最新刊期
卷 32 ， 期 4 ， 2012
- 摘要：Microstructure of ZA35 alloy with different Ti additions was observed by XRD（X-ray diffraction） and metallurgical microscope,and the effects of Ti on the electrochemical corrosion behavior of ZA35 alloy were investigated by open circuit potential test and potentiodynamic polarization measurement.The results show that the corrosion current density of ZA35 alloy with 0.1% Ti addition is reduced by 56.2% in 3.5% NaCl solution,compared with that of ZA35 alloy,greatly improving the corrosion resistance of the ZA35 alloy,which is attributed to the grain and dendrite refinement resulting in the obstacle of fine grain boundary by corrosion product in 3.5% NaCl solution.关键词：ZA35 Alloy;Ti;Microstructure;Electrochemical Corrosion
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发布时间：2023-12-18 -
Microstructures and Mechanical Properties of Mg-3.0Nd-1.5Gd-0.25Zn-0.5Zr New Casting Magnesium Alloy
摘要：The microstructures and mechanical properties of Mg-3.0Nd-1.5Gd-0.25Zn-0.5Zr new casting magnesium alloy were investigated.It is found that the microstructure of the as-cast experimental alloy is composed of near equiaxedα-Mg matrix and（α-Mg+Mg12Nd）eutectic structure distributed along the grain boundary.The optimized aging process parameters were determined by investigating age hardening response of the experimental alloy.The results show that the room temperature yield strength of the experimental alloy after T6heat treatment is apparently superior to that of ZM6commercial alloy.In addition,the high temperature tensile strength,yield strength and the creep resistant of the experimental alloy are obviously superior to those of the ZM6alloy.关键词：Magnesium Alloy;Solid Solution Treatment;Microstructure;Age Hardening;Mechanical Property- 2
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发布时间：2023-12-18 - 摘要：Change of solidification parameters of GH4169 alloy during electroslag remelting process was simulated by the MeltFlow software,and effects of frequency variation on the parameters were analyzed.It is shown that solidification process parameters are decreased gradually with the increase of the frequency,and it is changed sharply with frequency lower than 40 Hz,and it is changed gently with frequency more than 40 Hz.Solidification process parameters are decreased gradually with the increase of the cooling rate from center to edge of remelting ingot.Trends of local solidification time,secondary dendrite arm spacing and Rayleigh number are consistent,and these parameters are equivalent in judging solidification structure,futhermore,the solidification structure is independent of these parameters with the frequency more than 40 Hz.The solidification process parameters in the power frequency are superior to those in lower frequency.Simulation results are well agreement with experimental ones,which shows that the simulation can predict the generation and level of defects in different processes to optimize technology and improve the ingot quality.关键词：ESR;Numerical Simulation;Local Solidification Time;Secondary Dendrite Arm Spacing;Rayleigh
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发布时间：2023-12-18 - 摘要：<正>圣泉集团铸造用泡沫陶瓷过滤器,以其国际领先的卓越品质、超强的市场竞争力、显著的环保节能低碳等社会效益及生态效益,通过了科学技术部、环境保护部、商务部及国家质量监督检验检疫
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发布时间：2023-12-18 - 摘要：<正>近日,国家发改委公示2011年度729家国家企业技术中心评价结果,圣泉技术中心作为行业内唯一国家认定的企业技术中心,以86.1分的成绩,位列第52位。国家级企业技术中心由国家发展和改革委员
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发布时间：2023-12-18 - 摘要：<正>据了解,山西省晋城市为了加快工业化进程,对外吸引投资工作取得了良好的效果,吸引了多家公司投资入住工业园区,其中铝合金项目居多。据统计,今年山西晋城市工业园区铝合金铸造部件等
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发布时间：2023-12-18 - 摘要：<正>2010年,新材料作为七大新兴战略性产业之一在未来拉动经济发展上被寄予厚望。2011年发布的《新材料产业"十二五"发展规划》中更是强调,要在关键新合金品种开发上取得重大突破,基本满足大飞机、轨道交通、节能与新能源汽车等需求。中国商飞公司副总经理、C919大型客机项目总设计师吴光辉告诉记者,国产大飞机
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发布时间：2023-12-18 - 摘要：<正>为响应中央提出建设节约型社会、创建循环经济体系的政策方针;在倡导缺陷铸件科学修补新理念,全面、快速提升铸造缺陷修补机技术的普及应用;提高我国铸造企业的市场竞争力;为国家减少能源浪费、为企业挽回巨额废品损失等方面发挥业
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发布时间：2023-12-18 - 摘要：<正>总投资10.5亿元的永和装备产业园近日在高密城北工业区开工建设,项目规划建设5个汽车发动机部件大型加工中心,总建筑面积10万平方米,主要为宝马、大众、奥迪等汽车发动机制造公司生
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发布时间：2023-12-18 - 摘要：Influence of Zn,Mg and Cu elements on mechanical properties and hot cracking tendencies of cast Al-Zn-Mg-Cu alloys were investigated by using orthogonal experiment method.The results show that the influence of three elements on the tensile strength and hot cracking tendency of alloys is distinct.The influencing sequence on the tensile strength is as follows:Zn>Mg>Cu,while the order of affecting hot cracking tendency is Cu=Mg>Zn.In the experiment range,tensile strength and hot crack tendency are increased with increasing in Zn content,and decreased with increasing in Cu content,respectively.However,with Mg content increases,tensile strength shows firstly increased and then decreased,while hot crack tendency shows firstly decreased and then increased.The eutectic phase with low melting point and along the grain boundary has important effect on tensile strength and hot cracking,where with the eutectic number increases,tensile strength is decreased,and hot tearing tendency is firstly reduced and then increased.关键词：Cast Al-Zn-Mg-Cu Alloys;Alloy Contents;Hot Cracking Tendency;Tensile Strength
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发布时间：2023-12-18 - 摘要：The appearance characteristics of typical defects including misrun and cold shut,porosity as well as sand burning in aluminum（magnesium） alloys were investigated during the expendable pattern shell casting with vacuum and low pressure,and the forming mechanism of these typical defects were analyzed.Finally,the control measures for the corresponding defects were presented.The results show that misrun and cold shut defects are generated as a result of lower filling velocity of the molten metal,insufficient filling capacity and lower casting temperature,etc.The porosity defects occur due to faster pouring speed,lower holding pressure or holding time,higher casting temperature,unreasonable design of the gating system and poorer permeability of the ceramic shell,etc.The sand burning defect is formed because of lower strength of ceramic shell,higher filling pressure and vacuum level,larger particle size and poorer cooling ability of sand.关键词：Aluminum（Magnesium） Alloys;Expendable Pattern Shell Casting With Vacuum and Low Pressure;Typical Defects;Formation Mechanism
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发布时间：2023-12-18 - 摘要：The liquid steel flow field in a wide slab continuous casting mould under different electromagnetic parameters was simulated by the Fluent 6.3 software.The results indicate that the electromagnetic brake can not only control the flow of liquid steel in the mould,but also change the flow direction,and then to improve the redistribution of the liquid steel flux in the slab continuous mold.The flow in the upper eddy is strengthened,and the flow in the lower eddy is weakened,so the fluctuation of meniscus is improved in role of static magnetic field.关键词：Slab Continuous Casting;Mould;Electromagnetic Brake;Flow Field
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发布时间：2023-12-18 - 摘要：<正>随着中国、巴西、俄罗斯、印度在铸造领域之间的合作与交流日益广泛,在世界铸造领域影响力越来越大,在"2010年国际铸造论坛"上,由中国铸造协会首倡,得到巴西铸造协会、俄罗斯铸造协会、印度铸造协会赞同与支持,并由巴西铸造协会承办的首届金砖四国（BRIC）铸造高层论坛,和展会同期在巴西圣保罗举行。
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发布时间：2023-12-18 - 摘要：<正>"第八届印度国际铸造技术、设备和辅料展览会"及"第三届印度铸件展览会（IFEX）"于2012年3月2～4日在班加罗尔市召开。展会同期举办了"第60届印度铸造大会"和"第二届亚洲铸造论坛"。本届IFEX展览面积15000平方米,展商300余家,观
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发布时间：2023-12-18 - 摘要：<正>2012年3月1～3日,第二届亚洲铸造论坛在印度班加罗尔市隆重举行,本届论坛由印度铸造协会主办,中国铸造协会、日本铸造协会、蒙古冶金协会和台湾地区铸造品工业同业公会协办。论坛以亚洲铸造业可持续发展为主题,来自印度、中国、日本、巴基斯坦、蒙古、英国和中国台湾的30余位代表出席会议。中国铸造协会
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发布时间：2023-12-18 - 摘要：<正>企业通过每年一届的"全国铸件缺陷修补新技术研讨会",引进应用一些科学的铸造缺陷修补新技术,为本企业解决铸造缺陷报废难题现已成为共识。为了充分发挥业内主流媒体的作用,使更多的企业,通过缺陷铸件修复再制造工程,迅速降低铸件废品率,显著创造效益,《铸造》、《铸造技术》、《特
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发布时间：2023-12-18 -
- 摘要：A comprehensive review on the process materials in aluminium melt tribocorrosion environment was condicted.focusing on the types of recently developed durability of materials in molten aluminium tribocorrosion environment,corrosion resistance of metals and abrasion resistant.It is pointde out that the materials in aluminium melt tribocorrosion environment should be paid attention to the high-temperature alloy,intermetallic compound and ceramic/metal composites.关键词：Motlen Auminium;Corrosion;Wear and Friction;Interactive Function
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发布时间：2023-12-18 - 摘要：We have developed two sets of power ultrasonic double vibrating head equipment to prepare semi-solid A356 alloy slurry.Effects of different arrangement way of the double vibrating heads with power of 1 000 and 1 500 W,such as transducer arrangement flow channel and the opposite direction arrangement flow channel apparatus,on microstructure of semi-solid A356 alloy were analyzed.The solidification mechanism of the alloy under ultrasonic power field was approached in a state of movement,and effects of mechanical effects,thermal effects and acoustic stream effects on grain size in the semi-solid A356 alloy were presented.The results show that the refinement and spheroidization of microstructure in the alloy treated is closely related to the arrangement of the vibrating head,where transducer arrangement flow channel is superior to the opposite direction.Microstructure of the alloy on the flow channel exhibits finer as a result of chilling effects and vibration effects during solidification process.The grain become coarse outside flow channel,and the grain is spheroidized due to the co-action of inclined flow channel and ultrasonic.关键词：Power Ultrasonic;A356 Alloy;Semi-solid;Crystallization
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发布时间：2023-12-18 - 摘要：The air conditioner driven plate of far was produced by direct squeezing casting and by indirect squeezing casting.Two kinds of mould with different structures designed could produce the qualified moving-plate parts based on the structural characteristics of the components.The structural characteristics and working principle of the two moulds were described.Through the hardness test,the hardness of parts produced by the direct squeezing casting is 5% ～10% higher than that of one produced by indirect squeezing casting.However,the indirect squeezing casting is more complicated in the size-control,and difficult to guarantee the dimensional accuracy of the product.关键词：Squeezing Casting;Filling;Solidification;Process Analysis
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发布时间：2023-12-18 - 摘要：Combining dimensional accuracy and tolerance standard at home and abroad,dimensional accuracy of die castings was analyzed.The change of castings dimension in mould and out mould as well as mould with temperature change was quantitatively analyzed.Through practical product,effects of some defects in the die castings,such as thermal deformation,contract and difficulty to push out,on dimension of the die castings were described,and countermeasures were presented.关键词：Die Castings;Dimension Accuracy;Thermal Deformation;Defects;Countermeasures
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发布时间：2023-12-18 - 摘要：Influences of the apparent viscosity and pouring temperatures of the semi-solid aluminum alloy on filling and solidification process of the die casting housing cap bearing were analyzed by numerical simulation method.The simulated results show that the filling velocity of the semi-solid aluminum alloy is decreased markedly with the increase of the apparent viscosity,while the influence of the pouring temperature on the filling velocity in semi-solid die casting is consistent with that in the traditional die casting.The solidification temperatures at the same position of the housing cap bearing are increased with the increase of the apparent viscosity of the semi-solid aluminum alloy.The absence of casting defects in the solidified castings can be observed.关键词：Semi-Solid Aluminum Alloy;Die Casting;Apparent Viscosity;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Nonlinear dynamic effects of mould-locking force sensor,as one of the main die-casting machine monitoring sensor,affected the measurement accuracy and measuring range,resulting to be disadvantageous to standard production.In order to solve the problem,least squares support vector machine（SVM） method was adopted to compensate nonlinear dynamic sensor,meanwhile,the algorithm is modified.In addition,numerical simulation was conducted.The results show that the measuring accuracy and measurement range of nonlinear dynamic compensation sensor based on modified least squares support vector machine（SVM） are greatly improved,increasing the production efficiency.关键词：Rated-Locking Force Sensors;Nonlinear Dynamic Compensation;Dynamic Error;Modified The Least Square Support Vector Machine（SVM） Method
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发布时间：2023-12-18 - 摘要：Design of gating system and selection of materials played an important role in filling and solidification process of low pressure casting aluminum alloy wheel.The roles of gate sleeve with different materials in gating system were described by comparatively analyzing effects of ceramic gate sleeve and conventional metal gate sleeve on processing stability.The results reveal that conventional metal gate sleeve possesses rapid corrosion behavior and high thermal conductivity,resulting in difficulty to adjust casting process with apparent fluctuation,meanwhile,it is significantly affected by environment and raw material temperature.Ceramic gate sleeve exhibits the features of high corrosion resistance and high insulating behavior as well as high temperature resistance,which can effectively make sure the temperature of feeding channel to ensure the feeding efficiency when the cooling rate of the other location of the wheel is increased,greatly improving the production efficiency.Meanwhile,quality of the aluminum alloy wheel is obviously improved as a result of smooth feeding channel.In addition,the rejected materials of the solidified riser is half of the conventional metal materials.关键词：Aluminum Alloy Wheels;Ceramic Gate Sleeve;Low Pressure Casting
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发布时间：2023-12-18 - 摘要：Al alloy cylinder bottom-end is one of the key parts for the vehicle engines,and it is difficult to produce by die casting due to its complicated structure.Al alloy cylinder bottom-end was produced successfully by die casting base on considering its structural characteristics.The defects such as gas pore,shrinkage porosity and insert-separation are successfully eliminated by some measures including optimization of venting and shot parameters,die cooling and pre-heated treatment of inserts,improving the quality and decreasing rejected rate.关键词：Die Casting;Al Alloy;Engine;Cylinder Bottom-end
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发布时间：2023-12-18 - 摘要：Considering the structural features,through analyzing the forming process and combining with the die casting machine from the enterprise and technological parameters,die casting die was designed.The parting face of the mould was set at the longitudinal maximum section.Due to requiring large pulling-core distance at side-hole of the tube joint,two-directional pulling-core mechanism with side-core slanted guide pillar was designed.Through designing ring-gate in gating system,smooth filling could be realized as a result of avoiding the molten metal directly impacting core,improving the inner and surface quality of the die castings.Push-put mechanism was set at ring-gate location and overflow slot location,improving greatly the surface quality of the tube joint.关键词：Die Casting;Mould Design;Aluminum Alloy
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发布时间：2023-12-18 - 摘要：Through measuring the wettability angle of ZL114A melt on different characteristic coating surface and the surfaces roughness of corresponding castings,the effects of free energy and particle size of refractory in coating on surface roughness of the castings were analyzed based on wetting model.The experimental results show that the wettability of the melt on coating surface become worse,and the surface roughness of the castings is decreased with the decrease of surface free energy of coating material.The wettability of aluminum alloy melt on the talcum powder coating surface with low surface energy is firstly decreased and then increased with decreasing in talcum powder particle size,and so do the corresponding surface roughness of casting.With the talcum powder particle size of 43 μm,and the wetting angle between coating and aluminum alloy melt reaching to 155°,the corresponding surface roughness of castings is 0.584 7 μm.关键词：Surface Free Energy;Wettability;Particle Size;Surface Roughness of Casting
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发布时间：2023-12-18 - 摘要：The cooling curves in solidification process of investment casting are very important for the inverse calculation of simulation parameters in ProCAST software.The cooling curve in solidification process of steel investment casting was measured and a method was put forward.The cooling curve of steel investment casting with a higher precision was presented through experimental test.关键词：Investment Casting;Cooling Curve;Solidification Process;Test Method;ProCAST Software
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发布时间：2023-12-18 - 摘要：Based on the modeling software,the product and V-process mold design for the Q80 track shoe were conducted.Through pouring,the Q80 type track shoe with complete shape and clean quality was manufactured successfully.The production process and the quality control were introduced.Compared with the traditional silicate-bonded sand casting process,the V-process exhibited the advantages in surface quality and dimensional precision.According to the cost counting,the V-process had reduced distinctly the cost per product in molding.关键词：V-Process;Wear-resistant Cast Steel;Surface Quality
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发布时间：2023-12-18 - 摘要：In order to improve mechanical properties of the high chromium cast iron liner,the specimens were produced by electromagnetic centrifugal casting,and were comparatively analyzed with conventional casting specimens.The results show that microstructure of the electromagnetic centrifugal casting specimens is refined significantly,and grains are increased with the decrease of the grain size,evidently improving the mechanical properties of the specimens.With centrifugal velocity of 1 500 r/min and magnetic induction intensity of 0.5 T,the hardness and impacting toughness of the electromagnetic centrifugal casting specimens reach HRC 55.3 and 6.87 J/cm2,respectively,and after heat treatment,hardness and impacting toughness reach HRC65.3 and 7.3 J/cm2,respectively.Compared with those of the conventional casting ones,hardness,impacting toughness and relative wear resistance of the specimens prepared are increased by 10%,8% and 5%,respectively.关键词：Electromagnetic Centrifugal Casting;Hardness;Impacting Toughness;Wear Resistance
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发布时间：2023-12-18 - 摘要：<正>加拿大汽车研究组织AUTO21以及其赞助伙伴已经总获得518,400加元的资金用于Arch Biopartners公司的开展稀土镁合金的抗腐蚀项目的研究。AUTO21是加拿大政府支持的全国性汽车研究机构。该项目研究通过加入稀土元素以及使用绿色生物有机金属涂层来加强应用于汽车上的镁合金的抗腐蚀
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发布时间：2023-12-18 -
Preparation and Microstructure of WC Particles ReinforcedHigh Chrome Steel Matrix Surface Composites
摘要：WC-particle reinforced high chromium steel matrix surface composites were prepared by V-EPC（vacuum-expandable pattern casting） infiltration.The results show that WC particles are uniformly distributed into the compound layer of high Cr steel composites with different volume of WC particles.Through the co-action of particle melting,element diffusion and infiltration of liquid steel,the microstructure of the composites prepared is composed of eutectic structure of WC and W2C,un-dissolved high Cr steel particle and precipitated carbide phase.关键词：Vacuum-Evaporative Pattern Casting（V-EPC）;WC Particles;Surface Composites;High Chromium Steel- 2
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发布时间：2023-12-18 - 摘要：Hypereutectic Al-Mn alloy and its Al2O3 particulate reinforced composites were prepared by stirring casting,and the microstructure of the two materials prepared was observed.Meanwhile,it was paid attention to the effects of different abrasive content and abrasive particle size on the erosion wear resistance of the two materials prepared.The results show that the Al-Mn alloy is mainly composed of aluminum-manganese solid solution phase,MnAl6 and Al11Mn4 phase,while δ-Al2O3 particles can be observed in the composite besides the mentioned microstructure.The wear loss rate of the two materials with the 3% abrasive addition is obviously higher than that of ones with the 1% abrasive addition.In addition,the weight loss rate of the two materials is firstly increased and then decreased with the increase of abrasive particle size.Furthermore,with the increase of abrasive contents,the maximum of wear loss rate moves toward the larger particle size.In addition,hypereutectic Al-Mn matrix composite is much better than hypereutectic Al-Mn alloy in erosion wear resistance with the same Mn content.关键词：Hypereutectic Al-Mn Alloy;Particulate Reinforced Composite;Erosion Wear;Abrasive Content;Abrasive Particle Size
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发布时间：2023-12-18 - 摘要：In-situ primary Si and Al3Ni hybrid particles reinforced Al matrix composite tubes were fabricated by centrifugal casting.Microstructure and properties of the composites were investigated by OM（optical microscope）,XRD（X-ray diffraction）,SEM（scanning electron microscope） and Rockwell hardness tester.The results show that,the composite components produced possess microstructures accumulating lots of Al3Ni particles and a part of primary Si particles in the outer layer,and a little Al3Ni and lots of primary silicon particles in the inner layer,and no any primary particles in the middle layer.From outer layer to inner layer,the volume fraction of reinforcement particles are firstly decreased and then increased.The hardness of composites presents the same change rule as the volume fraction of particles.The movement rule of multiphase flow in the centrifugal field was analyzed.The distribution of reinforcement particles is relative to the density of primary Al3Ni and Si particles and collapse as well as adhesion each other under the high G parameter.关键词：Centrifugal Casting;Primary Si;Al3Ni;Aluminum Matrix Composites
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发布时间：2023-12-18 - 摘要：Influences of solid solution plus aging treatment（T6） on the cyclic stress response behavior,fatigue life and fracture behavior of die-cast AE42 magnesium alloy were investigated.The results show that AE42 magnesium alloys in different conditions as die-cast state and T6 heat treated state exhibit the cyclic strain hardening during fatigue deformation.Meanwhile,T6 heat treatment can improve the cyclic stress amplitude and fatigue life of the die-cast AE42 alloy.The observation of the fracture surfaces shows that the fatigue cracks are generated at the free surface of the specimens,and propagated in a transgranular mode.关键词：Heat Treatment;Die Casting;Cyclic Stress Response;Low-Cycle Fatigue;Fatigue Life
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发布时间：2023-12-18 - 摘要：The thermal cycling curves of ZAlSi7Cu4 treated by different heat treatment were drawn on a self-restrict thermal fatigue experimental machine at 25～350 ℃ to understand the effect of different heat treatment processes on the thermal fatigue behavior of the alloy.The thermal fatigue mechanism was analyzed by observing thermal fatigue crack morphology of the alloy samples with the help of OM（optical microscope） and SEM（scanning electron microscope）.The results show that the sample with T6 heat treatment is superior to one treated by other process in thermal fatigue resistance at 350 ℃.The expansion path of the crack can be controlled by the location of the grain,and the crack generation in the edge of the cavern can be slowed down with a higher curvature radius.The micro-hardness of the sample surface is decreased with the increase of the thermal cycle number,however,the microhardness of the samples treated by T6 and as-cast quenching plus aging has a slightly ascension in the period before the initiation of the crack.关键词：ZAlSi7Cu4;Thermal Fatigue;Generation;Expansion;Micro-Hardness
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发布时间：2023-12-18 - 摘要：Design methods and process of gravity casting moulds for turbocharged pistons were presented,which broken the traditional design idea.Blank weight was reduced,and processing efficiency was improved through reasonable improvement of metal mould design and process measures,which could take the moulds to reach the use requirements at the technique level and get ideal castings.关键词：Gravity Casting;Mould;Process
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发布时间：2023-12-18 - 摘要：Grain size in the semi-continuous casting 7050 aluminum alloy could be refined significantly with imposing ultrasonic power.Cavitation bubble co-vibrating mechanism in the aluminum alloy melt was analyzed by theoretical calculation and experiment based on crystallization thermo-dynamics and kinetics.The results reveal that cavitation effects can greatly increase the vibrating energy of grain nuclei,which is responsible for the refinement of grain size as a result of apparently increase the vibrating frequency of the nuclei.The effect of cavitation is quantitatively analyzed for energy transfer and change of vibrating frequency of the nuclei in 7050 aluminum alloy during semi-continuous casting process.In addition,effects of frequency of cavitation bubble and its initial equilibrium radius on nuclei vibrating frequency and nucleation in aluminum alloy melt with ultrasonic treatment were approached.关键词：Cavitation Effect;Nuclei Vibrating Frequency;Nuclei Vibrating Energy;Initial Equilibrium Radius;Theoretical Calculation
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发布时间：2023-12-18
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