最新刊期
卷 34 ， 期 9 ， 2014
- 摘要：The change behavior of thermoelectromagnetic convection in silicon melt under the steady magnetic field during direction solidification of polysilicon was simulated by COMSOL Multiphysics version4.3abased on finite element method（FEM）.The results show that with 0≤B<0.4T,the flow region of silicon melt and average flow velocity are increased with increasing in the magnetic flux intensity.The magnetic field plays a promoting role in the flow of silicon melt.When the magnetic field intensity reaches 0.4T,the maximum of the average velocity in silicon melt is 60.15μm/s.With 0.4T<B≤1.0T,the flow region of silicon melt and average flow velocity are decreased with increasing in magnetic flux intensity,which is declined quickly compared with growth stage of flow.The inhibitory effect of the magnetic field on the flow rate of silicon melt exhibits obvious.Finally,influence of the thermoelectric magnetic force and electromagnetic force on the thermoelectromagnetic convection in silicon melt was described according to the theory of thermoelectric magnetohydrodynamic.关键词：Polysilicon;Thermoelectromagnetic Convection;Directional Solidification;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Al-12.5Si alloy was melted for directional solidification.Through adjustment of alloy composition,temperature gradient and solidification velocity,processing parameters for different eutectic morphologies such as eutectoid flat plane,cell grain,columnar grain,equiaxed grain,were presented in directional solidification.The effects of alloy composition,temperature gradient and solidification velocity on eutectic solidification modes were analyzed.关键词：Al-Si Alloy;Directional Solidification;Eutectic Interface Morphology;Temperature Gradient;Solidification Velocity
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发布时间：2023-12-18 - 摘要：<正>摩根士丹利（Morgan Stanley）9月1日在报告中援引国际铜研究组织（ICSG）的数据称,全球铜料出现7年来最大的供需缺口,或为铜价提供一定的支撑。报告称,全球1-5月铜市供需缺口为466,000吨,而2013年同期为供应过剩250,000吨。报告预计全球铜市今年铜料存在供需缺口90,000吨。ICSG公布的数据还显示,全球铜需求较上年增加15%,其中,中国需求强劲。
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发布时间：2023-12-18 - 摘要：<正>史杰克西集团总部设在古默斯巴赫,是轻金属铸造行业热加工技术的全球制造商。该公司提供用于压力铸造、重力铸造、砂型铸造、低压铸造和连续铸造解决方案。重点是定制的解决方案,让代工厂在生产过程中更加持久积极的进行制造和提供技术支持。史杰克西集团在25个国家设有轻合金铸造行业办事处及服务和分销合作伙伴,覆盖欧洲,亚洲和美洲。史杰克西集团（古梅斯巴赫）2013年的销售订单同比去年增长了9%,实际金额为5 700万欧元,比上一年增加了21%。"连续第四年两位数的增长证实我们选择的道路是正确的"集团CEO Rudi Riedel解释说,"我们的熔化系统高效的能源和材料效率
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发布时间：2023-12-18 - 摘要：A large aluminum alloy wheel rim for the vehicle was produced by the isothermal forging.During isothermal forging process,blank and mould keep the same temperature and constant strain rate to avoid the decrease of blank temperature during deformation process and cooled mould effects.Using throughout-hole extrusion and pre-producing blank,the required deformation rate can be realized through continuous reverse extrusion,greatly decreasing deforming force and eliminating the crack in wheel rim.关键词：Aluminum Alloy;Wheel Rim;Isothermal Forging
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发布时间：2023-12-18 - 摘要：SAF2906duplex stainless steel was nitrided at 610 ℃for 60,90,120,150 and 180min,respectively,then followed by the same post-oxidation process with heating temperature at 400℃for 30 min.The microstructure and wear resistance of the treated samples were investigated by means of OM（optical microscope）,SEM（scanning electron microscopy）,XRD（X-ray diffraction）,microhardness test and wear resistance test.Microstructure observation indicates that the surface layer of the samples after QPQ treatment is composed of oxide layer,compound layer and diffusion layer from the surface to the center.The oxide layer is composed of Fe3O4.The main phase of the nitrided layer,such as compound layer and diffusion layer,consists of CrN,α-N,Fe2-3N and Sphase.With nitriding time increase,the growth rate of the compound layer is gradually slowed down,and the loose microstructure exhibits more serious.Porosity of the surface layer is increased with the extension of time,and its relative density is declined.The surface hardness of QPQ treated samples is 3times more than the substrate,which is first increased and then decreased with increasing in nitriding temperature,and the optimum hardness is1164HV0.2at 120 min.The dry sliding results show that the wear resistance of QPQ treated samples reaches at least 20 times than that of the substrate,and the desirable wear resistance is presented at 120 min.The worn surface morphology observation reveals that the abrasion form of the substrate belongs to plough cutting,while the abrasion form of QPQ treated samples belongs to micro-cutting.关键词：QPQ Treatment;SAF2906Duplex Stainless Steel;Nitriding Time;Microstructure;Wear Resistance
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发布时间：2023-12-18 - 摘要：Based on the structure of cast copper cooling stave,two kinds of gating systems were designed,and the casting process was simulated by the ProCAST software in order to visualize the casting defects.And then,the process was optimized based on the simulated results,and the final casting process of cast copper cooling stave was determined.The trial production shows that the cast copper cooling stave can meet the requirement.关键词：Cast Copper Stave;Numerical Simulation;ProCAST;Process Optimization
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发布时间：2023-12-18 - 摘要：In digital management mode,as the carrier of enterprise’s casting process,the casting process card is often not comprehensive and detailed,which results in the mismatch between workshop production and casting process.Besides,the current casting process card can not form closed loop feedback with production process and quality information,so can not effectively control the cost of casting process.Aiming at the problems mentioned,a casting process card reference model based on digital technology was proposed.The casting process card reference model is composed of modeling,mould assembling,casting,blasting and so on,which covers mould process,operating route job,process BOM,process cost,quality require,feedback of production and quality test.The practical application reveals that the process card reference model can effectively guide workshop production,control casting quality well,form process BOM fast and accurately and better control process cost.关键词：Foundry Enterprises;Casting Process Card;Workshop Production;Casting Process Level
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发布时间：2023-12-18 - 摘要：<正>山西晋城泽州县南村镇位于晋城市区南郊,东与城区钟家庄乡接壤,西与李寨乡、川底乡为邻,北靠市区和城区西上庄乡,南临大箕、犁川、南岭三个乡镇。境内太焦铁路沿边而过,207国道穿越南北,晋阳、晋洛高速路横贯东西,是泽州县城的规划驻地和山西省通往中原大地的重要门户。辖下东常村是晋城第一个党组织的发源地,冶底村是晋城第一个"国家历史文化名村",晋普山"松林积雪"是晋城四大名景之一。全镇总面积88.6平方公里,其中中心镇区5平方公里,有38个行政村,49个自然村,耕地29 834
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发布时间：2023-12-18 - 摘要：<正>相关企业总量从700余家减至500余家,家庭作坊式企业已绝迹;年铸造设计能力达400多万吨,产量增加188%,产值增加227%,千余种产品远销30多个国家和地区……河北省泊头市遵循国家产业政策导向,力推铸造产业转型升级,实现了企业瘦身、产业提质增效。泊头铸造至今有1300年历史,铸件产量占全省三分之一。今年以来,泊头市转变发展思路,加快由资本消耗型增长向资本集约式增长转变,把铸造业提档升级作为富民强
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发布时间：2023-12-18 - 摘要：<正>2014年7月21日,永康市政府常务会议审议了《永康市铸造行业整治提升实施方案》。永康市现有铸造企业300余家。经前期调查摸底发现,不少企业存在生产规模小、生产设备落后、无环保处理设施、卫生防护距离不够等现象,对厂区附近环境污染比较严重。此次整治内容包括严控审批、关停取缔、改造升级等方式。整治目标包括对以铸造（铸铁、铸钢）为主的企业及有铸造生产环节的企业全面推行产业升级。对规模大的铸造企业通过整改提升,达到环保、卫生、安全、节能等相关要求;对规模较小的铸造企业,通过关停、转产、重组整合提升,解决环境污染重、资源消耗大、产品附加值低等问题。
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发布时间：2023-12-18 - 摘要：<正>郑州维达铸造材料有限公司（以下简称"维达铸造"）参加了由中国投资协会和河北省定州市人民政府共同主办的"京津冀区域经济发展论坛及项目投融资洽谈会",维达铸造公司在会议现场发布了新产品,引起了与会者的极大兴趣。据介绍,该公司创立于2009年,经过近五年的潜心发展,现已成为高性能铸造与炼钢用辅助材料、功能材料的创新与研发基地,形成了以精炼添加剂为核心产品,系列化环保型辅材为综合支撑的完整生产研发体系。
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发布时间：2023-12-18 - 摘要：Semi-solid 2024 aluminum alloy billets were prepared by conventional RAP route（recrystallization and remelting）,and a cap parts were produced with the semisolid billets by thixoforging.The inhomogeneity of microstructure and composition as well as processing parameters of billet prepared were analyzed.The results show that the microstructure solidified from liquid phase is relatively minor at the center of billet,and liquid phase deposition at the flange region is major,resulting in shrinkage defects and micro-cracks.The composition segregation exhibits serious increasingly near to the flange region,and the segregation can be reduced with in the crostructure with fine grains.关键词：2024 Aluminum Alloy;RAP Route;Thixoforging;Structure Inhomogeneity
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发布时间：2023-12-18 - 摘要：Using the slot gating system,with filling temperature of 590 ℃,mould preheating temperature of 200℃,injection speed of 5m/s,the filling and solidification process of A356 alloy electric field sensor shell were simulated by the ProCAST software to improve and optimize the gating system parameters.The results show that using semi-solid casting in form of the gate with castings tangential,gasentrapment and shrinkage porosity can be decreased to ensure mechanical performance consistency of the electric field sensor,and the overall quality of the electric field sensor is improved.Adopting the optimized parameters experiment,qualified electric field sensor was produced successfully.关键词：Semi-Solid Die Casting;Numerical Simulation;Gating System;Porosity Shrinkage
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发布时间：2023-12-18 - 摘要：Microstructure evolution and the quantitative relationship between theα-Mg grain size as well as shape factor and process parameters of both the semi-continuous cast and extruded AZ80 magnesium alloy were investigated after semi-solid isothermal treatment（SST）.The results show that,with a given parameters,theα-Mg grain size exhibits more spherical with more uniform distribution in the extruded AZ80 magnesium alloy after SST,and the liquid phase in theα-Mg grain is generated from intracrystalline partial melting priority due to solution elements enrichment and high energy reserves,while the semi-continuous casting AZ80 magnesium alloy,the liquid phase in theα-Mg grain is caused by liquid phase entering inside the grain due to the dendrite arms coalescing.After SST with different parameters for extruded AZ80 magnesium alloy,theα-Mg grain sizes follows Gauss distribution.At 570℃for 20 min,the distribution of solid and liquid phase is relatively homogeneous,and the shape factor ofα-Mg grain size mainly concentrates in high coefficient area with relatively high average shape factor value of0.86.关键词：AZ80Magnesium Alloy;Semi-solid State;Shape Factor;Quantitative Analysis;Microstructure
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发布时间：2023-12-18 - 摘要：The main problems existing in the design of carbon nanotubes（CNTs）reinforced magnesium matrix composites were presented such as the dispersed uniformity of CNTs in the magnesium matrix and effective interface bonding between the CNTs and magnesium matrix.The dispersed uniformity of CNTs,selection of preparation method and process,interface bonding between CNTs and magnesium matrix were analyzed to explore the effective method for solving the problems mentioned.Finally,the development trend of the design of CNTs reinforced magnesium matrix composites was surveyed.关键词：Carbon Nanotubes;Magnesium Matrix Composites;Design;Dispersion;Interface
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发布时间：2023-12-18 - 摘要：Luk die casting housing used for special conditions taken high scrap rate and difficult product due to clamping forces of static container more than far away the moving container in die casting die design.So the die casting die was modified.Advanced preset pull rod for pressure rod was assembled on the mould to improve the deformation of the housing and reduce the housing soldering with the static container.In addition,drawing core mechanism for the static container was added and pendulum hinge was set between moving container and middle plate to eliminate the maximum clamping force from the static container,which taken release smoothly and eliminated the deformed scraps.关键词：Housing;Die Castings;Mould
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发布时间：2023-12-18 - 摘要：Based on CAE,solidification and filling process of aluminum alloy high-voltage switch housing were simulated.Through the analysis of temperature field and casting defects in the aluminum alloy housing during the solidification process,process was optimized.The results show that the aluminum metal alloy housing can eliminate the shrinkage porosity（holes）through adding feeding channel in the sand core for partial thick-wall position to realize the sequential solidification.关键词：High Voltage Switchgear;Aluminum Alloy Housing;Numerical Simulation;Processing Design
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发布时间：2023-12-18 - 摘要：Through hardness testing,metallographic microscope analysis,and other means,the origination of crack failure in the die casting die for aluminum alloy was analyzed.The results reveal that the crack failure of the mould is mainly attributed to the electrical discharge machining,the improper heat treatment process and the impact of liquid metal.Through the optimization of the heat treatment process,such as multi-staged heating at 480,700 and 850℃ +vacuum oild quenching at 1 050℃ +seconding tempering at 600℃,and proper preheating mould as well as annealing treatment to reduce design hardness to 4647（HRC）,the service life of die is improved greatly.关键词：Die Casting Die for Aluminum Alloy;Failure;Heat Treatment Process;Service Life
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发布时间：2023-12-18 - 摘要：With the rapid development of technologies of mechanical automation,automatic units are widely used for pressure die casting.However,the production management capacity for the machine needs to be improved.The most efficient way is to develop remote monitor system for the die casting units.Combined with information management requirement,the development and application of remote monitor system was introduced,including communication mode between die casting machine and ancillary equipment,remote monitor system design proposal,software implementation and the application estimation.Remote monitor terminal can communicate with the device based on industrial Ethernet and OPC technology.The result indicates that the system can find the substandard products caused by unstable injection.关键词：OPC;Industrial Ethernet;Die Casting Unit;Remote Monitor
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发布时间：2023-12-18 - 摘要：Aiming at die casting workstation using multi manipulator to improve the problems in production operating rate,production cycle and reasonable use of the production line layout to complete the die casting process at the domestic and foreign,a method of off-line programming of a full automatic die casting production system was developed.Based on the RobotStudio platform,a full automatic die casting production system workstation was established including development and production of system program,simulation robot,die casting machine,hydraulic machine automatic production process,the production system of off-line programming can be realized.The results show that the system can improve the flexibility of production,production efficiency and reproducibility,improving the utilization rate of equipment,and greatly shortening the production preparation time for equipment.关键词：Die Casting Process;Off-line Programming;Industrial Robot;Automation
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发布时间：2023-12-18 - 摘要：Magnesium alloy was treated by compound Ca alloying addition and Nd modification,and then it was formed by squeezing casting at 100 MPa to understand effects of Nd on microstructure and mechanical properties of the alloy by XRD（X-ray diffraction）and EDS.The results reveal that grain size in the squeezing casting alloy is refined,and dislocation is easily generated with the uniform fine precipitation phase,greatly improving the mechanical properties of the alloy.With 0.4% Nd addition,the mechanical properties of the alloy exhibit desirable,where tensile strength,yield strength and elongation reach 230 MPa,121MPa and 4.8%,respectively,increased by 28%,61%and 78%,respectively.关键词：Magnesium Alloy;Squeezing Casting;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：<正>中国重型机械工业协会大型铸锻件分会会员大会、全国大型铸锻件标准化技术委员会第一届四次全体委员会暨两项国家标准审查会,在青海省西宁市召开。来自全国的78位代表出席了会议。大型铸锻件分会第五届理事会理事长、二重集团公司董事长、总经理杨建辉在会上作了工作报告,总结了分会第五届理事会四年来的工作。会议对《大型合金结构钢锻件技术条件》和《大型碳素结构钢锻件技术条件》两项国家标
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发布时间：2023-12-18 - 摘要：<正>由中国铸造协会主办的"中国国际压铸工业展览会"是具有17年历史的"国际有色合金及特种铸造展览会"的专业细分升级品牌。在沿革"国际有色合金及特种铸造展览会"铸件品种齐全,特种铸造装备性能精良传统的同时,深入进行专业细分,将专注于压铸领域,集中展示各类压铸件、压铸机及压铸新工艺、新技术。本届"中国国际压铸工业展览会"展览总面积11 000m2,设有200余个不同类型的展位,预计专业观众将超过6万人次,展会时间:2015年3月31日4月3日,地点:国家会展中心（上海）F1馆。
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发布时间：2023-12-18 - 摘要：<正>2014年8月78日,由中国机械制造工艺协会、中国机械工程学会铸造分会铸铁及熔炼技术委员会主办,玉柴等单位承办的第九届全国铸铁及熔炼学术会议暨机床铸铁件技术研讨会在玉林召开。作为我国铸造学术界和企业界的盛会,此次研讨会吸引了来自海内外铸造及相关行业的140余家单位共200多人参加。研讨会围绕"提高铸铁件质量及其稳定性,扩大铸铁应用范围"这一主题进行探讨。会上,郑州机械研究所铸造工
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发布时间：2023-12-18 - 摘要：Effects of electromagnetic stirring on equiaxial crystal ratio in 430 ferritic stainless steel、409L ferritic stainless steel and 2205 duplex stainless steel slab were analyzed under industry test.The results show that the equiaxial crystal ratios in slabs with electromagnetic stirring are obviously increased compared with no-EMS,and the equiaxial crystal ratios in slabs are all different,which is related to the characteristics of stainless steel grade.关键词：430 Ferritic Stainless Steel;409 LFerritic Stainless Steel;2205 Duplex Stainless Steel;Electromagnetic Stirring;Equiaxial Crystal Ratios
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发布时间：2023-12-18 - 摘要：In order to improve the strength of silicon sol shell for investment casting process,glass fiber was mixed into the slurries to prepare the sol silicate shell samples.The properties such as bending strength of green shell,fired strength and self-loaded deformation at elevated temperature were investigated,and the fracture surface of shell samples were observed by SEM（scanning electron microscopy）.The results show that the green strength of shell specimens with glass fibers is increased,and the selfloaded deformation at elevated temperature is firstly increased and then decreased.The shell specimen reinforced with 0.6%fibers addition reaches the highest green strength of 4.61 MPa,and the self-loaded deformation at elevated temperature has a decrease of about 24% with the 1.0%fiber addition.The fired strength of shell sample with the concent of 0.2%1.0%glass fiber is increased more than 12%.It is found by SEM that the failure of the fiber-reinforced shell specimens at the applied load is attributed to breakdown of silicon sol films and pulling-out and debonding of fibers in the shell.关键词：Glass Fiber;Fiber-Reinforced Shell;Investment Casting;Strength
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发布时间：2023-12-18 - 摘要：Taken full mold casting stamping die as samples,the basic procedure and key caution of bimetal casting process were described.Foamed pattern adopted EPS materials with 17kg/m3 in density with conventional graphite water-based coating and cold cured furan resin sand mould.Open gating system was designed,where the first package liquid iron（HT300with Cr and Mo）was poured into the mould at 1 360℃,and the second package liquid iron（HT300）was poured into the mould ahead of 23scompleting the first package pouring with 2times of the first package weight.The results show that the size,appearance and color of the castings produced meet the quality requirement.After heat treatment,the hardness of the bottom and upper working surface reaches 195（HBS）and 170（HBS）,and tensile strength is more than 300 MPa.关键词：Full Mold Casting Process;Bimetal;Technological Design
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发布时间：2023-12-18 - 摘要：The continuous casting for bismuth-bearing zinc-copper-nickel alloy substituted for lead-bearing zinc-copper-nickel alloy was conducted because of the toxicity of the lead element.Experimental results reveal that in the tradintional way,the coarse grains can be observed with radiation growth along heattransferring direction,resulting in the the poor plasticity.After improvements,compulsive heating and cooling equipments were installed at the exit of horizontal continuous casting furnace,and the growth of grain crystal in axial direction was promoted and grain size was refined.The elongation rate of bismuthbearing zinc-copper-nickel alloy continuous casting rod is increased more than 20%,after annealing and cutting detection,it could completely replace lead-bearing zinc-copper-nickel alloy.关键词：Bi-Zn-Cu-Ni Alloy;Unleaded Copper Nickel Alloy;Continuous Casting
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发布时间：2023-12-18 - 摘要：The distribution of TiH2 particles foamed agent in the liquid aluminum alloy is related closely with the structure and properties of foamed aluminum.Dispersed behavior of TiH2 particles in the molten aluminum was simulated by the Fluent,especially effects of stirring blade parameters and stirring speed.The results show that dispersed uniformity of TiH2 particles is affected by radial and axial flow of molten aluminum,and it is related with stirring blade parameters and stirring speed.With 3layers of stirring blades with 30 cm in length,inclined angle of 30°and stirring velocity of 50r/s,distributed uniformity of TiH2 particles in molten aluminum exhibits desirable.关键词：Foamed Aluminum;Foaming Angent TiH2;Dispersed Behavior;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Effects of different RE addition and solid solution treatment on microstructure and tensile properties of as-cast and as-solution ZL301 alloy were investigated.The results indicate that tensile strength and elongation of the as-cast alloy can be improved with mixture RE addition,which are attributed to grain refinement and creation of Al-RE discontinuously distributed along grain boundary to strengthen grain boundary.The mechanical properties of ZL301 alloy exhibits desirable with 0.5% RE addition and solution treatment at 435℃for 16 h.With mixture RE addition more than 0.5%,the tensile strength and elongation of the alloy are deteriorated as a result of Al-RE phase continuously distributed along grain boundary decreasing bonding strength of grain boundary.关键词：Mixture Rare Earth;ZL301 Alloy;Microstracture;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Hot compression test of the Al-Zn-Mg-Cu alloy with Zr addition was carried out on the Gleeble-1500 thermal simulation machine at 300450℃and the strain rates of 0.000 51.000s-1.The microstructure of the alloy under different deformation conditions was observed using optical microscopy（OM）,electron back scattered diffraction（EBSD）and transmission electron microscopy（TEM）.The results show that the dislocation density is decreased and the subgrain size is increased with increasing in deformation temperatures or decreasing in strain rates,leading to the decrease of peak stress.Under the given thermal deformation conditions,the microstructure is mainly controlled by low angle boundaries,and the main softening mechanism is characterized by dynamic recovery.Amounts of Al3 Zr particles with the size of 1025nm are generated after adding minor Zr in Al-Zn-Mg-Cu alloy,which can pin dislocations and subgrain boundaries to inhibit recrystallization during deformation,which are responsible for the alloy keeping dynamic recovery microstructure under the given hot deformation conditions.关键词：Al-Zn-Mg-Cu Aluminum Alloy;Hot Compression Deformation;Dynamic Softening
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发布时间：2023-12-18 - 摘要：Effects of grain refiner on microstructure and mechanical properties of the Al-Mg-Zr alloy were investigated by adding trace Sc or Ti elements and compound adding Ti and Sc.The results show that the addition of 0.15%Ti can positively refine microstructure of the alloy and improve mechanical properties obviously.And the combined addition of 0.2%Sc and 0.15%Ti exhibits the desirable grain refining effect,where average grain size of the alloy is refined to only about 43μm,and the strength and elongation are improved by about 70%and 16.4%,respectively,which is largely attributed to the formation of Al3 Ti,Al3Sc,Al3（Ti,Zr）,Al3（Sc,Zr）and Al3（Sc,Ti）particles commonly to act as heterogeneous nuclei and to promote the grain refinement.关键词：Al-Mg-Zr Alloy;Microstructure;Mechanical Properties;Nucleation Sites
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发布时间：2023-12-18 - 摘要：Influences of different Ce content on microstructure and mechanical properties of ZL107 alloy were investigation by scanning electron microscopy（SEM）,tensile testing,wear resistance testing and corrosion resistance testing.The results show that morphology of eutectic Si in the ZL107 alloy is transformed from needle-flake shape to short bar shape with uniform distribution after modification,and the grains size is refined.The properties of ZL107 alloy with Ce modification are improved remarkably.The tensile strength and elongation of the alloy with 0.3% Ce modification reach up to 198.7 MPa and3.7%,respectively,and the wear resistance and corrosion resistance are increased by 61% and by70.8%,respectively.However,modification effect become worse with further Ce addition,decreasing the properties of the alloy.关键词：Modification;Al-Si Alloy;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The corrosion inhibition of AZ91 Dmagnesium alloy in 1g/L NaCl solution with sodium fluoride was detected by weightless,Tafel polarization curves,electrochemical impedance spectroscopy（E IS）and scanning electron microscopy（SEM）.With adding sodium fluoride into salt solution,protective coating MgF2 is formed on AZ91 Dsurface,which prevents Cl-adsorption on the interface between the sample and corrosive medium,therefore inhibiting the corrosion.With the concentration of sodium fluoride from 1g/L to 3g/L,the inhibition efficiency is increased,and the depth and quantity of pits become shallow and less with the corrosion potential moving positively and the capacitive loop of electrochemical impedance spectroscopy increases.Sodium fluoride is the corrosion inhibition of anode inhibited type.The inhibition efficiency is more than 50%and the highest value reaches 85%in 1g/L NaCl with NaF for 168 h.关键词：Magnesium Alloy;Sodium Fluoride;Corrosion;Inhibition
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发布时间：2023-12-18 - 摘要：Double gradient porous HA/Mg composites where both porosity and HA exhibited gradient distribution were prepared by powder metallurgy method.Effects of the content and distribution of the pore former and HA on the porosity and compressive strength of the composites were analyzed.The microstructure of the sintered composites was observed,and corrosion resistance of the composites was examined.The results show that with the increase of the pore former in the inner layer of double gradient porous Mg/HA materials,the porosity of the composites is increased and compressive strength is decreased.With the increase of the HA content in the outer layer of double gradient porous HA/Mg composites,the compressive strength of the composites is decreased and the porosity of the composites is increased.The corrosion resistance measurement shows that with the increase of the porosity,the corrosion resistance of the composites is weaken.Double gradient porous HA/Mg composites is superior to gradient porous Mg material in corrosion resistance.With the increase of HA content in the outer layer of the composites,the corrosion rate of the composites is decreased and pH of solution is increased slowly.关键词：HA/Mg Composites;Gradient Porosity;Gradient HA Phase;Compressive Strength
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发布时间：2023-12-18 - 摘要：In order to improve the forming quality and production efficiency of superplastic forming Zn-5Al alloy drum winder,the super plastic forming process was analyzed.Based on principle of superplastic gas forming,basic principle of the parameters of superselective plastic forming process for aluminum alloy drum were presented according to the structure and technical features.Calculation method of the forming die design were given,and the key points of design and the use of die forming were described.The results show that tube blank by superplastic forming exhibits the features of precision shape with Ra≤6.3,which can be directly carried out polishing to meet the process requirements.Meanwhile,cost was reduced and the production cycle was shorten.关键词：Winder Slotted Drum;Zn-5Al Alloy;Superplastic Forming;Process Parameters;Die Design
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发布时间：2023-12-18 - 摘要：The wear testing of Cu-Ag alloy for Cu cladding Al composite contact wire with the 45#steel and bronze alloy as friction pair was conducted,and the wear surface morphology of the sample at different loads and sliding speeds was observed.The results show that the main mechanisms of Cu-Ag alloy sliding wear are abrasive wear and adhesive wear.With the 45 # steel as friction pair,there exist a large amount of plastic deformation on the wear surface,and obvious furrows and cutting traces in the sliding direction occur,meanwhile,copper oxide in the wear surface is generated,which plays not only the abrasive in the process of wear but also lubrication role.With the bronze alloy as friction pair,the wear surface has serious peeling pit and adhesion,and the wear rate of bronze alloy friction pair is obviously more than steel friction pair.关键词：Cu Cladding Al Contact Wire;Cu-Ag Alloy;Sliding Wear
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发布时间：2023-12-18 - 摘要：Grain size and mechanical properties of H62 brass without treatment,with pulsed magnetic field treatment,mechanical vibration treatment and compound treatment of pulsed magnetic field and mechanical vibration were investigated comparatively by using optical microscope,tensile testing machine and scanning electron microscope.In addition,influences of pulse voltage,pulse frequency and mold temperature on grain size and mechanical properties of the alloy with compound treatment were investigated.The results show that the compound treatment of pulsed magnetic field and mechanical vibration can not only refine the grains,but also improve the mechanical properties of H62 brass,which is more efficient than pulsed magnetic field treatment or mechanical vibration treatment.Tensile strength and elongation of the alloy with compound treatment are increased by up to 9.7%and 14.6%,respectively.With the increase of the pulsed voltage or pulsed frequency,grain size of the alloy is refined,and mechanical properties are improved gradually.关键词：Pulsed Magnetic Field;Mechanical Vibration;Compound Treatment;Grain Size
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发布时间：2023-12-18 - 摘要：Microstructure and properties of nickel-aluminum bronze before and after heat treatment were investigated by using SEM,OM,XRD and mechanical property testing.The results show that the microstructure of as,cast nickel aluminum bronze is composed ofαphase andκphase,and increasing the solution temperature from 850℃to 1 000℃for 2h,the hardness of the alloy is increased firstly and then decreased.Meanwhile,theαphase andκphase are reduced and the martensiteβ′phase is generated.Aging hardening exhibits obvious with aging temperature from 300 to 700℃after solution at 900℃for 2h,where the hardness reaches the peak with aging for 1h,and the phenomenon of aging hardening disappears with aging temperature more than 500℃.关键词：Nickel-Aluminum Bronze;Heat Treatment;Microstructure;Property
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发布时间：2023-12-18 - 摘要：A new type of tooling was designed including mosaic cavity,modular abutment,the cooled abutment and the cooled extrusion wheel for copper working,which could save copper materials and cost,and improve the service life and efficiency of the tool.关键词：Tooling Design;Continuous Conforming;Copper Materials
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发布时间：2023-12-18
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