最新刊期
卷 31 ， 期 1 ， 2011
- 摘要：In order to refine reinforced-phase in Al-18Si-xFe alloy,a novel method of wavelike sloping plate（WSP）rheocasting process for preparing hypereutectic Al-18Si-xFe alloy was proposed,and microstructure formation mechanism of the alloy during wavelike flow and cooling process was investigated.The results show that morphology of primary Si,Al18Si10Fe5and Al8Si2Fe phase in the Al-18Si and Al-18Si-5Fe alloy can be refined greatly by the WSP rheocasting.With the decrease of pouring temperature and the increase of cooling strength of sloping plate,various phases tend to be refined and spheroidized.Formation of microstructure in the alloy can be attributed to crystal nucleus multiplication brought by crystallization rain,crystal restraining growth under strong cooling of sloping plate and crystal broken-up under flow shearing.关键词：Wavelike;Sloping Plate;Rheocasting;Microstructure;Hypereutectic Al-Si Alloy
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发布时间：2023-12-18 - 摘要：Effects of notches on fracture morphology and fracture mechanism of casting TiAl alloy with monolithic orientation were investigated.Through observing fracture morphology,notches distinctly affect the lamellar structure of the alloy with monolithic orientation.During tensile testing process of smooth samples,crack is formed inside samples and then propagated to be broken,while for notched samples,micro-crack is generated at the edge of fracture,and then propagated in role of shearing stress to form steady propagation zone by each other connection.Furthermore,steady propagation zone is transformed into in-steady propagation under control of positive strain,so the crack propagation occurs.关键词：TiAl Alloy;Notch;Fracture Behavior
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发布时间：2023-12-18 - 摘要：AA6022 aluminum alloy containing Sc was prepared by casting combining with forging process.Effects of minor Sc and aging process on microstructure and properties of the alloy were analyzed by XRD（X-ray diffraction）,OM（optical microscope）and SEM（scanning electron microscope）as well as tensile testing.The results show that grain size in the alloy can be obviously refined with 0.15%～0.3% Sc addition,and average grain size is decreased from 323μm to 31μm.Tensile testing results reveal that elongation of the alloy is obviously improved with slight increase of tensile strength with Sc addition after natural aging process（T4 state）.However,with holding at 175℃ for 30min,strengthening baking effect is not improved with decreasing in elongation.With peak aging treatment at 180℃ for 10h,effects of minor Scon strength of the alloy can be ignored,however,plasticity is greatly improved.关键词：AA6022 Alloy;Sc;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：<正>由于经济危机的影响,除少数国家外,全球各国铸件产量均有下降趋势,俄罗斯、芬兰、匈牙利等国下降最为明显。俄罗斯在2007至2009年,铸件产量下降46.2%（从780万吨降至420万吨）
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发布时间：2023-12-18 - 摘要：<正>力拓集团一位高层管理人士称,至2020年全球铝产量将增加67%,才能满足年增速5.3%的消费需求。力拓负责中东与北非地区的商务部副主席Amir Mirch认为,如果在2020年之前
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发布时间：2023-12-18 - 摘要：<正>国际铝业协会副秘书长Chris Bayliss在"2010年中国国际铝业论坛"上说,国际铝协向包括中国铝业公司和中国电力投资集团公司在内的下属27个大型铝业成员单位下发倡议
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发布时间：2023-12-18 - 摘要：<正>北美压铸协会联合美国镁压铸件生产企业和镁合金部件生产企业向美国国际贸易委员会（U.S.International Trade Commission简称ITC）提出申请,表示应该尽快结束对镁材料征收反倾销税的法令。
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发布时间：2023-12-18 - 摘要：<正>由中国、美国、加拿大3家铝材行业协会共同合作研究的项目中得出结论:铝制的汽车零部件可使汽车的温室气体排放量降到最低,并且可使汽车达到最佳的节能状态。
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发布时间：2023-12-18 - 摘要：ZrO2-Al2O3 honeycomb ceramic reinforced high Cr cast iron matrix composites were prepared by composite processing,and effects of composite processing on bonding interface and its properties were investigated.The results show that the composites exhibit desirable bonding interface and comprehensive performance by composite processing,where ZrO2-Al2O3 ceramic surface is nickelized and metal matrix is added with Ti.Impact toughness of the composites with quenching at 1050℃ and tempering at 350℃ reaches up to 5.2J/cm2,and micro-hardness at interface is 505.7,which improves greatly the relative wear resistance by 2.8 times compared to that of high Cr cast iron.关键词：ZrO2-Al2O3 Ceramics;High Cr Cast Iron;Wear Resistance;Interface;Plating Layer;Nickelization
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发布时间：2023-12-18 - 摘要：Aiming at problems in powder magnesium oxide curing agent for the phosphate binder bonded sand,a suspension curing agent with convenient and stable in application was developed.The results show that the suspension curing agent exhibits desirable performance in high suspension rate,storage stability and no-hardening for itself by adopting organic solvent as the carrier for the dispersion of magnesia and addition of suspension and stabilizer.关键词：Phosphate Inorganic Binder;No-baked Sand;Suspension Curing Agent;Suspension Rate;Stability
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发布时间：2023-12-18 - 摘要：Effects of minor Sb on as-cast microstructure and ambient as well as elevated mechanical properties of Mg-7Gd-3Y alloy were investigated by OM（optical microscope）,SEM（scanning electron microscope） and XRD（X-ray diffraction）.The results show that Gd5Sb3 and Y3Sb phase can be created with 1%Sb addition in the alloy,refining obviously size of the grain.Meanwhile,ambient and elevated tensile strengths increase by 3.35% and 5.3%,yield strength increase by 12.8% and 17.0%,and elongation decrease by 15.8% and 12.3%,respectively.关键词：Mg-7Gd-3Y Alloy;Sb;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Origination and formation mechanism of surface speckle corrosion on the 6063 extruded profile were analyzed by analogue bath solution,SEM（scanning electron microscope）and EPMA,and its countermeasures were presented.The results show that speckle defects belong to spot erosion,which is formed from aluminum dissolution around cathode phase of free Si and FeSiAl,classified by surface defects.The appearance of the speckle exhibits erosion pit with residual phase and partial residual phase free,which is related to excessive Si element and extrusion process.关键词：Aluminum Extruded Profile;Speckle Corrosion;Mechanism;Countermeasures
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发布时间：2023-12-18 - 摘要：Application of computer graphic processing technology in measurement of surface tension of liquid metals with sessile drop method was described,and detailed operation was introduced.Values of multi-parameters were examined with a higher accuracy by the method based on digital photography,Windows combining with AutoCAD,providing a coordinated measuring technology for surface tension of liquid metals.关键词：Computer Graphic Processing Technology;Digital Photography;AutoCAD;Alloy;Surface Tension;Sessile Drop Method
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发布时间：2023-12-18 - 摘要：Automatic enmeshment of 2D grid based on BFC was investigated,which overcame the problems in lower continuum of simulated results and lower adaptability for irregular region boundary in rectangular coordinates.Automatic enmeshment of BFC grid was developed for 2D single line domain regular graphic and 2D double-line domain arbitrary graphic based on analyzing DXF document by adopting elliptical partial differential equation generating BFC grid.The results show that the program exhibits desirable universality,which can realize automatic enmeshment for the most complicate region,meanwhile,generated grid can smoothly adapt to the curvature variation of physical domain,and grid distribution in physical domain seems to be desirable.关键词：BFC;Grid;DXF Document;Automatic Enmeshment
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发布时间：2023-12-18 - 摘要：AZ91 Dplate slab was fabricated successfully by twin-rolling semi-solid rheo-rolling casting technology,in which semi-solid slurry was prepared by low superheat pouring with a shear field（LSPFS）.Microstructure and texture of the semi-solid sheet slab were observed by OM（optical microscope）and XRD（X-ray diffraction）.The results reveal that the sheet slab is composed of primary Mg phase and Mg17Al12 phase.Along the cast-rolling direction,volumetric fraction of primary phase in the back-end sheet slab is higher than that in the front-end as a result of flow velocity of liquid phase faster than solid phase in semi-solid slurry,meanwhile,grain size in the surface is finer than in the centre of the sheet slab because of cooling effects of roller face on sheet slab.Obvious（0002）basic plane texture is absent in the middle region of transverse sheet slab,while significant orientation of cone plane（1011）and prism plane（1010）at Mg matrix can be observed at edge position.关键词：Semi-solid;Magnesium Alloy;Rheo-rolling Casting;Microstructure and Texture
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发布时间：2023-12-18 - 摘要：Spheroidization of primary α-Al phase in semi-solid A356 aluminum alloy slurry prepared by a serpentine channel was observed.The results show that amounts of fine gain-free and dendrite can be created in the under-cooling alloy melt in serpentine channel as a result of chilling effects of inner-wall,in which the majority is drifted to the central zone of serpentine channel and multiplied,and then parts of are evolved into spherical grains and dendrite by spheroidization and ripening,and other parts are grown into dendrite with large size,关键词：Semi-solid;Serpentine Channel;A356 Aluminum Alloy;Primary α-Al Phase;Microstructural Evolution
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发布时间：2023-12-18 - 摘要：Microstructure and properties of die casting Ag-Mg-Ni alloy ring were investigated.It is found that although die casting Ag-Mg-Ni alloy ring exhibits near-net forming,there exist amounts of holes in the ring.Thickness of fine grain region in the alloy reaches up to 300～400μm,and Mg and Ni elements are uniformly distributed into the alloy in the absence of segregation.The density,hardness and electric conductivity of die casting Ag-Mg-Ni ring are 10.078 g/cm 3,44.6（HV0.2） and 43 MS/m,respectively,which are lower than those of casting-hot extrusion ones.关键词：Die Casting;Near Net Forming;Ag-Mg-Ni Alloy;Microstructure;Properties
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发布时间：2023-12-18 -
Die Casting Die with Combining Concave with Four Inclined Slides and Self-locked Stripping Mechanism
摘要：Aiming at the features in thin wall and in almost equal wrapping forces in moving die and fixed die,the design of the die casting die adopted combination concave with four inclined slides and sheet forming ejector pin as well as stripping mechanism locked by swing hooks,resolving the problems in ejecting the castings.Four inclined slides were jointed together by pins and interlinkage plate.During ejection,four inclined slides and the forming ejector pin were pushed forward by ejector and interinkage plate with ejector pins of machine tool,and castings were pulled out the moving die by the ejector pin.关键词：Inclined Slides;Side Parting;Swing Hooks;Die Casting Die- 2
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发布时间：2023-12-18 - 摘要：Using die casting engine cylinder body as an example,various devices for automotive die casting unites were described.Through analyzing layout plain,production process and work-out ration,measures improving production efficiency of the unites were introduced.Devices set on the production line for the automotive die casting unites were expounded,respectively.关键词：Automatic Die Casting Unites;Engine Cylinder Body;Product Line Layout
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发布时间：2023-12-18 - 摘要：There exist many different connection ways for riser-ingate with cavity in the die casting die.Graphic structure,filling behavior and other properties of thirty two connection ways were analyzed comparatively,which provided a reference for choosing connection way in design of die casting die.关键词：Die Casting Die;Ingate;Filling Ways
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发布时间：2023-12-18 - 摘要：New fully-hydraulic locking device with widely using range and desirable locking effects was presented,which was made of working oil cylinder,template,pusher pin,and so on,based on analyzing locking device mechanism at home and abroad.The Pro/E software was used to model the mechanism and to calculate displacement to ensure the device to meet the requirements of engineering design.关键词：Die Casting;Fully-hydraulic Locking Device;Mechanical Performance;FEM Analysis
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发布时间：2023-12-18 - 摘要：A new fault diagnosis method to hydraulic system for die casting machine based on FARX and RBFNN models was put forward.The ARX model after fuzzy processing not only retained its very sensitive response to fault state pattern,but also achieved more accurate description of non-linear features.Firstly,several FARX models were established for target system fault to extract their fault vectors.Secondly,the vectors were served as training source data and the RBF network classifier was established.Then,fault patterns could be identified according to the output of the classifier.A simulation verified the accuracy and availability of the method.关键词：Die Casting Machine;Fault Diagnosis;Fuzzy Auto-regressive with Extra Input Models;Radial Basis Function Neural Network
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发布时间：2023-12-18 - 摘要：Density of the die castings was improved as a result of effectively reducing gas hole in the castings through vacuum die casting.It was a key point for rapid exhaust in cavity in vacuum die casting,which directly affected the quality of die castings.Through analyzing flow process of gas in vacuum exhausting pipe,main factors influencing vacuum rate in cavity were investigated,and optimized processing parameters were presented to rapidly realize high vacuum rate in cavity.The results show that it is beneficial for rapid realization of high vacuum rate in cavity by setting exhausting pipe with large section and short distance and high exhausting speed as well as small cavity volume.关键词：Vacuum Die Casting;Gas Flow;Cross-sectional Area;Vacuum Rate
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发布时间：2023-12-18 - 摘要：Shrinkage porosity（hole）was often observed in casting pure copper electrode.Aiming at the characteristics of pure copper electrode,design of gating system and calculation of riser were performed,and origination of defects in practical pure copper electrode was analyzed.Availability of theoretical analysis was verified by numerical simulation.Through comparatively analyzing different gating system designs,optimized gating system was presented based on visualizing temperature field and cloud map of solid fraction.Practical production was conducted.Qualified pure copper electrode was successfully produced based on the optimized parameters,and its electric conductivity reached 56MS/m,meeting the technological requirements.关键词：Pure Copper Electrode;Investment Casting;Gating System Design;Numerical Simulation
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发布时间：2023-12-18 - 摘要：According to the structure characteristics of valve-body parts and using features,structure processing and casting scheme of the investment casting valve body parts were optimized to decrease or eliminate shrinkage porosity（hole）in the parts with the help of technological measures,improving the production rate in condition of keeping stable quality.关键词：Butterfly Valve Body;Investment Casting;Processing System;Part Structure
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发布时间：2023-12-18 - 摘要：It is difficult to produce cast-steel joint due to its complex structure and strict material requirements.There exist problems in difficult control to making precision of wood pattern and high cost as well as low product efficiency in conventional sand mold casting.Composite LFC-sand casting method was presented as follows:firstly,foam pattern was substituted for part of wood pattern,then it was broken after molding,and then sand core was set in cavity to pouring.Meanwhile,solidification process was simulated by the Huazhu CAE to optimize gating system design.The results show that foam pattern can improve degree of free and accuracy of cast-steel joint and effectively reduce cost as well as shortening time,meanwhile,cavity sand casting can ensure casting materials,integrating the advantages of two casting process.Optimization of gating system by the Huazhu CAE can decrease the waste of joint.关键词：Composite Casting;LFC;Sand Casting;Cast-steel Joint
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发布时间：2023-12-18 - 摘要：Nodular iron pipe was manufactured by means of suspension liquid as coating which was prepared by diatomite as refractory in inner-wall of pipe mold.Raw material for coating,coating preparation and its performance as well as proper coating ways were described.The experimental results show that bentonite slurry should be stirred for 2 hours continuously and then held for 10 hours to prepare coating.Diatomite is the desirable refractory for thermal mold coating.For pipe-mold with small aperture,bentonite content should be higher to some extent,where the weight ratio of diatomite content to bentonite is approximately（8～15）to 1,while for pipe mold with large aperture,bentonite content should be lower,where the weight ratio of diatomite content to bentonite is approximately（12～20）to 1.Spraying with gas was a acceptable access.关键词：Diatomite;Coating;Thermal Mold Method;Nodular Iron Pipe;Coating Way
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发布时间：2023-12-18 - 摘要：SiCp particle reinforced magnesium matrix composites were prepared for electronic packaging field by high intensity ultrasonic method.Effects of some parameters,such as particle,temperature,particle size,and particle volumetric fraction,on thermal expansion behavior of the composites were described.The results show that thermal expansion coefficient of the composites is decreased with addition of particle,and it is changed with varying in temperature.Meanwhile,with decreasing in particle size and increasing in volumetric fraction,thermal expansion coefficient of the composites is decreased.关键词：Magnesium Matrix Composites;Particle;Thermal Expansion Coefficient
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发布时间：2023-12-18 - 摘要：SiC particle was prepared by SHS.The reacted powder preforms were analyzed by SEM（scanning electron microscope）and XRD（X-ray diffraction）.The preforms were designed as inner-outer layer structure,where the outer consists of Ti powder and graphite powder with a molar ratio of 1:1,and the inner is composed of Si powder and graphite powder with a molar ratio of 1:1.The results show that the heat released from the formation of TiC in the outer layer can be used to inspire the reaction of Si powder and graphite powder to generate SiC particle.With a weight ratio of 4:1 of the outer and the inner at 1050 ℃,Si powder and graphite powder in the inner layer are fully transformed into SiC particle.关键词：Powder Preforms;SHS;SiC Particle
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发布时间：2023-12-18 - 摘要：A high Cr cast iron/nodular iron bimetal composites were prepared with adding high carbon ferro-chrome particles by centrifugal composite method.Microstructure of surface wear resistant layer on the composites and its tribological behavior under different loadings were investigated by MMS-1G frictional and wear tester,OM（optical microscope）,SEM（scanning electron microscope）and XRD（X-ray diffraction）.The results show that microstructure of the surface wear resistant layer is composed of tempered martensite,Cr7C3 phase,residual austentite,a little Cr23C6 and Cr3C phase.At the speed of 40m/s,with increasing in loading,frictional coefficient is decreased with approximately linear increase of weight loss.The wear mechanism is characterized by abrasive wear,oxidative wear and adhesive wear.关键词：Bimetal Composites;High Cr Cast Iron;Graphite Cast Iron;Frictional Coefficient
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发布时间：2023-12-18 - 摘要：Zr44Ti11Ni10Cu10Be25 bulk amorphous alloy was prepared by blowing out with copper mold casting,and superplastic diffusion bonding of the Zr-based amorphous alloy with Al foil was conducted in vacuum diffusion-welding equipment to understand atom diffusion behavior in bonding interface.The results reveal that diffusion of element is related to the deformation of samples to some extent.When deformation rate reaches a critical value,with increasing in temperature,diffusion rate of element is increased.The maximum diffusion rate of element in the interface can be observed with 26% deformation rate at 713K.关键词：Zr-based Amorphous Alloy;Superplastic Deformation;Diffusion Welding;Aluminum Foil
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发布时间：2023-12-18 - 摘要：Microstructure and mechanical properties of FSP MB8（Mg-1.5Mn-0.3Ce）magnesium alloy were investigated under different processing parameters.Experiments adopted constant welding speed of 60 mm/min with rotation speed of 800,1200 and 1800 r/min.The results reveal that original coarse rolled MB8 is refined to be equixed and uniform grains after FSP as a result of severe stirring of the pin and occurrence of dynamic recrystallization in the SZs（stirring zones）.Average grain size in the SZs is greatly refined from 16.5μm to 6μm with rotation speed of 800 r/min.Ambient testing results show that the tensile strength is distinctly decreased with the great increase of elongation after FSP.Elongation of the alloy after FSP with 1200r/min reaches up to 57%,which is 160% of initial elongation.Tensile fracture morphology of the alloy was observed by SEM（scanning electron microscope）,and fracture mechanism was analyzed.关键词：FSP;Mg-1.5Zn-0.3Ce;Grain Refinement;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Effects of Ce addition on as-cast microstructure of A356alloy with high Fe content were investigated by optical microscope（OM）,X-ray diffraction（XRD）,electron probe microanalyzer（EPMA）.The results indicate that coarse acicular Fe phase is converted into fine short-rod Fe phase in the alloy with Ce addition,however,length of acicular Fe is increased with excessive Ce addition.The minimum length of acicular Fe phase can be observed in the alloy with 0.4% Ce content.Ce can effectively refine the grain size of α-Al phase.Addition of Ce was deemed to take the desirable modification effects on eutectic Si phase with 0.4%～0.7% addition,however,the weakened modification effect was observed with Ce addition more than 0.7%.关键词：A356 Alloy;Fe Phase;Ce;Eutectic Si
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发布时间：2023-12-18 - 摘要：Effects of different Si contents on mechanical properties of cast Al-Si alloy for engine cylinder head were investigated.With increasing in Si content,ambient and elevated tensile strength of the alloy are firstly increased and then decreased,and maximum tensile strength value can be observed at eutectic point of the Al-Si alloy,especially improvement of elevated tensile strength.Hardness of the alloy is firstly ascended slowly and then raised dramatically at hypereutectic state.Compared with conventional Al-Si alloy for engine cylinder head,the prepared alloy exhibits desirable mechanical properties.关键词：Cast Al-Si Alloy;Mechanical Properties;Si Content;Hardness
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发布时间：2023-12-18 - 摘要：Art castings are integrated into sculpture and scientific technologies,showing special skill in production.Through demonstrating various art castings,typical environmental landscape design,Chinese modern art castings were described.关键词：Sculpture;Casting;Art
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发布时间：2023-12-18 - 摘要：<正>当阳铁塔（见下页）北宋嘉佑六年（公元1061年）铸铁总高17.9m现存于湖北当阳玉泉寺塔共13层,仿木结构楼阁式,平面八角形,属古代最高铁塔塔座为双层须弥座
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发布时间：2023-12-18 - 摘要：<正>2010年有色金属设备发展论坛于11月21日在上海举行,这是国内有色金属行业首次举办的设备发展论坛。中国有色金属工业协会副会长陈全训到会致词,协会副会长尚福山作了主题报告
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发布时间：2023-12-18 - 摘要：<正>投资5亿元的特殊钢管精加工是核电管等高端管材的前端加工工序,和四川三洲特管成立的合资公司将在公司现有的马头工业区内开发核电用"U"型管、大口径精密钢管、超超临界管、精密航空用管等高附加值管材。
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发布时间：2023-12-18 - 摘要：<正>2010年11月1～4日,由中国铸造协会精密铸造专业委员会承办的2010年精铸出口企业年会在广东佛山举行。会议邀请了行业协会有关人士,有关的高校专家以及相关的精铸出口企业
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发布时间：2023-12-18 - 摘要：<正>近期,中色（宁夏）东方集团公司高铍含量铍铝合金产品批量出口以色列市场。这项具有自主知识产权的铍铝合金新产品是由西北稀有金属材料研究院与美国库力索法公司合作研发。
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发布时间：2023-12-18 - 摘要：<正>近日,新兴重工山西鸿达镁业公司新建"1.5万吨/年金属镁建设项目"顺利竣工。据悉,该公司1.5万吨/年金属镁建设项目采用了新工艺、新技术、新材料,提高了各项经济技术指标,降低了能耗和制造成本,并减少了环境污染。
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发布时间：2023-12-18 - 摘要：<正>日前,长三角地区最大的汽车压铸企业——雄邦压铸（南通）有限公司在江苏省通州市正式投产。该公司由香港雄邦实业投资,是一家集模具设计、制造、铝合金压铸
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发布时间：2023-12-18 - 摘要：<正>中国铸造协会日前在辽宁鞍山主持召开了福鞍铸业集团有限公司研制的岩滩水轮机新转轮叶片铸造技术评审会。经过生产现场和产品实物考察和科学严谨的评审、论证后,一致认为,该转轮叶片质量不仅满足了岩
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发布时间：2023-12-18 - 摘要：<正>根据工业和信息化部于2010年10月13日发布的工产业〔2010〕第122号公告--《部分工业行业淘汰落后生产工艺装备和产品指导目录（2010年本）》精神,摘录其中与铸造
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发布时间：2023-12-18 - 摘要：<正>中航重机2010年11月发出公告,拟以现金方式自筹65亿元人民币,在西安经济技术开发区投资建设工业基础产业园及其配套项目。其中工业项目投资35亿元,民品项目投资额不低
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发布时间：2023-12-18 - 摘要：<正>为做好铸造行业"十二五"规划编制工作,引导我国铸造行业又好又快发展,中国铸造协会近期采取积极措施,推进、落实、完成该项工作。该协会根据工信部和国家发改委以及中国
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发布时间：2023-12-18
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