最新刊期
      卷 ， 期 3 ， 2006
      • Xiong Chuangxian~ 1,2,Zhang Xinming~1,Jiang Hao~1
        Issue 3, Pages: 129-132(2006)
        摘要：Microstructure of water quenched as-cast MgY5Mn1Sc0.3 magnesium alloy and its microsructural evolution after solid solution at 520 ℃with different holding times were observed by OP（optical microscope）, SEM and XRD. The results show that the as-cast microstructure is composed of coarse grain, where amounts of plait-like twins crystal and linear-array particle phase occur, and the absence of dendrite and eutectic phase within grain and boundary is observed, meanwhile the Y element is severely segregated to enrich the second particle phase. After solid solution treatment, there occurs the microstructure evolution and recrystallization evolving spheroidization of grain, dissolution and congregation of dispersive phase, and the transformation of the grain. The effects of heat treatment on the experimental alloy were investigated by measuring the hardness HV100.  
        关键词：Magnesium Alloy;Recrystallization;Heat Treatment;Grain Refinement   
        2
        |
        206
        |
        4
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46167910 false
        发布时间：2023-12-18
      • Dou Zhihe,Zhang Ting’an,Yu Haien,Yang Huan,Liu Changsheng
        Issue 3, Pages: 133-135(2006)
        摘要：The CuCr alloy was prepared by the SHS electromagnetic casting using CuO and Cr2O3 as materials and Al powder as reducing agent. The effect mechanism of the electromagnetic stirring on the microstructure of CuCr alloy was analyzed. The calculated results show that the cooling process is the fast cooling of Newton Cooling. Electromagnetic stirring can improve the properties of the CuCr alloy by effectively inhibiting the growth of dendrite to refine grain size and homogenize the distribution of Cu and Cr in the alloy. The optimized stirring time is about 7 min because grain can not be effectively refined stirring time in excessively shorter, and in turn, it is easily generated composition segregation, choosing preheated temperature of cast mold for 500 ℃. Although Ni, Co can improve the dispersity and homogeneity of Cu and Cr in the alloy , it can result in coarsening grain size.  
        关键词：Contact Material;CuCr Alloy;Electromagnetic Casting;SEM;Stirring   
        2
        |
        201
        |
        2
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46167848 false
        发布时间：2023-12-18
      • Gao Hongwu,Liu Yu,Liu Shikui,Li Changmao,Liu Shunhua
        Issue 3, Pages: 136-138(2006)
        摘要：Formation characteristics, aperture configuration and dynamic change of gas hole in the early stages of foamed aluminum were investigated based on preparation of foamed aluminum by a new powder metallurgy method with immersing preformer and heating up rapidly. The results show that foaming process is characterized by micro-propagation to macro-propagation to collapse. The formation mechanism of micro-propagation of crack-gas-hole depends on the stress from H2 decomposed from TiH2, characterized by transverse crack in propagation direction and distributed within solid phase. Macro-propagation is attributed to the crack propagation and growth resulting from continuous decomposition of TiH2. The new method can reduce the heating time from 10 min to 30150 s, which effectively increase the dynamic mechanism of homogeneous foaming and improve the utilization ratio of TiH2.  
        关键词：Aluminum Foams;Powder Metallurgy;Immerging-making;TiH2;Initial Crack   
        2
        |
        247
        |
        1
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46168537 false
        发布时间：2023-12-18
      • Hu Zhongchao~1,Zhang Erlin~2,Zeng Songyan~1
        Issue 3, Pages: 139-141(2006)
        摘要：Spinning spraying processing used for degassing treatment of AZ91D Mg alloy was researched. Pressure-reduction solidification is used to assess the efficiency of the degassing process and the optimal degassing time is determined. The mechanical properties and the microstructure of the alloy samples before and after degassing treatment in metal mold casting and in low pressure sand casting were studied,respectively. The results show that the tensile strength of the alloy samples treated by spinning spraying for 30 min can be considerably improved both in metal mold casting and in low pressure sand casting, particularly sharply improved in elongation. Based on the experimental results, it is concluded that the spinning spraying can rapidly and obviously reduce the gas content in Mg alloy, improving the mechanical properties, which is a desirable processing for refining Mg alloy melt.  
        关键词：Mg Alloy;Degassing;Spinning Spraying;Mechanical Properties   
        2
        |
        278
        |
        7
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46169587 false
        发布时间：2023-12-18
      • Fang Yan,Liao Xiliang,Gan Changhong,Gong Yongyong,Zhai Qijie
        Issue 3, Pages: 141-143(2006)
        摘要：Effects of pulsed electric current with main frequency and low voltage on solidification structure of pure aluminum were investigated by the adjustment of peak intensity and frequency of pulsed current. The results reveal that the pulsed current with main frequency and low voltage can convert column crystal into equiaxed crystal in solidification of pure aluminum ranging in 5006 000 A of current peak value and 1001 000 Hz of frequency. With the increase of current peak value and frequency, equiaxed crystal is remarkably refined and its area is broadened.  
        关键词：Pulsed Current;Current Peak Value;Frequency;Grain Refinement   
        2
        |
        276
        |
        5
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46168962 false
        发布时间：2023-12-18
      • Zhang Baofeng,Wang Liguo,Geng Jiayuan,Zhang Mei,Guan Shaokang
        Issue 3, Pages: 144-146(2006)
        摘要：Effects of Si-Ca alloy on the microstructure and mechanical properties of Mg-6Al-0.5Mn alloys were studied by observing the microstructure and phase composition of the alloys using OM, SEM, EDS and XRD. The results show that dispersively distributed regular polygonal Mg2Si particles can be formed in AM60 Mg alloy with proper Si-Ca addition. The microstructure of the AM60 Mg alloy can be improved, where semi-continuous net Mg 17 Al 12 phase becomes fine and dispersive and the grain size can be refined obviously with the increase of the Si-Ca addition, and grain size is decreased by 80 μm from 180 μm. Improvement of mechanical properties of the alloy is contributed to the formation of the enhancing phase and refinement of the microstructure, where tensile strength, elongation, and impacting toughness are increased by 13.9%, 28.5% and 100%, respectively, with 1.8% Si content. It is also found that not only CaSi2 can be acted as heterogeneous nucleation site for primary Mg2Si, but also Al8Mn3 can do it.  
        关键词：Mg-Al-Mn Alloy;Si-Ca Alloy;Microstructure;Mechanical Properties;Heterogeneous Nucleation Site   
        2
        |
        172
        |
        3
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46168715 false
        发布时间：2023-12-18
      • Zhang Dan,Zhang Weihong,Zhu Jihong
        Issue 3, Pages: 147-149(2006)
        摘要：In order to effectively improve the accuracy of the numerical simulation, a new model for interfacial heat transfer coefficients （IHTC） is parameterized and modified. Based on this continuous IHTC model of three-step evolution, a new inverse method is proposed to evaluate IHTCs by combining the FEM numerical simulation with optimization calculation and measured temperature data dependent on position according to the nonuniformity air gap in the horizontal continuous casting. The numerical simulations of Sn-5Pb and Sn-15Pb alloys were conducted by the model. The results show that the simulated temperature is well in agreement with the measured temperature from three positions, and the maximum deviation is less than 5%.  
        关键词：Numerical Simulation;Horizontal Continuous Casting;Interfacial Heat Transfer Coefficient;Inverse Calculation   
        2
        |
        201
        |
        2
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46170389 false
        发布时间：2023-12-18
      • Li Zhongyuan~ 1,2
        Issue 3, Pages: 150-153(2006)
        摘要：Based on the control-volume method, a 3-D coupled model has been developed for binary iron-carbon alloy to describe the turbulent fluid flow, heat transfer, solidification, and solute redistribution in the thin slab in continuous casting. Calculated results show that the turbulent fluid flow intensively alters the shapes of temperature field and the solute distribution in thin slab. The impact of flow jet from immersed nozzle on broad face of the thin slab is responsible for un-even distribution of solidified shell thickness along broad face. The formation mechanism and potential position of macro-segregation are analyzed.  
        关键词：Continuous Casting Thin Slab;Turbulent Fluid Flow;Solidification;Macro-segregation;Couple Model   
        2
        |
        289
        |
        5
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46170241 false
        发布时间：2023-12-18
      • Peng Jishen,Ren Baodong
        Issue 3, Pages: 154-155(2006)
        摘要：Application of PLC and touching screen to the control system of die-casting machine was introduced. Meanwhile, the principle and function of PLC and touching screen for the system were analyzed.  
        关键词：PLC;Touching Screen;Die-casting Machine;Anti-interference   
        2
        |
        314
        |
        4
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46170636 false
        发布时间：2023-12-18
      • Zhang Datong,Long Yan,Li Yuanyuan
        Issue 3, Pages: 156-158(2006)
        摘要：Friction stirring welding （FSW） is a new joining technology, having many advantages of energy-saving, clean and high-efficiency, especially suitable for the joint of light metal. Friction stirring welding of aluminum alloy has been used in various industrial fields while research on FSW of magnesium alloy has just begun. Progress in FSW of magnesium alloys, including the processing, microstructure and properties of the solder is reviewed. The future tendency is prospected.  
        关键词：Magnesium Alloy;Friction Stir Welding;Microstructure;Properties   
        2
        |
        589
        |
        5
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46169481 false
        发布时间：2023-12-18
      • Tian Qin,Zhou Rongfeng,Jiang Yehua,Zhou Rong
        Issue 3, Pages: 159-161(2006)
        摘要：Effects of inclined angle on semi-solid microstructure of hypoeutectic high Cr cast iron prepared by inclined plate cooling method were investigated. The results show that the bigger or smaller inclined angle can cause the occurrence of coarse primary austenite crystal with low spheroidalization. Coarse primary austenite phase in dendrite is attributed to slower flow velocity of the liquid metal resulting in the full growth of primary phase companying with low scouring, impacting and shearing between dendrite and dendrite or dendrite and liquid metal with low inclined angle, while with high inclined angle, coarse dendrite austenite occurs due to faster flow velocity resulting in shortening flow time on inclined plate and shortening acting time of scouring, impacting and shearing in dendrites and between dendrite and liquid metal. Primary austenite phase in prepared hypoeutectic high Cr cast iron possesses the finest grain size and best speroidalization with inclined angle of 45°.  
        关键词：Inclined Angle;Cooling-body Method;Hypoeutectic High Cr Cast Iron;Primary Austenite   
        2
        |
        115
        |
        8
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46170285 false
        发布时间：2023-12-18
      • Xing Shuming~1,Tan Jianbo~1,Zhang Haiying~2,Zhang Lizhong~1,Bao Peiwei~2
        Issue 3, Pages: 161-165(2006)
        摘要：Rheologic filling of semi-solid alloy melt is defined as a process in which the semi-solid slurry poured into a die chamber is pressed into a mold cavity through a filling system including three basic units such as sprue, runner and ingate by means of the rheologic properties of semi-solid alloys. The filling process is composed of active rheology and passive rheology, possibly forming uniform filling and discretely filling. The discretely filling phenomen were observed with the pressure Pm in cavity more than cohesive force τ acted on the solid. Maximum filling length is dependent on cooling capacity of mould, microstructure and reheology of semi-solid slurry through theoretical analysis of origination of rheologic filling resistance and quantitative calculation equation. The evaluation equation for maximum filling length in gyroidal mold was given.  
        关键词：Semi-solid Alloy;Rheologic Filling;Processing Theory   
        2
        |
        307
        |
        6
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46170465 false
        发布时间：2023-12-18
      • Yu Haipeng,Song Hongwu,Yu Baoyi,Bao Chunling,Zhang Leixian
        Issue 3, Pages: 166-168(2006)
        摘要：Die castings and heat treatment were used to improve the strength and ductility of Al-Cu alloy with high strength and ductility. The as-cast properties of ZL201 alloy were improved by adding alloying elements B, Zr, V to conduct die casting. Experimental results reveal that the microstructure of the Al-Cu alloy is greatly refined in die casting, in which as-cast properties is higher than those in permanent casting. The strength of die cast alloy is equivalent to that of conventional high strength die cast aluminum alloy after low temperature ageing, while its plasticity is in creased by 29%.  
        关键词：High Strength and Ductility;Al-Cu Alloy;Die Casting;Microstructure;Properties   
        2
        |
        298
        |
        3
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46168599 false
        发布时间：2023-12-18
      • Vol. 0, Issue 3, Pages: 171(2006)
          
        2
        |
        85
        |
        1
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46170002 false
        发布时间：2023-12-18
      • Wang Tiezhu
        Issue 3, Pages: 172-173(2006)
        摘要：The mechanism of self-developed CO furnace and the whole system technology of diesel oil substituting for CO gas in baking furnace for mold shell were introduced.Baking furnace for mold shell with CO gas can greatly reduce the cost of investment castings,and improve the quality of baked mold shell.The equipment has the advantages of rational structure and better auto-control operation system as well as low investment and excellent benefit.  
        关键词：Investment Casting;Mold Shell;Baking Furnace;Automotive Control   
        2
        |
        39
        |
        0
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46169026 false
        发布时间：2023-12-18
      • Vol. 0, Issue 3, Pages: 174(2006)
          
        2
        |
        63
        |
        3
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46170694 false
        发布时间：2023-12-18
      • Wang Chengzhi~1,Hao Bo~1,Meng Xianjia~1,Yu Benhai~2,Yi Lülin~2
        Issue 3, Pages: 175-177(2006)
        摘要：Model knowledge database was established by using object-oriented knowledge representation based on referring the advanced design experiences from home and abroad to develop a intelligent CAD system for Al-Si piston in metal mold casting and its mould design, in which case-based reasoning was adopted to establish a case prototype-based KBS. General design expert system with traditional CAD system interface was realized by developing text joint program, realizing the intelligent design. The effectiveness and feasibility of the system was verified by comparing with the used design system.  
        关键词：Piston;Expert System;Case-based Reasoning;Object-oriented Knowledge Representation   
        2
        |
        257
        |
        1
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46169322 false
        发布时间：2023-12-18
      • Yu Chenglin,Bao Xiaolin
        Issue 3, Pages: 177-178(2006)
        摘要：There are strict requirements for internal quality of 205A alloy framework casting, so cast CAE software is employed to optimize the gating systems and Ar rotating spraying was used for improving the purification degree of the 205A alloy melt to eliminate pinhole and inclusion within the castings, assuring the quality of the ZL205A alloy framework castings.  
          
        2
        |
        54
        |
        1
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46169227 false
        发布时间：2023-12-18
      • Huang Huizhen,Huang Qisen,Peng Shu,Zhou Lang
        Issue 3, Pages: 179-181(2006)
        摘要：Effects of Ag addition on the wettability on the copper surface, shear strength of solder joints, creep strength and microstructure of Sn-9Zn lead-free solder alloys have been investigated experimentally. The results show that lower Ag addition can improve the wettability and shearing strength of solder joints of Sn-9Zn alloy melt on the Cu surface while higher Ag addition can be inferior to them. There exists an optimum Ag content ranging from 0.3 % to 0.6% for wettability and shearing strength of solder joints. The creep strength of Sn-9Zn solder alloys can be increased by the addition of Ag, which may be attributed to the micrometer-sized dispersed Ag-Zn particles formed in the bulk of Sn-9Zn-xAg solder alloy.  
        关键词：Lead-free Solder;Sn-9Zn;Ag;Wettability;Creep   
        2
        |
        216
        |
        6
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46169540 false
        发布时间：2023-12-18
      • Ye Shengping,Wu Zhichao
        Issue 3, Pages: 182-184(2006)
        摘要：Dosens of art castings in lost foam casting from foreign Countries were exhibited. The practical art casting of copper bell in lost foam casting from the research institute and enterprises were described.  
        关键词：Art Castings;Lost Foam Casting;Copper Bell   
        2
        |
        191
        |
        1
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46170531 false
        发布时间：2023-12-18
      • Zhou Xun,Chen Wenge,Gu Chenqing,Luo Qiwen
        Issue 3, Pages: 185-187(2006)
        摘要：Al2O3 particle and fibre hybrid reinforced aluminum matrix composites were prepared by the extruding-infiltration method. Effects of cryogenic treatment on microstructure and mechanical properties of the composites were understood by X-ray and SEM. The results show that although the hardness is decreased, tensile strength of the composites is increased, showing somewhat brittle fracture, which is relevant to Si phase change before-and-after cryogenic treatment.  
        关键词：Aluminum Matrix Ceramic Composites;Cryogenic Treatment;Microstructure   
        2
        |
        275
        |
        5
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46168652 false
        发布时间：2023-12-18
      • Yang Shaofeng~1,Xu Guangji~2,Zhang Suimeng~1,Ding Yutian~2
        Issue 3, Pages: 188-191(2006)
        摘要：CuAlNi shape memory alloy with column crystal was fabricated by heat mould continuous casting in order to improve the properties of the alloy by altering its structure constituent. Effects of column crystal on the properties of the CuAlNi shape memory alloy and the mechanism of the alloy property improvement were investigated. The experimental results reveal that the heat mould continuous casting can produce successfully the CuAlNi shape memory alloy with column crystal, which proposes an excellent method for industrial production.  
        关键词：Heat Mould Continuous Casting;CuAlNi Shape Memory Alloy;Shape Memory;Column Crystal   
        2
        |
        192
        |
        2
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46168821 false
        发布时间：2023-12-18
      • Yi Panfeng,Feng Chungui
        Issue 3, Pages: 191-192(2006)
        摘要：Origination of crack in hollow pure Al ingot with large diameter in centrifugal casting was analyzed from the aspects of Fe/Si ratio in raw materials, rotating velocity of cast mould, preheating temperature, pouring temperature of liquid Al and cooling rate based on practical experience in the combination of theoretical analysis, and the countermeasures were proposed. The formation mechanism and influenctial factors of the crack were investigated, and the effective countermeasures were given.  
        关键词：Aluminum Ingot;Rotating Velocity;Crack;Pouring Temperature;Cooling Rate   
        2
        |
        76
        |
        0
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46169936 false
        发布时间：2023-12-18
      • Vol. 0, Issue 3, Pages: 193(2006)
          
        2
        |
        23
        |
        0
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46170014 false
        发布时间：2023-12-18
      • Vol. 0, Issue 3, Pages: 194(2006)
          
        2
        |
        18
        |
        0
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 46170030 false
        发布时间：2023-12-18
      0