最新刊期
卷 ， 期 1 ， 2007
- 摘要：自本期开始,本刊“艺术铸造”专栏开辟《中国艺术铸造系列图说》,每期一器,简介其文化、艺术和科技方面的特色,俾使业内同仁能比较系统地感悟中国古代艺术铸造的博大精深。
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发布时间：2023-12-18 -
- 摘要：Magnesium/aluminum laminated composites were fabricated by diffusion bonding method,and interfacial characteristics were measured by nano-indentation to know how to improve the interfacial properties of heat treated composites.The results reveal that laminated composites with desirable bonding can be prepared by the diffusion bonding with three sets of processing parameters,including 400 ℃/30 MPa/10 min,400 ℃ /40 MPa/10 min,400 ℃/30 MPa/20 min,however,the diffusion layer is not visible in the condiions of 400 ℃/30 MPa/10 min.Diffusion layer thickness of the composites can be remarkably increased with heat treatment,and nano-hardness of diffusion zone is 3 times higher than that of the matrix,and the Young’s modulus is located in the range of that of magnesium alloy and aluminum alloy.关键词：Magnesium/aluminum Laminated Composites;Interface;Nano-indentation;Diffusion Bonding
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发布时间：2023-12-18 - 摘要：A nonlinear model was developed to describe the relationship between tensile ductility and constituents in micron scale as well as dispersoids in sub-micron scale in aluminum alloy based on the formation of various-sized micro-cracks during deformation.The model prediction agrees well with the experimental data.Effects of the volume fraction and size of the various-sized constituents and dispersoids on tensile ductility of aluminum alloy can be quantitatively analyzed by means of the model.Meanwhile,measures of improving tensile ductility of aluminum alloy were taken based on the simulated results.关键词：Aluminum Alloy;Tensile Ductility;Model;Deformation and Crack
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发布时间：2023-12-18 -
- 摘要：The effects of minor Ag addition on the heat-resistant properties of Al-5.3Cu-0.8Mg-0.5Mn-0.5（Zr+Ti）alloy have been investigated by tensile testing and transmission electromicroscope（TEM）.It is revealed that the ambient strength and heat-resistant properties of the alloy can be improved greatly as a result of changing the aging process of the alloy with Ag addition.The strengthening precipitates in the alloy containing Ag is composed of coherent laminate Ω phase and a small amount of θ’ phase with peak aging at 185 ℃.Strengthening mechanism of minor Ag addition is attributed to the precipitating hardening of Ω phase,and the improvement of heat-resistant properties of the alloy is a result of higher thermal stability of Ω phase than that of θ’ phase.关键词：Aluminum Alloy;Microalloying;Heat-resistant Properties;Microstructure
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发布时间：2023-12-18 - 摘要：Effects of hydrogen content in liquid magnesium,sample thickness and degassing ways on micro-porosity in magnesium alloy have been investigated by quantitative hydrogen-measuring and quantitative metalography methods.The results show that micro-porosity in the magnesium alloy in the condition of the flux covering is more than that of the ones in the condition of inertial gas protection.With increasing in parts thickness,the micro-porosity in the magnesium alloy parts is increased with the same hydrogen content.Micro-porosity in the magnesium alloy can be reduced remarkably after Ar-degassing with flux protection,which obviously improves the tensile strength by 25% and the elongation by 50% compared with the parts without Ar-degassing treatment.关键词：Cast Magnesium Alloy;Micro-porosity;Hydrogen Content;Degassing
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发布时间：2023-12-18 - 摘要：Effects of different casting-infiltration ways on thickness and quality of Si-Fe compound layer on cast steel part surface have been conducted.Microstructure,constituent and properties of Si-Fe compound layer were determined by SEM（scanning electromicroscope）,EDS and micro-hardness tester.Desirable cast-infiltrated Si-Fe compound surface with 0.53.3 mm in thickness can be obtained on the cast steel parts surface with pouring temperature at about 1 560 ℃ for liquid steel.In addition,the bonding mechanism of cast-infiltrated Si-Fe compound layer with matrix exhibits sawtooth-like metallurgical bonding.关键词：Cast-infiltration;Cast-infiltrated Si-Fe Compound Layer;Interfacial Bonding
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发布时间：2023-12-18 - 摘要：Effects of TEMHD on the microstructure of directionally solidified Al-4.0Cu alloy have been investigated by an optimized self-developed Bridgman directional solidification installation with a transverse direct current steady-state magnetic field.Microstructure is converted from typical dendrite to cell as the increase of magnetic induction intensity from 0 to 0.15 T with a tow-rate of 20 μm/s,50 μm/s,100 μm/s,200 μm/s,respectively The phenomenon was understood based on TEMHD and MHD（magnetic hydro-dynamic）effects.关键词：Steady-state Magnetic Field;TEMHD;Directional Solidification;Primary Dendritic Arm Spacing
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发布时间：2023-12-18 - 摘要：Thermal deformation behavior of 6063 aluminum alloy produced with fine grain aluminum ingot at a high temperature has been observed with Gleeble 1 500 dynamic materials test machine.The results reveal that the deformed 6063 aluminum alloy has higher aging hardness with solid solution plus homogenized treatment at 250 ℃ for three hours due to reducing rheological stress.Low temperature and slow-speed deformation can decrease the rheological stress of the treated alloy sample,however,it can be harmful for the dissolution of Mg2Si phase,which obviously affects the aging hardness of the deformed alloy.The rheological stress of the deformed alloy can be increased with the increase of Mg2Si phase in the sample with the same homogenized treatment.The effects of refining ways and variation of Ti content in the deformed alloy on thermal deformation behavior can be ignored.关键词：6063 Aluminum Alloy;Fine Grain Aluminum Ingot;Thermal Deformation
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- 577
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发布时间：2023-12-18 - 摘要：Mg 65 Cu 22 Zn3Y5Nd5 bulky amorphous alloy was prepared in a traditional Cu mould in atmosphere condition.The structure,glass transition,crystallization and melting behavior of the amorphous alloy were investigated by XRD（X-ray diffusion）and DSC(differential scanning calorimetry.The results show that amorphous alloy strip with maximum 4.5 mm in thickness can be obtained with △Tx（undercooling liquid zone temperature）of 51.3 K and T rg（approximately glass transition temperature）of 0.59.Mg 65 Cu 22 Zn3Y5Nd5 bulky amorphous alloy exhibits a more complex crystallization process,which performed through three steps,compared with the alloy free Zn.With the isothemal treatment,the Mg 65 Cu 22 Zn3Y5Nd5 bulky amorphous alloy is converted from amorphous alloy into the crystal state where the sharp crystal peaks superimpose on the simple amorphous peak.The structure of the alloy becomes more homogeneous and finer with annealing step by step.关键词：Bulky Amorphous Alloy;Crystallization Treatment;Microstructure
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发布时间：2023-12-18 - 摘要：A finite element model has been established to simulate the influence of thermo-properties of mould on temperature distribution in powder,punch and die during electric current sintering.Simulated results indicate that the thermo-properties of the die have great effects on temperature distribution during electric current sintering.Compared with using conventional graphite material as die,ceramic materials with high electric resistance and low heat conductivity can significantly improve the temperature-increment rate and completed-sintering temperature of the powder in case of the same sintering parameters,but can result in the obvious temperature-gradient effects.The experiment for electric current sintering pure Ti is accordant with simulated ones.关键词：Electric Current Sintering;Temperature Field;Finite Element;Powder Metallurgy
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发布时间：2023-12-18 - 摘要：The origination and location of shrinkage porosity（hole）in the rudder horn was described by simulating the filling process of large pelagic cast-steel rudder horn using a CAE software.The complete structure with defects-free can be realized by optimizing process and rationally assembling riser and chill to ensure the directional solidification and effective feeding of melt.关键词：Rudder Horn;CAE Software;Casting Defects;Processing Optimization
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发布时间：2023-12-18 - 摘要：It is important for determining fading time of inoculating agent to rationally choose the process way and to improve the casting quality.A mathematical model for calculating fading time of inoculating agent was built up based on the heterogeneous nucleation theory,in which the formula was given.The results show that the fading time is in inverse relation with the diffusion coefficient of the solute in effective nucleation phase in the inoculating agent,and is relative to the radius of effective nucleation phase and solute concentration in the phase.The mathematical model was verified by an experiment,which shows the calculated results is well in agreement with experimental ones.关键词：Fading;Heterogeneous Nucleation;Solute Diffusion;Mathematical Model
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发布时间：2023-12-18 - 摘要：By using self-developed wave-like sloping plate,semi-solid billets with sound microstructure and excellent thixoforming property have been prepared in the condition of the cooled sloping plate.While the sloping plate was heated,semi-solid slurry with good microstructure has been prepared.During preparing semi-solid alloy by using wave-like sloping plate,the co-action of the exploration of nucleation in the whole melt with the dendrite broken results in the formation of fine spherical microstructures in the semi-solid alloy,and casting temperature,cooling rate,sloping angle and the materials of the sloping plate are dominant in the formation of microstructure of semi-solid alloy.The pouring temperature ranges of preparing semi-solid billets for AlMg3 and AlSi6Mg2 are 660690 ℃ and 660680 ℃,respectively.AlSi6Mg2 semi-solid slurry with good microstructure can be prepared with pre-heating temperature at 300 ℃ for sloping plate and pouring at 680 ℃.关键词：Sloping Plate;Wave-like;Semi-solid;Aluminum Alloy;Microstructure
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发布时间：2023-12-18 - 摘要：Electrolytic Al-Si alloy（EASA）is characterized by self-modified structure in the castings,where Si particles and iron or Ti-bearing phase exhibit fine structure with a large amount of primary aluminum dendrite.The structure in self-modified state is relatively insensitive to cooling rate during solidification process,and is inherited upon repeated remelting,exhibiting excellent toughness and plasticity.Self-modification in EASA is attributed to the occurrence of a severe undercooling during solidification,which is related with the formation of homogeneous melt and the electric current in electrolysis process.关键词：Electrolytic Al-Si Alloy;Modification;Undercooling;Inheritance
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发布时间：2023-12-18 - 摘要：The last progress in application and development of wrought magnesium alloy,and in plastic deformation characteristics and working technologies has been described.The developing tendency of wrought magnesium alloy has been reviewed.关键词：Wrought Magnesium Alloy;Plastic Deformation;Squeezing Casting;Rolling;Forging;Sever Plastic Deformation
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发布时间：2023-12-18 - 摘要：Dynamics and creation of p-Q2 diagram in diecasting were expounded based on the hydrodynamic theory.p-Q2 diagram design system was developed by means of C++ program.The system can calculate available scope of p and Q to provide an evaluated reference for design of gating system with a given parameters of die and presser.关键词：Die Casting;Gating System;p-Q2 Diagram
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发布时间：2023-12-18 - 摘要：It was validated that p-Q2 diagram relationship between the feed oil circuit and the return oil circuit of the shot end system of the die-casting machine is accordant based on p-Q2 diagram principle.Relationship between p-Q2 diagram of die casting die and the shot end system was expounded,and simulated ways for trial-die were described using p-Q2 diagram,in which the evaluation and modification of flow coefficient were considered.The practical validation of p-Q2 diagram has been conducted by producing cylinder using Buhler machine.
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发布时间：2023-12-18 - 摘要：The improvement of casting process was conducted to eliminate the defects in F3 cylinder cap in low pressure casting.Sand-adhesion was avoided by brushing fine and sound coating on sand-core surface in exhausted channel and altering set-ways of sand-core.Shrinkage porosity（hole）in thick-walled complex parts can be eliminated by chilling method.Meanwhile,it is an effective way to resolve shrinkage porosity in thick partial location by adopting directional solidification and setting feeding channel.关键词：Low Pressure Casting;Cylinder Cap;Gas Hole;Shrinkage Porosity;DOE
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发布时间：2023-12-18 - 摘要：Highly polymerized compound pattern-materials in SLS pattern is un-favorable for dewaxing and easily generating entrapped-slag in the investment castings due to high melting point and high viscosity.The pattern-materials properties in SLS pattern has been investigated,including melt viscosity temperature of 160180 ℃,100 Pa s melt viscosity temperature of 230 ℃,initial decomposed temperature of 310.48 ℃ and fully decomposed temperature of 476 ℃ as well as ash content of 0.307%.Based on the pattern-materials properties,the process of designed shell-making and dewaxing is as follows:majority wax-materials is removed at about 250280 ℃,then the residuals are burned off at 500700 ℃.The sequence of dewaxing should be considered in the practice due to the pattern always assembled with simple parts and gating system with low melting point wax and SLS wax.The low melting point wax pattern is firstly dewaxed at a lower temperature,then SLS pattern is dewaxed at a higher temperature.Entrapped-slag in the investment castings can be eliminated by setting exhausted riser and exhausted-slag riser in concave and slag-collection position of pattern to fully remove wax based on analysis of origination of entrapped-slag in SLS pattern complex parts.Exhausted pipe in the car and large stainless steel pump wheel in investment casting have been successfully produced by using above-mentioned technology,realizing desirable effects.关键词：Rapid Prototyping;SLS;Investment Casting;SLS Pattern;Wax Properties
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发布时间：2023-12-18 - 摘要：The precision steel castings were produced with nitrogen（N2）or propane gas（C3H8）filling the shell mold before and after pouring liquid steel in case of sand-free.The microstructure was observed and the micro-hardness of the castings was measured on a type HXD-1000 micro-hardometer.The reason resulting in the relief of surface decarborization in the precision steel castings has been approached with protection gas.The results show that although both the N2 and C3H8 can effectively relieve or prevent surface decarborization in precision steel castings,C3H8 exhibits better prevention-decarborization effects.Surface decarborization in precision steel castings can be effectively eliminated as a result of removing the air in the shell mold.关键词：Precision Casting;Cast Steel Castings;Surface Decarborization;Gas Protection
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发布时间：2023-12-18 - 摘要：Developing status of small-middle typical enterprises from lost foam casting,such as Citation Foam,Irish Foundry and Mueller in the U.S.A was described,focusing on multi-functional support bracket,variance-speed housing from Citation Foam and aluminum alloy pin,cast aluminum sprayed nozzle from Irish Foundry to exhibit the advantages of lost foam casting.The process of producing valve body at the Muller was introduced in detail from selection of foamed materials and coating and raw sand,set of processing parameters,design and optimization of gating system and pouring temperature.关键词：Lost Foam Casting;Typical Sample;Enterprises
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发布时间：2023-12-18 - 摘要：Based on the analysis of the characteristics of hypoeutectic Al-Si alloys melt structure and physical properties of Al,Si,Ti and Sr,effects of refinement and modification on melt structure of the alloy have been investigated with electron theory.In hypoeutectic Al-Si alloy melt,refinement and modification can be described to the interaction of Al with Ti and Si with Sr,respectively,which can waken heterogeneity of melt structure,and not only improve melt structure,but also restrain the fading of each other.关键词：Hypoeutectic Al-Si Alloy;Melt Structure;Refinement;Modification
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- 482
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发布时间：2023-12-18 - 摘要：Effects of content and morphology of iron phase in eutectic Al-Si alloy have been investigated by optical microscope（OM）,universal material testing machine and XRD（X-ray diffusion）.The composition and microstructure of iron phase and the distribution of iron element in the alloy have been observed by SEM and energy spectrum analysis.The experimental results reveal that with the increase of Fe content,the tensile strength and elongation of the alloy are decreased gradually,in which the tensile strength and elongation are sharply descended with about 1% Fe content.The tensile strength of the alloy containing high Fe content can be improved by 180% with adding Mn to a given Fe/Mn ratio,which is contributed to the transformation of needle-like Fe phase from bulky and Chinese script Fe phase.关键词：Eutectic Al-Si Alloy;Iron Phase;Microstructure and Mechanical Properties
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发布时间：2023-12-18 - 摘要：Nano-hydroxyapatite-titanium（nHA-Ti）composite powder was prepared by mechanical milling in alcohol media.Phase constituent and microstructure of the composite powder during mechanical milling have been observed by XRD（X-ray diffusion）,SEM（scanning electron microscope）and EDS（X-ray energy dispersive spectrometer）,and homogeneity of the composite powder has been analyzed by EPMA（electron probe X-Ray microanalysis）.The results show that the powders of Ti/HA are fined to a nano-scale with increasing in milling time.The nano-composite powders with fine structure has been prepared,in which the nHA particles embedded in the larger Ti particle,after milling for 30 min with the wet-milling.Furthermore,it can be found that the nHA would be distributed more homogeneously.关键词：Mechanical Milling;nHA-Ti Composite Powder;Biocomposites
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发布时间：2023-12-18 - 摘要：Effects of B-modification and holding time after modification on the microstructure and mechanical properties of HPb59-1 brass were investigated.A certain amount of element B addition can improve the mechanical properties of the HPb59-1 brass,which is as a result of refining microstructure of the HPb59-1 brass and changing the distribution of α and β phases in the microstructure.Refinement can be improved with increasing in element B addition,in which the desirable refinement can be observed with adding B content in range of 0.008% to 0.015%.Modification effects of element B is fade with extending holding time,where desirable modification effects can be obtained with holding time for 10 min.关键词：HPb59-1 Brass;Microstructure;Properties;Refinement and Modification;Fading
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发布时间：2023-12-18 - 摘要：Te was used to replace Cr in Cu-Zr-Cr alloy to prepare the Cu-Zr-Te alloy,which can avoid the harm of Cr 6+.The morphology and constituent of precipitates in two kinds of aged Cu-Zr-Te alloy have been analyzed by SEM and EDM,and effects of aging treatment on electric performance and mechanical properties of the Cu-Zr-Te alloy have been investigated.The results show that the alloy materials after solid solution and cold-deformation can possess excellent mechanical properties and electrical conductivity with holding time for 60 min at 500 ℃.关键词：Cu-Zr-Te Alloy;Aging Treatment;Precipitating Strengthening
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发布时间：2023-12-18 - 摘要：Effects of Bi on microstructure and properties of Se-Bi brass have been investigated by microstructural analysis and tensile fracture observation.The results show that single Bi is distributed in the boundary of α phase and β phase,sharply affecting the castability of the Se-Bi brass.Particle Bi phase is distributed on the phase boundary with Bi content less than 1.0%,and the bulky Bi phase is distributed on the boundary with about 2% Bi content,moreover,continuous film occurs in the boundary with Bi content more than 2.5%.The segregation mechanism of Bi was approached based on thermo-kinetics analysis.关键词：Solidification Behavior;Cut-free;Continuous Film;Brass;Bismuth
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发布时间：2023-12-18 - 摘要：Interfacial morphology and bonding strength of cast Cu stave with inner cast steel pipe have been analyzed under the conditions of air and cooling agent with 15 t/h,13 t/h and 11 t/h,and atom diffusion in the interface of Cu stave with inner cast steel pipe has been observed by electron probe machine analysis（EPMA）.The results reveal that interfacial bonding of Cu-Fe becomes worse and worse with increasing cooling rate,exhibiting great importance for interfacial morphology.Bonding strength of Cu-Fe can be up to 160 MPa in air as a result of full atom diffusion each other,which creates about 100 μm diffusion zone,to form a desirable metallurgical bonding interface.关键词：Cooling Stave;Cast Copper;Bonding Strength;Blast Furnace
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发布时间：2023-12-18 -
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