最新刊期
卷 39 ， 期 11 ， 2019
- 摘要：The effects of Gd and Nd addition on the microstructure evolution of the as-cast and as-extruded Mg-3Zn alloy were investigated by optical microscopy（OM）and scanning electron microscopy（SEM）.The tensile mechanical properties of the alloy at room temperature were tested.The results show that the as-cast microstructure of Mg-3Zn alloy can be refined significantly with addition of Gd and Nd,and a large number of second phases can be observed in the microstructure.The microstructure of the extruded alloy is refined with a large amount of recrystallized crystals,and the second phase particles are distributed in a fiber shape along the extrusion direction.With the addition of Gd and Nd,the tensile strength and yield strength of the Mg-3Zn alloy are improved significantly.The maximum value reach 265 MPa and 225 MPa,respectively,while the change of elongation can be decreased.关键词：Mg-Zn-Gd-Nd Alloy;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The cellular Al-0.38Sc foams with a porosity ranging from 48% to 86% were fabricated successfully via the melt-foaming method.The compressive behaviors,corrosion resistance and effects of minor Sc additions on the strengthening mechanism of the cellular Al-Sc alloy foams were investigated.The results reveal that minor Sc additions can improve dramatically the compressive strength of the cellular Al foams due to formation of the Al3Sc precipitates uniformly distributed in the matrix after heat treatment,to pin the grain boundary/dislocations.Moreover,the self-etch current and radius of the Nyqusit curve radius of the cellular Al-0.38Sc foams are close to cellular Al foam,showing that the Sc addition combined with proper heat treatment is an effective way to improve the mechanical performance of Al-based alloy foams with desirable corrosion resistance.关键词：Cellular Al-Sc Alloy Foam;Compressive Yield Strength;Heat Treatment;Nano Precipitates
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发布时间：2023-12-18 - 摘要：The effects of electric current pulse on microstructure and mechanical properties of the AZ80-4 Sn magnesium alloy were investigated by pulsed current treatment at different frequencies including 0,300 and 600 Hz in solidification process.The results reveal that the solidification structure of AZ80-4Sn magnesium alloy can be refined and its mechanical properties can be improved by electric pulse treatment.In a certain range,with the increase of pulse frequency,microstructure and properties of the AZ80-4Sn magnesium alloy are improved gradually.Compared with the AZ80-4Sn alloy without pulse treatment,when the AZ80-4Sn alloy is treated by 600 Hz,the coarse dendrite structure is refined with the decrease of the secondary dendrite spacing,meanwhile the larger bulk Mg2Sn phase is refined and distributed uniformly in the matrix ofα-Mg,where the tensile strength and elongation of the alloy are increased from 101 MPa and 2% to 173 MPa and 2.6%,improved by 71.3% and 30%,respectively.关键词：AZ80-4Sn Magnesium Alloy;Electric Pulse Treatment;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Aiming at the problems in easily fatigue failure at flat-end region of spring during service processing,the samples were taken from different period of heat-treatment spring to analyze the reason leading to fatigue broken in the region of flat-end rolling,and a measure to improving the technique parameter of flat-end rolling was persented.The results show that spring microstructure is increasingly coarsened with decreasing in distance toward the end.And then,the quenched martensite is coarsened,and the tempered structure is tended to be nonuniform due to the heredity,so then the tensile strength and hardness present fluctuation considerably in this region.The coarsening of microstructure is attributed to by the over-heating before flat-end rolling.Hence,the heating temperature and the holding time need to be controlled precisely to improve the quality of spring end.关键词：Spring Steel;51CrV4;Flat-end Rolling;Strength;Hardness
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发布时间：2023-12-18 - 摘要：The microstructure and properties of domestic and foreign AlSn20Cu-steel bearing bush composites were analyzed comparatively by using OM、SEM、EDS and Vickers hardness tester as well as other equipments in order to better develop the bearing bush composites.The results show that the microstructure of steel matrix is composed of pearlite and ferrite.The ferrite grain size of the foreign material is larger than that of the domestic ones,and the ferrite in the domestic material has obvious deformation.The thickness of alloy layer of foreign bearing bush composites is much smaller than that of domestic ones.The hardness of the two kinds of bearing bush composites is increased from the alloy layer to the interface to the steel matrix,however,the hardness of the steel matrix of domestic material is higher than that of foreign ones,while the interface of domestic materials shows obvious separation after cold bending experiment.关键词：Bearing Bush;AlSn20Cu-Steel Composites;Microstructure;Properties
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发布时间：2023-12-18 - 摘要：The effects of tempering temperature at 200～600 ℃ on microstructure and hardness of ZG5Cr17Ni2 martensitic stainless steel were investigated by means of optical microscopy,scanning electron microscopy,X-ray diffraction and Rockwell hardness tester.The changes of microstructure and hardness of the ZG5Cr17Ni2 martensitic stainless steel during the second tempering were analyzed.The results show that the microstructure is composed of tempered martensite+retained austenite+carbides+ledeburite and new quenched martensite with tempering less than 500℃.The hardness distribution presents in saddle shape,and the maximum value is 50 HRC at 500℃.When the tempering temperature is 600℃,the martensite is decomposed to form tempered sorbite,and the hardness is rapidly reduced to 36 HRC.After the second tempering at 500 ℃,the retained austenite is decreased and the carbide precipitation is increased,however the hardness has a little change for second tempering.关键词：ZG5Cr17Ni2 Martensitic Stainless Steel;Tempering;Microstructure;Hardness
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发布时间：2023-12-18 - 摘要：Bacterial infection is one of the most urgent clinical problems in metallic biomaterials for the hard tissue repair and replacement.It is an effective way to solve the above problems by adding Cu element to traditional stainless steel,titanium alloy,new alloying elements and metallic biomaterials to endow the alloys with anti-infection ability.The antibacterial mechanism of Cu2+ and the research progress in metallic antibacterial biomaterials containing copper at home and abroad were reviewed in recent years,and the existing problems in the research were summarized and analyzed to provide references and prospects for further research.关键词：Biomedical Metallic Materials;Antibacterial Materials Containing Copper;Antibacterial Mechanism;Anti-infection
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发布时间：2023-12-18 - 摘要：The microstructure and microhardness of laser forming repaired（LFRed） K418 superalloy were investigated.The results reveal that the LFRed sample can be divided into cast substrate zone（CSZ）,heat-affected zone（HAZ）and laser repaired zone（LRZ）.The microstructures with different morphology,size and number are composed ofγ-FeCr0.29Ni0.16C0.06matrix phases,γ′-Ni3Al phases and MC carbides phases.The LFRed sample presents a compact metallurgical bonding between CZS and LRZ.The LRZ presents columnar dendrites which grew epitaxially along the direction of deposition and a consecutive layer structure.There are difference in microhardness because of difference in grains size at the same deposition layer.The average microhardness of CSZ,HZA and LRZ reach 432.4,499.4 and 490.6HV,respectively.关键词：Laser Forming Repairing;Laser Additive Manufacturing;K418 Superalloy;Microstructure;Microhardness
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发布时间：2023-12-18 - 摘要：According to the simulated result of casting process of the integrated complex aluminium shell,chills were set in perticular positions in the 3D print sand mold.Appropriate fit tolerance was set between sand mold and sand cores,and the surface of sands mold and sand cores was coated and low pressure casting process was applied,so the aluminium shell was manufactured and it′s properties meet the technical requirements.关键词：3D Prtinted Sand Mold;Casting Process Simulation;Integrated Aluminium Casting
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发布时间：2023-12-18 - 摘要：The casting process of complex thin-wall aluminum alloy castings was described,and a double runner system with annular bottom injection was designed.The casting process was simulated by using ProCAST software,and temperature field of the filling and solidification process of the initial design was analyzed to determine the locations of shrinkage cavity and porosity of the casting.Through adding risers and cold iron in the appropriate locations to change the solidification sequence of the casting,the defect locations were effectively feeded and the casting production yield was improved.关键词：Aluminum Alloy Casting;Numerical Simulation;Casting Process;Temperature Field
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发布时间：2023-12-18 - 摘要：The meshless SPH method was used to simulate the ECAP process of can at room temperature based on the developed program.Through comparing with the experimental ones,the simulated results obtained by the SPH program were well in agreement with ones.The results reveal that under the same extrusion conditions,5052 aluminum alloy cladding material can’t protect pure magnesium,so the workpiece is cracked.Compared with the outer cladding material of 5052 aluminum alloy,the pure iron cladding provides better protection for the internal pure magnesium workpieces through the three-way compressive stress,which can be obtained more uniform deformation and complete pure magnesium extruded parts.关键词：SPH;Pure Magnesium;Equal Channel Angular Pressing;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Aimed at a series of bolt hole leakage in aluminum alloy cylinder head,the AnyCasting software was used to analyze the origination of the leakage problem,which was attributed to the generation of shrinkage porosities.According to the simulated results,the optimized schemes were designed such as cooling system optimization and product rounded corner structure optimization,and the feasibility of the modified scheme was verified by simulation analysis.The results show that,when the cooling opening time of side mold point is 50 sand waterjacket rounded corner is optimized to R7,the isolated liquid region at the leakage site basically disappears,then production verification was carried out with these schemes.The practical production reveals that the simulated results are highly consistent with the verification ones,and the product leakage rate is rapidly reduced from 3.5% to 0,which greatly reduces the cycle and cost.关键词：Numerical Simulation;Aluminum Alloy Cylinder Head;Shrinkage Cavity;AnyCasting
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发布时间：2023-12-18 - 摘要：The effects of thermal equilibrium method semi-solid slurry process on microstructure of A356 aluminum alloy were investigated.Special processing apparatus was designed,and orthogonal experiment of three factor to three levels was designed by taking melt pouring temperature,the outer diameter of heat pipe and the wall thickness of heat pipe as orthogonal factors.In addition,the orthogonal optimized parameters were verified by experiment.The results reveal that the factors affecting microstructure of semi-solid A356 aluminum alloy is presented as follows:the wall thickness of heat pipe,pouring temperature and the outer diameter of heat pipe.The optimal process parameters were obtained by orthogonal experiment,which was the pouring temperature of melt of 630℃,the outer diameter of heat pipe of 34 mm and the wall thickness of 1.1 mm.关键词：Thermal Equilibrium Method;Orthogonal Experiment;A356 Aluminum Alloy;Microstructure
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发布时间：2023-12-18 - 摘要：The AZ91D auto tire active safety device parts were prepared by semi-solid rheomolding process.Different types of fatigue cracks passivation and pore initiation were analyzed,and characteristics of the crack tip of fatigue crack in the semi-solid rheomolding AZ91D magnesium alloy auto parts were described,by"25 000 km road test of cars equipping with the sample parts"and"50 km road test of cars after sudden deflation of their tires".The results indicate that the passivation mechanism of the crack tips in semi-solid rheomolding AZ91D auto parts is characterized by the strain accumulation,and the passivation process presents asymmetric passivation.The plastic strain control mechanism is the key factor for the change of the position of the pore initiation before the crack tip.The change of the position of the pore initiation before the crack tip is the key factor for the fluctuation of the crack propagation path.关键词：AZ91D Magnesium Alloy;Semi-solid Rheomolding;Auto Part;Crack Tip;Characteristics
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发布时间：2023-12-18 - 摘要：In order to explore the effects of process parameters on LFC components,through setting vacuum degree,permeability rate of coating layer and casting modulus,gravity-exhaust capacity user model was established based on the Flow-3D redevelopment.The simulated result of vertical plate was analyzed comparatively with the experiment ones.The results reveal that the filling morphology and time of liquid metal based on the developed model are well agreement with experimental ones,which shows that the redevoped model based on the Flow-3D can simulate desirably the LFC process.关键词：Numerical Simulation;FLOW-3D;Lost Foam Casting;Redevelopment
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发布时间：2023-12-18 - 摘要：Aiming at the new-generation high-performance transmission housing,the mold flow analysis can predict effectively the manufacturing risk of the product and optimize the process design of the gating system.The robot can take parts automatically,which can reduce effectively labor intensity and improve production efficiency.Through the analysis and improvement of casting defects,the internal quality and appearance quality of the products were improved effectively,and the products were successfully batch of produced.关键词：Mold Flow Analysis;Mould Design;Automatic Pickup;Profile Extrusion Pin
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发布时间：2023-12-18 - 摘要：The die design of aluminum retail deep window wheel was described.The results indicate that shrinkage porosity and blowhole defects can be generated easily at up-window of deep window wheel during low pressure casting process,which serious affects quality and product yield.Therefore,aiming at the defects during low casting process,the die structure was optimized.Combined with the simulated results and production verification,it shows that the filling channel of molten aluminium can be increased directly in the middle of the die window.Aluminum alloy wheels with qualified quality were produced to meet the requirements of mass production.关键词：Deep Window Wheel;Die Design;Defect;Optimization
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发布时间：2023-12-18 - 摘要：The casting process was nalyzed for the structural and technical difficulties of VW63Z heat resistant rare earth-magnesium alloy cabin.The ProCAST software was applied to simulate the filling and solidification field of the casting process,and the origination of casting defect was described.Shrinkage porosity（holes）can be visualized at the hot spot of thick-large location and transition zone of thick wall of the cabin.Based on the simulated results,the casting parameters were optimized.The gating system composed of sprue,+shape runner and vertical cylinder slit gating presents stable filling effects with desirable feeding effects.Differential pressure casting can produce the qualified cabin.关键词：VW63Z Magnesium Alloy;Heat Resistant Rare Earth;Differential Pressure Casting
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发布时间：2023-12-18 - 摘要：It was analyzed for serious blade deformation caused by heavy stress in investment casting large-sized K435 gas tubine blade,and defects such as porosity,shinkage cavity and inclusion in solidification process.The deformation rate of casting profile was decreased through sectional wax mold calibration and sectional anti-deformation compensation of wax pattern.The gating system could realize sequentially solidified by wrapping aluminium silicate fiber to solve corresponding porosity at the junction between platform and airfoil and micro-porosity.The shell obsolescence,casting run-out and sand inclusion caused by sand loss could be avoided at deep socket of tenon by improving blade structure and shell making process.The waste rate of fluorescent slag inclusion of the casting can be reduced by improving wax assembling system and casting process parameters.These measures above can improve greatly acceptance rate of the blade.关键词：K435 Superalloy;Gas Turbine Blade;Deformation Control;Shrinkge Porosity;Sand Inclusion
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发布时间：2023-12-18 - 摘要：Aiming at the shrinkage defects often formed in production of thin-walled automobile investment castings,the solidification process of liquid metal was simulated by the ProCAST software.On the basis of the initial simulation,the process feeding channel was added to optimize the structure of the castings so as to obtain highquality castings,to shorten the development cycle of the products,to improve the internal quality of the castings and to reduce the trial-production cost of the products.关键词：Investment Casting;ProCAST;Numerical Simulation;Process Feeding
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发布时间：2023-12-18 - 摘要：The process for investment casting IN718 alloy turbine castings was simulated by the ProCAST software,and the temperature field during solidification process was visualized,and porosity shrinkage criterion was used to predict the position where shrinkage defects easily occurs.According to the simulated results,the gating system was modified,so the quality of turbine castings was improved.The castings produced by the improved process have no obvious absent defects under X-ray detection,and the relative density of the castings was reached up to 99.8%.关键词：IN718 Alloy;Numerical Simulation;Pouring Position;X-Ray Detection;Relative Density
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发布时间：2023-12-18 - 摘要：A coating reinforced with in situ synthesis of Ti3SiC2-TiB2 particulates has been fabricated successfully on the Ti-6Al-4V alloy by the low oxygen partial pressure fusing technique in the Al-Si-B4C powders system.The results reveal that the coating consists of two layers,that is the outer layer consists of high volume fraction of Ti3SiC2,TiB2 and the inner of TiAl3 and Al layer with the obvious layered distribution of phase composition.The role of aluminum is served as a diluent agent through decreasing the molar fraction of reactant in slurry,as a activator agent through promoting the coating formation,as a assistant agent through decreasing the reactive temperature for Ti3SiC2 formation,as a deoxidant agent through removing the oxygen in heating system,and as a stuffing agent through favoring the densification of coating during the coating fabrication.关键词：Composite;In Situ;Ti3SiC2;TiB2;Particulate
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发布时间：2023-12-18 - 摘要：Effects of 0.2% addition of C and Nb（in molar fraction）on phase structure,microstructure,tensile properties at room temperature and corrosion behavior of the CrMnFeCoNi high-entropy alloy were investigated.The results show that the CrMnFeCoNi alloy with annealed at 800,900 and 1 000℃ for 1 hafter microalloying,NbC is precipitated besides of the equiaxed crystal matrix of the face-centered cubic structure.With the annealing temperature decreases,the amount of precipitation of NbC is increased firstly and then decreased,and amount of precipitation reaches the highest at 900 ℃.The precipitation of NbC particles can refine the grains.After alloying,the grain size is decreases by 41%,46% and 9% at the above three temperatures,respectively.In addition,alloying can also increase the ambient yield strength and tensile strength of the substrate with a higher elongation,which is attributed to NbC precipitation strengthening and fine grain strengthening.The change of corrosion property in this paper is mainly attributed to the effect of NbC precipitotion and grain size.关键词：High-entropy Alloy;Carbide;Microstructure;Tensile Properties;Corrosion Behavior
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发布时间：2023-12-18 - 摘要：High-cycle fatigue performance analysis was carried out on a cast aluminum alloy AlSi9Cu3 steering column tube.Using the group method,the high cycle fatigue performance of the material was measured and the P-SN curve of the material was plotted.It is estimated that the fatigue strength of the material at a fatigue life of 106 times at 99% reliability reaches 120.7 MPa.Scanning electron microscopy（SEM）was used to observe the fatigue fracture of the specimens.The results reveal that fatigue source is composed of mostly pores and oxide inclusions.The type and size of the original defect can decrease the service life and increase the dispersity of fatigue life.关键词：AlSi9Cu3 Alloy;P-S-N Curve;Fracture Analysis;Casting Defect
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发布时间：2023-12-18 - 摘要：Effects of cooling rate and isothermal solid solution process on the morphology and volume fraction of grain boundary β phase in AZ91+1 SiC alloy were investigated by copper mould spray casting and subsequent isothermal solid solution to reveal its formation mechansim.The results show that the high cooling rate of spray casting can refine the grain size significantly in comparison with furnace cooling.The formation of supersaturated solid solution can reduce the solute segregation degree,which is beneficial to inhibiting the formation of β phase.With the decrease of inner diameter,the enhanced non-equilibrium effect leads to the further decrease of β phase.The volume fraction ofβphase with diameter of 2 mm is only 4.3%,reduced by 66.1% than that of ones with 8 mm in diameter.After isothermal treatment at 320 ℃ for 2 h,the volume fraction of β phase in quenched alloy with diameter of 8 mm is decreased to 9.1%.As the increase of holding time,its value is further reduced to 5.5% for 4 hand varied sliGHTly after 8 h.The amount ofβphase is decreased greatly with solid solution temperature increase,where a complete solution structure can be obserevd after holding at 400℃ for 2 hdue to the disappearance of β phase.关键词：Non-equilibrium Solidification;Magnesium Alloy;Cooling Rate;Grain Boundary Phase;Solution Treatment
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发布时间：2023-12-18 - 摘要：Internal defects such as porosity and shrinkage are generated easily in A356 aluminum alloy wheel during manufacturing process,and the separation of defect areas in X-ray inspection is always a difficult problem.An interactive analysis method for defect extraction from hub was presented by mathematical morphology top-hat transform preprocessing,mouse selection of target area and fixed threshold segmentation.The experimental results show that the proposed technical scheme is feasible and can meet the requirements of X-ray detection of internal defects in the wheel hub.关键词：Aluminum Alloy Wheel;Internal Defect Detection;Top-hat Transform;Threshold Segmentation;Inter-active Analysis
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发布时间：2023-12-18 - 摘要：The surface of a sand core prepared by triethylamine cold box core-making technique was coated with a kind of special coating containing an oxidizing agent Na2Cr2O7,and then the coated core was assembled in the mold and a reaction could be observed when the alloy melt entried the mold,Then an oxide layer of about 2μm on the surface of the aluminum alloy was generated,which improved greatly the corrosion resistance of the sample.The morphology and corrosion resistance of the oxide layer were investigated using SEM and electrochemical impedance spectroscopy.The results reveal that with the same rate of pouring,as the thickness of the sample increase,the thickness of the oxide layer is increased.With the increase of the height of the sample,the thickness of the oxide layer is reduced along the heiGHTdirection.During using internal oxidation treatment,a faster casting speed should be adopted to ensure that the aluminum liquid reacts with the coating as soon as early.关键词：In-Mold Oxidation Treatment;Dimension of Casting;Corrosion Resistance
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发布时间：2023-12-18 - 摘要：Porosity appears easily around double ring at the head of conductor,and possible defect origination was analyzed.The optimized process was presented based on the simulated results of the Magma soft,which was verified by the practical production.The waste rate was decreased from 12% to 2%,decreasing greatly manufacture costs.关键词：Al Alloy;Porosity;Magma Soft
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发布时间：2023-12-18 -
Microstructure Evolution of TC21 Titanium Alloy after Superplastic Compression by Multiple Annealing
摘要：The effects of superplastic compression deformation and multiple annealing heat treatment on microstructure evolution of TC21 titanium alloy were investigated.The results reveal that the number of large deformation zoneα-phase transferred to metastableβphase is more than that free deformation zone at superplastic compression deformation in the two-phase region.When deformed in theβsingle-phase region,theβ-phase grain size is increased with the deformation temperature increase.After the double annealing under the same deformation condition,although the size of the precipitated acicularαphase is increased with the increase of the annealing time,the formed basket structure is more interwoven.The basket structure formed by triple annealing is finer than that of ones by double annealing,and the second heat treatment temperature is lowered,so the size of the precipitated acicularαphase can be reduced remarkably.It is found that with the increase of superplastic deformation temperature,the size of the precipitated acicularαphase is increases continuously regardless of double annealing or triple annealing,indicating that the deformation temperature before annealing has a significant effect on the microstructure after annealing.关键词：TC21 Titanium Alloy;Superplastic Compression;Annealing;Microstructure- 2
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发布时间：2023-12-18 - 摘要：Effects of Sr,Y and compound treatment of Sr-Y on the solidification structure and mechanical properties of the Mg-9 Al-3Si alloy were investigated,and effects of different Y content on the solidification structure and mechanical properties of the alloy after compound treatment were also analyzed.The results show that the solidification structure and mechanical properties of the alloy can be improved obviously with Sr-Y composite modification,and the modification effect superior to that of one with Sr or Y alone.The size of primary Mg2Si phase is decreased by 40%,and the tensile strength and elongation of the alloy are increased by 31.2% and 300%,respectively,compared with those in untreated alloys.Under compound modification condition,with the increase of Y content,the size of primary Mg2Si phase is decreased firstly and then increased,where the turning point is0.78%.Meanwhile,the mechanical properties of the alloy are corresponded basically to the size change of primary Mg2Si phase.关键词：Mg-9Al-3Si Alloy;Compound Modification;Solidified Structure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The microstructure evolution of the Cu/Sn-58Bi/Cu solder joints with 10μm bump heiGHTunder a temperature gradient of 2 000℃/cm and aging at 125 ℃for different time were investigated,respectively.The results reveal that Bi phase is firstly coarsened and then segregated to the cold end with TM time increase,and then formed a nearly continuous Bi layer at the cold end after TM 800 h.Meanwhile,the intermetallic compounds（IMCs）are grown nearly symmetrically and slowly at the solder joint interface.However,during aging process,the interfacial IMCs are grown rapidly toward the center of the solder joint,resulting in a uniform and continuous Bi layer generation.After Sn phase is consumed completely at aging for 200 h,the Cu6Sn-5 in IMCs is gradually transformed to Cu3 Sn.By comparing the above experimental results,it is found that Bi phase in the solder joint can inhibit asymmetric growth and reduce the growth rate of the interfacial IMCs under TM condition,which reveal that the Bi addition in the solder alloy can improve the service reliability of micro solder joint.关键词：Thermomigration Effect;Sn-58Bi Solder;Micro-solder Joint;IMCS
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发布时间：2023-12-18
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