最新刊期
卷 32 ， 期 10 ， 2012
- 摘要：A high temperature test rig for corrosion-wear in molten metal has been developed to investigate the corrosion-wear mechanism in molten metal.The key technological parameters include rotating main axis speed of 0150 r/min and loading in range of 0200 N,measuring frictional force in range of 0100 N,testing temperature at 251 000 ℃ as well as temperature-control precision at ±1 ℃.Corrosion-wear behavior of H13 steel in liquid aluminum was measured with the rig.The results indicate that the rig can simulate the interaction behavior of corrosion-wear of the material in molten metal accurately,and can carry out the data acquisition of friction stably.关键词：Molten Metal;Corrosion-Wear;Test Rig
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发布时间：2024-04-01 - 摘要：Three ladder Mg-Mn sacrificial anodes with different chemical compositions were poured by permanent mold.The corrosion behavior was investigated by galvanostatic corrosion test in saturated calcium sulfate-magnesium hydroxide solution.The results indicate that:the impurity elements are severe due to the solute segregation,and the grain sizes distributed heterogeneously result in the un-evern current efficiency at different distance to the surface of the metal mold.The impurity elements are formed into the intermetallic phases locally distributed at the grain boundaries,resulting in the intergranular corrosion of magnesium sacrificial anode.Furthermore,with the increase of heterogeneous degree of secondary phase size,the mechanical spalling at un-corrosion position is promoted,resulting in the increase of weight loss of the anode and decreasing the electric current efficiency.The corrosion morphology observation reveals that the more localized strip-shaped etch pits are formed on the surface of the magnesium anode with more serious mechanically spalling and heterogeneous corrosion,resulting in the lowest current efficiency of 41%.With the decrease of diameter of corrosion hole on surface of magnesium anode and the increase of distribution uniformity,the current efficiency is improved increasingly.关键词：Metal Mold Casting;High Open-Potential;Mg-Mn Sacrificial Anode;Silicon Content;Pitting Corrosion
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发布时间：2024-04-01 - 摘要：<正>在工信部公布的《工业节能"十二五"规划》当中,铸造等9大工业行业被列为进行重点节能行业。这9大重点推进工程将带动6000亿元的投资,节能减排也将成为"十二五"期间铸造行业发展
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发布时间：2024-04-01 - 摘要：<正>在2012中国（铜陵）青铜文化论坛上,由北京大学考古文博学院陈建立所做的专题报告《铜陵师姑墩遗址出土铸铜遗物的初步研究》显示,该遗址冶炼与铸造活动共存,年代相当于二里头文化三四期开始,据此,铜陵
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发布时间：2024-04-01 - 摘要：<正>2012年7月,运城市稷山县年产10万吨铸造件项目开工奠基。稷山县委、县政府大力实施"工业强市"战略,紧紧抓住晋陕豫黄河金三角承接产业转移示范区这一历史机遇,加大招商引资力度,
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发布时间：2024-04-01 - 摘要：<正>鼠标轻轻一点,就能迅速便捷地从E-learning（网络学习）中找到自己想要选学的知识。8月21日,东风汽车股份铸造分公司工会干事胡超按照人事部门提供的学习账户,通过东风汽车股份网络学院的网络在线平台,轻松地完成了他个人自进入网络课堂以来的第八个学时学习。和胡超一样,该公司其他的管理技术人员也
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发布时间：2024-04-01 - 摘要：<正>日前,一汽铸造有限公司铸造一厂新厂正式在长春市汽车产业开发区开工兴建,这个举动极大鼓舞了还在为低迷的商用汽车奋战的人。据了解,一汽集团为实现"十二五"规划目标,更好更快地发展自主品牌,计划将为铸造一厂注资
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发布时间：2024-04-01 - 摘要：<正>最近,从冀州市获悉,圣春公司投资1.8亿元建设的年产1500万片铸铁散热器铸造项目,能源消耗减少一半,污染排放大大降低;正在建设的优尼克高端铸件生产基地项目采用最新开发的控制系统与先进加工技术,16条迪砂线全部采用国际
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发布时间：2024-04-01 - 摘要：In order to understand the asymmetry of extruded AZ31B magnesium alloy between dynamic tension and compression,texture analysis was performed,and dynamic compression and tension tests at extruded direction and transverse direction were carried out using a split Hopkinson pressure bar and a reflected hopkinson tension bar apparatus with average strain rates in the range of 5002 650 s-1.The results show that due to the formation of basal plane texture during the extruding process,extension twins {1012}<1120> are activated easily when the alloy is compressed along extruding direction,so yield stress is lower and insensitive to strain rates.When the alloy is tensioned along extruding direction,due to the tensile twins not be activated,contract twins {1011}<1120> and non-basal slips are the main deformation mechanisms,leading to the higher yield stress of the alloy.The alloy shows a strong asymmetry between compression and tension,and the ratio of yield stress between compression and tension is about 0.30.Absence of asymmetry along transverse direction can be observed.关键词：Magnesium Alloy;Twining;High Strain Rate;Hopkinson Apparatus
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发布时间：2024-04-01 - 摘要：Complex thin-walled aluminum alloy bottom-base was produced by adjusted pressure casting and by vacuum suction casting,respectively.The castings formation and alloy melting were analyzed comparatively.The results reveal that the complex thin-walled aluminum alloy bottom-base can be produced successfully with filling velocity of 60 mm/s and pouring at 720 ℃ by resin sand mold combining with adjusted pressure casting关键词：Adjusted Pressure Casting;Vacuum Suction Casting;Counter-gravity Casting;Complex Thin-Walled Casting
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发布时间：2024-04-01 - 摘要：Effects of different aging treatments on mechanical properties of the 6061 wrought aluminum alloy wheels were investigated.The results show that tensile strength,yield strength,hardness of the alloy wheel are increasedslightly,while elongation is decreased slightly with the increase of the aging time.Meanwhile,changes are decreased,and microstructure and properties tends to be stable.Microstructure observation shows that the morphology of eutectic Si in the alloy wheel is related with the aging time.关键词：6061Aluminum Alloy;Wheels;Aging;Mechanical Properties
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发布时间：2024-04-01 - 摘要：Intersection grid easily appeared on the casting contact surfaces during grid meshment process of the complex sand-mould casting by using the preprocess module of ProCAST,which brought many difficulties to the numerical simulation.The interface mode between the Pro/E and ProCAST was analyzed,and several methods of grid generation were compared.The results show that intersection grid on the contact surface can be well avoided by using the grid assembly technology.The grid assembly technology not only ensures the grid quality,but also reduces the difficulty of meshment and improves the work efficiency.The feasibility of the technology is validated by an application example of sand-mould casting.关键词：ProCAST;Pro/E;Interface Mode;Grid Assembly;Sand-Mould Casting
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发布时间：2024-04-01 - 摘要：A three dimensional cellular automaton-finite element model was developed to predict the solidification grain structures in γ-TiAl alloy ingots during vacuum arc remelting process,in which Gaussian distribution continuous nucleation model was adopted to describe the nucleation and the KGT model was extended to multi-component alloys to account for the growth kinetics of the dendrite tip.Effects of melting rate,heat transfer coefficient and nucleation parameters on the solidified microstructure evolution were investigated.The results reveal that with increasing in the melting rate or increasing in the maximum volume nucleation density,the formation of equiaxed grains is promoted,and the growth of columnar grains is restrained.Larger mean undercooling and larger heat transfer coefficient can increase grains size and number of columnar grain.The effects of variation of standard deviation on grain structure of the ingot can be ignored.关键词：CAF;γ-TiAl Alloy Ingot;VAR;Grain Structure
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发布时间：2024-04-01 - 摘要：Finite differential method was used to simulate the formation of power steering pump shell.Based on the simulated results,origination of the defects,such as entrapment-gas,shrinkage and so on,was analyzed,and countermeasures were presented to reduce mould-trial and mould-repair in practical production and to decrease the reject rate.The simulated results show that there exist serious entrapment-gas,shrinkage porosity（hole） in the castings,which is attributed to the complex structure of the castings with un-even wall-thickness.So the design of gating system,exhaustion of the mould and sequential solidification of the castings in process of casting should be paid attention to.关键词：Finite Differential Method;Simulation Analysis;Steering Pump Shell;Defects
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发布时间：2024-04-01 - 摘要：The Mg-9Gd-1Y-0.5Zr(GW91) alloy piston was produced by squeezing casting.The mechanical properties of the samples cut from piston top and skirt at the peak-aged condition(T6) and its creep resistance at 200~300 ℃ were investigated.The results reveal that precipitates in grain is uniformly distributed in the T6 treated piston,and the grain size in piston top and skirt treated by T6 reaches 140 μm and 80μm,respectively.Meanwhile,the tensile strength of piston is decreased with increasing in temperature,and the ultimate tensile strength(UTS) of piston top and skirt are 210 MPa and 223 MPa,respectively,at 300 ℃.The steady-stage creep rate of piston is increased with increasing in temperature and applied stress.The steady-stage creep rate of piston top and skirt are 7.81×10-8 s-1 and 1.45×10-7 s-1,and total creep strain after 100 h are 2.8% and 3.0%,respectively,at 300 ℃ and 50 MPa,evidently superior to those of commercial Al-Si alloy.关键词：Mg-9Gd-1Y-0.5Zr Alloy;Piston;Mechanical Properties;Creep Resistance
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发布时间：2024-04-01 - 摘要：An Al-alloy gear box for Dci11 engine was designed and developed by using the CAE software.The design was optimized by structural CAE software.The Dci11 engine was produced successfully.关键词：Complex Al-alloy Die Castings;Gear Box;CAE
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发布时间：2024-04-01 - 摘要：Filling and solidification of ZG16Mn brake bottom plate for automobile were simulated by numerical simulation.Influences of pouring temperature,squeezing speed and squeezing pressure on the filling completeness were visualized.The results show that the completeness of filling is mainly controlled by pouring temperature.Pouring temperature can be slightly reduced by increasing squeezing speed and squeezing pressure.The over-fast solidification of liquid metal in ingate is responsible for imperfect filling.Because liquid metal can not enter the die cavity,the phenomenon of misrun appears.To be ensured casting with completely filling,ingate must be unobstructed.Ingate can not be obstructed by controlling the pouring temperature.The experimental results are well in agreement with the simulated ones.关键词：Brake Bottom Plate;Squeeze Casting;Filling;Numerical Simulation
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发布时间：2024-04-01 - 摘要：It was found that the entire cast solidification started in a short time after being filled based on the numerical simulation under the conditions of low pressure casting.The difference of the solidification in solidification came from the solid content in different position varied with the cooling condition.The formation of the shrinkage was attributed to cooling curve in the feeding zone partly coincidences with that in needed feeding zone.The insulation layer was designed to set on the positions corresponding to the wheel rib in the upper core and bottom core,which made position of the cooling curve at the spoke increase,realizing cooling curves separation between the spoke and conjunction location of the rib and elimination of the shrinkage porosity（holes） at the conjunction.The temperature in the area of mold being covered by the insulation boards was raised by approximately 20 ℃.关键词：Low Pressure Casting;A356 Alloy Wheel;Numerical Simulation;Heat Insulation
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发布时间：2024-04-01 - 摘要：<正>主办单位:中国铸造协会承办单位:中国铸造协会铸钢工作委员会、中国二重（德阳）重型装备股份有限公司、东方电气德阳东汽铸造有限公司会议时间:2012年11月4日～11月7日会议地点:成都沃特酒店（四星）成都太升南路53～57号会议内容:（1）优质铸钢件研讨;（2）专家答疑;（3）中
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发布时间：2024-04-01 - 摘要：The whole structure of the flange tee is composed of flange and thin-walled tube,so severe unevern wall-thickness can be observed at the castings.Severe deformation appears in the castings during pouring process.Through designing split type gating system,the deformation defects are eliminated effectively.关键词：Thin-Walled Investment Castings;Spit Type Gating System;Deformation Rate
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发布时间：2024-04-01 - 摘要：The relationship between the thermal-physical parameters of TiB2/A356 aluminum matrix composite and the volume fraction of TiB2 was investigated.Based on the secondary development of ProCAST software,the relationship between temperature change and thermal-physical parameters of TiB2/A356Al aluminum matrix composite with varied volumetric fraction of TiB2 was presented.A investment casting aeronautical part was simulated and produced.The results reveal that through increasing the pouring temperature and velocity of alloy melt as well as adding insulation materials around the shell mold,shrinkage porosity and shrinkage hole in the surface of the parts can be eliminated effectively.关键词：Numerical Simulation;Aluminum Matrix Composite;Investment Casting;Casting Defect
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发布时间：2024-04-01 - 摘要：Partial shell quenching process and its key points were described.Many practical products show that through adopting partial shell quenching process,shrinkage porosity（hole） and un-sound microstructure resulting from hot spot and partial over-thick shell can be eliminated by realizing uniform temperature distribution and sequential solidification,exhibiting chilling effect.Thickness of the flange to wall-thickness of valve body or wall-thickness of flow channel is less than or equal to 3 when the partial shell quenching is applied for flange valve body and valve cover.关键词：Investment Casting;Partial Shell Quenching;Isolated Hot Spot;Chilling Effect
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发布时间：2024-04-01 - 摘要：The optimum proportion of a water-based coating additives,in which modified starch as binder and sodium bentonite and powdered cellulose（CMC） as composite suspension agent,for EPC steel castings was presented through orthogonal experiments,and the optimized contents of sodium bentonite powder,CMC and modified starch reach 1.5%,1.5% and 1.2%,respectively.Production experiment was conducted.The results reveal that the coating developed with a lower cost exhibits desirable performance,overcoming the existing problems in the process and meeting practical requirements.关键词：Water-based Coating for EPC;Additives;Coating for Steel Casting
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发布时间：2024-04-01 - 摘要：Nano-sized SiC particles reinforced magnesium matrix composites（n-SiCp/AZ91D） were fabricated by mechanical stirring combining with high intensity ultrasonic dispersion processing.Influences of n-SiCp content and temperature on the friction and wear behavior of the composites prepared were investigated by a ball-on-disc testing.The results show that the resistant friction and wear behavior of the nano-composites is improved greatly with nano-SiC particle,and with the increase of n-SiCp content,it is gradually enhanced.Temperature plays important roles in controlling resistant friction and wear behavior of the nano-composites prepared.From room temperature to 300 ℃,both the AZ91D alloy and its composites undergo mild-to-severe wear regime change.The transition temperature of the nano-composites prepared from mild to sever wear is increased by 50 ℃,compared with that of AZ91D matrix.In addition the nano-composites exhibit better high-temperature resistant friction and wear bahvior.关键词：Friction and Wear Properties;Metal Matrix Composite;Magnesium Alloy;Nano-Particles
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发布时间：2024-04-01 - 摘要：High-volume fraction SiCp/Mg composites with different particle sizes were fabricated by vacuum-pressure infiltration technology,and the effects of SiC particle size on thermal expansion behavior of SiCp/Mg composites were examined.The results indicate that the particle size has the significant effect on the coefficient of thermal expansion（CTE）,and at the same volume fraction conditions,the CTE of the composites is decreased with the decrease of the particle size.In addition,the CTE of the composites with different volume fraction is inversely proportional to the interfacial area of the composites.CTE of the composites can be effectively decreased by decreasing the particle size and increasing the volume fraction of particle.The effect of particle size on thermal expansion behavior of the SiCp/Mg composites is attributed to acting on interfacial area,relative density of the composites as well as dislocation density of AZ91D alloy.关键词：SiCp/Mg Composites;Particle Size;High Volume Fraction;Thermal Expansion Behavior;Interfacial Area
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发布时间：2024-04-01 - 摘要：The primary technological characteristics of permanent mold coated sand casting ductile iron fly wheel and its process control were described.Meanwhile,the defects possible encountered in production and countermeasures were presented.关键词：Permanent Mold with Coated Sand;Ductile Iron;Fly Wheel
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发布时间：2024-04-01 - 摘要：5B01 alloy sheet was prepared by semi-continuous casting-rolling technology.Influences of stabilizing annealing on the mechanical properties,exfoliation corrosion resistance and texture of the cold rolling sheet were investigated.The results show that,with increasing in stabilizing annealing temperature,strength of the alloy is decreased and elongation is increased,however,exfoliation corrosion resistance of the alloy is increased firstly and then decreased.There are mainly Brass{011}(211),Copper{112}(111) and S{123}<634> texture in cold-rolled Al-Mg alloy sheets.With the annealing temperature increasing to 300 ℃,the deformed textures disappear gradually,and the brass and copper textures are evolved into cube{001}(100) and cube-rotation{001}(110) textures.关键词：5B01 Alloy;Heat Treatment;Mechanical Properties;Corrosion;Texture
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发布时间：2024-04-01 - 摘要：The undercooling ability of Sb and Sb-Bi alloys was measured by DSC,and the exotherm is increased with the increase of Sb content.Through the resistivity measurement,it is found that the resistivity of Sb and Sb-Bi alloys undergoes several sudden change,and the upturn of resistivity of Sb and Sb90Bi10 at undercooled state can be observed with the decrease of temperature.Meanwhile,the abrupt transformation of resistivity corresponds to the sudden change of temperature during the cooling process in Sb and Sb-Bi alloys.It is believed that the difference of exotherm is attributed to the difference of latent heat release ability,and the sudden change of resistivity with temperature is related to the peierls distortion in hexahedral structure of Sb and the change of atomic cluster size.In addition,the corresponding relation of temperature and resistivity indicates that the structure transition in solidification process has the obvious effect on the resistivity.关键词：Sb;Sb-Bi Alloy;DSC;Undercooled;Resisitivity;Peierls Distortion
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发布时间：2024-04-01 - 摘要：The hypereutectic Al-18Si,Al-20Si,Al-22Si（weight fraction） alloys were prepared by the controlled diffusion solidification（CDS）,and effects of different mixing ways and high silicon alloy overheating temperatures on the size,morphology and distribution of primary silicon in hypereutectic Al-Si alloys were investigated.The results show that effect of liquid-liquid mixing way is superior to liquid-solid mixing way in improving primary Si.With the increase of the overheating temperature,the size of primary silicon is decreased with round morphology and uniform distribution.At the same overheating temperature,with increasing in the content of silicon in the alloys,the size of primary silicon is increased with the slightly change of morphology.Especially,the microstructure of liquid Al-25Si alloy with 900 ℃ overheating mixing with liquid pure Al at 660 ℃ exhibits desirable,where the primary silicon size is only 34.3 μm,and the length-width ratio is 1.48.关键词：Hypereutectic Al-Si Alloy;Liquid-Liquid Mixing;Controlled Diffusion Solidification（CDS）;Primary Silicon;Overheating Temperature
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发布时间：2024-04-01 - 摘要：Influences of solution treatment on microstructure and mechanical properties of AZ31 magnesium alloy were investigated by Zeiss microscope and X-ray diffraction.The results show that the tensile strength of AZ31 magnesium alloy is increased from 69.7 MPa to 86.6 MPa with solid solution treatment at 688K from 6 h to 12 h.The β-Mg17Al12 phase in the microstructure of the AZ31 magnesium is gradually dissolved into the matrix phase after solid solution at 688 K for 12 h.With increasing in the solution time,the static recrystallization in the magnesium alloy can be fully undergone,and a large amount of fine recrystallization grains with the average size of 10 μm are generated at the boundary of the AZ31 magnesium alloy after the solid solution at 688 K for 12 h.关键词：AZ31 Magnesium Alloy;Solid Solution Treatment;Microstructure;Tensile Strength
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发布时间：2024-04-01 - 摘要：ZK60 exhibits a higher strength and good plasticity in commercial magnesium alloys.In order to further improve its performance,trace Y and Nd rare earth elements or Ag were added into ZK60 magnesium alloy,and then the alloy melt was treated by ultrasound to understand effect of ultrasonic treatment on solidification microstructures of ZK60 alloys with trace Y and Nd or Ag.The results show that refining effects of adding trace elements on the ZK60 alloy can be ignored,and coarse behavior in ZK60-1Y-1Nd and ZK60-1Y can be observed.Coarse grain in the ZK60-1Y-1Nd can be refined by ultrasonic treatment.There exists interaction of RE element and ultrasonic treatment on grain refinement.The minimum grain size can be observed in the ZK60 alloy with Y and Nd or Ag after ultrasonic treatment with 200 W.ZK60-0.2Nd alloy and ZK60-1Y-0.5Ag alloy have low sensitivity to thermal effect of ultrasonic treatment.关键词：ZK60-X Alloy;Alloying;Ultrasonic Treatment;Solidification Microstructures
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发布时间：2024-04-01 - 摘要：Microstructures and mechanical properties of ADC12 alloy with different Sm additions were investigated by optical microscopy（OM）,scanning electron microscopy（SEM）,energy dispersive spectrometry（EDS）.With the increase of the Sm in the range of 01.0%,the secondary dendrite arm spacing and the size of primary α-Al phase as well as the size of silicon phase are decreased,while the tensile strength and elongation are increased.With 1% Sm addition,the secondary dendrite arm spacing and the average size of primary α-Al cell are about 15 μm and 3040 μm,respectively,and most of the Si phases exhibit spherical structure or rod-like shape with high aspect ratio.The tensile strength and elongation reach 220 MPa and 3.1%,respectively,increased by 22% and 210%,respectively,compared with those of ADC12 alloy.However,with Sm addition more than 1%,the mechanical properties are decreased as a result of coarseness of the microstructures.关键词：Sm;ADC12 Alloy;Microstructure;Mechanical Properties;Refinement;Modification
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发布时间：2024-04-01 - 摘要：<正>据相关媒体报道,近期,美国议会提出,为保证本土汽车零部件的市场占有率,同时避免中国汽车零部件的显著冲击,要求对中国的汽车零部件采取严厉反制措施。据悉,由于中国汽车零部件的登
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发布时间：2024-04-01 - 摘要：<正>就在欧美日通过WTO诉讼对中国稀土政策施压同时,一些产稀土国家稀土开采重启计划也进入了实质阶段。《经济参考报》记者日前采访业内人士表示,包括马来西亚、澳大利亚等国家在内的稀土矿山开发和冶炼等多个项目运作非常顺利,预
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发布时间：2024-04-01 - 摘要：Defects of the hot-forging brass valve,its failures in the service process and forming reasons were described by analyzing raw material,hot forging process,product structure and mould design,installation ways as well as application environment,and so on.It is indicated that the inherent defects（such as coarser grain,strip structure,shrinkage porosity and segregation,and so on） of the hot-forging brass valve are responsible for the product’s reliability and failure in the service process.The alternative solution measures were put forward through analyzing failures of the hot-forging brass valves used in air-conditioner.关键词：Brass Valve;Hot-Forging;Defect;Failure;Crack;Stress
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发布时间：2024-04-01 - 摘要：The weldability of brass was described,and the design method and the welding operation points for oxyfuel gas welding brass were presented.Meanwhile,some application examples were showed.During gas welding brass,welding wires with Si must be considered.The Si oxidized film formed could cover the surface of molten pool,which not only restrained the further evaporation and burning loss of Zn,but also effectively prevented hydrogen from the melt to reduce the generation of hydrogen gas hole in welding joint.Weak oxidizing flame should be used in gas welding brass,which could prevent ZnO from reduction and decrease gas hole defects through keeping CO2 with high concentration at welding zone to form a layer oxidized atmosphere on surface of liquid brass.关键词：Brass;Oxyfuel Gas Welding;Application
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发布时间：2024-04-01 - 摘要：Characteristic parameters of a centrifugal casting large thick-walled bronze worm wheel and preventing measures of defects were analyzed.It was introduced for material of mould design,selection of wall thickness of mould and the calculation of thermal balance of the mould.It was paid attention to selecting and matching processing parameters as well as designing gating system.The defects possible occurred in the bronze worm wheel in vertical centrifugal casting were analyzed,and countermeasures were presented.关键词：Tin Bronze;Vertical Centrifugal Casting;Large Thick-walled Worm Wheel;Defect
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发布时间：2024-04-01 - 摘要：<正>近年来,我国铝合金压铸件的产量逐年攀升,发展十分迅速。据国际模协秘书长罗百辉分析,一方面由于在汽车轻量化趋势的带动下,全球铝合金压铸件市场出现了巨大的需求,并且随着近年来汽车行业内部优化升级,逐步用铝
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发布时间：2024-04-01 - 摘要：<正>WALLINGFORD,CT,2012年9月12日-摩根熔铸系统（MMMS）,是世界公认的在有色金属坩埚设计和制造方面的领头羊,已任命Aniruddha（Andy）Karve博士为其全球运营副总裁。驻印度的Karve博士将凭借其丰富的制
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发布时间：2024-04-01
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