最新刊期
卷 31 ， 期 5 ， 2011
- 摘要：The Al-5Ti-1B master alloy was produced by electromagnetic stirring and castex process.Microstructure and grain refinement efficiency of Al-5Ti-1B master alloy were investigated by ICP,OM（optical microscope）,XRD（X-ray diffraction） and SEM（scanning electron microscope）,and compared with that of Al-5Ti-1B alloy ingot.The results show that TiAl3 phase is refined and distribution of TiB2 particle is improved in the Al-5Ti-1B master alloy as a result of effects of electromagnetic stirring in tundish and semi-solid shearing effects as well as severe plastic deformation role during castex process,where TiAl3 phase exhibits fine block structure and TiB2 particle is dispersed into α-Al matrix.Grain refining effects on the aluminum alloy with the prepared master alloy are greatly improved.The average grain size in the pure aluminum with 0.2% Al-5Ti-1B master alloy reaches 223 μm with holding for 5 min and 316 μm with holding for 180 min.关键词：Al-5Ti-1B Master Alloy;Electromagnetic Stirring;Castex Process;Semi-solid Stirring;Severe Plastic Deformation
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发布时间：2023-12-18 - 摘要：ECAP process of 6061 aluminum alloy was simulated by the Deform-3D software to understand effects of friction on ECAP process and to describe the change of squeezing force and distribution of strain and stress.ECAP process was conducted on 1000kN extruding machine,and effects of different lubricants on friction were observed by measuring practical extruding loading.The results show that strain and stress exhibit uneven distribution during ECAP process,and with increasing in frictional coefficient and extruding forces,uneven degree of deformation is increased.In addition,simulated results are well in agreement with experimental ones.关键词：6061 Aluminum Alloy;ECAP;Deform-3D;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Due to the defects such as high oxygen content and more inclusions in the high Ti ferroalloy prepared by the aluminum thermal reduction,the vacuum reduction refining was used to prepare the high Ti ferroalloy with low oxygen based on the high Ti ferroalloy prepared by aluminum thermal method as raw materials.Effects of the refining temperature and refining slag on refining efficiency were investigated,and the high Ti ferroalloy with low oxygen content was characterized by XRD（X-ray diffraction）,SEM（scanning electron microscope） and chemical elemental analysis.The results show that it is necessary to ensure the refining effects with proper refining slag and the higher refining temperature.The reduction refining alloy exhibits uniform and compact structure,and oxygen content in the alloy is dramatically decreased as a result of the apparent elimination of inclusion.High Ti ferroalloy prepared with CaO-Al2O3 as refining slag at 2 000 ℃ is composed of 69.8% Ti,22.55% Fe,2.58%Al,2.02% Si and 2.60% O,meeting the technological requirements of the high quality high Ti ferroalloy.关键词：High Ti Ferroalloy with Low Oxygen;Vacuum Reduction Refining;SEM（Scanning Electron Microscope）;Refining Slag
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发布时间：2023-12-18 - 摘要：<正>西部矿业为进一步扩大公司在有色金属行业的产业规模,拟在青海省西宁市投资建设10万吨铜冶炼项目。公告显示,该项目估算投资为22.80亿元(含
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发布时间：2023-12-18 - 摘要：<正>环境保护部提出的《重金属污染综合防治"十二五"规划》已被国务院正式批复。规划要求,到015年,重点区域铅、汞、铬、镉、类金属砷等重金
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发布时间：2023-12-18 - 摘要：<正>由一汽集团铸造有限公司铸模厂主持,清华大学、西安交通大学、机械科学研究总院先进制造技术研究中心等单位联合承担的国家科技重大专项——"35000kN吨精密卧式实时控制压铸机及成套装备"项目日前正式启动。
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发布时间：2023-12-18 - 摘要：<正>华南地区最具影响力的压铸与铸造行业展览会之一,由香港压铸及铸造业总会和广东省铸造行业协会主办的"2011国际（深圳）铸业展"将于5月25日-27日在深圳会展中心举行。力劲集团将携最新科技成果伺服节能两板式冷室压铸机,以及压铸后加工CNC加工中心参加本届展会。这将是国内两板式压铸机首次亮相行业展会。
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发布时间：2023-12-18 - 摘要：<正>国际模具及五金塑胶产业供应商协会钢材专业委员会专家顾问李光超表示,目前国产模具钢材高质量的比较少,相当部分要求高的模具钢都需要
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发布时间：2023-12-18 - 摘要：<正>中国铸造协会4月1日发出通知,正式在全国范围内开展铸造工程师资格认证工作。现将相关事项报道如下。一、考试时间2011年全国铸造工程师资格考试安排在2011年11月5日于清华大学进行。
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发布时间：2023-12-18 - 摘要：<正>一、目的①为日益增多的国内外采购商到广东采购铸件提供指南。②提供企业及产品的最新信息,以利于行业间的相互交流。③在国内外相关大型专业会议上派送,宣传广东企业成就。
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发布时间：2023-12-18 - 摘要：Effects of different Cu and Mo contents on microstructure and mechanical properties of horizontal continuous cast ductile iron profiles with 60 mm in diameters were investigated.The results reveal that,with adding Cu and Mo elements,cast ductile iron profiles with pearlite or astenite-bainite structure can be obtained.At a fixed Mo addition,austenite-bainite structure in the cast ductile iron profiles is controlled by Cu content.Tensile strength,yield strength and hardness of the alloy are greatly improved with Cu and Mo addition,however,impacting toughness is slightly decreased.关键词：Horizontal Continuous Casting;Cast Ductile Iron Profiles;Austenite-Bainite Structure
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发布时间：2023-12-18 - 摘要：V-5Cr-5Ti alloy was prepared by double vacuum arc remelting（VAR） and then forging as well as warm rolling and annealing treatment to realize desirable chemical composition and mechanical properties,and properties and microstructure of the prepared alloy were characterized by chemical analysis,OM（optical microscope）,SEM（scanning electron microscope） and tensile testing.The results show that oxygen content in the alloy can be controlled in 500600 μg/g after double arc remelting,however,grain exhibits coarse in the ingot.Fine equiaxed grain with size lower than 100 μm can be observed in the prepared alloy with forging at 1 150 ℃ and warm rolling at 450 ℃ and then annealing at 1000 ℃ for one hour,and yield strength,tensile strength,elongation and area reduction reach 356 MPa,449 MPa,31.5% and 71.5%,respectively.关键词：V-5Cr-5Ti Alloy;Arc Remelting;Rolling;Microstructure
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发布时间：2023-12-18 - 摘要：Effects of isothermal-quenching treatment with different temperatures and time on microstructure and mechanical properties of pull-up vertical continuous casting QT500-7 ductile iron hollow parts were investigated.Compared with that produced by conventional sand casting,the ductile iron casting exhibits the higher nodularity and better homogeneity.Tensile strength and impact toughness of the ductile iron are increased significantly after different isothermal-quenching treatments,which is very suitable for producing motor engine cylinder sleeves and piston rings as well as the other hollow cast iron parts.关键词：Continuous Casting;Nodularity;Isothermal-quenched Treatment;Bainite;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Microstructures of ZTC4 Ti alloy casting sheets before and after welding repairs were analyzed,and effects of welding repairs on tensile,bending strength and impacting properties of the alloy sheets were investigated.The results show that initial microstructure of the alloy sheets is changed with the welding repairs.Acicular α’ martensite can be observed in the welding zone and heat-affected zone after welding repairs.Although change of tensile strength and bending strength of the alloy sheets can be ignored,elongation and impacting toughness after welding repairs are greatly decreased by 35% and 30%,respectively.关键词：Casting Ti Alloy;Welding Repairs;Microstructure;Properties
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发布时间：2023-12-18 - 摘要：Microstructure evolution of Sr modified Al-13Si-0.4Mg alloy during solidification process was observed by quenching and OM（optical microscope） to understand the un-uniformity of eutectic structure in the alloy.The results show that,during the initial stage of eutectic reaction,coarse eutectic structure is created in the alloy as a result of low branches in formed eutectic colony,characterized by thick eutectic Si flakes with wide lamellar spacing and a few branches.With advancing in reaction,eutectic grain is gradually refined due to the increase of branches in eutectic colony,characterized by thin eutectic Si flakes with narrow lamellar spacing and a lot of branches.Different enrichment of Sb at eutectic solid-liquid solidification front results in the different absorption coefficient of Sb on surface of eutectic Si,affecting the growth velocity of eutectic Si,which is responsible for the un-uniformity of structure in the alloy.关键词：Al-Si Alloy;Microstructure Un-uniformity;Sb;Modification
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发布时间：2023-12-18 - 摘要：<正>日本地震及海啸使国内部分制造业临时性停产,导致精铜42万吨、精锌43.5万吨的产能暂时关闭。由于能源供应短缺,东邦锌业公司年产能11.5
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发布时间：2023-12-18 - 摘要：<正>智利某铜矿产商估计,2011年全球精炼铜市场供需缺口将达到44万吨。该公司称,未来数年,供应面压力仍将增加。
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发布时间：2023-12-18 - 摘要：Filling and solidification process of die casting semi-solid A356 aluminum alloy under-shell were simulated by the ProCAST software.The results show that,with preheating mould at 220℃ and filling at 590 ℃ as well as filling at 5m/s,semi-solid slurry exhibits smooth filling behavior with uniform temperature field distribution,effectively eliminating shrinkage hole（porosity）,which provides a reference to the design and optimization of die casting semi-solid A356 aluminum alloy parts.Qualified under-shell was produced by using the optimized processing parameters.Experimental results are well in agreement with the simulated ones.关键词：Semi-Solid Die Casting;Numerical Simulation;Deformation Temperature;Filling Velocity;Shrinkage Hole（Porosity）
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发布时间：2023-12-18 - 摘要：Effects of melt processing temperature on AZ61 magnesium alloy slurry prepared by self-inoculation method were investigated by OM（optical microscope） and SEM（scanning electron microscope）.The results reveal that near spherical grain can be observed in AZ61 magnesium alloy slurry prepared by self-inoculation method with forming at below liquidus temperature.Average grain size in the slurry reaches 39.8 μm with melting processing temperature of 700 ℃.With the lower melt processing temperature,dendritic grain in the microstructure is decreased and fine near spherical grain is increased with heterogeneous distribution in size,while with higher temperature,dendrite grain in the microstructure is increased with obvious growth of average grain size.关键词：Melt Processing Temperature;Self-inoculation;AZ61 Magnesium Alloy;Semi-solid
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发布时间：2023-12-18 - 摘要：Through the reheating A356 cilinder-shaped billet with the multi-station rotating electromagnetic induction equipment,variation of aluminum alloy structure from room temperature to semi-solid temperature was described.With different heating powers and heating stations,different non-dendritic structures in the semi-solid aluminum alloy billets were observed.Microstructure of the prepared billets was investigated by grain parameters including grain average size,shape coefficient and solid fraction.Optimized processing parameters were presented.Reheating billets based on optimized parameters were cut into multi-step samples to conduct thixo-forming die casting.Rationality and superiority of the process can be verified by analyzing the performance of multi-step samples.Based on solidification theory,evolution characteristics of the billet during reheating process were expounded.关键词：Semi-solid;Thixo-forming;Reheating;Grain Parameters
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发布时间：2023-12-18 - 摘要：Difference of positive and radial pressure in internal solidification structure in single axial squeezing castings was analyzed,and there exists uneven pressure along axial direction for positive pressure.Pressure difference results in the change of interfacial heat transfer coefficient,melt temperature gradient of solidification front and grain growth rate as well as plastic deformation,which are responsible for the defects,such as heterogeneous solidification structure and density in single axial squeezing castings.Multi-direction squeezing method was presented to realize the requirements of homogeneous structure and desirable properties as well as high density of squeezing castings.关键词：Single Axial Squeezing Casting;Microstructure;Anisotropy;Multi-direction Squeezing
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发布时间：2023-12-18 - 摘要：Gas hole in the die castings was formed from residual gas in the castings.Although conventional vacuum method can effectively exhaust a part of gas in mould cavity,it can not meet technological requirements.Using high pressure vacuum method,gas in the mould cavity can be exhausted rapidly.Meanwhile,gas is isolated from the cavity by punch advance.And then,the liquid metal is driven by high velocity in cavity to solidification,realizing the total exhaustion and elimination of gas hole in the castings.关键词：Die Castings;Aluminum Alloy;Gas Hole;Cavity;Vacuum;Injection
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发布时间：2023-12-18 - 摘要：ZL114A plate castings with 10 mm and 25 mm in thickness were produced by low pressure casting.Filling and solidification features of the low pressure casting plates were investigated by measuring temperature field.The results show that plate castings with 25 mm in thickness are subjected to sequential solidification with a large temperature gradient from riser tube to plate end.Pressure can be exerted on the whole feeding process during solidification through riser tube.For plate castings with 10 mm in thickness,whole plate castings tend to mushy solidification due to rapid solidification velocity,and the feeding is mainly conducted at local position.The filling rate of 40 mm/s can meet the requirements of smooth laminar molten flow for both 10 mm and 25 mm thick plate castings.关键词：Low Pressure Casting;Temperature Field;Filling Process;Solidification Process
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发布时间：2023-12-18 - 摘要：Roles of different elements in austenitic stainless steel were described.CrE/NiE equivalent was calculated by the empirical formula.Ferritic content in the austenitic stainless steel was estimated by the CrE/NiE relation diagram.Magnetic permeability of the castings was measured with magnetic permeability instrument.Nonlinear relationship between CrE/NiE,ferritic content and magnetic permeability was verified.关键词：Chromium Nickel Equivalent;Ferrite;Relative Magnetic Permeability
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发布时间：2023-12-18 - 摘要：A new mould was designed by adding outlet numbers on upper surface,which made asymmetry outlet at upper and bottom surface.The mould not only decreased cooling intensity of bottom surface of the billet,but also improved the crystallized middle line to homogenize constituent in the billets as a result of overcoming gravidity of liquid copper to make bottom surface crystallization ahead.Furthermore,the design could increase service life of the graphite plate on bottom surface by decreasing pressure of liquid copper on solidified skull at bottom surface to decrease dummy drag force.Defects in the billets were decreased as a result of low temperature gradient between upper and bottom surface,improving the yield of strip.关键词：Mould;Yield;Bronze
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发布时间：2023-12-18 - 摘要：Problems in SCR furnace zone system and oxygen content in the copper materials were introduced.Through analyzing the design process,equipment,quality and cost,equipment was innovated to improve the efficiency of the production line.By adopting a series of measures,oxygen content in the copper alloy was obviously decreased.关键词：SCR Furnace Zone;Copper Rod;Oxygen Content Control
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发布时间：2023-12-18 - 摘要：Copper cladding aluminum rod with 8 mm in inner diameter and 2 mm in copper layer thickness were successfully made on the self-designed equipment for copper cladding aluminum continuous casting with air pressure.Composite rods exhibit good surface quality and stable continuous casting process.SEM（scanning electron microscope） observation and shearing strength testing were conducted.The results show that copper cladding aluminum rod has uniform thickness,and copper-aluminum interface in the inner exhibits diffusion interface with some thickness,realizing effective bonding of inner and outer metal.Copper cladding aluminum wire with 0.95 mm in diameter is made through the subsequent drawing process.And the wire exhibits good performance in mechanical properties and electrical performance.关键词：Continuous Casting;Continuous Casting with Air Pressure;Copper Cladding Aluminum;Wire
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发布时间：2023-12-18 -
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Numerical Simulation of LFC（Lost Foam Casting） Bead-filling Process with Different Numbers of Outlet
摘要：The Euler-Lagrange equation for LFC bead filling process was established,and flow dynamical behavior of dense gas-solid phase fluid during foam bead filling process in LFC（lost foam casting） was simulated by numerical simulation method.Movement of foam bead is closely related to the distribution of gas pressure.Pressure difference between inner and outer of the cavity at around outlets during foam bead filling process provides the driven force.At the other given conditions,filling process of three kinds of exhausting conditions was simulated.The simulated results reveal that filling process exhibits the most duration time at un-smoothly exhaustion,easily resulting in the non-dense filling behavior at high pressure zone in the cavity.关键词：LFC;Filling Process;Outlets;Numerical Simulation- 2
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发布时间：2023-12-18 - 摘要：Zirconia films were prepared by micro-arc oxidation（MAO） at the applied voltages of 450V in an aqueous solution containing Ca and P.The tribological behaviors of the films were mainly investigated by using ball-on-disc reciprocating friction and wear testing in 25% calf bovine synovia luburication.The results show that MAO zirconia films containing Ca and P are mainly composed of cubic zirconia,tetragonal zirconia and monoclinal zirconia,and the surface of the films exhibits porous structure with a few micro-cracks.Frictional coefficient of MAO films sliding against Si3N4 ceramic ball is lower than that of the untreated Zr-4 alloy,which is attributed to the higher hardness of the films and the less contact area between friction pairs and the micro-pore good for wet lubrication stored a lot of calf bovine synovia.Wear volume of the MAO samples is decreased obviously compared with that of the un-treated Zr-4 alloy,which is the result of higher hardness of the MAO film.The main wear mechanism of Zr-4 alloy is characterized by micro-cutting,while that of the MAO treated Zr-4 alloy is characterized by both fatigue peeling and micro-cutting.关键词：Zr-4 Alloy;Micro-arc Oxidation;Friction and Wear
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发布时间：2023-12-18 - 摘要：The carbon fibers were coated nickel by palladium-free activated electroless coating method and characterized by the field emission-scanning electron microscope（FE-SEM）.Chopped carbon fibers reinforced magnesium alloy composites were prepared by powder metallurgy combining with hot extrusion,and fiber distribution in the composites was evaluated by the super depth digital microscope.Effects of carbon fiber content in range of 04% on microstructure and properties of the composites were investigated.The results show that nickel-coated carbon fiber is uniformly distributed in the composites.Composites containing 4% carbon fiber and 3% aluminum prepared by pressing with 420 MPa and sintering at 550 ℃ for 0.5 hours,and then hot extruding with 280MPa at 480 ℃ can exhibit desirable mechanical properties.关键词：Carbon Fiber;Nickel Coating;Magnesium Matrix Composites;Powder Metallurgy;Hot Extrusion
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发布时间：2023-12-18 -
Effects of Mn Addition on Microstructure and Mechanical Properties of As-cast Mg-5Al Magneisum Alloy
摘要：Effects of Mn addition on the microstructure and mechanical properties of as-cast Mg-5Al magnesium alloy were investigated.The results show that with Mn addition,grain size in the alloy is refined,and continuous or semi-continuous net-like β-Mg17Al12 phase are converted into discontinuous and dispersedly skeleton one,meanwhile,particle phase is generated in the grain boundary with increasing in numbers.With increasing in Mn addition,ambient tensile strength,elongation and impact toughness of the alloy exhibit firstly increase and then decrease.When Mn addition reaches 0.3%,tensile strength,elongation and impact toughness reach 190 MPa,7.3% and 21.1 J·cm-2,increased by 7.9%,9.1% and 9.3%,respectively.With increasing Mn addition to 0.5%,comprehensive mechanical properties of the alloy are deteriorated as a result of aggregation and coarseness of Al8Mn5 particle.关键词：Mg-5Al Alloy;Mn;Microstructure;Mechanical Properties- 2
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发布时间：2023-12-18 - 摘要：Effects of Si-Ca alloy on microstructure of AM60 magnesium alloy were observed by OM（optical microscope） and SEM（scanning electron microscope）.The results indicate that with approximate Si-Ca alloy addition,grain size in the alloy is obviously refined,which is attributed to the generation of dispersedly distributed regular polygonal type Mg2Si phase,meanwhile,β-Mg17Al12 phase more easily form divorced eutectic structure with more dispersedly distribution.Effects of Si-Ca alloy on solidification of AM60 alloy were approached,and improvement mechanism of microstructure in the alloy was analyzed.关键词：AM60 Magnesium Alloy;Si-Ca Alloy;Microstructure;Solidification
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发布时间：2023-12-18 - 摘要：Effects of rare earth（RE） content and aging treatment on the corrosion behavior of Al-Mg-Si alloys for automotive body sheet were investigated.The results show that at given aging treatment,RE element can decrease corrosion rate and improve the corrosion resistance of the alloy,and optimum content of RE is 0.2%.However,RE can make the alloy to form solute depletion zone and grain boundary corrosion,aggravating the exfoliation corrosion of alloys.关键词：Automotive Sheet;RE Element;Corrosion Behavior
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发布时间：2023-12-18 - 摘要：Effects of RE element Gd on microstructure and mechanical properties of as-cast AZ31 magnesium alloy were investigated.The results reveal that microstructure of the as-cast AZ31 magnesium alloy can be refined with Gd addition,resulting in the decrease of Mg17Al12 phase and occurrence of particle or polygonal Al2Gd phase.With 0.8% Gd addition,average grain size of the alloy is refined from approximately 290 μm to 140 μm,and tensile strength and elongation are improved to 210 MPa and by 18.3%,respectively.关键词：AZ31 Magnesium Alloy;Gd;Grain Refinement;Microstructure
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发布时间：2023-12-18 - 摘要：ZA27 alloy ingot containing 0.2% or 0.5% Zr was prepared,and the prepared alloy was treated by solid solution at 370 ℃ for 12 hours and artificial aging at 100℃.The results show that 0.2% Zr can apparently modify the ZA27 alloy by transforming developed dendrite into fine rosette grain,however,0.5% Zr content can fade the modification effects as a result of generation of coarse rod-like Al3Zr phase.After solid solution treatment,supersaturated primary α’,phase is transformed into fine（α+η） phase in the alloy,meanwhile,a little CuZn5 phase is found in α grain boundary.α grain in the alloy with 0.2% Zr addition exhibits more uniformity and fine.In addition,Zr modification can significantly improve the peak hardness of the aged alloy,and postpone the corresponding aging time at 100 ℃.关键词：ZA27 Alloy;Zr Modification;Microstructure;Heat Treatment
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发布时间：2023-12-18 - 摘要：Isothermal compression of CuAlBe alloy with columnar grain was conducted with control-temperature mould on universal material tensile machine to understand effects of different deformation temperature,deformation rate and deformation degree on dynamic recrystallization behavior of the alloy.It is found that,at deformation rate of 5 mm/min,recrystallization temperature is decreased with increasing in deformation degree,however,with increasing deformation rate to 10 mm/min and 20 mm/min,it is independent of the deformation degree,keeping a constant value of 550 ℃.When deformation rate is increased to 40 mm/min with 35% deformation degree,recrystallization temperature is raised to 600 ℃.Furthermore,with increasing in deformation degree,recrystallization temperature is gradually decreased to 550 ℃.When deformation temperature is lower than 450℃,grain boundary crack occurs.关键词：CuAlBe Alloy;Columnar Grain;Dynamic Recrystallization;Isothermal Deformation
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发布时间：2023-12-18 - 摘要：Working principle and structure characteristics of furan resin A+B curing agent controller were introduced,and processing factors and noted items of the controller applied successfully in acidic hardening furan resin moulding line were described.Relationship of sand temperature with A,B pump and average total acidic rate of curing agent was presented.Curing agent controller from the Shengquan company was assembled on the moulding line.With reclaimed sand addition of 0.65%0.85% and A+B curing agent of 30%40%,effects of reclaimed sand temperature on curing velocity during self-hardening sand process were eliminated,ensuring the quality of casting mould and sand core,decreasing the product cost.关键词：Curing Agent Controller;Reclaimed Sand;Sand Temperature;Sand Properties
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发布时间：2023-12-18 - 摘要：<正>近年来国外公布了一些有色合金和特种铸造用涂料方面的专利,而国内这方面的资料相对较少。为了促进我国特铸技术的发展,将国外有关特铸涂料专利技术,摘要编译如下,以供参考。
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发布时间：2023-12-18 - 摘要：<正>日前,记者从吉林大学了解到,在第二届"永冠杯"中国大学生铸造工艺设计大赛中,吉林大学材料科学与工程学院代表队获得骄人成绩,共获得一等奖1项,二等奖1项。
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发布时间：2023-12-18
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