold core has the advantages of excellent forming ability and low cost as well as convenience,but the mold core is not easy to release from the mould in permanent mold casting.  
        关键词：Investment Casting Mold Core;Phosphate;Binder;Self-hardening   
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        发布时间：2023-12-18
      • Jing Zongliang Huang Jiahua
        Issue 8, Pages: 481-482(2005)
        摘要：The investment castings with deep slot hole having clear surface were successfully manufactured with sand-slurry self-hardening core,in which self-hardening core adopted JXR powder material from special plant.The results showed that sand slurry for self-hardening core can be simply made up,and mold core can be easily cleaned.  
        关键词：Investment Casting;Mold Core;Self-hardening   
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        发布时间：2023-12-18
      • Gu Jinsheng
        Issue 8, Pages: 482-484(2005)
        摘要：The measurements for mechanical properties of testing bar were conducted.The results shows that tensile strength of major flat bars are slightly higher than that of round bar at the same processing parameters.The processing parameters have the significant effects on the mechanical properties for a identical materials and die casting components.The hearted part microstructure has the obvious effects on the tensile strength while chilling surface microstructure has the slight effect.The conventional defects occurred in heart part lower more affects the mechanical properties than in surface.  
        关键词：Die Casting Component;Bar;Mechanical Properties   
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        发布时间：2023-12-18
      • Hou Xiaoxia Yang Hua Zhao Yan Li Shitong [WT]
        Issue 8, Pages: 485-487(2005)
        摘要：The hot dip aluminum has been carried out to research the formation and dissolution of the intermetallic layer between die casting die and aluminum alloy.The experimental results show that the formation and dissolution of the intermetallic phase is a cyclic process.The interaction between formation and dissolution of the intermetallic layer results in weight loss and volumetric loss of the die steel substrate.  
        关键词：Die Casting Die;Aluminum Alloy;Intermetallic Phase;Failure   
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        发布时间：2023-12-18
      • Zhang Zhongming Xu Chunjie
        Issue 8, Pages: 488-489(2005)
        摘要：In order to improve the performance of water base coating for lost foam casting,the effects of xanthan gum on the performance of the coating were investigated.Experimental results showed that proper xanthan gum addition can significantly increase suspension capacity and coating layer strength,and improve coating adhesion and brushibility as well as viscosity while decreases slightly the coating permeability.It was believed that the xanthan gum can be widely used in water base coating.  
        关键词：Xanthan Gum;Coating;Lost Foam Casting   
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        发布时间：2023-12-18
      • Feng Xiaoming Wang Xuran Guo Congsheng Xia Pengju Wang Zhong
        Issue 8, Pages: 490-491(2005)
        摘要：The experiences of nodular graphite QT500-8 parts in lost foam casting were summarized.The predominant factors influencing parts were proposed.The planet gear framework for Automobile with high precision and low scrap rate,cost-efficient can be successfully manufactured in lost foam casting.  
        关键词：Lost Foam Casting;Nodular Graphite Iron;Castings   
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        发布时间：2023-12-18
      • Xiao Xiaofeng Ye Shengping Wu Zhichao
        Issue 8, Pages: 492-493(2005)
        摘要：Compared with hand-made mould,using three dimensional CAD/CAM software,not only the manufacturing period of mould can be shortened but also the foamed pattern can fully meet the design ideal,in which the irregular curve face and fillet as well as uniform walled-thickness can be assured so that the pattern deformation can be restricted in subsequently pouring process to improve the mechanical properties of the components.The design and manufacturing of foamed pattern for 18686-C type gear box in lost foam casting were completed.It was verified that the pattern can fully meet the design requirement,realizing the batches of production.  
        关键词：Foamed Pattern;Lost Foam Casting;CAD/CAM   
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        发布时间：2023-12-18
      • Zhang Youshou~
        Issue 8, Pages: 494-495(2005)
        摘要：A new binder for making sand mold or core suitable for low melting point metal or alloy,such as aluminum alloy,and its hardening process were investigated.The sand mold or core with good collapsibility can be obtained due to having higher strength in surface layer and lower strength in hearted part,which is benefit for cleaning sand on components.The binder exhibits good collapsibility and pollution free behavior compared with organic binder.  
        关键词：Aluminum Alloy;Phosphate Binder;Collapsibility;Heat-hardening   
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        发布时间：2023-12-18
      • Liu Gangqiang~1 Chen Leping~2 Ai Yunlong~2
        Issue 8, Pages: 496-498(2005)
        摘要：The effects of different Y contents on microstructure of ZM5 Mg alloy were investigated by optical microscope and SEM and EPA.It was found that 2[WTXT]%[WT] Y addition can obviously improve the microstructure of the ZM5 Mg alloy.X ray diffusion and OM observation indicated as-cast microstructure of the alloy consitsts of α-Mg phase and net-like β-Mg12Al17 phase in boundary,in which solid solution treated β-Mg12Al17 phase was dispersed in the matrix,in turn,microstructure of ZM5 alloy containing Re element Y consists of α phase,β-Mg12Al17 phase and particle MgY phase.Solid solution treated alloy consists of MgY phase and precipitated Al2Y phase.SEM showed that ZM5 Mg alloy possesses the features of cleavage fracture while ZM5 Mg alloy containing Y has mixed fracture morphology of quasi-cleavage fracture and boundary fracture.The reason is that enhancing phase MgY and dispersely precipitated phase transform the fracture morphology.  
        关键词：RE;ZM5 Mg Alloy;Microstructure;Solid Solution;Properties   
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        发布时间：2023-12-18
      • Wang Yanrui Liu Ping Lei Jingguo Kang Buxi Tian Baohong
        Issue 8, Pages: 499-501(2005)
        摘要：Effects of ageing variables and deformation degree on the mechanical properties of Cu-0.1Ag-0.46Cr alloy were investigated.It was revealed that the alloy can possesses higher electric conductivity and hardness with ageing at 520 ℃ for 1h after solid solution at 940 ℃ for 20 min.The cold deformation can obviously improve the hardness of the alloy without ageing treatment.The peak hardness and electric conductivity of 60% cold deformed alloy are 146.71 HV and 52.9 MS/m respectively with ageing at 480℃ for 30min while the values are only 123.59HV and 46 MS/m with direct ageing after solid solution treatment.The microhardness and electric conductivity can be remarkably improved with quenching at 650 ℃ for 20s in alkaline solution after solid solution treatment  
        关键词：Cu-Ag-Cr Alloy;Cold Deformation;Ageing;Alkaline Solution;Electric Conductivity;Microhardness   
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        发布时间：2023-12-18
      • Li Guirong Dai Qixun Zhao Yutao Wang Hongming
        Issue 8, Pages: 502-504(2005)
        摘要：(Al2O3+Al3Zr)p/A356 composites were synthesized by melt-reaction in A356-Zr（CO3） system with electromagnetic stirring.Observation of solidified microstructure by SEM show that the volume fraction and dispersity of reinforced particulate with the size of 1～3 μm in matrix can be improved with the stirring intensity increasing due to the electromagnetic stirring promoting heat transfer and solute diffusion to improve in-situ synthesized kinetics.Meanwhile,co-action of electromagnetic stirring and in-situ particulate results in the transformation of Si phase from sheet primary Si to needle-like or fine-rod eutectic Si.  
        关键词：Electromagnetic Stirring Method;Al Matrix Composites;Eutectic Si   
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        发布时间：2023-12-18
      • Tian Zhanfeng Xu Jun Yang Bicheng Zhang Zhifeng Shi Likai
        Issue 8, Pages: 504-506(2005)
        摘要：We have developed a thixoforming pilot-plant-scale equipment to perform semi-solid thixoforming for pump lid using A357 alloy and a new developed Al-6Si-2Mg alloy.The microstructure and mechanical properties of the two alloys were compared during the process of SSM billets preparation,reheating and semi-solid die casting.It was revealed that the Al-6Si-2Mg alloy exhibits better processing controllability during thixoforming compared with the A357 alloy.The properties of heat treated components by semi-solid thixoforming is tensile strength of 335 MPa,yield strength of 305 MPa and elongation of 3%[WT],higher than A357 alloy in strength,equal to A357 alloy in elongation.Finally,auto parts produced by semi-solid die casting with ideal filling,excellent properties and uniform microstructure were achieved.  
        关键词：Semi-solid Metal;Electromagnetic Stirring;Reheating;Thixoforming   
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        发布时间：2023-12-18
      • Zhang Xiannian Zhang Henghua Shao Guangjie Xu Luoping
        Issue 8, Pages: 507-510(2005)
        摘要：A searler viscometer for semi-sold metal has been developed based on the measurement principle of co-axial cylinder rotating.Measuring precision of the viscometer can be verified by measuring viscosity of the glycerin.The measured values are identical with the data from the literature at three different temperatures.The rheological behavior of the semi-solid A356 aluminum alloy slurry was examined by the viscometer.The results shows that the apparent viscosity of A356 aluminum alloy in steady-state decrease with the increase of the shear rate under isothermal shearing condition.The lower the temperature of the slurry is,the more obvious the pseudo-plasticity is.The slurry exhibits Newtonian manner at high shear rate with lower than 10% solid volume fraction.During the continuous shearing at a constant shear rate,the apparent viscosity gradually increase at begin,then sharply increase with temperature decrease.The cooling rate has a remarkable effect on the apparent viscosity of the semi-solid alloy slurry.  
        关键词：Semi-solid Metal;Viscometer;Apparent Viscosity;Shearing Rate   
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        发布时间：2023-12-18
      • Zhang Shengquan Hou Xingang
        Issue 8, Pages: 510-512(2005)
        摘要：The countermeasures and elimination of defects were proposed based on the analysis of the reason forming defects in cylinder components in metal mould casting.The countermeasures were applied to eliminated or reduce the gas hole,inclusion-slag and slag gas-hole resulting from un-rational gating system design,low pouring temperature and irregular pouring operation as well as high circumstance humidity leading to liquid Fe oxidation and high gas content.Reducing graphite nuclei and improving cooling rate can abolish the un-qualified graphite morphology.Sanntic sweat can be reduced or eliminated by extending mould-opened time.Cleaning cast mould and reducing liquid Fe oxidation can eliminate point of slow iron.Improving CE in liquid Fe and strengthening inoculation and abolished surface clips,and the P eutectic region can be eliminated by setting rational gating system.  
        关键词：Metal Mould;Defects;">   
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        发布时间：2023-12-18
      • Vol. 0, Issue 8, Pages: 513(2005)
          
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      • Vol. 0, Issue 8, Pages: 514(2005)
          
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