最新刊期
卷 ， 期 3 ， 2005
- 摘要：Three kinds of normal solidification Ni-Al series binary peritectic alloys were prepared by electric arc smelting with Ar protection.The microstructure and phase constituent of these alloys were investigated by DSC,SEM and linear scanning.The resutls show that the α-Al phase segregating in the boundary of metastable phase appears in the solidification phase due to restricted peritectic reaction resulting in the obvious hysteresis of peritectic solidification during normal Ni-Al alloy solidification process.关键词：Ni-Al Alloy;Peritectic Reaction;DSC;SEM;Linear Scanning
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- 159
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发布时间：2023-12-18 - 摘要：Manganese was added into aluminum melt to improve the shape of iron-enrichment phase impurities.The effects of Mn addition on the shape of the Fe-enrichment phase were researched.It was confirmed that the iron-enrichment phase transformed into regular block-like shape with the ratio of Mn/Fe =1.4～1.5（molar ratio）.The experimental results show that the shape of the Fe-enrichment phase has an obvious effect on the purification of aluminum melt with different Mn addition in static electromagnetic field,and the purification is improved with regular shape of Fe-enrichment phase.关键词：Iron-enrichment Phase;Deformation;Purification;Regularization
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- 173
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发布时间：2023-12-18 - 摘要：The optimized crystallizer should ensure that the desirable magnetic flux density can be realized in Al melt with lower current under the same power-frequent.The industrial practical crystallizer for Al alloy in low-frequent electromagnetic casting was designed based on the above mentioned idea.A 3D FEM numerical simulation of electromagnetic field in the crystallizer with different outer sleeves materials for Al melt in low-frequent electromagnetic casting were conducted.The results showed that the magnetic flux density in the Al melt can be enhanced with outer sleeves of soft magnetic materials in crystallizer.关键词：Numerical Simulation;Crystallizer;Electromagnetic Casting;Al Alloy
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- 213
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发布时间：2023-12-18 - 摘要：A discriminable system with image collection and image pretreatment module for metallographic structure was developed based on the image treatment technology,which can realize the quantitative discriminability of the metallographic structure.The strucure of nodular cast iron was analyzed by the system.The system has a practical value for improving the measuring accuracy of the metallographic structure.关键词：Metallographic Structure;Quantitative Analysis;Image Module;Quantitative Discriminability
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- 778
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发布时间：2023-12-18 - 摘要：The rigidity of moving container that is an important component for Mg die-casting machine has a remarkable effect on the precision of the product.The mechanical properties of utmost load of moving container for 30 000 kN die-casting machine from a plant in the China were analyzed by FEM.The simulated results of displacement and stress field of different designed plans were compared.Some pieces suggestion to corresponding production were given based on the analysis of designed plans according to the simulated results.The results indicated that the lightening hole has some effects on the rigidity of the moving container.The existent design has some limitation,in which the hinge bracket has a smaller loading area.关键词：Mg Alloy;Die-casting Machine;Moving Container;Utmost Load
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- 127
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发布时间：2023-12-18 - 摘要：The factors influencing rising delaying time of liquid surface in low pressure casting were investigated by orthogonal testing for hydraulic simulation.It was found that the pressure-applying speed and anti-pressure in mold cavity have significant effects on the delaying time.The rising delaying time of liquid surface increases with the increase of pressure-applying speed and anti-pressure in mold cavity,meanwhile the air-source pressure and the shape of gap in gap gating system slightly affect the delaying time.The delaying time is low at low pressure-applying speed and is lower at high pressure-applying speed in the condition of accelerating and then slowing the speed.关键词：Low Pressure Casting;Delaying Time;Pressure-applying Speed;Anti-pressure
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- 144
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发布时间：2023-12-18 - 摘要：It is needed to improve the quality of scrap aluminum alloy by stirring because of the easy oxidation during remelting process influencing the quality and resulting in uneven density distribution.It is an ideal method to stirring by electromagnetic stirring.The optimized parameters,including 90° phase angle between two sets coils,frequency of 15～20 Hz,for electromagnetic stirrer can be obtained by the simulation of magnetic field and flow field in the stirrer,which provides a referrence for practical production.关键词：Aluminum Alloy;Electromagnetic Stirring;Simulation
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- 160
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发布时间：2023-12-18 - 摘要：The tranditional hypothesis on modification of eutectic silicon in Al-Si alloys is that the impurity induces twin-crystal proposed by Shu and Hellawell.Sr modification has features of strong modification ability and long effective modification period.Sr incubative period is mainly relevant to the P concentration in the melt.With Sr modification,the cooling rate of the melt should be higher than a critical value due to decreasing in the twin-crystal density with the decrease of the growth rate of the eutectic silicon.Sr modification can result in the increase of the porosity in the Al-Si castings.Sb,P,Bi,Ca and MM（mistchmetal） have the detriment to the Sr modification.关键词：Sr;Modification;Cast Al-Si Alloy
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- 716
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发布时间：2023-12-18 - 摘要：The key design points of die for direct squeezing casting and the die with two-parting surface were introduced.Selection principle on the squeezing casting techniques was discussed.The practice showed that the dominant factors to produce qualified parts in squeezing casting include stably and reliable equipment performance,right techniques and proper die structure.Moreover,the processing parameters should be compatible and exchangable.关键词：Squeezing Casting;Die;Processing Parameters
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- 562
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发布时间：2023-12-18 - 摘要：Thin-walled cover parts with curving surface of ZL201 alloy instead of LY12 alloy were manufactured by squeezing casting based on the factory’s requirements in accordance with the structure characteristics and manufacturing difficulties of the parts.Two sets of moulds for cover parts in squeezing casting were designed and manufactured.The characteristics of the moulds were compared and the squeezing casting technologies were discussed,which provided a basis for the production of qualified cover parts.关键词：ZL201 Alloy;Squeezing Casting;Mould Design
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- 122
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发布时间：2023-12-18 - 摘要：The air-conditioner swaying tray of automobile made of LD11 was manufactured by squeezing casting to overcome the demerits in pressure casting and traditional hot-die forging.The mechanical properties of the swaying tray can reach up to σ b≥280 MPa,δ≥10% and HB of 100～120.The defection in squeezing casting was prevented by determining the processing parameters,including pouring temperature,pressure,preheating and lubricant agent,which provides a referrence for improving the properties and product yield of the swaying tray.关键词：Air-conditioner Swaying Tray;Squeezing Casting;Die;Processing Parameters
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- 174
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发布时间：2023-12-18 - 摘要：A new die releasing agent spraying technology,pulse spraying,was put forward.The preliminary analysis by FEM（finite element method） and some production cycles evaluating results show that the temperature gradient and thermal stress can be greatly decreased by the pulse spraying comparing with traditional continuously spraying,which is beneficial to reducing the thermal stress and improving the sevice life of the mould.Meanwhile,the using volumes of the die releasing agent can be decreased and the quality of the casting surface can be improved.关键词：Die-Casting;Die Releasing Agent;Pulse Spraying
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- 252
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发布时间：2023-12-18 -
- 摘要：With the help of an electromagnetic stirring device,alloy melt quenching and EBSD analysis technology,the microstructure of semi-solid AZ91D magnesium alloy stirred by rotative electromagnetic field with various stirring powers was observed.The results showed that primary α-Mg phase in solidification structure of electromagnetic field stirred AZ91D Mg alloy can be obviously refined to fine rosette-like or spheroidal grains,which are proved to be different grains in three-dimension by EBSD analysis.It was found that the higher the stirring power the finer the primary α-Mg phase,and the less the number of the rosette-like grains,and the more the spheroidal grains.The theoretical analysis indicated that the vigorous flow motion of AZ91D Mg alloy melt ensure more uniformly temperature and solute field as well as larger temperature fluctuation resulting in the formation of the microstructure of semi-solid Mg alloy.关键词：AZ91D Mg Alloy;Electromagnetic Stirring;Microstructure;Semi-solid
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- 504
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发布时间：2023-12-18 - 摘要：The effects of deformation temperature and the strain rates on deformation behavior and microstructure of the semi-solid LY11 alloy were investigated in the condition of isothermal compression.The results indicated that deformation temperature and strain rate have significant effects on peak value of stress of the alloy while slightly affect steady stress with deformation in liquid-solid temperature zone.The solid grain size keeping initial near-spheroid increases with the increase of deformation temperature and the decrease of strain rate.The dominant deformation mechanism varies with varying the processing parameters during compression.关键词：LY11 Alloy;Semi-solid;Deformation Behavior;Microstructure
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- 88
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发布时间：2023-12-18 - 摘要：The sub-micon mixture of AlN and compound salt was manufactured by high-energy ball-milling,and the 2618 alloy composites reinforced with 1% sub-micon AlN particulate （0.1～0.7 μm） were fabricated by a stirring casting method.The results showed that the sub-micon AlN particulate can be uniformly distributed into the alloy matrix.Moreover,the needle-like Al 9FeNi phase transform into fine particulate which is mainly distributed in the grain boundary due to the intensive stirring.关键词：Alloy;Sub-micon AlN Particulate;Composites
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- 74
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发布时间：2023-12-18 - 摘要：Hybrid reinforced AZ91 Mg alloy composites with Al 2O 3 short fibers and graphite particles containing different content and granularity were successfully prepared in squeezing casting.The processes,microstructure and properties of the composites were investigated.It was found that enhancement phase is not only uniformly distributed in the composites but also closely bonded with the matrix,in which the obvious casting defects can not be found.The hardness of the composites was decreases with the increase of the graphite content and with the refinement of the graphite particle size.关键词：Composite;Preparation;Microstructure;Hardness
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- 185
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发布时间：2023-12-18 - 摘要：The oversea controlling techniques of advanced wax-press to processing parameters,including wax temperature,pressing mold temperature,injection temperature and flow velocity of the wax,were introduced.Temperature-sensor was directly inserted into wax to accurately control the temperature of the wax.Thermo-couple was set near cavity surface of pressing mold through separating pressing mold from pressing plate,which was an optimum method to control cavity temperature of the pressing mold.Injection pressure,wax flow velocity and filling pressure as well as impaction pressure should be controlled respectively.The computer program control and real-time control were introduced.关键词：Wax-press;Pattern-making;Wax;Computer Control
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- 138
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发布时间：2023-12-18 - 摘要：Shell-making technology in sol silicate was introduced into China’s market in the 1990 s.A new trade with over 400 enterprises and about 100 000 t product volume per year as well as 5 billions product value appears in the China through the development for over decade.The castings in investment casting in the China have the advantages of cost-efficiency and stridely advance in the master of technology and management,so the trade has a wide perspective in the China.关键词：Investment Casting;Sol Silicate;Export
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发布时间：2023-12-18 - 摘要：There exists a large amount of impurities and detrimental element in furnace wall and inside up-drawing furnace after long time.The various impurities in fumace as well as suspensive inclusion and oxidization inclusion in liquid copper can be eliminated by cleaning adhersion imclusion on the furnace wall in the condition of stoping up-drawing through adopting semi-furnace-cleaned method and making micro-oxidizing and chemical slag-making for liquid copper,so the quality of the copper pipe-billet produced by up-drawing method was effectively improved and the micro-crack in the pipe was greatly decreased.The working performance of the copper pipe was greatly improved also.关键词：Smelting Copper Furnace;Inclusion;Compound Slag-cleaning Agent;Copper Pipe Billet
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- 188
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发布时间：2023-12-18 - 摘要：Compared with conventional sol silicate,the rapidly dried sol silicate possesses the advantages of short shell-making period and high ambient strength as well as low residual strength.Large scale production from investment plants showed that shell mold is easily sand-cleaned and the casting demension meets the requirement of allowance,and the cost is slightly reduced using SKP-27 sol silicate instead of conventional sol silicate.Moreover,the dried time can be shortened up over 50% with proper wind speed and humidity in the dry workshop.关键词：Investment Casting;Sol Silicate;Dry;Wind Speed
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- 244
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发布时间：2023-12-18 - 摘要：To prevent gas-hole,inclusion and cold shut in the castings in lost foam casting,air-runner was adopted and the cover-agent was filled into the runner to make the runner not only have the feeding effects but also improve the holding temperature,exhaust and collection slag,so the product yield is improved.Cover agent,basic materials for sand-core and technology were given.关键词：LFC;Runner Exhaust;Holding Temperature andFeeding
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- 223
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发布时间：2023-12-18 -
- 摘要：The effects of bead diameter,pre-expansion time,aging time of pre-expansion bead,molding steam pressure,storage temperature and time of the pattern on the shrinkage behavior of EPMMA pattern were investigated systematically.It was found that the shrinkage rate of EPMMA pattern is about 0.1% when the pattern is released from the mold,then the shrinkage rate increased gradually with the increase of storage time,and the shrinkage rate stably keeps 0.5%～ 0.6% with about thirty days at ambient temperature or fifteen days at 50 ℃.It was also found that the molding steam forming has the most remarkable effects on the shrinkage rate of the rate,aging time of pre-expansion bead,bead diameter,pre-expansion time in sequence.关键词：EPC;EPMMA;Shrinkage Behavior
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发布时间：2023-12-18 - 摘要：The surface morphology and chemical composition of the formed oxide films on pure magnesium and AZ91D alloy in aqueous electrolytes containing sodium hexafluorinealuminate （Na 3AlF 6）,potassium hydroxide （KOH）,sodium hexametahposphate （NaPO 3） 6,and triethanolamine with bipolar microarc oxidation were investigated by XRD,SEM,EDX.The input of the negative pulse has great effects on the amount and appearance of the microdischarge.Three types of micro-holes,size range in 0.5～1 μm,1～2 μm and 4～7 μm respectively,can be observed on the surface of the oxidized layer,meanwhile micro-cracks appear around a larger micro-hole.There exists a remarkable fluoride-enriched zone with about 4～6 μm for the pure magnesium and 3～5 μm for AZ91D alloy at the coating/substrate interface.关键词：Magnesium;AZ91D Alloy;Electrolytes;Microarc Oxidation
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- 364
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发布时间：2023-12-18 - 摘要：The reasons resulting in the shrinkage porosity,gas-hole and impacted sand in bronze castings were analyzed.These defects were eliminated and the sound castings with steady quality were obtained by adopting cooling-hardness resin sand and setting chilled iron as well as controlling the production process.关键词：Bronze;Impeller;Defects;Improvement
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发布时间：2023-12-18
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