最新刊期
      卷 ， 期 9 ， 2005
      • Fu Gaosheng Chen Wenzhe Qian Kuangwu
        Issue 9, Pages: 513-516(2005)
        摘要：Effects of melt-treatment and hot deformation on the behavior of elevated flow stress of Al sheets for pressure can （or called Al piece） during plastic deformation were investigated by hot-simulation testing method.The results show that Al pieces prepared by different melt-treatment all possess the remarkable characteristics of steady flow stress.The flow curves show stress peak with the strain rate of 10 s-1,meaning the occurrence of the dynamic recrystallization.A hyperbolic sine relationship is found to correlate well the flow stress with the strain rate,and an Arrhenius relationship with the temperature.For the high-efficient melt-treatment Al pieces,the values of true stress and true strain in the steady deformation are less than that of no-or conventional melt-treatment Al pieces,and its hot deformation activitation energy is remarkably decreased.In addition,the flow stress equation at elevated temperature of the Al pieces was derived also.  
        关键词：Al Sheet for Pressure Can;Melt-treatment;Plastic Deformation at Elevated Temperature;Behavior of Flow Stress   
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        发布时间：2023-12-18
      • Zhang Yuhui~1 Gao Deming~
        Issue 9, Pages: 517-519(2005)
        摘要：The relation between the mechanical properties and chemical compositions of self-developed Mg-Al-Zn-Mn series Mg alloy suitable for gravity casting was investigated to have determined the optimized composition Mg-9Al-0.8Zn-0.3Mn alloy.The mechanical properties of the T6 heat treated Mg alloy at ambient temperature are as follows: tensile strength σb=270 MPa,yield strength σ0.2=162 MPa and elongation δ=3.88%.The changes of mechanical properties and microstructural characteristics of the Mg alloy after T6 heat treatment were compared with those of untreated ones.  
        关键词：Magnesium Alloy;Metal Mould;Gravity Casting;Mechanical Properties   
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        发布时间：2023-12-18
      • Zhang Wei~
        Issue 9, Pages: 519-521(2005)
        摘要：The microstructure and composition of the diffusion layer in the hot dip aluminized steel after diffusion at 850 ℃ for 4 hours were investigated by means of transmission electron microscope （TEM）,scanning electron microscopy （SEM） and energy dispersive spectroscopy （EDS）. It was revealed that there are amounts of Fe-Al amorphous alloy phase and nano-grains at a distance from diffusion layer surface 30 μm.The content of amorphous grain in outer surface is very high,gradually reduced towards matrix layer.The microstructure observation form surface layer of hot dip aluminized steel indicates that the Fe-Al amorphous alloy phase was formed during cooling process after hot dip aluminization,which resulted from the eutectic reaction and interface diffusion.  
          
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        发布时间：2023-12-18
      • Liu Zhongxia Song Mousheng Li Jiwen Weng Yonggang Wang Mingxing Song Tianfu
        Issue 9, Pages: 522-525(2005)
        摘要：The effects of Ti alloying method and Ti content on the low cycle fatigue behaviors of A356 alloy were investigated.The results show that cycle-hardening behavior of A356 alloy was susceptive to both the Ti alloying method and Ti content,in which the alloy with （0.14%） Ti always has higher cyclic hardening rate than that of the alloys with 0.1% Ti.Both A356 alloy alloyed by electrolysis （EA356 alloys） and by melting Al-10Ti master alloys （MA356 alloys） exhibit the similar cyclic hardening behavior when tested at low strain amplitude,while tested at high strain amplitude,the EA356 alloys show the quasi-stable state that cyclic hardening ability approaches to saturation,and for the MA356 alloys,the cyclic hardening continuously proceeds.The low-cycle fatigue life of the alloy is only sensitive to the Ti content.Whether alloyed by electrolytic low-Ti alloys or Al-Ti master alloy,the alloy with 0.1% Ti always has higher low-cycle fatigue life than that of the alloy with 0.14% Ti.The EA356 alloys have the similar low-cycle fatigue life as the MA 356 alloys if two kinds of alloys have the same Ti content.  
        关键词：A356 Alloy;Low-cycle Fatigue Behavior;Cyclic Hardening;Fatigue Life   
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        发布时间：2023-12-18
      • Chen Huimin Zhou Xiaoping Pan Yongqing Zhou Xizhi
        Issue 9, Pages: 526-527(2005)
        摘要：The microstructure and properties of ternary boride based cermet coating on the surface of H13 steel by vacuum powder sintering were investigated.Approaches to the effects of sintering process in coating microstructure were performed,and the interface formation characteristics and hardness distribution in coating layer were analyzed.It was found that ternary boride （Mo2FeB2） based cermet coating with 1～3 mm thickness can be prepared by reaction sintering at 1 220～1 250 ℃.The hardness can reach up to 1200HV due to tight bond between coating and steel matrix by inter-diffusion of Fe,B,Cr,Ni V,and Mo,which is helpful to improving the wear resistance of the H13 steel.  
          
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        发布时间：2023-12-18
      • Shi Hongjun Yang Yitao Zhang Henghua Shao Guangjie
        Issue 9, Pages: 528-530(2005)
        摘要：Heat transfer coefficient of cooling water hα was calculated by experimental temperature field combining with simulated ones,in which estimated results of heat transfer coefficient of cooling water based on one-dimensional approximate difference method were employed by linear interpolation method.The results showed that heat transfer coefficient is increased with the augment of watering quantity,and earlier increased and then reduced with increase of surface temperature.The heat transfer coefficient hα is equal to （0.52（3 759.61+）24.39T-0.059T2）W-0.94 under conditions of surface temperature of 50～550 ℃ and the cooling water of 2.0～3.8 m3/h.  
        关键词：Continuous Casting;Aluminum Alloy;Heat Transfer Coefficient;Boiling Heat Transfer;Heat Flux   
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        发布时间：2023-12-18
      • Wang Yingchun~1 Zhu Liguang~2 Li Dayong~1 Peng Yinghong~1
        Issue 9, Pages: 531-533(2005)
        摘要：Based on the principle of heat transfer,solidification theory and slag-smelting,a finite differential model was developed to analyze the heat and solidification and to control process of continuous casting,considering the relationship between thermo-physical parameters of steel with temperature.The rational temerature and secondary water quantity distribution can be realized by optimizing the secondary water based on continuous casting principle and objective control method,obtaining the optimum billet quality,and aiming at the solidification characteristics of different steel series,the design of mold flux was conducted.The calculated value is well in agreement with the measured ones.It was researched to the effects of some parameters,including pouring temperature,drawing velocity,secondary water quantity,on the surface temperature of billet,liquid-core length and solidified shell thickness as well as effects of pouring technology on properties of mold flux.  
        关键词：Heat Transfer;Objective Temperature Control;Numerical Simulation;Properties of Mold Flux;Continuous Casting   
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        发布时间：2023-12-18
      • Shuai Gewang Zhang Meng
        Issue 9, Pages: 534-537(2005)
        摘要：The progress in high-strength and high-conductivity copper alloy and copper base composites were surveyed.The strengthening mechanism,preparation technology and microstructure and properties of the alloy were introduced.It was pointed out that conventional precipitated strengthening copper alloy possesses higher strength and conductivity and simple preparation technology suitable for manufacturing various electric connecting component,focusing on the comprehensive utilization of strengthening mechanisms and multi-element alloy in future to improve properties and lower cost.Although dispersed strengthening copper has remarkable advantages in elevated application,there exists the problem of complicated technology and un-stable properties.The deformation-processed copper-based composites with high performance can meet the requirements but it is necessary to simplify the process.  
        关键词：High-strength and High-conductivity Copper Alloy;Dispersed Strengthening Copper;Deformation-processed Copper-based Composites   
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        发布时间：2023-12-18
      • Mao Weimin Zhen Zisheng Chen Hongtao
        Issue 9, Pages: 538-540(2005)
        摘要：With the help of a self-developed electromagnetic stirring device and alloy melt quenching technology,the effects of stirring parameters on the microstructure of AZ91D Mg alloy during continuously cooling process were investigated at the condition of the electromagnetic frequency of 50Hz.The results reveal that the spheroidal primary α-Mg phase in the semi-solid AZ91D slurry or billet is continuously increased with the stirring frequency increase,and become more round and more homogeneous distribution when the electromagnetic frequency is lower than 50 Hz.The desirable microstructure in semi-solid Mg slurry or billets can be prepared with the electromagnetic frequency up to or over 50 Hz.With the increase of the electromagnetic stirring power,the rosette-like primary α-Mg phase in the semi-solid alloy melt can be intensely subjected to the man-made temperature fluctuation to result in the root remelting effects of the dendritic arm,which forms more and more spheroidal primary α-Mg phase,and the phase become more and more round.Low cooling rate can be beneficial to forming desirable semi-solid microstructure of the Mg alloy by electromagnetic stirring method.  
        关键词：AZ91D Mg Alloy;Semi-solid;Electromagnetic Stirring;Microstructure   
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        发布时间：2023-12-18
      • Du Yunhui Zhang Peng Liu Hanwu
        Issue 9, Pages: 541-543(2005)
        摘要：In order to develop a high temperature steel-backed bearing materials,the steel-QTi3.5-3.5 graphite bonding plate was prepared by semi-solid pressing bonding method.The relationship between mechanical properties of bonding plate interface and solid fraction of QTi3.5-3.5 graphite slurry can be derived by examining the pressure bonding behavior between steel plate and QTi3.5-3.5 graphite slurry,having determined the structure constituent of the bonding interface.The results show that under the conditions of preheated temperature at 620 ℃ for steel plat,and preheated temperature at 530 ℃ for the die,pressure at 50 MPa and holding pressure time for 2 min,when the solid fraction of QTi3.5-3.5 graphite slurry is lower than （45.8%,）the shearing strength of bonding plat interface increase with solid fraction increase while decrease with solid fraction increase when the solid fraction is higher 45.8%.When the solid fraction is 45.8%,the highest shearing strength of bonding plate can be obtained,correspondingly,there no bonding defects in the interface,forming the metallurgical bonding structure composed of Fe-Cu inter-diffusion zone.  
        关键词：Semi-solid Pressure Bonding;Solid Fraction;Mechanical Properties   
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        发布时间：2023-12-18
      • Lu Ruhui Zi Bingtao Sun Fuliang Zhang Zhenglai
        Issue 9, Pages: 544-545(2005)
        摘要：Experiences of design of die casting die for Mg alloy gear box and its die casting method were summarized.The die casting die uses four slide blocks and drawing-core mechanism in three direction,adopting ring structure for main ingate,setting additional ingate inside and smoothly part-separated structure in connection of cavity.Complicated working machine was used to ensure IT6 grade precision for die manufacturing.Rational die casting technology was employed to manufacture Mg alloy gear box including injected pressure for 10～16 MPa,applied specific pressure for 40～70 MPa,filling velocity at 40～60 m/s,die temperature at 220～280 ℃,pouring temperature at 640～690 ℃,filling time for 0.01～0.25,sand holding pressure time for 3～6 s.The practical verification indicated that good die structure and rational die casting method can be helpful to ensure good formation and few defects in die castings,extending the service life of the die.  
        关键词：Mg Alloy;Gear Box;Die Design;Die Casting   
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        发布时间：2023-12-18
      • Liu Hongbo Yang Bo Zhang Hu
        Issue 9, Pages: 546-549(2005)
        摘要：Effects of lift velocity,structure size of lift tube on the flow morphology of mold filling were investigated by hydraulic simulation.It was found that a larger interior diameter （D1） is beneficial to rapidly and smoothly filling mold with a given working section （S4） of lift tube.S1/S2 （ratio of interior section and out-section） should be lower than 1.6,and S4/S2 ratio has the more significant effect on the flow morphology than the lift tube structure when D1 （interior diameter） is lower than 50 mm.S1/S2 should be lower than 3,and the lift tube structure has the more remarkable effect on the flow morphology when D1 is more than 50 mm,so the proper conic ingate can be used to optimize the lift tube structure but S4/S2 should be lower than 25.  
        关键词：Low Pressure Casting;Lift Tube;Hydraulic Simulation;Flow Morphology   
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        发布时间：2023-12-18
      • Tang Heyong Tong Jianxin Li Derong Cui Wei
        Issue 9, Pages: 549-550(2005)
        摘要：Comprehensive analysis of structure of air-conditioner compressor housing and feasibility in low pressure casting were conducted.A series of countermeasures for the housing in low pressure casting were introduced,and proper processing parameters for the manufacturing were given.Batches of sound castings were successfully manufactured.  
        关键词：Low Pressure Casting;Air-conditioner Compressor;Aluminum Alloy Housing   
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        发布时间：2023-12-18
      • Vol. 0, Issue 9, Pages: 551(2005)
          
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      • Chen Bing
        Issue 9, Pages: 552-554(2005)
        摘要：High hydraulic pressure cleaning sand has been used widely at abroad,which has the features of good cleaning effects and high first-cost.To realize a good cleaning effects,it is ensured to the pattern-assemble holding device with rational structure,higher hydraulic pressure and relative coordinately moving between pattern-assemble and hydraulic device.Some new chemical cleaner and treatment technology for slag-mud and waste-water have been developed for chemical cleaning at abroad.  
        关键词：High Hydraulic Pressure Cleaning Sand;Casting Cleaning;Chemical Cleaning;Waste-water Treatment   
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        发布时间：2023-12-18
      • Liu Xianfu~1 Li Yanping~2
        Issue 9, Pages: 555-557(2005)
        摘要：Stainless steel blade of turbine engine with 950mm length and 42 kg weight was manufactured by adopting D-COAT rapidly dried sol silicate instead of sol silicate-ethyl silicate to make compound shell.The rapidly dried mechanism of the D COAT sol silicate and the factors influencing shell mold properties were investigated.The layer-drying time only need 1～2 h under the condition of 30%～40% humidity and 6～8 m/s wind speed due to use soluble high polymeric substance reinforcement in D COAT sol silicate.The D COAT sol silicate has the features of low residual strength and high green strength in shell mold and high temperature strength as well as good permeability,successfully applied for the production of large blade of turbine engine.  
        关键词：Rapidly Dried Sol Silicate;Binder;Shell Mold for Investment Casting;Ethyl Silicate   
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        发布时间：2023-12-18
      • Ye Shengping Wu Zhichao
        Issue 9, Pages: 557-559(2005)
        摘要：The lost foam casting has stridden development in China at decade.Over tens of enterprises are devoted in researching and spreading on lost foam casting.There are sound matching in lost foam casting from equipment supplier to mould manufacturer and material supplier.The lost foam casting was successfully used to produce automobile housing,pipe joint/ valve and special alloy parts,having formed the Chinese character.  
        关键词：Lost Foam Casting;Survey;Foundry Enterprise   
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        发布时间：2023-12-18
      • Yuan Zizhou~1 Kuang Yi~1 Mo Shixiong~2
        Issue 9, Pages: 560-561(2005)
        摘要：ZG20SiMn steel impeller of pump in lost foam casting was introduced.It was pointed out that the lost foam casting is very suitable for thin-walled complicated pump impeller.  
        关键词：Pump Impeller;LFC;Technique   
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        发布时间：2023-12-18
      • Lei Pengfei Hu Rui Wang Yichuan Kou Hongchao Yin Yunfei Li Jinshan Fu Hengzhi
        Issue 9, Pages: 562-564(2005)
        摘要：We have developed a high gradient unidirectional solidification horizontal continuous casting apparatus to investigate the preparation process of Cu-Cr in-situ composites.It was revealed that inter-matching among parameters,including glory-hole temperature,cooling intensity and drawn velocity,has the significant effects not only on the control of liquid-solid zone but also on the surface quality and internal unidirectional structure of the Cu-Cr bar.With the drawn velocity keeping 245 μm/s,the microstructure is composed of eutectic （α+β） phase and primary α phase,in which the eutectic （α+β） phase is parallel to primary α phase,uniformly arranged along axial direction with the continuous fibres,while primary α phase exhibits cellular character at a low drawn velocity,restrained by thermal flow in growth direction.  
        关键词：Unidirectional Solidification;Horizontal Continuous Casting;Cu-Cr In-situ Composites;Microstructure   
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        发布时间：2023-12-18
      • Wang Xuezheng~1 Zhao Ming~2 Han Ziqiang~1 Xue Weijing~1 Fang Jianqiang~1
        Issue 9, Pages: 565-566(2005)
        摘要：The Al2O3f/ZL109 short fibre reinforced cylinder composites was prepared by extrusive technology.Under the conditions of rotating velocity at 675 r/min and loading at 100 N,wear-experiments of four sets of composites specimens with horizontal fibre orientation and vertical fibre orientation respectively were conducted.The curves of effects of fibre orientation on volumetric fraction and wear-resistance of the composites were mapped based on the experimental results.The results show that the composites with vertical fibre arrangement has the higher wear-resistance than that of the composites with horizontal fibre arrangement.  
        关键词：Piston;Al2O3f/ZL109;Composites;Fibre Orientation;Wear-resistance   
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        发布时间：2023-12-18
      • Wang Zhengbao Liu Jing Yuan Zexi
        Issue 9, Pages: 567-569(2005)
        摘要：The effects of 0.4% Sb on the microstructure and mechanical properties of Mg alloy and the strengthening mechanism of Sb were investigated by means of SEM and XRD.It was revealed that tensile strength of AZ91D Mg with 0.4%Sb alloy can be increased by 20MPa due to refining structure of AZ91D Mg alloy,improving the morphology and distribution of the Mg17Al12 phase and forming a new enhancing Mg3Sb2 phase.The tensile strength of ignition-proof Mg alloy with 0.4% Sb can be increased by 64 MPa due to the decrease of bar-like Al11RE3 phase and the formation of particle CeSb phase.  
        关键词：Sb;Mg Alloy;Microstructure;Mechanical Properties   
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        发布时间：2023-12-18
      • Xia Lu~1 Mao Shaohong~2 Chen Hong~1 Li Yao~3
        Issue 9, Pages: 569-571(2005)
        摘要：The microstructure and mechanical properties of the 7475 aluminum alloy with 0.023% Be addition heat treated by recrystalization annealing and ageing hardening were researched.The results showed that 0.023% Be addition can refine the grain and improve the comprehensive mechanical properties and recrystallization temperature,and extend recrystallization inoculation period and decrease recrystallization rate,meanwhile,promote the ageing hardening process of the alloy.  
        关键词：7475 Al Alloy;Be;Recrystallization;Ageing-hardening;Structure;Mechanical Properties   
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        发布时间：2023-12-18
      • Su Juanhua~
        Issue 9, Pages: 572-574(2005)
        摘要：Effects of ageing temperature,ageing time on microstructure,micro-hardness and electric conductivity of rapidly solidified Cu-Cr-Sn-Zn alloy were investigated.The micro-hardness and electric conductivity of the alloy are 100 HV and 20.9 MS/s,respectively,due to strengthening effects of fine grain.Aged at 500 ℃ for 15 min,the micro-hardness and electric conductivity are 170 HV and （37.1 MS/m,）respectively,resulted from the precipitated dispersive and intensive Cr phase improving the strength and conductivity of the rapidly solidified alloy.  
        关键词：Cu-Cr-Sn-Zn Alloy;Micro-Hardness;Conductivity;Rapid Solidification   
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        发布时间：2023-12-18
      • Guo Ming’en~1 Liu Rui~2 Sun Zuli~1
        Issue 9, Pages: 575-576(2005)
        摘要：There are shrinkage porosity and crack in strip billet,which are the main reasons resulting in rejected castings during mill machining.Through the orthogonal testing for the relevant technological parameters in horizontal continuous casting,the mapping model of artificial neural network have been established using the data from the experiments.The optimization of the processing parameter matching was conducted to improve the billet quality and production yield with the help of the model combining with GA （genetic algorithm）.  
        关键词：H68 Alloy;Horizontal Continuous Casting;">   
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      • Vol. 0, Issue 9, Pages: 577(2005)
          
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      • Vol. 0, Issue 9, Pages: 578(2005)
          
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