最新刊期
卷 28 ， 期 12 ， 2008
- 摘要：Effects of Be addition on the as-cast microstructure,mechanical properties and corrosion resistance of AZ91 magnesium alloy were described.It is indicated that size of primary α-Mg phase and morphology,size and distribution of γ-Mg17Al12 phase in microstructure can be greatly changed with the addition of Be into the AZ91 magnesium alloy.Meanwhile,with increasing in Be addition,tensile strength and elongation of the alloy are firstly decreased then increased and then decreased.Tensile strength and elongation of the alloy with 0.15% Be addition are 167.74 MPa and 5.87%,respectively,which are increased by 11.4% and by 215.6%,respectively,compared with those of the alloy without Be addition.The corrosion rate of the AZ91 magnesium alloy with Be addition is higher than that of one without Be,showing the deterioration of corrosion resistance of the alloy with Be.关键词：Magnesium Alloy;Microstructure;Mechanical Properties;Corrosion Resistance
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发布时间：2023-12-18 - 摘要：Erosion behaviors of surface diffusion alloyed coating on pure magnesium were examined by conducting erosive testing for pure Mg treated by surface diffusion alloying method in case of different erosive media.The results indicate that the micro-hardness of surface diffusion alloying coating on the diffused pure Mg reaches up to HV166,increased by more than one times compared with that of the matrix.The diffused alloyed specimens were eroded in oil and quartz media and in water and quartz media.It is found that wear resistance of pure Mg specimens with diffusion alloyed coating are superior to that of un-treated ones in two kinds of media.关键词：Micro-Hardness;Erosion Wear;Diffusion Infiltration
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发布时间：2023-12-18 -
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- 摘要：Effects of mold configuration parameters,such as cover plate,slit numbers,slit width and slit length,on distribution of magnetic flux intensity and shape of meniscus in electromagnetic soft contact continuous casting mold for slit round billets were described.It is found that distribution of magnetic flux intensity and height of meniscus in the mold are independent of the presence or absence of cover plate.However,with increasing in slit numbers,the magnetic flux intensity and height of meniscus in the mold can be increased,where increasing in slit numbers from 24 to 32,peak value of magnetic flux intensity and height of meniscus are increased by 32% and by 110%,respectively.Meanwhile,with increasing in slit width from 0.3 mm to 0.5 mm,the magnetic flux intensity is increased by 15% with the increase of height of meniscus.In addition,with increasing in slit length from 100 mm to 130 mm,the peak value of magnetic flux intensity and height of meniscus are increased by 28% and by 155%,respectively.关键词：Mold;Electromagnetic Continuous Casting;Slit Parameters;Magnetic Field Distribution;Meniscus
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发布时间：2023-12-18 - 摘要：Directional solidification structure of pure copper was observed based on ECAP through route A and Bc.The result reveals that with proceeding in deformation,continuously increased sliding band with interact cross can cut the initial sliding band to make coarse columnar grain further crush into two-dimensional cellar structure.Furthermore,the single grain copper was converted into uniformly distributed fine equiaxed grain by high density dislocation after multi-shearing and cross-sliding effects in passes of ECAP.In addition,the refining effect by route A is obviously superior to that of one by route BC.Tensile strengths of the pure copper with directional solidification structure are 420 MPa and 412 MPa,respectively,and elongations are 23.0% and 26.5%,respectively,with seven passes for route A and route BC.关键词：ECAP;Pure Copper;Oriented Solidification Structure
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发布时间：2023-12-18 - 摘要：Effects of compound coating prepared by cast-infiltration on surface hardness of aluminum alloy parts were examined.The results show that Cr,Al2O3 and WC powders in the compound coating can obviously improve the surface hardness of aluminum parts.Carbon fiber powder as a new material,showing similar lubricity with graphite,can also greatly strengthen surface hardness.In addition,it is helpful for the formation of cast-infiltration layer and improvement of surface hardness by properly increasing pouring temperature.关键词：Casting;Cast-Infiltration;Coating
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发布时间：2023-12-18 -
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- 摘要：Temperature field in permanent mold during solidification was adjusted by means of mould coating combining with localized cooling for mould.Solidification process of aluminum alloy wheel in permanent gravity casting was simulated by the ProCAST software,and the modified processing design was proposed based on the analysis of hot spot location in aluminum alloy wheel,successfully eliminating hot spot in the wheel.The results validate that it is helpful for predicting defects in the wheel in permanent gravity casting and for modifying processing design by numerical simulation.关键词：Permanent Gravity Casting;Numerical Simulation;Solidification Process;Aluminum Alloy Wheel;Hot Spot
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发布时间：2023-12-18 - 摘要：According to practical production and casting processing data,a special module based on exchanging data between the Access and the ODBC on MFC was developed to design standard waist-round riser and cylinder riser simply and easily,which can significantly improve design efficiency and accuracy of riser,exhibiting extensive prospect.关键词：Exchanging Data;Special Riser Module;Standard Drawing;Casting Process CAD
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发布时间：2023-12-18 - 摘要：How to use virtual reality technology to design the squeezing casting mould quickly,accurately and interactively was expounded.The visualization of disassembling,assembling,mould-opening,mould-closing and mould-unloading of squeezing casting mould for ZF80-50 aluminum alloy stand was conducted by means of 3D Max and Cult 3D,and the detection of the mould interference was completed.Furthermore,the running principle and assembling relation among parts were demonstrated dynamically.The virtual reality design can optimize the mould structure and shorten the designing period as well as improving reliability of design.关键词：Squeezing Casting;Mould;Virtual Reality;Pro/E;Cult 3D
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发布时间：2023-12-18 - 摘要：According to its crystal configuration,silicon materials for polar cell can be classified in monocrystalline silicon,multicrystalline silicon and amorphous silicon.The characteristics,history and present research status of three kinds of silicon materials were reviewed,and the related problems and future development were described.Three kinds of silicon materials possess their merits and dismerits as well as different applied field,and they would be developed with the development of silicon processing technology.It can be concluded that the multicrystalline silicon,silicon ribbon and thin film silicon will be dominant in PV market in the future owing to their high cost-performance ratios.关键词：Solar Cell;Monocrystalline Silicon;Multicrystalline Silicon;Amorphous Silicon
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发布时间：2023-12-18 - 摘要：Numerical simulation of preparation processing of semi-solid A356 aluminum alloy slurry was conducted by the ProCAST software with cooling water volume of 25,50,75 mL/s,in which temperature field coupling with velocity field was taken into account.The desirable semi-solid A356 aluminum alloy slurry can be prepared successfully with cooling water at 50 mL/s and outlet temperature of aluminum alloy at 600 ℃ as well as outlet temperature of water at 25 ℃.The experimental results are well in agreement with that of simulated ones.关键词：Single-tube with Strong Cooling;Semi-solid;A356 Aluminum Alloy;Numerical Simulation;Temperature Field
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发布时间：2023-12-18 - 摘要：Optimized processing parameters for die casting cylinder cover were determined by orthogonal testing combining with numerical simulation of JSCAST software.The results indicate that the desirable cylinder cover can be produced with pouring at 690℃ and injecting velocity at 7 m/s as well as preheating die at 210℃,which was validated by practical production,showing availability of numerical simulation in die casting.关键词：Orthogonal Testing;Processing Parameters for Die Casting;JScast Software;Cylinder Cover
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发布时间：2023-12-18 - 摘要：Setting ways of accelerating velocity and critical velocity of slow shot were described based on principle of slow shot and second filling combining with p-Q2 diagram,and calculating equation for pre-filling time and pre-filling volume was presented.Application of slow shot and pre-filling in die casting cylinder block was expounded.It is noted to set critical velocity and accelerating velocity in slow shot in die casting cylinder block.Slow velocity pre-filling with 10%30% filling volume for cavity should be performed before high velocity filling,in which it is a key to accurately calculate pre-filling liquid metal volume as well as filling velocity in pre-filling and shrift point in pre-filling block.关键词：Slow Shot;Pre-filling;p-Q2 Diagram;Die Casting Press;Cylinder Block
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发布时间：2023-12-18 - 摘要：We have developed a simply reliable movable-local pressurization set-up with multi-loop and feasible parameters adjustment as well as cheap prices,which was employed successfully for the production of complicated die parts.Effects of local pressurization configuration and fit tolerance between pressurized pin and pin-sleeve on service performance were expounded.Fit tolerance of two kinds of pressurized pin with 8 mm and 12 mm in diameters was determined to ensure the service life.Effects of local pressurization parameters on quality of die castings were investigated.The results indicate that with increasing in local pressure,defects in the die castings can be greatly eliminated.In addition,with a given pressure,short pressurization start time is beneficial for the elimination of defects.Qualified rate of die castings can reach up to 97% by means of local pressurization.关键词：Die Casting;Local Pressurization;Aluminum Alloy;Shrinkage Porosity
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发布时间：2023-12-18 - 摘要：Effects of aging treatment on microstructure and mechanical properties of A357 aluminum alloy by vacuum pressurized castings were investigated by tensile testing and OM（optical microscope）.The results reveal that tensile strength,elongation and hardness of the alloy with aging at 170 ℃ for 2h followed by 185 ℃ for 1h reach 345 MPa,7.0% and 105HBS,respectively,as a result of generation of uniformly dispersed fine aging strengthening phase enhancing the mechanical properties of the alloy.关键词：A357 Alloy;Vacuum Pressurization;Dual-stage Aging;Mechanical Properties;Microstructure
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发布时间：2023-12-18 - 摘要：Present status on environmental protection and energy-saving in Chinese investment casting industry was described,and the countermeasures were presented.Some measures,including water-treatment equipment,shell-mold recycled equipment,water-curtain equipment for dust removal as well as electric heating baking furnace,were used to reduce emission during production.The developing tendency on energy-saving in Chinese investment casting industry was expounded,such as upgrading of baking furnace configuration,adjustment of heating ways,improvement of holding temperature for furnace body.In addition,it is an acceptable choice for employing main frequency induction electric furnace,selecting the optimized volume as well as operating on-furnace.关键词：Investment Casting;Environmental Protection;Energy-saving
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发布时间：2023-12-18 - 摘要：It is difficult to make the whole wax-pattern and to clean sand in cavity for the investment castings with large cavity and small aperture.So two wax-patterns which were welded into an integration were adopted in wax-pattern making.Meanwhile,sol silicate-silicate sodium compound shell making was used.The investment castings can be produced successfully through above two ways.In addition,some notes in pattern making and shell making process were described.关键词：Investment Casting;Pattern Making;Compound Shell Making
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发布时间：2023-12-18 - 摘要：Effects of the jute fiber on the permeability of coating for vacuum-expandable pattern casting were examined by measuring permeability of the coating with different jute fiber content at 100800 ℃.It is found that with 0.2% and 0.5% jute fiber content,the permeability of coating is raised sharply at 400600℃ and it keeps stable value of 5.86.3 cm4·g-1·min-1 and 9.810.6 cm4·g-1·min-1.The results exhibit that addition of jute fiber can affect permeability of coating for vacuum-expandable pattern casting.关键词：V-EPC Casting;Coating;Permeability;Jute Fiber
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发布时间：2023-12-18 - 摘要：Compared with that of one with only induction coils,the magnetic induction intensity in mold for electromagnetic continuous aluminum alloy slab measured by the Teslameter can not meet the requirements of soft contact electromagnetic continuous casting as a result of the dramatic fading of magnetic induction intensity in the mold,which is attributed to the low magnetic conductivity of aluminum wall resulting in the eddy loss in electromagnetic field.The silicon steel sheets with excellent magnetic conductivity can decrease magnetic reluctance in the mold and make major magnetic lines form loop to reduce magnetic fading and to improve the magnetic induction intensity in the mold through arranging around the induction coils.The optimized arranging condition of silicon steel sheets in the mold is as follows:setting silicon steel sheets at side and bottom of the induction coils,in which setting numbers at the side are six sheets with 1.8 mm in thickness and at a distance of 8.5 mm from coil.关键词：Soft Contact;Electromagnetic Continuous Casting;Silicon Steel Sheet;Magnetic Induction Intensity
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发布时间：2023-12-18 - 摘要：ANN（artificial neural network） model was established based on RBF（radial base function）and genetic algorithm to solve high crack tendency in large aluminum alloy ingot and un-rational technological parameters determination.The optimized design of technological parameters for aluminum alloy electromagnetic semi-continuous casting was conducted by means of modified genetic algorithm through taking minimum crack value as optimized end and taking trained RBF network as estimated function,and optimized technological parameters were presented.The experiment was performed based on the optimized technological parameters.The results indicate that the qualified rate of ingot is increased by 20%.关键词：Aluminum Alloy;Genetic Algorithm;Parameter Optimization;Semi-continuous Electromagnetic Casting
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发布时间：2023-12-18 - 摘要：Nano-SiCp/AZ91D composites were prepared successfully by high intensity ultrasonic method.Tensile strength and yield strength of the prepared composites are superior to those of the matrix alloy as a result of high intensity ultrasonic obviously dispersing nano-ceramic particles in magnesium alloy melts.Tensile strength of the composites makes 200 MPa with 0.5% SiC addition with approximately 40 nm in size,exhibiting a better properties.关键词：High Intensity Ultrasonic Method;Magnesium Matrix Nano-composites;Nano-sized SiC Particles
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发布时间：2023-12-18 - 摘要：SiCp particulate with 51.5% volumetric fraction reinforced Mg-6Al-0.5Mn composites was prepared by an squeezed-infiltration method.Effects of high volumetric fraction SiC particulate reinforcement on the microstructure and mechanical properties of the Mg-6Al-0.5Mn alloy were investigated by compressive testing,scanning electron microscope（SEM） and transmission electron microscope（TEM）.It was found that compressive strength of the composites at room temperature can be greatly increased from 929.5 MPa to 624.8 MPa with addition of 51.5% SiC particle.The compactive microstructure with uniformly distributed SiCp particle can by observed in the composites,and the fracture mechanism is characterized by the boundary separation,ductile fracture of the matrix alloy and reinforcement crack.In addition,nano-Mg2Si phase can be observed in the microstructure as a result of boundary reaction of SiC particle with matrix alloy.关键词：Magnesium Matrix Composites;SiC Particle;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Aiming at the operating conditions,the dual-metal compound hammerhead was manufactured by an electro-slag smelting-casting method,in which high Cr cast iron was used for the hammer head and carbon structural steel was used for the hammer handle.The microstructure of the hammerhead exhibits full metallurgical bonding in the interface,which is composed of martensite and dispersively distributed M7C3 phase with high hardness after heat treatment.The hardness of working location of the hammerhead makes HRC5658.The practical operation indicates that the service life of dual-metal compound hammerhead is higher about two times than that of high Mn steel ones.关键词：Electro-slag Smelting-casting;Dual-metal;Hammerhead;Metallurgical Bonding
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发布时间：2023-12-18 - 摘要：We have developed an experimental device to examine the reaction of magnesium alloy with N2 under static condition,especially ignition point of Mg and Mg alloy.It is found that ignition point of Mg alloy under nitrogen atmosphere can be increased with additions of Y,Ce,Nd and Ca,especially Ca addition.Ignition point of Mg-3Y and Mg-3Ca can be decreased with Ce addition,while ignition of Mg-1Nd alloy can be greatly increased with Ca addition.Ignition point of Mg alloy under nitrogen atmosphere is obviously higher than that of ones in air.
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发布时间：2023-12-18 - 摘要：Effects of Fe,Si,hydrogen,Al2O3 inclusion in electrolyte liquid aluminum on as-cast microstructure and properties of 7005 aluminum alloy were investigated by means of optical microscope（OM）,scanning electron microscope（SEM）,energy spectrum analysis and ambient tensile testing.The results indicate that impurity elements Fe and Si can react with Mg and Mn in electrolyte liquid aluminum to form the second phase,such as AlFeMnSi and Mg2Si,which is distributed along the grain boundary or in the grain.The metallurgical quality of liquid aluminum in short-flow process is basically controlled by hydrogen and Al2O3 inclusion generated in the course of Al electrolysis.Existence of gas porosity formed during casting is responsible for fracture of the as-cast 7005 aluminum alloy.关键词：7005 Aluminum Alloy;Electrolyte Liquid Aluminum;Al2O3 Inclusion
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发布时间：2023-12-18 - 摘要：Effects of P-RE mixed modification with different P and RE additions on impact toughness of hypereutectic Al-20Si alloy were measured,which were compared with those of ones without modification treatment.The results reveal that impact toughness of the hypereutectic Al-20Si alloy can be obviously improved with P-RE mixed modification.With 0.08% P and 0.6% RE mixed addition,compared with that of 9.7862 J/cm2 of ones without modification,the impact toughness of the alloy makes 11.009 8 J/cm2,increased by 12.5%,exhibiting desirable properties.The mechanism of impact fracture is characterized by brittleness fracture together with ductile fracture,which is attributed to the refinement of primary Si and eutectic Si phase and the increase of strength and ductibility of the alloy caused by mixed modification of P and RE.关键词：Hypereutectic Al-Si Alloy;Mixed Modification;Impact Toughness
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发布时间：2023-12-18 - 摘要：Current efficiency of the Al-5Zn-0.03In-1Mg-0.05Ti-0.5RE that is solution treated at 510 ℃ and 550 ℃ for 10 hours,respectively,was tested in artificial seawater.And the electrochemical behavior of the alloy in 3% NaCl solution was examined by electrochemical impedance method.It is found that current efficiency and open circuit potential as well as operating potential of the alloy are increased after solution treatment,which accelerates the dissolution.关键词：Sacrificial Anode Materials;Electrochemical Behavior;Current Efficiency;Corrosion;Electrochemical Impedance
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发布时间：2023-12-18 - 摘要：Effects of Y,Gd and Ca on the microstructure and mechanical properties of AZ81 magnesium alloy were investigated by microstructural observation and testing.The results indicate that additions of Y,Gd and Ca element can distinctly refine the grain size in microstructure of AZ81 magnesium alloy,resulting in the reduction of β（Mg17Al12） phase and the precipitation of acicular and granular Al2Y phase Al2Ca phase.With increasing in addition of the elements,tensile strength and elongation of the aged magnesium alloy are firstly increased and then decreased at 20175 ℃.The desirable tensile strengths of the alloy at room temperature and at 175 ℃ reach 230 MPa and 160 MPa,respectively,with the total Y,Gd and Ca addition of 2.1%,which is attributed to grain refining strengthening,solution strengthening and dispersion strengthening by Y,Gd and Ca.关键词：Y;Gd;Ca;AZ81 Magnesium Alloy;Microstructure;Mechanical Properties
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发布时间：2023-12-18 -
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