最新刊期
卷 30 ， 期 6 ， 2010
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- 摘要：Effects of pouring temperature,rotating velocity of inner barrel and shearing temperature on microstructure of semi-solid A356 aluminum alloy slurry which was prepared by self-developed TBR machine were investigated. The results indicate that it is favorable to obtain semi-solid aluminum alloy slurry structure with fine and spherical solid particles uniformly distributed in the eutectic matrix by reducing pouring temperature,increasing rotating speed of inner barrel or decreasing shearing temperature appropriately. The desirable microstructure of semi-solid A356 aluminum alloy with average primary solid phase diameter of 41 μm and shape factor of 0.89 can be observed with pouring at 660℃ and rotating inner barrel at 500 r/min as well as shearing at 590℃ .The formation of the semi-solid microstructure is controlled by the co-action effects of fragmentation and inhibited growth of dendrite.关键词：TBR;Semi-solid;A356 Aluminum Alloy;Microstructure
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发布时间：2023-12-18 - 摘要：TiB2/Al-4.5Cu composites were fabricated by KBF4/K2TiF6 mixed salts reaction in Al-4.5Cu molten metal. Solidification structure and solid solution-ageing properties of the prepared composites were investigated by XRD （X-ray diffraction）,optical microscope （OM）,elemental analyzer and Vikers hardness tester. The results show that the solidification structure of the composites is refined apparently,and the hardness is obviously increased with TiB2 particles addition. The hardness of TiB2/Al-4.5Cu composites with 6.9% TiB2 in volumetric fraction which is treated by T6 is improved by 100% compared with that of Al-4.5Cu matrix alloy. The solid solution process of the composites is restrained,while the ageing process is accelerated by TiB2 particles.关键词：In-situ;Aluminum Matrix Composites;Microstructure;Solid Solution and Ageing
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发布时间：2023-12-18 -
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- 摘要：Effects of pulsating water method and conventional casting on the butt curl phenomena of the aluminum ingots with the size of 400 mm in width and 1320 mm in length were investigated comparatively. The butt curl deformation reaches up to 52 mm and 512 mm in the aluminum alloy ingot produced by conventional casting and by pulsating water,respectively,in condition of casting temperature of 720℃,casting velocity of 3565 mm/min and cooling water of 2050 m3/h. The decrease of butt curl is attributed to the fact that pulsating water decreases the cooling rate of the ingot resulting in the decrease of the temperature difference between the ingot center and surface,which reduces the torque moment induced by tensile stress and improves the rigidity of the bottom shell.关键词：Pulsating Water Cooling;Semi-continuous Casting;Butt Curl
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发布时间：2023-12-18 - 摘要：Matrix microstructure and section sensitivity of HCC gray iron bars with diameters of 185 mm containing A type graphite or D type graphite were investigated by adding trace antimony. The results reveal that trace Sb addition can greatly increase the content of pearlite in the microstructure of gray iron matrix containing A type graphite or D type graphite,which is favorable for the increase of cross section hardness and tensile strength and the decrease of difference in cross section hardness as well as improvement of section sensitivity.关键词：HCC;HCC Gray Cast Iron Bars;Section Sensitivity
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发布时间：2023-12-18 - 摘要：Shrinkage porosity （hole ）in the investment casting Ti-47Al-2Cr-2Nb alloy blade was predicted by the ProCAST software. The simulated results were well in agreement with experimental ones,showing the reliability and precision of the software. Shrinkage porosity （hole） defects in the blade could not totally be eliminated by only feeding effect of riser. Effects of some ways,such as bottom copper plate and mold shell preheating,mold longitudinal gradient temperature and whole mold shell preheating,on elimination of shrinkage porosity （hole） in the blade were simulated comparatively. The results show that the whole mold shell preheating method is an ideal selection for totally eliminating shrinkage porosity （hole） in the blade with preheating up to 1000℃.关键词：ProCAST Software;TiAl Blade;Shrinkage Porosity （Hole）;Prediction;Processing Optimization
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发布时间：2023-12-18 - 摘要：The spinning forming process of aluminum alloy cylindrical workpieces was simulated numerically by the Deform-3D software. Optimized processing parameters were presented including spinning temperature of 20 ℃ ,main axle rotating velocity of 400 r/min and 50% reduction of wall-thickness as well as feeding rate of 0.75 mm/r through simulation with varied parameters. Meanwhile,stress and strain distribution in workpieces deformed zone were simulated with the optimized parameters. The results show that maximum value of equivalent stress and equivalent strain can be observed in the contacted zone of blank with spinning wheel. Spinning force is mainly exhibited as exerted force at axial direction.关键词：Aluminum Alloy;Spinning;Numerical Simulation;Deform-3D
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发布时间：2023-12-18 - 摘要：The stress-strain curves of AZ31 magnesium alloy were mapped by the Gleeble-1500D hot simulator. ECAE process for AZ31 magnesium alloy was simulated by the DEFORMA-3D software to understand effects of different internal fillet radiuses on stress and strain. The results reveal that with increasing in the internal fillet radius,the surface of the sample becomes smooth,and average stress in internal fillet is decreased with average equivalent strain increase,while the middle steady deformation zone becomes smaller.关键词：ECAE;AZ31 Magnesium Alloy;Internal Fillet Radius;Numerical Simulation
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发布时间：2023-12-18 - 摘要：It is a difficult problem how to smoothly visualize the binary finite differential data during the post processing of casting CAE system. A mathematical model is proposed to reconstruct these data to be a continuous implicit function based on the Hamilton-Jacobi equations,which is independent of information of the original STL geometry and numerical simulation while it is only related to the underlying geometry represented by the finite differential data. Meanwhile,an efficient fast sweeping method is presented to solve the model. The solving process is parallelized with OpenMP language. The results reveal that the presented method can be used to effectively reconstruct arbitrary complex binary finite differential data and then realize smooth visualization. In addition,the model can be also used to reconstruct the continuous finite differential data.关键词：Casting CAE;Post Processing;Binary Finite Differential Data;Smooth Visualization;Hamilton-Jacobi Equation;Fast Sweep Method
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发布时间：2023-12-18 - 摘要：The gravity casting process for heat resistant Mg-RE alloy piston was simulated by the Anycasting software. Temperature field distribution during the filling and solidification process were simulated,and various potential defects which occured in the casting process were visualized. The simulated results are well in agreement with the practical ones. It is found that oxide inclusion easily appears in the piston head,and the shrinkage porosity （hole） easily occurs near junction location between piston body and feeding head.关键词：Heat Resistant Mg-RE Alloy;Casting Piston;Numerical Simulation;Defects
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发布时间：2023-12-18 -
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- 摘要：Mechanical properties of different positions in the solid solution treated low pressure casting A356.2 aluminum alloy wheel,which is treated by artificial ageing,natural ageing for 24 h and natural ageing for 48 h were measured,respectively,and mechanical properties of the finished product were tested and analyzed comparatively. The results reveal that compared those of T6 treated ones,yield strength,tensile strength and hardness of T4 treated （natural ageing for 48 hours） alloy wheel are decreased by 20%30%,by 5%10% and by 10%20%,respectively,while elongation is increased by 70%100%. However,the tensile strength,yield strength and hardness of the alloy after baking are increased to some extent with the slight decrease of elongation. Aiming at the index of mechanical properties,the T4 treated （natural ageing for 24 hours） alloy can meet the requirements compared with T6 treated ones.关键词：A356.2 Aluminum Alloy;Wheel;T4 Heat Treatment;T6 Heat Treatment;Mechanical Properties
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发布时间：2023-12-18 -
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- 摘要：Effects of input voltage,stirring temperature,cooling ways and extruded temperature on microstructure of semi-solid ZA27 alloy prepared by electromagnetic stirring and isothermal extrusion were analyzed to obtain optimized processing parameters. The results reveal that nearly fine spherical or spherical grain can be observed in the microstructure of semi-solid ZA27 alloy with stirring at 465475 ℃ and input voltage of 180200 V in condition of quenching. Grain size becomes finer and more uniform as a result of occurrence of dynamic recrystallization during extruding process at 390410℃.关键词：Semi-solid Forming;Electromagnetic;Isothermal Extruding;Microstructure;Dynamic Recrystallziation;Processing Parameters
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发布时间：2023-12-18 - 摘要：通过对低压铸造A356.2铝合金轮毂固溶后再分别进行人工时效、自然时效24、48h,然后做力学性能检测,并对经过涂装后的成品进行力学性能检测和对比分析。结果表明,T4（自然时效48h）热处理后比T6热处理后的屈服强度降低了20%～30%、抗拉强度降低了5%～10%、硬度降低了10%～20%,伸长率提高了70%～100%,但经过涂装烘箱烘烤后,合金伸长率有所下降,强度、硬度有所提高。T4（自然时效24h）热处理后比T6热处理后更能满足所需力学性能要求。关键词：A356.2铝合金;轮毂;T4热处理;T6热处理;力学性能
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- 470
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发布时间：2023-12-18 - 摘要：Due to the flow behavior of metal melt affected by the back pressure from residual gas in the mould during high pressure die casting （HPDC） process,the back pressure conditions should be considered in order to simulate the filling process precisely. Filling process of an aluminum alloy filter for automobile in HPDC was simulated by introducing back pressure conditions,and the simulated results were well in agreement with actual ones. The modified design was conducted based on the simulated results. The defects in the castings can be effectively eliminated by adjusting the position of the vents to change the back pressure in local cavity and then to affect the filling distribution of liquid aluminum alloy.关键词：Back Pressure in Cavity;HPDC;Gas Hole;Numerical Simulation
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发布时间：2023-12-18 - 摘要：There exist different die casting defects in different aluminum alloy castings with obviously different size and structure which are formed in one die during die casting process. Originations of different defects were analyzed by taking into account for pouring,processing parameters and die design,and modified countermeasures were presented. Practical production verifies that the confliction of shooting parameters should be avoided as possible in die casting parts with large difference in size in one die. It is the key parameters for obtaining high quality die casting parts by balancing die temperature.关键词：Die Casting;Die;Defects
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发布时间：2023-12-18 - 摘要：Aiming at the features of cylinder castings which exist flange around the cylinder parts and rectangle or arc grooves in the inner wall as well as flange on the ends of rectangle grooves,the die casting die with twice cavity parting for snapping slag in the gate and inside core-pulling by angle slides was designed. The die adopts gating system with ring gate,limit-distance mechanism,twice cavity parting to snap slag mechanism and inside core-pulling mechanism. The slag was automatically snapped by open force in cavity parting,and inside core-pulling by angle slides was realized in the ejection,so the problems were solved during the inside core-pulling,ejection and snapping. The mould exhibits compact in structure,convenient in operation and excellent in filling,realizing the smooth ejection and meeting the requirements.关键词：Twice Cavity Parting;Angle Slide;Limit-distance Plate;Die Casting Die
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发布时间：2023-12-18 - 摘要：Due to the inappropriate selection of processing parameters,defects such as shrinkage porosity,cracks and deformation often occurs in investment casting thin-walled and complex parts,decreasing the casting production rate. Aiming at features of amounts of processing parameters to be dealt with in investment casting and their interaction,the FEM （finite element method） was used to simulate filling process to understand effects of different parameters on filling process and to predict potential defects and then to optimize design. The temperature field and stress field in solidification in vestment casting shredding mills was simulated by the ProCAST to observe the effects of filling velocity on quality.关键词：Investment Casting;Numerical Simulation;Filling Velocity
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发布时间：2023-12-18 - 摘要：The majority of gas hole in investment casting carbon steel parts belongs to reactive gas hole,which is originated from the oxidation-reduction reaction between carbon and FeO. Measures of controlling the reactive gas hole were presented,including rational gating system and controlling pouring temperature,enhancing furnace discharge management.关键词：Gas Hole;Carbon Steel Parts;Investment Casting
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发布时间：2023-12-18 - 摘要：The trial-production of stainless steel valve by lost foam casting was described,including selection of pouring position,design of gating system,pattern assemble,coating brushing,pouring and process control.关键词：Lost Foam Casting;Stainless Steel Valve;Valve Body
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发布时间：2023-12-18 - 摘要：Effects of solid solution,ageing on microstructure and properties of as-extruded electromagnetic continuous casting AZ61 billets were investigated. The results show that properties of the electromagnetic continuous casting AZ61 magnesium alloy billets are greatly improved as a result of obvious refinement of grain size by extrusion. Absence of β-Mg17Al12 phase in as-extruded EMC AZ61 magnesium alloy can be observed. Grain size becomes coarse in the as-extruded ingot after solid solution. After ageing treatment,discontinuous and continuous precipitated β-Mg17Al12 phase appears in the alloy again,which results in the improvement of tensile strength and hardness to some extent and slight decrease of elongation.关键词：AZ61 Magnesium Alloy;Solid Solution;Ageing;Extrusion;Electromagnetic Field
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发布时间：2023-12-18 - 摘要：WC/cast steel surface composites were prepared by lost foam casting-infiltration technology. Composition of wear resistant coating during cast-infiltration was analyzed. The results reveal that the desirable wear resistant coating is composed of 55%65% WC particle （grain size of 0.34 mm）,8% Cr-Fe,1% additive and 26%36% EPS particle. The Brinell hardness of infiltrated layer was examined,and wear resistance of the coating layer was tested on ML-100 attrition machine. The results indicate the hardness and wear resistance of the infiltrated layer are 1.7 times and over 2.8 times higher than those of the matrix,respectively. Through composition analysis and microstructural observation,the improvement of hardness and wear resistance of infiltrated later was described.关键词：Cast Steel;Lost Foam Casting;Cast-infiltration Coating;Wear Resistance;Composites
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发布时间：2023-12-18 - 摘要：Mg2Si/Mg-5Zn-2.5Er composites were fabricated by repeated plastic working （RPW） via solid state reaction and hot extrusion. Number of RPW was 100,200,300 and 400,respectively. Effects of RPW times on microstructure and mechanical properties of the composites were investigated by XRD （X-ray diffraction）,SEM （scanning electron microscope） and OM （optical microscope）. The results show that with increasing in RPW times,size of Mg2Si phase is gradually decreased with more uniform distribution. With 200 times RPW,the composites exhibit desirable comprehensive mechanical properties,and average grain size in the composites reaches 1.8 μm,decreased by 81.6% compared with that of samples without RPW,which is attributed to the grain refinement caused by repeated plastic deformation and grain growth caused by dynamic recrystallization during solid state reaction and hot extrusion. In addition,tensile strength reaches 394MPa,increased by 25.4% compared with that of ones without RPW,and elongation makes 5.5%. The strengthening mechanism of the prepared composites is characterized by grain refinement.关键词：Composites;RPW;Mechanical Properties;Microstructure
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发布时间：2023-12-18 -
Effects of Si Content in Matrix on Tensile Strength and Fracture Morphology of SiCp/Al-Si Composites
摘要：Effects of Si content in the matrix on tensile strength of SiC particle reinforced Al matrix composites were examined,and relationship between fracture morphology and tensile strength was described. The results indicate that with increasing in Si content,tensile strength of the composites is decreased in sequence of hypoeutectic,eutectic and hypereutectic Al-Si alloy. Fractural morphology observation reveals that with increasing in Si content,number of dimple is decreased and facet is gradually increased,showing the decrease of plasticity. The facet is composed of SiC particle,Si phase and Al8FeMg3Si6 phase.关键词：Aluminum Matrix Composites;Tensile Strength;Fracture Morphology- 2
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发布时间：2023-12-18 - 摘要：In order to obtain Al based composites with favorable microstructure and high damping behavior,in-situ TiB2/A356 aluminum matrix composites were fabricated by the mixed salts method. Microstructure and composition of the composites were analyzed by SEM （scanning electron microscope）,OM （optical microscope） and XRD （X-ray diffraction）,and damping behavior was examined. The results show that TiB2 particle with approximately 300 nm in average grain size are uniformly distributed into the matrix,exhibiting apparent refinement for primary grain size,which results in the strength,modulus and damping of the composites superior greatly to those of the matrix alloy.关键词：Aluminum Matrix Composites;In-situ;TiB2 Particle;Damping Behavior
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发布时间：2023-12-18 -
- 摘要：Nb-Ti-Si-Cr-Hf-Al-B-Y superalloy was prepared by vacuum consumable arc melting,and its ambient fracture toughness and mechanical properties were measured. The constituent phases,microstructure,composition distribution and fracture morphology at different positions in the alloy ingot were observed by XRD （X-ray diffraction）,SEM （scanning electron microscope） and EDS （energy dispersive spectrum）. The results reveal that microstructure of the alloy is mainly composed of primary （Nb,X）5Si3 （where X represents Ti,Hf and Cr） and Nbss/（Nb,X）5Si3 eutectic colonies （Nbss denotes Nb solid solution）,in which primary silicide is distributed discontinuously in the shape of regular blocks or plates and Nbss/（Nb,X）5Si3 eutectic colonies exhibit typically lamellar or petal-like morphologies. Si content is increased from the edge to the center while the Nb and Ti contents are higher in the edge than in the center of the ingot. Solubility of Cr and Al in Nbss is higher than in （Nb,X）5Si3 while Hf mainly is segregated in （Nb,X）5Si3. Ambient fracture toughness and tensile strength of the arc-melted alloy reach 10.72MPa.m1/2 and 297.12 MPa,respectively. In addition,ambient fracture mechanism is characterized by brittle quasi-cleavage mode in both fracture and tensile morphology.关键词：Nb-Ti-Si Based Alloy;Arc Melting;Eutectic;Fracture Toughness
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发布时间：2023-12-18 - 摘要：After adopting the quartz plate-like filter with 20 mesh to filter the ZL102 alloy from Al-30Si coarse alloy produced by electro-thermal method,the Fe content in the alloy is decreased from 1.14% to 0.43%,and its morphology is converted from bulky and rosette structure into fine bulky structure,so the tensile strength and elongation reach 182 MPa and 4.3%,respectively,increased by 38% and by 290%,respectively,compared with those of the alloy before filter. The results verify that mechanical properties of the alloy are closed to those of the alloy compounded by pure Al,fully meeting the requirement of commercial production.关键词：Al-30Si Coarse Alloy;ZL102 Alloy;Filter;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Rich Al infiltration layer on AZ91 D magnesium alloy surface was prepared synchronously in die casting process by surface infiltration technology. Thickness,microstructure and micro-area composition in the infiltration layer were analyzed. The results show that the rich Al infiltration layer exhibits metallurgical bonding with the matrix. With increasing in thickness of coated Al powder on surface of mould,infiltration layer on the magnesium alloy surface becomes continuous and compact with thickness increase,however,change of chemical composition in micro-area shows slightly. Al content in infiltration layer is decreased gradually from surface to inner layer.关键词：Magnesium Alloy;Aluminum Powder;Surface;Infiltration
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发布时间：2023-12-18 - 摘要：Effects of RE content and heat treatment on microstructure and mechanical properties of Al-Mg-Si plate were investigated. The results reveal that mechanical properties of the plate sheet are improved with 0.2% RE addition in condition of T4 preageing and baking,where yield strength and tensile strength reach up to 281 MPa and 373 MPa,respectively,compared with those of ones without RE addition,increased by approximately 40 MPa and 30 MPa,respectively,showing improvement of strength and plasticity of the alloy with 0.2% RE addition. Although the alloy with 0.2% RE addition exhibits a higher elongation,yield strength and tensile strength is lower about 120 MPa and 40 MPa than those of T6 treated alloy in condition of T4 via baking. Fine and compact precipitates can be observed in the alloy after T4 preageing via baking,which results in the equivalent T6 treated alloy in tensile strength and the increase of 4% in elongation. The results show that the RE elernent play more positive role in improving properties of the alloy after preageing.关键词：Al-Mg-Si Alloy;Sheets;RE;Pre-ageing
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发布时间：2023-12-18 - 摘要：Micro-arc oxidation experiments were carried out for AZ91D magnesium alloy by unipolar,ambipolar pulse and discharge circuit to remove output modes to investigate wave types of load voltage and current under different pulse types for micro-arc oxidation and effects on MAO process and efficiency for AZ91D alloy. The results reveal that capacitive load characteristics can be cancelled by using discharge circuit pulse mode,which makes the MAO process stable and arc point uniform,surface of film smooth and gas hole heterogeneous and compact,effectively improving the film efficiency.关键词：Magnesium Alloy;Micro-arc Oxidation;Pulse Types
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发布时间：2023-12-18 - 摘要：Effects of morphology of eutectic Si phase,size of α-Al dendrite in compound modified Al-Si series alloy on mechanical properties of the alloy were analyzed by fracture-metallographic method. It is found that refinement of α-Al dendrite and desirable morphology and distribution of eutectic Si in compound modification samples can restrain the crack propagation during tensile process and make the formation of small crack unit absorb more energy during crack process,which results in the increase of crack propagation paths in transgranular fracture,exhibiting the improvement of comprehensive mechanical properties of the Al alloy.关键词：Al-Si Series Alloy;Compound Modification;Fracture-metallographic;Eutectic Si Phase;α-Al Dendrite;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Effects of La-Ce mischmetal on primary Si and eutectic Si in hypereutectic Al-24Si alloy were investigated. The stereo-morphologies of primary Si and eutectic Si in un-modified and in La-Ce modified alloys were obtained by different etching and extracting methods. Microstructure and phase constituent of the alloy were observed by SEM （scanning electron microscope） and XRD （X-ray diffraction）. The results reveal that,on the one hand,the La and Ce enrichment in the liquid alloy of Si/Al interface front can inhibit the growth of Si phase,on the other hand,it causes the constitutional supercooling,during the crystallization process of Al-24Si alloy,which makes the Si phase grow in non-faceted mode or so-called rough interface mode,resulting in the morphology change of primary Si phase and eutectic phase. Composition analysis of rare earth compounds in Al-24Si alloy shows that atomic percentage of Si is higher,showing the partly consumption of Si atoms during RE compound generation process,which results in the decrease of Si content in primary Si and eutectic Si phase to effectively restrain the growth of primary Si and eutectic Si phases.关键词：La and Ce Mischmetal;Al-24Si Alloy;Growth of Si Phase
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发布时间：2023-12-18 - 摘要：Effects of Ce additions on electric conductivity,hardness and fatigue behavior of extruded pure copper bars were examined. The results show that grain size in the extruded pure copper bars with Ce addition is distinctly finer than that of ones without Ce. Electric conductivity,hardness and fatigue behavior of the extruded pure copper bars can be greatly improved by adding Ce,where ideal comprehensive properties can be obtained with 0.04% Ce addition.关键词：Pure Copper;Electric Conductivity;Hardness;Fatigue Behavior
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发布时间：2023-12-18 - 摘要：The roles of plating assistant agent KF in Cu/Al liquid-solid compound during hot-dipping process were analyzed,and effects of liquid aluminum temperature,dipping time on thickness of metallurgical bonding layer and its constituent were described. An acceptable hot-dipping parameters were determined. Desirable compound effects can be obtained in the Cu/Al bimetallic composites with dipping surface treated samples in the KF solution for 4 min and then hot-dipping at 720℃ for 25 s,which provides a theoretical basis for further investigating Cu/Al liquid-solid compound technology.关键词：Hot-dipping Aluminization;Plating Assistant Agent KF;Copper Aluminum Composites;Liquid-solid Compound
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发布时间：2023-12-18 - 摘要：A new high aluminum Zn-based alloy was prepared by changing alloy composition. Microstructure,mechanical properties and thermal expansion coefficient of the prepared alloy were investigated in condition of as-cast state,solid solution and ageing treatment. The results reveal that mechanical properties and dimensional stability of the alloy can be greatly improved with RE addition,meanwhile,dimensional stability of the alloy containing RE is greatly superior to that of the ZA27 alloy.关键词：High Aluminum Zn Based Alloy;Solid Solution;Ageing Treatment;Thermal Expansion Coefficient
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发布时间：2023-12-18 -
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