最新刊期
      卷 ， 期 4 ， 2003
      • Wei Zhongshan Wang Min Zuo Dunwen Li Liang
        Issue 4, Pages: 1-3(2003)
        摘要：The surface treatment for TC4 alloy was conducted by ME VVA ion implantation method. The changes of surface roughness of TC4 alloy impla nted by varying La + , Mo + volume were measured. It is found that impl antation of the ion results in decreasing the values of height parameters of the surface roughness, and the more the implanted doses increase, the more the parameters decrease, and also the Mo + implantation effects slightly ex ceed La + . The surface morphology of the alloy was improved. The effective mecha nism of the ion implantation on the surface roughness was analyzed with the sput ter theory.  
        关键词：Ti Alloy;Metallic Ion Implantation;Surface Roughness   
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        发布时间：2023-12-18
      • Cheng Hefa
        Issue 4, Pages: 3-5(2003)
        摘要：Open cell ZL104 foam aluminum alloy and aluminum foam were prepared with in filtration process. The measurement of the density in v arious position found that there exists density gradient from top to bottom in b oth of fabricated foam blocks and the distinct difference between the densities in different regions depends on the solidification sequence. Moreover, the compr essive experiments for ZL104 foam alloy and aluminum foam with different densi ties were conducted. The results showed that the density has a significant effec t on compressive and energy absorbing behavior. Although the density of Z L104 foam alloy is lower than that of the pure aluminum foam, the former has h igher compressive and energy absorbing behavior than the latter.  
        关键词：Foamed ZL104 Alloy;Density Gradient;Compressive Pro perty   
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        发布时间：2023-12-18
      • Wei Xiaowei Shen Baolu o
        Issue 4, Pages: 6-8(2003)
        摘要：The microstructural evolution of as cast ZA27 alloy wa s investigated during compressive creep under 30 MPa at 160 ℃ by means of X ra y diffraction and SEM. The results showed that compressive creep induced decompo sition of a metastable η′ phase and the occurrence of a four phase transforma tion, α+ε→T+η, with volume expansion during testing, resulting in negativ ecreep in the alloy. The lamellar microstructure evolved into spheroidal microst ructure in the alloy with the increase in compressive creep strain, which provid ed an evidence of phase transformation during aging process.  
        关键词：Compressive Creep;Microstructure;ZA27 Alloy   
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        发布时间：2023-12-18
      • Cheng Xiaomin Tao Yinglong Zhang Lianmeng
        Issue 4, Pages: 8-9(2003)
        摘要：Al 2 O 3 /Al Si composites were fabricated by the reaction of SiO 2 glass powder with molten aluminum. Effects of SiO 2 addition, reaction temperature and time on reaction speed were investiga ted. The microstructure of the composites were observed at various reaction temp eratures and holding times. It was found that SiO 2 fully reacted with Al t o generate uniform Al 2 O 3 /Al compound layer with lower SiO 2 add ition while reaction speed decreased with higher SiO 2 addition. The fastes t reaction speed occurred at holding time for 6～8 h, subsquently decreased. Com pound layer greatly increased with the increase in reaction temperature.  
        关键词：In situ Reaction;SiO 2;Al 2 O 3 /Al Composites in Situ   
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        发布时间：2023-12-18
      • Wang Huaiguo Zhang Jingxin Zhang Ku i Xu Jun Shi Likai
        Issue 4, Pages: 10-13(2003)
        摘要：Microstructural evolution of AZ91D extruded feedstock a nd the mechanism of liquid phase formation during reheating were investigated. Liquid volume fraction related to the recrystallized microstructu re was examined. The results showed that increase in reheating rate can refine r ecrystallized grain and increase liquid volume fraction under certain condition so as to improve the thixotropy of the feedstock. The connecting rod of air comp ressor for motor car was made by semi solid process and the quality of the die castings wa s evaluated.  
        关键词：AZ91D Mg Alloy;Reheating;Microstructural Evolution Mechanism;Semi Solid Die Casting   
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        发布时间：2023-12-18
      • Liu Xiaotao Zhang Ting’an Cui Jianzhong
        Issue 4, Pages: 14-15(2003)
        摘要：Correlating combustion synthesis with traditional weldi ng technology, the formation process of welding seam of 08Al steel/1Cr18Ni9 stai nless steel welded with joint materials of Ti Ni system was investigated. The p rocess of pressurized combustion synthesis of Ti Ni and the mechanism of its pr oduct formation, joint behavior between matrix and weld seam and fracture morpho logy of the seam were explored to develop a new preparation technique for cladding metal composites.  
        关键词：Combustion Synthesis;Welding;Cladding Metal;Joint   
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        发布时间：2023-12-18
      • Liu Guili Li Rongde
        Issue 4, Pages: 16-17(2003)
        摘要：The model of relation between processing parameters and mechanical properties for ZA27 alloy in extrusion casting was established on th e basis of artificial nervous network. Optimization of processing parameters for ZA27 alloy in extrusion casting was conducted by means of annealing arithmetic simulation. The results showed that ZA27 alloy possessed higher comprehensive pr operties with 40MPa specific pressure, mold temperature at 230～240℃,pouring te mperature at 540～550 ℃, holding pressure time for about 50s.  
        关键词：Artificial Nervous Network;ZA27 Alloy;Optimization   
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        发布时间：2023-12-18
      • Li Qiang Mo Chunli Li Dianzhon g Qian Bainian
        Issue 4, Pages: 18-21(2003)
        摘要：The effects of natural convection on the microstructure in Fe C binary alloy ingot during solidification process were simulated. First ly, finite differential method was used to calculate macro temperature field an d velocity field as well as solute transfer. Microstructural evolution of the in got was simulated by above calculated known value coupled cellular automation（CA）. The simulation results showed that natural convection can change the distribution of te mperature, solute and velocity field in the ingot during cooling and solidificat ion process so as to affect the evolution of solidified microstructure.  
        关键词：Simulation;Natural Convection;Microstructural Evolution   
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        发布时间：2023-12-18
      • Yan Jianjun Xu Yanlong Lin Hantong Li Zhigang Wang Gengyun
        Issue 4, Pages: 22-24(2003)
        摘要：Molding tool CAD system for gyrorotor parts in low pres sure casting based on UG software with oriented assemble, relative design and co ncurrent design was developed. The system can effectively prevent assembly from potential conflict and improve design efficiency and quality.  
        关键词：Low Pressure Die Casting;Concurrence Design;UG   
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        发布时间：2023-12-18
      • Cao Hui Zheng Xianshu
        Issue 4, Pages: 24-26(2003)
        摘要：Based on the entity shape molding and Object Or iented Programming method, a modeling of temperature field during solidification pro cess was developed for handling the complicated boundary conditions and casting shape with varying assigned time steps, irregular mesh sizes and physical proper ty variables to improve the calculated accuracy and efficiency.  
        关键词：Entity Shape Molding;Temperature Field;Numerical Simulation   
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        发布时间：2023-12-18
      • Gao Yulai Shen Jun Sun Jianfei Wang GangZhou Bide Li Qingchun
        Issue 4, Pages: 27-29(2003)
        摘要：Bulk amorphous alloy possessed high strength and hardne ss as well as excellent magnetic property. There existed a super cooling temper ature interval with Newton flow state for the alloy capable of super plastic fo rming. A series of excellent properties of the bulk amorphous alloy were surveye d. And the present different preparation methods for bulk amorphous alloy were c ompared. It is pointed out that the rapidly solidified powder metallurgy has great signi ficance in the preparation field of the bulk amorphous alloy.  
        关键词：Bulk Amorphous Alloy;Metal Glass;Rapidly Solidified Powder Metallurgy   
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        发布时间：2023-12-18
      • Dong Xuanpu Fan Zitian Huang Naiyu Wu Hebao
        Issue 4, Pages: 30-32(2003)
        摘要：Traditional foundry technologies for Mg alloy were surv eyed. The merits and deficiency of Mg alloy in lost foam casting were analyzed o bjectively. A new lost foam casting under controllable atmosphere and pressure f or moltem Mg alloy forming was presented. The technology very suitable for Mg al loy in precision casting possessed superiorities of lower investments and cost, higher quality and accuracy, higher productivity. In addition, the difficulties susceptible to oxidation and flaming during liquid Mg alloy forming can be effe ctive overcome.  
        关键词：Mg Alloy;Lost Foam Casting;Controllable Atmosphere and Pres sure;Precision Forming   
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        发布时间：2023-12-18
      • Si Yufeng Meng Lihua Wang Zhaowen Chen Yuyong
        Issue 4, Pages: 33-35(2003)
        摘要：The research situation on Ti 3Al base intermetallic co mpound and microstructures\|mechanical properties of its alloy as well as effect ive factors were surveyed.The smelting technology and casting characteristics we re emphatically introduced.Finally, the prospects of Ti 3 Al base interm etallic compound to be used in aerospace and astronautic and c ivil fields were expounded.  
        关键词：Ti 3 Al Base Intermetallic Compound;Ti 3 Al;Ti 2 AlNb;Microstructure Property   
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        发布时间：2023-12-18
      • Meng Xianjia Wang Chengzhi Deng Ziyu Wang Xiaofang Wang Rui
        Issue 4, Pages: 36-39(2003)
        摘要：Intelligent CAD system of die casting mould is explored . Theoretical model for design expert system is established. The created tools f or the e xpert system suitable for design of die casting mould are developed and the know ledge database was created. The graphic output system of die casting mould is de veloped, and then the application program of data interface for ES （expert syste m） with die CAD system is set up by using ADS language to realize the expert sys tem conversion from data form to graphic form and intelligent design for die cas ting mould.  
        关键词：Die Casting;Die Casting Mould;Expert System;Die Mould CAD   
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        发布时间：2023-12-18
      • Li Shikai Song Kexing Gao Jianxin Yuan Wei Yang Yong
        Issue 4, Pages: 39-40(2003)
        摘要：The microstructure and mechanical properties of 2A50 al loy under different extrusion ratios were investigated. The results showed that the grain of the alloy was refined, microstructure in longitudinal direction was elongated, the casting defects were eliminated and the mechanical properties we re ascended with increase in extrusion ratio.  
        关键词：Aluminum Alloy;Extrusion;Deformation Degree   
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        发布时间：2023-12-18
      • Hu Xinping Wu Bingyao
        Issue 4, Pages: 41-43(2003)
        摘要：The way of raising service life for die casting die in China was analyzed from the aspects of tool steel 3Cr2W8V, 4C r5MoSiV1（H13） and heat treatment technologies. The service life of die casting d ie can be significantly raised by the use of electroslag remelting cast steel, r ational pre treatment , heat treatment, and stress relief tempering, die surfac e strengthening and soldering resistance treatment. The developing tendency of p rolonging service life of the die was predicted.  
        关键词：Cr2W8V;4Cr5MoSiV1;Heat Treatment;Die Casting Die;Serv ice Life   
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        发布时间：2023-12-18
      • Zhao Hengyi
        Issue 4, Pages: 44-45(2003)
        摘要：A new testing method was developed for continuous measurement of gas gap pressure during mold filling process. The results showed that the pressure in gas gap increased gradually while gas gap s ize and mold filling speed descended with the increase in the pouring time. Some factors, including pouring temperature, pattern density, vacuum degree in parti cular affected gas gap pressure.  
        关键词：Expendable Pattern Casting;Gas Gap Pressure;Mold Filling   
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        发布时间：2023-12-18
      • Yuan Ziz hou Zhang Jinsong Chen Xiujuan
        Issue 4, Pages: 46-47(2003)
        摘要：Expendable polystyrene pattern（EPC） was used for mold s hell making in EPC by means of shell making technology similar to wax pat tern ininvestment casting to reduce carburization and hydrogen pick up in EPC so a result of polystyrene vaporization during pouring. Polystyrene pattern was lost with heating up to 600 ℃ for 60 min holding , and shell was baked at 800 ℃ for 1 h.  
        关键词：Lost Foam Pattern;Investment Casting;Polystyrene;Sodiu m Silicate   
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        发布时间：2023-12-18
      • Lü Zh igang Jiang Buju Yan Shuangjing Cui Xulong
        Issue 4, Pages: 48-49(2003)
        摘要：The air flow rate and humidity are important factors in fluencing quality and velocity of shell drying. The effects of the air flow rate and humidity on water vaporization velocity of colloidal silicate were measured experimentally.It is pointed out that the fans should be rationally arranged in mold shell drying chamber to warrant sufficient and uniform air flow.It is pref erable to use chain converge,if any.  
        关键词：Investment Casting;Drying;Air Flow;Humidity   
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        发布时间：2023-12-18
      • Xu Yunxiang
        Issue 4, Pages: 50-54(2003)
        摘要：The important factors to ensure mold filling involved f ollowing events: rational pouring velocity and static head, permeability of mold shell, melt and mold shell temperatures during pouring, avoidence of gas releas e obstruction from mold shell during pouring, and of discontinuous pouring,quara ntee of steady filling. Shri nkage hole transfer and dispersion were two effective methods to avoid shrinkage hole（porosity） in casting. According to different casting structure, either met hod can be selected.  
        关键词：Pouring Scheme;Alloy Filling;Casting Feeding;Investment Ca sting   
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        发布时间：2023-12-18
      • Liu Yuemei Xiao Enkui
        Issue 4, Pages: 55-56(2003)
        摘要：The difficulties in Euro materials production in main f requency channel electric furnace with acidic lining were analyzed.It is found that the difficulties were overcome in channel introduction furnace with neutral lining.  
          
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        发布时间：2023-12-18
      • Lei Jian Huang Yongcheng Zheng YuxinWang Zezhong Yuan Xudi Wang Jianshe
        Issue 4, Pages: 57-58(2003)
        摘要：The preparation technology for spectrum samples of a ne w Al base bearing alloy with high property was determined. Meanwhile, the imitat in g curves of relationship between luminous intensity values and gauged compositio n of various elements were established and applied to instruct the development a nd production of the bearing alloy with high properties.  
        关键词：Bearing Alloy;Spectrum Samples;Spectrum Sample Curve   
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        发布时间：2023-12-18
      • Vol. 0, Issue 4, Pages: 59(2003)
          
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      • Vol. 0, Issue 4, Pages: 60-61(2003)
          
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      • Vol. 0, Issue 4, Pages: 62-63(2003)
          
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      • Vol. 0, Issue 4, Pages: 65-66(2003)
          
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