最新刊期
卷 31 ， 期 12 ， 2011
- 摘要：Using Thermo-Calc thermodynamic software combined with the nickel-based database,the possible equilibrium precipitates in FGH96 superalloys containing 0.003% N and in FGH96 superalloys without N were calculated,and the solidification simulation of FGH96 superalloy has been made based on the Scheil-Gulliver solidification model.The effects of N on precipitate in FGH96 superalloy have been investigated by comparing the calculated results of two kinds of superalloys.The result show that,nitrogen content shows a great effect on the primary carbide phase MC+M（C,N） with a very limited contribution on the other phases;carbonitride M（C,N） mainly containing Ti and N is precipitated from liquid phase above liquidus temperature in FGH96 superalloy with a little N,while MC-type carbide is precipitated from residual liquid phase when the mass fraction of solid phase reaches 70% in FGH96 superalloy without N.It can be proposed by the result of thermodynamic calculation,SEM,and EDS that the primary carbonitride M（C,N） mainly as TiN is preferred to precipitate from the liquid FGH96 superalloy containing N,and then MC-type carbides are precipitated on the surface of M（C,N）,forming primary carbides as TiN nuclei.关键词：FGH96 Superalloy;Primary Carbides;Thermo-Calc Thermodynamic Calculation Software
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发布时间：2023-12-18 - 摘要：The semi-solid slurry of 7075 aluminum alloy was prepared with an inverted cone channel.The experimental results indicate that the semi-solid 7075 aluminum alloy slurry with satisfied quality can be produced with the inverted cone pouring pipe,and there exhibits only a thin layer on solidified shell inside the pipe with the pouring temperature of 660 ℃～690 ℃ and the inner wall conicity of 2°～6°.With a fixed conicity,the equivalent size of the primary α-Al grains is decreased and the shape factor is increased with decreasing in pouring temperature.With a given pouring temperature,the equivalent size of the primary α-Al grains is decreased and the shape factor is increased with the increase of conicity.The experimental results also show that a large number of nuclei of primary α-Al grains are formed on the inner surface of the inverted cone pipe,and most of them can be separated from the inner surface as well as grain ripen in the containing crucible during the slurry preparation,which is responsible for the generation of fine spherical primary α-Al grains.关键词：7075 Al Alloy;Semi-solid Slurry;Inverted Cone Pouring Channel;Primary α-Al Phase
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发布时间：2023-12-18 - 摘要：Microstructure and properties of single crystal copper wire in the condition of strong cold deformation were investigated to understand effects of strong cold deformation on microstructure and properties of single crystal copper wire and its formation mechanism.The results show that similar multi-crystal structure in strong cold deformed single crystal copper wire can be observed,which is attributed to special structure resulting in the generation of sub-grain and micro-phase in later deformation.Electric conductivity is decreased with increasing in deformation rate,where decrement-rate exhibits S line tends,slow-fast-slow.High working hardening rate on OCC single crystal copper rod can be observed during early deformation process,and the working hardening rate is decreased with strong cold deformation process,meanwhile,elongation is slightly decreased,and increment-rate of strength is decreased to a stable value.With elongation less than 3%,single crystal copper wire still realize severe deformation effects.关键词：Single Crystal Copper;Strong Cold Deformation;Microstructure
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发布时间：2023-12-18 - 摘要：A 3D-network Ni-Al（skeleton） reinforced aluminum alloy composites were designed and fabricated by vacuum suction casting combining vacuum heat treatment.The dry sliding wear behaviors of the composites prepared under various loads were examined.The results show that the wear resistance of composites is far superior to that of matrix alloys.It is supposed the network Ni2Al3（skeleton） intermetallic compound can be subjected to the load applied on the sliding surface as concave particles to restrain or delay the transformation of aluminum alloy from the mild wear to the severe wear.Meanwhile,it can uniformly transfer the load on the surface,inhibiting the loss of the aluminum alloy on wear surface from plastic deformation.The wear mechanism of matrix alloy is characterized by severe adhesive wear,and wear mechanism of the composites is mainly characterized by abrasive wear with slightly adhesion wear.关键词：3D-Network Ni-Al（Skeleton）;Composites;Wear Resistance;Wear Mechanism
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发布时间：2023-12-18 - 摘要：The flow stress behavior of 7B50 aluminum alloy was investigated at 300 ～ 460 ℃ and strain rates of 0.001～1 s-1 on the Gleeble-1500 thermal simulator.The results show that the flow stress is decreased with increasing in deforming temperature and increased with increasing in strain rate.Deformation temperature of 380～460 ℃ and the strain rate of 0.1～1 s-1 are the acceptable processing parameters.Partial recystallization occurs in the alloys deformed at a high temperature or at a low strain rate,and large number of dislocations and subgrains are observed in the alloy.The subgrain size is increased and the dislocation density is decreased with increasing in temperature and decreasing in strain rate.The main soften mechanism of the alloy is characterized by dynamic recovery to dynamic recrystallization.关键词：7B50 Aluminum Alloy;Hot Compression Deformation;Dynamic Recovery;Dynamic Recrystallization
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发布时间：2023-12-18 - 摘要：Aluminum foams produced by melt forming and gas injection processes were comparatively investigated,including fabrication procedure,foam structure,microstructure of cell wall,porosity and pore size,performance,and application,which provided a reference to appropriate selection of fabricating process in production and application.关键词：Aluminum Foam;Melt Forming;Gas Injection Forming
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发布时间：2023-12-18 - 摘要：The importance of cold model experiments in the modern industrial production was introduced,and testing method of mixing time,mass transfer and flow field of solute was approached.Meanwhile,different testing methods were classified and related application was presented.Finally,the testing method to flow field of molten-pool was summarized and compared.It was pointed out that during using cold model experiment process,traditional molten-pool display techniques should be combined with modern computer graph-treatment technology to realize the precision analysis of flow field.关键词：Cold Model;Detection;Metallurgy
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发布时间：2023-12-18 - 摘要：Theoretical basis and practical method in numerical simulation of casting thermal stress based on finite element method（FEM） were described,and a simulation program of casting thermal stress was developed.A typical specimen of stress frame has been used to validate the algorithm and program,the simulation results of commercialized software ANSYS and the actual casting castings are compared,and the results are well in agreement.The presented numerical simulation program of casting thermal stress based on finite element method can get well simulation results with reliable run.关键词：Casting Thermal Stress;Numerical Simulation;Finite Element Method
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发布时间：2023-12-18 - 摘要：A stochastic model for simulating the microstructure formation of twin-roll continuous casting pure aluminum during solidification process has been established based on a 3-D cellular automaton（CA）-finite element（FE）model in Procast package.Based on the finite element method（FEM）,macroscopic model of heat transfer calculation and a modified Cellular Automaton were established,in which the effects of solute redistribution,interface curvature,and preferred orientation were considered.Different Gaussian distribution of nucleation sites was adopted on the roll surface and in the melt,meanwhile,the modified KGT model related to partial undercooling was used to describe the growth kinetics of dendrite tip.The influence of processing parameters such as pouring temperature and average nucleation undercooling rate in the melt on the solidification microstructure of strip is evaluated.The simulation results show that the nucleation,growth,columnar-to-equiaxed transition（CET）,and microstructure evolution of free dendritic crystal can be predicted reasonably.关键词：Twin-Roll Continuous Casting;Solidification Structure;Cellular Automaton;Numerical Simulation;Processing Parameters
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发布时间：2023-12-18 - 摘要：we have developed a V-shaped subtended double power ultrasound vibration heads treatment device to understand effects of pouring temperature and inclined angle of flow channel on the microstructure refinement of semi-solid 5083 alloy.The results show that power ultrasound can refine significantly microstructure of 5083 alloy structure.With a fixed inclined-angle,the grain size and morphology are refined with uniform distribution in the alloy with increasing in pouring temperature（the selected range of experiment）.In addition,with the inclined angle of 20° which is selected in three pouring angle（10°,20°,30°）,the desirable refinement in microstructure of 5083 alloy can be observed.关键词：Double Vibration Heads;Power Ultrasound;5083 Alloy;Microstructure
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发布时间：2023-12-18 - 摘要：Semi-solid 5083 aluminum alloy billets were prepared by SIMA by hot extrusion with high extrusion ratio pre-deformation,and the evolution of reheating microstructures at different reheating temperatures and holding time was observed.The effect of key processing parameters on the microstructures and mechanical properties of thixo-rolled materials after one-pass rolling were analyzed.The results show that grain shape and liquid fraction are mainly controlled by reheating temperature during the reheating process,while role of holding time can be ignored.The strip exhibits the acceptable mechanical properties with tensile strength of 260.93 MPa and elongation of 26.81% after one-pass thixo-rolling with reheating temperature of 600 ℃ and pre-deformation of 60%.After two-passes cold rolling with 40% deformation,the tensile strength of the strip is improved by 70MPa.The macro-and micro-observation of the tensile fracture surface reveal that the fracture mechanism of the rolled samples is characterized by ductile fracture with micro-pore accumulation.
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发布时间：2023-12-18 - 摘要：Effects of squeezing casting parameters on mechanical properties and microstructure of ZL102 alloy components before and after heat treatment were investigated by orthogonal tests.The results show that grain size in the squeezed casting alloy components is finer than that in permanent mold castings.Compared with that of squeezed castings before heat treatment,the grain size in the squeezed castings after heat treatment is refined with more uniform distribution,meanwhile,tensile strength is improved by 4.5%,and elongation is increased from 0.74% to 1.78%.Through analyzing nine sets of processing parameters,the optimized processing parameters are presented as follows:pressure of 100 kPa,preheating mould at 150 ℃ and pouring at 630 ℃ as well as holding pressure for 14 s.关键词：Al-Si Alloy;Squeezing Casting;Orthogonal Testing;Microstructure and Properties
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发布时间：2023-12-18 - 摘要：The screw thread unloading is a difficult point for castings with screw thread in the design of die-casting die.Rack-conical gear structure for outer screw thread unloading was presented.Core with screw thread was rotated by gear transmission,and castings were static because of the restrictions by ingate residual materials,so castings left away from the core.The casting technology was discussed,and the working principle and process were presented.关键词：Rack;Conical-Gear;Outer Screw Thread;Die-casting Die
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发布时间：2023-12-18 - 摘要：It is inevitable to produce large amounts of magnesium scraps with rapid growth of the application of magnesium alloys,especially in the automotive and 3C industries.It has been bothering in the diecasting industries to recycle scraps with small volume,large specific surface areas and easy to be ignited（high-risk die-casting magnesium scrap）.A vacuum distillation technology and equipment for high-risk die-casting magnesium scrap recycling was developed.Attention was paid to the conditions for the vacuum evaporation and condensation of magnesium and their effects on the efficiency of the recycling,meanwhile,the working principle,performance and tech-economic features of the system were presented.
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发布时间：2023-12-18 - 摘要：Recovery and utilization of residual heating from investment casting process based on heat-pump technology were performed,meanwhile,geothermal was used to supplement inadequate residual heating and work-out condition.A heat-pump system with saving-energy,environmental protection and high efficiency was established.关键词：Heat-Pump;Residual Heating Utilization;Heating
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发布时间：2023-12-18 - 摘要：Casting defects in investment casting parts such as shrinkage porosity（hole） were commonly eliminated by setting gates or adding riser at hot spot position to form effectively feeding channel during cooling and solidification process,obtaining investment castings with excellent quality.The main principle of processing design is related to casting structure.Environmental effects on cooling and solidification process can be little considered to improve the design sketch with saving cost and more quality.Hot iron and chill are applied in the design to improve the quality of investment castings from cooling environment,and desirable application effects are presented.关键词：Hot Iron;Chill;Investment Casting
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发布时间：2023-12-18 - 摘要：Through the simulation of the filling process of LFC（lost foam casting） gray cast iron plate castings,influences of various processing factors on the pressure and thickness in gas gap in lost foam casting process were analyzed by a numerical simulation method.The results show that the filling ability of molten metal is dependent on the speed of the foam decomposition rather than its gravity.The speed is adjusted by automatic change of the pressure in gas gap and gas gap thickness each other.Finally,the mold filling becomes steady-state.The steady-state filling of the molten metal can be realized with the bottom pouring by combining with the theoretical calculation.And the pressure thickness and in gas gap are increased with the increase of the pouring temperature,the pattern density and thickness of coating,and they are decreased with the increase of vacuum rate and coating permeability.关键词：Lost Foam Casting;Pressure in Gas Gap;Gas Gap Thickness;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Large and medium-sized hollow castings,such as lathe bed castings on machine tool,were produced increasing in EPC,in which processing operation could be simplified greatly with a lower production cost due to the absence of wooden pattern preparation as well as a shorter production cycle.However,there exists casting defects frequently such as downslide,swell,misrun and so on,resulting in rejection,in the production of large and medium-sized hollow casting in EPC.For such castings,the special measures should be considered,including adding exhausting-channel or other mechanism,enlarging pressure head,increasing pressure-iron as well as setting special gating system,which could effectively reduce or decrease casting defects,improving the quality of castings and qualified rate.关键词：EPC;Large Hollow Castings;Defects;Special Process
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发布时间：2023-12-18 - 摘要：Effects of annealing treatment on the magnetic properties of Fe69Al5Ga2P9.65B4.6Si3C6.75 amorphous alloys were investigated at seven different temperatures.The experimental data indicates that,with increasing in the annealing temperature,the saturation magnetization is increased firstly,and then is decreased sharply,and maximum value of 628.76 emu/g is obtained at 450 ℃.The curves of coercivity are similar to remanence ratio curve,and a smaller value near 490 ℃ can be observed,showing good soft magnetic property.The results reveal that annealing temperatures at the biggest saturation capacity are different to that at the good soft magnetic property.The reasonable temperatures for the comprehensive magnetic properties are in range of 450 ℃～490 ℃.关键词：Amorphous Alloy;Annealing Temperature;Magnetic Properties
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发布时间：2023-12-18 - 摘要：WC particle reinforced Fe-C matrix recycled composites roll collar were fabricated with remelting recycled waste composite roll collar materials by centrifugal casting.Effects of different sliding velocities on wear and frictional behavior of the recycled composite collar were investigated with the help of MMS-1G high speed pin-disk frictional and wear testing machine and SEM（scanning electron microscope） at 100 N,150 N,200 N loads.The results show that with the increase of sliding speed,the wear rate of recycled composite layer appears small fluctuations,and the friction coefficient is decreased firstly and then increased slowly at 100 N,150 N and 200 N.At a fixed sliding speed,wear rate is increased and frictional coefficient is decreased with the increase of load.Wear mechanisms of recycled composites roll collar are mainly characterized by plowing wear and plastic formation at low speed,while with the high speed,it is characterized mainly by abrasive wear,adhesion wear and oxidative wear.关键词：Remelting;Centrifugal Casting;Recycled Composites Collar;Friction Property
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发布时间：2023-12-18 - 摘要：The sliding friction and wear behavior of aluminum manganese based composite materials,aluminum manganese alloy and pure aluminum were measured through using the M-2000 type tester with or without corrosion liquid,respectively,and their surface morphology was observed by LED 1430 VP type scanning electron microscopy.The results show that the cutting wear is predominant in the materials with the corrosive liquid while adhesion wear is dominant in the matirials without corrosion liquid,and the wear loss of the different materials is as follows:Al-Mn composites less than Al-Mn alloy less than pure aluminum.With the same Mn content,the wear resistance of the Al-Mn composites is obviously superior to that of Al-Mn alloy.关键词：Aluminum Manganese Alloy;Al-Mn Based Composites;Sliding Friction and Wear
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发布时间：2023-12-18 - 摘要：Bulk ultra-fine crystalline W-40Cu composites with compact structure were fabricated by spark plasma sintering（SPS） technique with super microcrystalline W-40Cu powders which were prepared by high energy ball milling technology.The effects of sintering temperature on the microstructure and properties of the composites were investigated.The results,show that with the increase of the sintering temperature from 800 ℃ to 950 ℃,the relative density,micro-hardness,and electrical conductivity of the composites prepared are increased.The composites sintered at 950 ℃ for 5 min make approximately 300～500 nm in W grain size,287HV in micro-hardness,relative density of 98%,and electrical conductivity of 17.9 MS/m.关键词：W-Cu Composites;Sparking Plasmas Sintering;Sintering Temperature;Ultra-fine Crystalline Microstructure
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发布时间：2023-12-18 - 摘要：Furnace-blocking in SCR shaft furnace was eliminated during continuous casting-continuous rolling SCR copper rod through practical production analysis.Lots of influencing factors and their damages to furnace-blocking in SCR shaft furnace were presented.Some corresponding measures,such as practical trial method,adjustment of fire-power control,varied combustion ways,and equipment innovation,were employed to greatly reduce shaft furnace fault and hearth losses,effectively decreasing the occurrence of furnace-blocking and obviously increasing the service life of the shaft furnace.关键词：SCR Shaft Furnace Burner;Furnace-Blocking;Fire-Power Control;Protection Measures
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发布时间：2023-12-18 - 摘要：The functional polymeric thin-film was prepared on the surface of AZ31 magnesium alloy by polymeric plating.The growth mechanism of polymeric film was investigated through analyzing cyclic voltammetry curves during polymeric plating.The results indicate that formation process of polymeric film on magnesium alloy surface undergoes three stages of nucleation,stable growth,and film thickening.Combined with salt spraying corrosion testing,the corrosion behavior of magnesium alloy surface was analyzed,and the optimized processing parameters were presented.关键词：Magnesium Alloy;Polymeric Plating;Polymeric Film;Corrosion
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发布时间：2023-12-18 - 摘要：Service conditions and failure mode of Chang’an Automobile 1.6MT wheels were analyzed,and analysis of original structure of wheel and its structure redesign of magnesium alloy wheels were conducted.The results show that the peak service stress of magnesium alloy wheels is decreased from 36.4 MPa to 28.4MPa,less than the limit of fatigue strength.Safety coefficient of fatigue strength design is increased by 28%.In addition,compared with that of aluminum alloy wheels,weight of the optimized magnesium alloy wheel is reduced by 2.kg,decreased by 32%.关键词：Magnesium Alloy;Wheels;Finite Element Analysis;Structural Redesign
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发布时间：2023-12-18 - 摘要：In order to understand the quick heat dissipation of ignition-proof behavior in the spray forming magnesium alloy with nitrogen as atomizing gas,the heat transfer between magnesium alloy droplet and gas during spray forming process were simulated by mathematical model.The results show that the atomizing gas velocity is decreased monotonically with the increases of spray distance.Droplet velocity increased firstly,and then decreased when it is equal to the gas velocity.Meanwhile,the maximum velocity is decreased with the increase of particle size.Heat transfer coefficient is decreased firstly and then increased,and it is increased with the decrease of particle size.The average heat transfer coefficient is more than 1 000 W·m-2·K-1.In addition,the temperature of the droplet is reduced.In the atomization stage,minimum velocity of heat transfer is far greater than maximum velocity of the heat released by the reaction between magnesium and nitrogen,so the production safety of spray deposited magnesium alloy with nitrogen as the atomizing gas is ensured as a result of eliminating the accumulation of heat during spray deposition.关键词：Spray Forming;Magnesium Alloy;Simulation;Heat Transfer
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发布时间：2023-12-18 - 摘要：Tensile strength and elongation of ZL205A purified by electro slag were measured with universal mechanical testing machine.The results show that tensile strength and elongation of ZL205A after purification are decreased greatly.The chemical composition of the sample purified was analyzed by direct-reading spectrometer.The results indicate that Ti content is decreased by approximately 48% in purified ZL205A.Through adding Al-Ti master alloy in purified aluminum melt,tensile strength reaches up to 486.29MPa,which is equal to that of the alloy before purification treatment,and elongation is 11%,increased by 100%.关键词：ZL205A;Electro-Slag Refining;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The effect of deformation and ageing treatment on microstructure and properties of AZ80 magnesium alloy were investigated.Firstly,AZ80 magnesium alloy is treated with solid solution treatment at 470 ℃ for 8 h.And then,it is hot-rolled with varied deformation rate at 400℃.Finally,the hot rolled magnesium alloy is treated with ageing treatment at 170 ℃ for 16 h.The results show that the grain size can be refined with the increase of deformation rate.With deformation rate of 80%,the average grain size is refined from 105 μm to 3 μm,and tensile strength reaches 282.49 MPa.Meanwhile,the elongation exhibits first increased and then reduced,where it can reach 24.21% with deformation rate of 50%.In addition,the yield strength is first reduced and then increased.关键词：Ageing Treatment;AZ80 Magnesium Alloy;Recrystallization;Rolling
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发布时间：2023-12-18 - 摘要：<正>思维菩萨（见下页）[1]唐代（公元 618～907年）通高11cm青铜上海博物馆藏菩萨盘膝而坐,左手屈肘撑于腿上,右手屈肘上抬,头右倾,双目微合,作思维状。菩萨高发髻,袒露上身,面相丰满,肌体圆润。丝绸般裙据贴于身躯,褶纹清晰,质感强
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发布时间：2023-12-18 - 摘要：<正>中国有色金属工业协会国际合作部主任边刚11月7日表示,"十二五"期间,我国铝产量目标为2400万吨。边刚是在"中国国际矿业大会"上作出上述表态的。根据中国有色金属工业协会的统计,截至去年年底,我国十种有色金属的产量为3424万吨,同比增长15.4%。
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发布时间：2023-12-18 - 摘要：<正>浙江佳力科技股份有限公司全资子公司浙江佳力风能公司完全自主研发、功率为6MW双馈式风力发电机底座等关键的零部件,顺利通过国电-联合动力技术有限公司的现场检验,正式启运至联合动力公司江苏连云港厂区,从而正式宣告该公司生产的5种6兆瓦风电铸
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发布时间：2023-12-18 - 摘要：<正>工信部原材料工业司副司长高云虎在2011年11月召开的第13届高交会上说,2010年,我国新材料产业的规模已超过6500亿元。与2005年相比,年均增速约20%。目前,《新材料产业"十二五"发展规划》已形成文本,未来还将可能与规划同时发布重点产品目录。
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发布时间：2023-12-18 - 摘要：<正>"2011中国国际镍钴年会"于2011年11月11～13日在广西沃顿国际大酒店召开。中国有色金属工业协会副会长王琴华女士出席开幕式并致辞。她说,2011年中国镍钴工业呈现以下特点:一是产量、消费量保持快速增长。预计全年原生镍产量43.3万吨,同比增加32.8%。
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发布时间：2023-12-18 - 摘要：<正>近日,一机再传捷报,十分公司静压铸造厂与瑞典欣特卡斯特公司联合进行的高蠕化率蠕墨铸铁试验圆满成功,蠕化率达80%以上,此举为一机集团开发高技术、高附加值蠕铁产品中克服技术瓶颈提供了保证,也为公司"十二五"规划铸造基地两条蠕铁生产线的投产提供了必要的技
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发布时间：2023-12-18 - 摘要：<正>世界金属统计局（WBMS）2011年11月16日称,2011年前9个月,全球铜市供应过剩23.68万吨。2010年全球铜市供应过剩1.82万吨。2011年前9个月,全球铜消费量为1439.5万吨,2010年全年消费量为1920万吨。同期中国表
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发布时间：2023-12-18 - 摘要：<正>由中冶赛迪集团有限公司设计并成套供货的新余钢铁股份有限公司特厚板连铸机成功生产出规格为420mm×1870mm的板坯,这是迄今为止,世界上由垂直弯曲型铸机生产的最大厚度板坯,钢种为中碳结构钢,连续浇注2炉,浇注速度0.5～0.6m/min
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发布时间：2023-12-18 - 摘要：<正>北京时间11月17日19时32分,举世瞩目的神州八号飞船与天宫一号目标飞行器空间交会对接后成功返回,为我国建设空间站迈出历史性关键一步。鲜为人知的是,神州八号飞船返回舱防热材料中有一重要原材料——高效空心填料是由中科院化学所研发、
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发布时间：2023-12-18 - 摘要：<正>圣泉与铸造企业同行——铸造新材料新技术全国巡回推广会（广州站国际专场）于2011年11月14日在广州市香格里拉酒店举行。会议邀请了圣泉战略合作伙伴--欧洲阿兹特兰冶金研究所的铸造专家
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发布时间：2023-12-18 - 摘要：<正>据彭博社消息,世界最大铝产商俄铝表示,由于全球高达15%的铝产能被闲置,2012年上半年铝产量将有可能下降。俄铝第一副总裁Vladislav Soloviev表示,中国、欧洲以及美国有可能将关闭部分铝厂。Soloviev在俄铝公布业绩之后透露,
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发布时间：2023-12-18
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