最新刊期
卷 32 ， 期 7 ， 2012
- 摘要：7050 aluminum alloy ingots with 162 mm in diameter were prepared by direct chill（DC） casting process with applying a low frequency electromagnetic field,and effects of electromagnetic field on the as-cast microstructure were investigated.The experimental results show that low frequency electromagnetic field has a significant effect on both grain size and morphology of grains in 7050 alloy.The average grain size is evidently reduced from 230 μm to about 42 μm,and the morphology is transformed from coarse dendrite to fine spherical euiaxed structure.The electromagnetic field frequency and intensity play very important roles in refining the grain size.The optimum processing parameters for casting 7050 alloy ingot with 162 mm are presented as follows:electromagnetic field frequency of 25 Hz and electromagnetic field intensity of 12 800～16 000 At.关键词：Al-Zn-Mg-Cu-Zr Alloy;Low Frequency Electromagnetic Casting;Grain Refinement;Microstructure;Macrostructure
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发布时间：2023-12-18 - 摘要：Effects of Ca content on microstructure and mechanical properties of Mg-5Al-1Bi alloy were investigated by XRD（X-ray diffraction）,OM（optical microscope）,SEM（scanning electron microscope）,EDS（energy dispersive spectrometer） and mechanical property testing.The results show that the as-cast microstructure of the Mg-5Al-1Bi alloy is composed of matrix α-Mg and β-Mg17Al12 phases.With the addition of Ca,grains are refined,and the amount of phase Mg17Al12 is decreased with the morphologies transformed from continuous shape into more dispersed ones.The new secondary phase Al2Ca is generated with the Ca content increasing to 3%.Al2Ca phase with high melting point can pin the grain boundaries to restraint its slippage,which is beneficial to improve the high temperature creep resistance of the alloys.The hardness,yield strength are increased with the addition of Ca content,however,the tensile strength and elongation are decreased.关键词：Magnesium Alloy;Al2Ca Phase;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Hot compression deformation of GH690-RE alloy has been performed on the Gleeble-3500 hot simulator with strain rates of 0.001～2 s-1 at 950～1 200 ℃,and the flow stress-strain curves at different deformation conditions were analyzed.The results show that the flow stress is closely related to both deformation temperature and strain rate,and the flow stress is decreased with the increase of temperature and the decrease of strain rate.And the characteristics of flow stress can be described by the hyperbolic sine model.Material constants are determined by using the linear regression method based on the stress-strain curves,and the constitutive equation of GH690-RE alloy at hot deformation is presented.关键词：GH690-RE Alloy;Thermal Simulation;Stress-Strain Curve;Constitutive Equation for Hot Deformation
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发布时间：2023-12-18 - 摘要：The damping behavior of graphite particulates reinforced copper metal matrix composites Gr/Cu-MMCs was investigated by measuring internal friction（IF）,and based on the IF testing results and microstructure observation,the mechanism of improving damping behavior in Gr/Cu-MMCs was presented.The results show that damping performance of the composite can be increased with the introduction of macro-graphite particulates,and it is increased with the increase of volume fraction of graphite particulate.Besides of intrinsic damping,the dislocation damping and interface damping play the controlled role in improving the damping behavior.关键词：Composites;Pure Copper;Macroscopic Graphite Particulate;Internal Friction;Damping
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发布时间：2023-12-18 - 摘要：Semi-solid forming processing has developed 40 years till now,which is looked as an excellent and necessary metal forming processing between solid and liquid forming processing.Its global grains caused to shear-thinning characteristic can lead to both better fluidity and mechanical performance.Two indexes of "material quality utilization rate" and "material performance efficiency" indicate that semi-solid forming processing is the desirable way to realize energy saving and emission reduction.关键词：Semi-Solid Forming Processing;Material Quality Utilization Ratio;Material Performance Efficiency;Energy Saving and Emission Reduction
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发布时间：2023-12-18 - 摘要：<正>"长期以来,汽车工业稳居压铸工业的最大市场,近年来我国汽车工业的发展也不断拉动压铸工业进入一个全新发展期。"国际模协秘书长罗百辉表示,随着我国汽车市场潜力的释放,世界汽车工
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发布时间：2023-12-18 - 摘要：<正>近来,河北泊头市编制了《泊头市铸件制造行业达标条件暂行规定》,对企业布局、企业规模、铸造工艺、铸造装备、铸件质量、能耗与节能、废弃物排放与治理、安全生产、监督与管理等9个方面的内容作了详细的达标规定,先从铸件
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发布时间：2023-12-18 - 摘要：<正>铸造在机械工业中属于能耗相对高的行业,节能减排是我国铸造业的重要任务之一。中国铸造协会受国家工业和信息化部和中国工业机械联合会委托开展并完成了《机械工业节能减排政策研究（铸造部分）》工作,目前正和全国铸造标准化技术
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发布时间：2023-12-18 - 摘要：<正>由全国总工会、中国机械工程学会、装备再制造技术研究院、中国铸造协会等单位支持的第七届全国铸件缺陷修复新技术研讨会暨第二届全国铸造缺陷修复机操作技能总决赛,日前在京落幕。据悉,每年我国铸件废品率多达5%～15%,个别复
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发布时间：2023-12-18 - 摘要：Workflow Management System（WFMS） is a computer software system,which separates specific business process into multiple tasks or roles,executes these tasks according to certain rules and procedures and monitors themreal-time.Feasibility and difficulty of implementing WFMS in foundry enterprises by introducing the features of WFMS and the outlook of foundry enterprises management were reviewed.Finally,with a specific purchasing business workflow instance designed in this system,the results show that WFMS can design internal business process conveniently and improve the efficiency of business management significantly.关键词：Foundry Enterprises;WFMS;Information Management;Business Workflow
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发布时间：2023-12-18 - 摘要：The semi-solid A356 alloy parts were forged with 2000 kN vertical hydraulic press by squeeze casting.Effects of pouring temperature and extrusion pressure on microstructure and mechanical properties of the squeezing casting semi-solid A356 aluminum alloy parts were investigated.The results show that grains size can be refined and spheroidized with more compact,and tensile strength,yield strength and elongation are increased greatly with increasing in the squeeze pressure.However,with squeeze pressure more than 48.7 MPa,its effects on microstructure and properties of the parts prepared can be ignored.With a lower pouring temperature,crack easily occurs in the parts due to the higher solid fraction resulting in adequate filling,while with a higher pouring temperature,dendrite is dominant in the microstructure of the parts prepared as a result of high liquid fraction,which are responsible for the deterioration of mechanical properties.The acceptable microstructure and mechanical properties of the parts prepared can be presented by squeezing casting at 582 ℃ and 48.7 MPa,where tensile strength and elongation of the parts prepared reach 288 MPa and 14.6%,respectively.关键词：A356 Aluminum Alloy;Semi-solid Slurry;Squeezing Casting;Process Parameters
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发布时间：2023-12-18 - 摘要：<正>据相关报道称,日前,津南区大站阀门总厂等7家企业被农业部、全球环境基金、联合国发展计划署和联合国工业发展组织授予了"中国乡镇企业节能与温室气体减排项目"示范推广企业称号。据
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发布时间：2023-12-18 - 摘要：Nozzle for rolling mill as easily failure parts for high speed wire rod mill was produced with 17-4PH precipitation hardening stainless steel by investment casting.There exists many difficulties in the manufacturing process,and shrinkage porosity（hole） often occurs in the nozzle due to its complicated structure and obvious wall thickness difference.Meanwhile,crack can be easily generated at the runner location after heat treatment.Based on the structure characteristics of the nozzle parts,through optimizing mould design and making wax-pattern with paraffin-stearic acid low-point wax as well as silica sol shell molding,deformation can be effectively avoided,and dimension accuracy and surface roughness can be improved.The shrinkage porosity（hole） and thermal crack can be eliminated by optimizing gating system.Product-volumetric qualified castings were manufactured.关键词：Nozzle for Rolling Mill;17-4PH Precipitation Hardening Stainless Steel;Investment Casting;Heat Treatment
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发布时间：2023-12-18 - 摘要：Although lost foam casting（LFC）exhibits many advantages in producing planet gear frame,there exists easily shrinkage porosity（hole） due to its ductile iron and structure features.Shrinkage porosity（hole） was visualized at the key position of the castings by simulating the initial process with the help of the CAE software.The trial-production was conducted to verify the feasibility of the simulated results.The results were accordant with the simulated ones.The casting process was optimized on the basis of proportion solidification theory combined with the CAE software,and qualified planet gear frame was produced successfully.关键词：Planet Gear Frame;Shrinkage Porosity;Proportional Solidification Theory
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发布时间：2023-12-18 - 摘要：There exists serious sticking sand in low pressure sand casting ZL104 inter-axis transfer case,which is attributed to a higher reclaimed-sand in mold sand,a high baking temperature of sand mold（core） and un-rational core-box configuration as well as un-set incrustation.Through decreasing reclaimed-sand content in the mold sand and baking temperature of sand mold（core） to prevent sand mold（core） from crack,designing rational mould structure to increase compact degree by vibration as well as setting incrustation,sticking sand can be eliminated effectively.关键词：Sand Low-Pressure Casting;Castings;Sticking Sand;Orthogonal Experiment Design;Incrustation
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发布时间：2023-12-18 - 摘要：Aluminum die-casting non-stick pan exists variety of defects in the actual production,and bubble easily occurs in its surface due to be subjected baking at 430℃ during spraying process,resulting in product failure.Aiming at the problems,gating system of the aluminum die casting non-stick pot was designed and calculated,and the filling process of the designed scheme was simulated by the Flow-3D software.Based on the simulated result,the gating system was modified.Smooth filling can be observed in the modified gating system with the desirable filling effects,improving greatly the product quality and decreasing the defects.关键词：Aluminum Alloy;Non-Stick Pan;Die Casting;Filling Simulation;FLOW-3D
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发布时间：2023-12-18 - 摘要：Aiming at the working conditions of nozzle body,through theory analysis and failure analysis of the injury parts,the failure of nozzle body for Zn alloy die casting is attributed to small surface tension,high permeability and corrosion of zinc alloy melt as well as co-action of melt corrosion with stress corrosion.FeZn13 phase can be formed in the zinc alloy melt due to dissolution of Fe,C and Si from the tool steel.Meanwhile,dissolution of Fe in the Zn alloy melt can be promoted due to the existence of C,Si,P and S element,resulting in the high temperature corrosion of nozzle body during die casting Zn alloy process.Through co-infiltration treatment of RE-B on working face of nozzle body,the corrosion of nozzle body can be restrained,and its service life can be increased.The B-infiltrated layer with 60～70 μm in thickness can be formed with 4% RE addition at 950 ℃ for 7 h.The practical application shows that the service life of the nozzle body with B-infiltrated treated is 4 times higher than that without treated ones.关键词：Zinc Alloy;Die Casting;Nozzle Body;Stress Corrosion Cracking;RE-B Co-Infiltration
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发布时间：2023-12-18 - 摘要：Aluminum alloy RDU differential housing as a key parts in transmission system of the car exhibits the features of complex structure and high internal microstructure requirement as well as large forming difficulties.Die casting technology with low cost and high efficiency for the aluminum alloy RDU differential housing was developed,such as application of numerical simulation,advanced vacuum die casting associated with local pressurization and automation-proportion transmission of agent release.Through applying these technologies,microstructure,quality and stability of the housing are improved.360°full-direction high precision rotating fixture was adopted to decrease the error from multi-times fixing process,and qualified rate reaches 95%.关键词：Aluminum Alloy;Differential Housing;Vacuum Die Casting;Local Pressurization
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发布时间：2023-12-18 - 摘要：Effects of pressure and dual refiner（Al-5Ti-1B+Al-10RE） addition on microstructure of the squeeze casting hollow Al-Zn-Mg-Cu alloy drive shaft were investigated.The results show that with increasing in pressure,primary Al phase in the hollow Al-Zn-Mg-Cu alloy drive shaft is refined with spheroidization.With increasing in pressure to 160MPa,the coarse dendrites are disappeared,and the non-dendritic structure is observed,where the average grain size and equivalent roundness reach 25 μm and 0.73,respectively.The average grain size is significantly refined with the fluctuation of average equivalent roundness at 0.65～0.75 with decreasing in Al-5Ti-1B and increasing in Al-10RE.With 1% Al-5Ti-1B and 3% Al-10RE,the specimens can be obtained with 21 μm in average grain size and 0.70 in average equivalent roundness.关键词：Squeeze Casting;Al-Zn-Mg-Cu Alloy;Pressure;Dual refiner;Microstructure
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发布时间：2023-12-18 - 摘要：Filling process of vacuum die casting magnesium alloy steering gear was simulated by numerical simulation to understand the filling characteristics of liquid metal under the high vacuum conditions.Based on the simulated results,the filling and solidification of the alloy at high vacuum,low vacuum and conventional die casting were analyzed comparatively.The results show that filling capacity of liquid metal can be improved effectively with increasing in the vacuum degree,eliminating the gas hole defects in the steering gear,however,it is not related to the shrinkage porosity（hole）.关键词：Vacuum Die Casting;Vacuum Degree;Magnesium Alloy;Filling;Pore
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发布时间：2023-12-18 - 摘要：The flow field and temperature field in the self-developed horizontal-pulling heated mould continuous casting furnace with one-inlet to for-outlets for single crystallization copper were simulated by the Fluent software of CFD,and ite structure optimization was conducted.The results show that distribution of equal-distance location structure of outlets is un-reasonable at the holding furnace,where there exists obvious turbulence of inlet copper melt on outlet copper melt at No.1 and No.3 near inlet position.Meanwhile,the un-even temperature distribution at the holding furnace can be observed,and the maximum temperature difference between the inlet and outlets reaches 5 K,and there is a larger temperature difference between outlets of No.1,No.3 and No.2,No.4.Through designing two-side symmetric and unequal distance structure,where the distance of inlets from outlets of No.1 and No.3 is increased to 198 mm,flow and temperature distribution of liquid copper in the holding furnace exhibit desirable,and the temperature difference of outlets can be ignored.关键词：Heated Mould Continuous Casting;Fluent;Numerical Simulation;Structure Optimization
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发布时间：2023-12-18 - 摘要：During continuous-casting and rolling Al-Cu wire rod,the leakage of emulsified oil and lubricant oil could often be observed in the three-roller mini-stand,resulting in the pollution of emulsified oil and lubricant oil.Through analyzing the experiences from the production process,a very effectively detection method of detecting leakage of the stand was presented,which could treat various leakage phenomena in-time.So the high efficient stable running of the stand could be ensured,and the product quality was improved.关键词：Leakage;Sealing;Detection;Holding Pressure
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发布时间：2023-12-18 - 摘要：The characteristics of aluminum bronze material,using conditions and requirement for mechanical properties of porcelain sleeve flange were expounded.The porcelain sleeve flamge was produced by centrifugal casting.Through analyzing defects and implementing measures for eliminating defects,the proper centrifugal casting process was presented.By controlling strictly production process,the qualified porcelain sleeve flange was produced successfully.关键词：Centrifugal Casting;High Ductility;Aluminum Iron Bronze;Flange for Porcelain Sleeve
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发布时间：2023-12-18 - 摘要：The nHA Ti-based biomedical composites were prepared by powder metallurgy,and effects of nano-hydroxyapatite on microstructure and performance of Ti-based biomaterials prepared were investigated by XRD（X-ray diffraction）,EDS（energy dispersive spectrometer）,SEM（scanning electron microscope） and compression elastic modulus testing.The results show that the major phase is Ti phase,and Ti2O,Ti5P3,and CaTiO3 are generated and distributed in the around of Ti phase.The addition of nano-hydroxyapatite can change the sintering property and increase the porosity of the materials prepared.Compared to pure Ti specimen,the compressive elastic modulus of nano-hydroxyapatite/Ti biomaterial is reduced by a half,which is near to the human cortical bone’s.The biomineralization process and cell activity analysis also show that the nano-hydroxyapatite /Ti biomaterial has better biological activity,and it is more suitable for human hard tissue replacement and repairment.关键词：Ti-Based Biomaterial;Nano-Hydroxyapatite;Microstructure and Performance
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发布时间：2023-12-18 - 摘要：Functions or structural materials with high thermal conductivity,high wear resistance and high hardness could be prepared with diamond particles reinforced metal matrix,which could be widely used in many fields,such as electronic component,equipment manufacturing and rail transportation,and so on.The characteristics and the research progress in diamond/metal matrix composites were surveyed,and the conventional preparation techniques and methods of the diamond/metal matrix were presented.In addition,some problems in the composites were described.关键词：Diamond;Particle Reinforcement;Composites;Research Progress
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发布时间：2023-12-18 - 摘要：In-situ Mg2Si/AM60 composites melt was treated by continuous power ultrasonic.Effects of ultrasonic treatment on secondary phase morphology and mechanical properties of Mg2Si/AM60 composites were investigated.The results show that the morphology of Mg17Al12 exhibits the change from semi-continuous net-structure into granular shape in the in-situ Mg2Si/AM60 composites,and coarse Chinese script Mg2Si phases become fine granular shape and uniformly distributed in the composites with ultrasonic treatment of 600W power for 60 s.The grain size is reduced to 80 μm,meanwhile,the tensile strength and elongation of Mg2Si/AM60 composites are increased to 196.75 MPa and 5.28%,respectively,increased by 10.4% and 48.3%,compared with 178.24 MPa and 3.56% of one without ultrasonic treatment.关键词：Ultrasonic Treatment;In-Situ;Composites;Mg2Si;AM60
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发布时间：2023-12-18 - 摘要：The grain structure of Al-Si-Mg alloy with modification of Al-5Ti-1B becomes coarse after melt refining treatment by N2,Which shows the refining treatment weakens the grain refinement efficiency of Al-5Ti-1B master alloy to Al-Si-Mg alloy.It is analyzed that TiB2 particles and their aggregations are easily captured by N2 bubbles and free from the melt,resulting in the obvious decrease of number of nucleating subtrates.Two solution approaches were presented,adjusting addition order of refiner and adopting new Al-5Ti-0.6B-0.2C master alloy.关键词：Al-Si-Mg Alloy;Refining Treatment;Grain Refinement;Nucleating Substrate;Bubbles
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发布时间：2023-12-18 - 摘要：Microstructures and mechanical properties of AEZ611 magnesium alloy extruded during of aging is investigated.The results show that grain size becomes coarse with uneven distribution in the alloy after aged in box-type resistance furnace,while it is refined in oil bathing,which is beneficial for improving the mechanical properties.In addition,mechanical properties and microstructure of the alloy are closely related with temperature.With aging temperature increased to 200 ℃,precipitation velocity of secondary phase is aclelarated with more homogeneous distribution,and fine black pit-shape phase is dispersedly distributed into grain bonundary.With increasing in holding time,precipitates of Al4Ce is increased with unform distribution,which further improves the mechanical properties of the alloy.Mechnical properties of the alloy are related with precipitates,size and morphology of RE phase.With aging at 390 ℃ for 1 h in oil bathing and at 200 ℃ for 20 h,tensile strength,yield strength and elongation of the alloy reach 311 MPa,232 MPa and 11%,respectively.关键词：AEZ611 Alloy;Hot Pressing Forming;Aging;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Mg-5.8Sm-0.4Zn-0.3Zr（SZ58K） alloy was prepared by metal mold gravity casting,and the alloy prepared was treated by solid solution,and aging curve was drawn.The microstructure and mechanic properties of Mg-5.8Sm-0.4Zn-0.3Zr alloy in different heat treatment states including solid solution and ageing treatment were investigated by optical microscope（OM）,scanning electron microscope（SEM） and X-ray diffraction analysis（XRD）.The results show that the as-cast alloy consists of α-Mg matrix and Mg41Sm5 phase near the grain boundaries.After solid solution treatment,the second phase is decomposed,and small amount of square-like phase（mainly Sm） can be found in the grain with slight growth of the grain size.The change of yield strength can be ignored,while the ultimate tensile strength and elongation are remarkably increased.After aging treatment,yield strength is increased greatly,and ultimate tensile strength is increased slightly,while elongation is sharply decreased.关键词：Rare-Earth Magnesium Alloy;Mg-Sm;Microstructure;Mechanic Properties
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发布时间：2023-12-18 - 摘要：Protective effects of the atmosphere of FeS2 and HFC-134a mixed with air on magnesium alloy melted in a sealed melting furnace were analyzed.The results show that the atmosphere of air containing both sulphur and fluorine has a good protective effect on magnesium alloy melting,and with the same melting temperature and holding time,it is better than that containing only sulphur or fluorine.The atmosphere with 0.15% HFC-134a and 1g FeS2 can prevent magnesium melt from oxidation and combustion at 730 ℃ for 1 min to 30 min.However,holding for 60 min at 730 ℃,the atmosphere is failure.The characteristics of the surface film formed at controlled condition was analyzed by SEM,EDS and XRD.The protective films formed in the atmosphere of air containing both sulphur and fluorine contain Mg,F,O and S,and the basic phases are MgF2,MgO and MgS.With the increase of holding time,the surface film exhibits more homogeneous,denser and thicker due to the increase of MgF2 and MgS in the MgO-based oxide film.关键词：Magnesium Alloy;Surface Film;FeS2;HFC-134a
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发布时间：2023-12-18 - 摘要：Sn-Zn alloy with low melt point was prepared by casting technology.The structure and heat storage properties were investigated by optical microscope（OM）,XRD（X-ray diffraction）,DSC and laser thermal constants measuring apparatus.The results show that the latent heat of the alloy and phase-change temperature,thermal conductivity are 198.1 ℃,65.8 J/g and 53.4 W/（m·K）,respectively.The phase change temperature is increased slightly and latent heat and thermal conductivity are decreased gradually with the increase of thermal cycling.The change rate of phase change temperature,thermal conductivity and latent heat of the alloy is below 5% after 500 heat cycles。关键词：Sn-Zn;Heat Storage;Thermal Cycling;Stability
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发布时间：2023-12-18 - 摘要：Growth of the interfacial intermetallic compound（IMC） and the evolution of shear strength of the Sn-3.0Ag-0.5Cu/Cu joints with welding for 1,5,10 min and aging at 373,403,438 K,respectively,were investigated by optical microscope（OM） and SEM（scanning electron microscope）.Meanwhile,fracture morphology and fracture mode of the solder joints were also analyzed.The results show that with the increase of welding time,the thickness of the IMC layer is increased.With increasing in aging time,IMC thickens is increased,and its growth dynamics follows a parabolic growth pattern,and the growth activation energy is 75.03 kJ/mol.The shear strength of solder joints is decreased with extending in aging time.The fracture mode is transformed from the ductile fracture into local brittle fracture gradually.关键词：SnAgCu Lead-free Solder Joints;Aging;Interfacial IMC;Shear Strength
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发布时间：2023-12-18 - 摘要：Effects of homogenizing treatment on the microstructure and properties of ZA35-0.3Zr alloy were investigated by observing microstructure,testing mechanical properties and electrochemical behavior,and the optimized temperature and time of homogenizing treatment were presented.The results show that severe dendritic segregation and non-equilibrium β phases can be observed in as-cast structure of ZA35-0.3Zr alloy with severe Cu-enrichment on the grain boundary.With the increase of homogenizing treatment time,the CuZn5 phase is disappeared gradually,and eutectoid decomposition of β phase is increased.After homogenizing at 370 ℃ for 12 h,the CuZn5 phase disappears due to dissolving into the matrix to make dendrite segregation decrease significantly,and the absence of non-equilibrium β phase at grain boundaries can be observed.Meanwhile,tensile strength and elongation of the ZA35-0.3Zr alloy reach 306 MPa and 7.35%,respectively.The open circuit potential of homogenized ZA35-0.3Zr alloy is changed to positive,and the corrosion current density is reduced by 33.1%,compared with ZA35-0.3Zr alloy without homogenizing treatment in 3.5% NaCl solution,leading to the improvement of corrosion resistance of the alloy.The optimized homogenization treatment is 370 ℃×12 h.关键词：ZA35-0.3Zr Alloy;Homogenizing;Microstructure;Properties
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发布时间：2023-12-18 -
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