最新刊期
卷 33 ， 期 6 ， 2013
- 摘要：The solidification structure of twin-roller continuous casting pure aluminum was predicted by a 3D cellular automaton （CA）-finite element （FE） model. In the present CA-FE model, Gaussian distribution of nucleation sites was adopted both at the roll surface and in the melt. Then the modified Kurz-Giovanola-Triedi（KGT） model was used to describe the growth kinetics of dendrite tip. Simulated results show that the grain growth in random preferential growth directions can be described by the model reasonably, and the simulated results are coincident with actual phenomena in temperature field, solute field and microstructure evolution. By use of the model, the effects of process and solidification parameters on the solidification structure of grain zone were understood. The results show that the width of columnar grain zone is increased with increasing in roll surface heat transfer coefficient, while it is decreased with the increase of inner max nucleation density, and fine and uniformly distributed grain in the solidification structure can be observed.关键词：Twin-Roller Continuous Rolling-Casting;Solidification Structure;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Surface of TC4 alloy was treated in kerosene-based oil, misted deionized water and near-dry powder-mixed medium conditions with the graphite electrode by electric sparking deposition. The microstructure, phase constituent and micro-hardness of the strengthened layers were investigated by SEM （scanning electron microscope）, EDS （energy dispersed spectrometer） and micro-hardness testing. The results indicate that microstructure of strengthened layer prepared in the three medium exhibits chrysanthemum petal-like. The strengthening layer morphology is similar in misted deionized water and in near-dry powder-mixed medium conditions, which is more compact than that in kerosene-based oil condition. Phase constituent of strengthened layer on the TC4 alloy prepared in the three medium was analyzed. The results show that the strengthened layer is composed of α-Ti and TiC in kerosene-based oil and misted deionized water medium, while it contains TiB in near-dry powder-mixed medium condition besides α-Ti and TiC phase. In addition, compared with that of the TC4 alloy matrix, the micro-hardness of strengthened layer prepared in the three medium is improved significantly, in which the maximum performance is achieved from original average micro-hardness 300 HV to 1 200 HV in near-dry powder-mixed medium.关键词：TC4 Alloy;Strengthened Surface;Microstructure;Micro-Hardness
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发布时间：2023-12-18 - 摘要：<正>根据2012年5月在北京举行的中国铸造协会六届理事会第三次会议决定,自2014年开始,每两年由中国铸造协会筹备与举办一次"中国铸造节"活动。"中国铸造节"旨在整合与包装中国铸造协会长期以来开展的各项行业活动,深度创新铸造文化品牌,高度满足广大铸造工作者对行业活动品质与品味不断提升的要求。通过有效开展"中国
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发布时间：2023-12-18 - 摘要：<正>据"临淄齐故城冶铸遗存考古发掘与研究"项目负责人白云翔介绍,经过近两年的发掘和研究,考古人员在山东省淄博市临淄齐国故城内的今阚家寨村南一带发掘的遗址,证明是一处距今有2000多年历史的西汉时期的铜镜铸造作坊。这是世界上首次发现的古代铜镜铸造作坊遗址。白云翔告诉记者,铸坑、水井、沙坑等一系列遗迹的揭露,以及100余件镜范残块、鼓风管等铸铜遗物的出
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发布时间：2023-12-18 - 摘要：<正>中国铸件产量增速放缓的情况在2013年已经初现端倪,中国的铸件产量受各种因素,特别是铸件供需关系和产能饱和的影响,产量增速将大幅放缓。2013年预计在大的经济环境和下游需求没有大变化的情况下,铸件产量增幅将更加放缓。我国是铸件生产大国,铸件产量居世界第一。据铸造协会发布的信息,2012年中国各类铸件总产量为4250万
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发布时间：2023-12-18 - 摘要：<正>目前,我国铸造行业劳动力市场与其它行业一样面临着两难窘境:一方面,很多铸造企业招工难,招高级技能工人更难;另一方面,随着人口红利拐点的出现,职业技术院校招生又极为困难。为此,国务院提出了实行"学业文凭"和"职业资格"并重的制度,人力资源和社会保障部积极推进,准备于今年6月提交方案,计划用一年时间过渡,至明年6月之后正式开始实施劳动者持证上岗制度。
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发布时间：2023-12-18 - 摘要：The HT250/ZL101A bimetal composite cylinders were manufactured by the combination of hot-dipping and casting technology. The diffusion interfaces in different conditions were investigated by means of field emission scanning electron microscope（FESEM）. The results indicate that the Al melt conditions play a decisive role in the formation and growth of diffusion layer. It is concluded that cast iron dip in ZL101A melt at 700 ℃ for 10 min. In addition, with increasing in dipping time, distinct changes of the thickness and morphology of diffusion layers can be ignored and diffusion layer thickness keeps approximately 30 μm,which may be related to the formation of τ5-Al8Fe2Si phase at the interface acted as a barrier to further diffusion of Al atoms.关键词：Bimetal Composite Cylinders;Intermetallic Phases;Diffusion Interfaces;Composite Casting
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发布时间：2023-12-18 - 摘要：Influences of MgO ceramic foam filter with different apertures on structures and properties of magnesium were observed by SEM （scanning electron microscope）,XRD （X-ray diffraction） and metallurgical microscope. The results show that residual inclusion is decreased greatly and the density of crude magnesium filtered can gradually be tended to theory density with decreasing in filter apertures, while grain sizes of the magnesium filtered are increased, meanwhile, absence of eutectic phase can be observed.关键词：Ceramic Foam Filter;Crude Magnesium;Filter
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发布时间：2023-12-18 - 摘要：NiCrBSi coating was prepared on the surface of 45 steel with 5 kW TJ-HL-T5000 CO2 laser by powder metallurgy. The microstructure and properties of the cladding layer were characterized by SEM （scanning electron microscope）、EDX（energy dispersive X-ray）、XRD （X-ray diffraction）. The micro-hardness and wear resistance of the laser cladding layer were examined by microhardness meter and M-200 ring-block wear tester. The results show that laser cladding layer with the good metallurgical bonding between the coating and substrate and dense, uniform, continuous and free of pores and cracks can be observed based on the optimized processing parameters. The microstructure of the cladding coating is mainly composed of dendrite γ-Ni、eutectic Ni3B、bulky particles CrB and dendrite Cr23C6 particles. The microhardness of the cladding coating （HV0.2）500～650 is approximately 2 times than that of the substrate（HV0.2）250, which is attributed to particle strengthening and grain-refining strengthening effects, greatly improving wear resistance of 45 steel.关键词：Laser Cladding;NiCrBSi Coating;Microstructure;Wear Resistance
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发布时间：2023-12-18 - 摘要：Influences of processing parameters on microstructure of extruded ZK60 magnesium alloy tube were investigated. The results show that the suitable extruding parameters for ZK60 magnesium alloy tube are presented as follows: semi-angle of cone-shaped die of 70°, billet temperature of 300～360 ℃, and mold pre-heating temperature of 270～330 ℃, extrusion speed of 1.5 mm/s and animal fat lubricant. The grain size can be fined in the extruded tube with increasing in extrusion speed and decreasing in extrusion temperature, however, the extruded force is increased. At a given forming temperature, the extruded force in isothermal forming is decreased by 20% than that of non-isothermal forming. With the extrusion temperature of 300～360 ℃, the dynamic re-crystallization occurs completely with fine and uniformly distributed microstructure. The grain size is fined by 40% of the original grain.关键词：ZK60 Magnesium Alloy;Tube;Extrusion;Microstructure Properties
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发布时间：2023-12-18 - 摘要：According to the effects of solidification shrinkability of alloy on quality of die casting parts, parts and mould were designed by the Pro/E software. The temperature field of die casting die was analyzed by the ANSYS software. The simulated results show that the ANSYS software can optimize the processing parameters of complicated die casting parts, and the optimized mould preheating temperature can be presented to make temperature field uniformly distribute in the mould to improve effectively the accuracy of the parts and eliminate the possible reject. In addition, some non-important structure can be ignored in process of designing part configuration and mould structure/die casting process was analyzed by adopting hexahedral element. The choice of unit numbers and time step should consider the comprehensive effects of operation accuracy and simulation efficiency.关键词：Die Casting Parts;Finite Element Method;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Process structure was designed for magnesium die casting based on analysis of the process of frame type magnesium alloy castings. The filling and solidification of magnesium alloy in die casting were simulated by the software. Shrinkage porosity （holes） probability in the die casting was forecasted. The results show that the optimized condition is presented as follows: injection speed of 3.3 m/s, pouring temperature of 670 ℃, mold initial temperature of 190 ℃.关键词：Frame Type;Magnesium Alloy;Die Casting;Numerical Simulation;Defect Rate
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发布时间：2023-12-18 - 摘要：<正>铸件清理设备及技术已在汽车、机床、农机等行业得到广泛应用,清理设备的品种、规格也在逐渐增多,铸造企业在选择和使用铸件清理设备时应注意哪些问题,在使用过程中遇到产品问题又应如何解决,如何延长设备使用寿命,降低生产成本,实
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发布时间：2023-12-18 - 摘要：<正>随着现代化生产对铸件质量要求的提高,现代铸件对制芯装备的性能和使用提出了更高要求。铸造企业在选择和使用制芯设备时应注意哪些问题,如何解决,同时又如何使制芯设备效率最大化,并实现节能减排,这些都是亟待解决的重要问题。拟于2013年10月在苏州召开"制芯设备
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发布时间：2023-12-18 - 摘要：<正>随着经济社会的发展与市场需求增长,中国逐步成为全球金属镁生产和出口第一大国。20日,第七十届国际镁业大会在西安举行,来自五大洲30余个国家和地区涉镁行业的700多名代表共商世界镁业发展之策。资料显示,国际镁业协会创建于1943年是全球性的镁业组
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发布时间：2023-12-18 - 摘要：The influences of processing parameters, such as reheating time, mould temperature, on microstructure and tensile properties of thixoformed AZ63H magnesium alloy were investigated. The results indicate that the tensile strength and elongation are increased firstly and then decreased with increasing in the reheating time and the mould temperature. Compared with the permanent mould casting, the thixoforming significantly decrease gas pores and change the solute distribution in the AZ63H melt, thus affect the Al solubility from β -Mg17Al12 phase in primary α-Mg phase, which are responsible for the improvement of tensile strength and elongation as a result of the decease of porosities, inclusion and gas holes as well as the solid solution strengthening. The maximum tensile strength and elongation reach up to 273 MPa and 10.3%, respectively, at 300 ℃.关键词：AZ63H Magnesium Alloy;Thixoforming;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Semi-solid melt of A356 aluminum alloy was prepared by a inclined slope method , and rheological filling behavior of the semi-solid melt prepared was tested by Archimedean spiral experiments mold under pressure. The results show that with the increase of filling pressure and pouring temperature, the rheological filling capacity of the semi-solid melt prepared in condition of pressure is increased, and pouring temperature is dominant in affecting filling behavior of the semi-solid melt prepared. With filling speed in range of 142～427 mm/s, the rheological filling capacity is increased with increasing in filling speed. Influence of filling pressure on the rheological filling capacity can be described as linear increment function.关键词：Aluminum Alloy;Semi-Solid;Pressure Rheology;Metal Mold;Filling Capacity
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发布时间：2023-12-18 - 摘要：The zinc alloy worm gear was produced by squeezing casting. The microstructure and mechanical properties of the zinc alloy worm gear were investigated by metallurgical microscope and electron universal test machine. The optimized squeezing parameters were presented as follows: holding temperature of 570～630 ℃, both mould and pouring system heated to 150～250 ℃, punching velocity of 5～10 mm/s and pressure of 30100 MPa for 40～120 s. The results show that the microstructure of the worm gear is obviously refined, and the mechanical properties are increased greatly, meanwhile the quality of zinc alloy worm gear is controlled effectively. Compared with those of permanent mold casting worm gear, tensile strength and elongation of the squeezing casting worm gear are improved by 100MPa and by 139%, respectively.关键词：Squeezing Casting;Zinc Alloy Worm Gear;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The microstructure and properties of squeezing casting ZL111 aluminum matrix composites with 20% silicon carbide particles by horizontal squeezing casting machine were investigated. The results show that the composites can be prepared by horizontal squeezing casting with specific pressure of 135 MPa and extrusion punches speed of 0.4 m/s as well as pouring temperature of 710 ℃. The silicon carbide particles are uniformly distributed in the microstructure, and absence of aggregation of the SiCp can be observed, so the SiCp content is uniform in the composites samples. In addition, the SiC particles are distributed only in the eutectic structure in the composites samples. Wear resistance of the composite samples is significantly improved, leading to a sharp wear of cutting tool. Meanwhile, the Brinell hardness is in range of 76.7HB～94.4HB, which is basically near to that of ZL111 alloy.关键词：Squeezing Casting;Silicon Carbide Particles;Aluminum Matrix Composites;Hardness
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发布时间：2023-12-18 - 摘要：Effects of twin-stage nitriding and conventional nitriding process on service life of die were analyzed comparatively by hardness testing, microstructure and fracture morphology. The mechanism of twin-stage nitriding improving service life of die was described. Die hardness in twin-stage nitriding is 100 higher than that in conventional nitriding, and nitriding layer is thicker than 50 μm. Twin-stage white layer thickness is 3.9 μm, while conventional hite layer thickness is 1.4 μm. Segregation phase and carbon compound result in the occurrence of internal stress , which is responsible for the crack and die failure. Service life of twin-stage nitriding die is increased by 2 t compared with that of conventional nitriding die.关键词：H13 Steel;Twin-Stage Nitriding;Extrusion Die;Service Life
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发布时间：2023-12-18 - 摘要：<正>铸件气孔分为卷入性气孔、析出性气孔和侵入性气孔。析出性气孔是由金属液析出的气体形成;卷入性气孔是铸型和浇注系统在浇注前被大气占领的,浇注时不平稳的金属流很可能将型腔中气体卷入而形成气孔;侵入性气孔是浇注时,铸型由于受液态金属热作用而产生
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发布时间：2023-12-18 - 摘要：The initial process of investment casting heat resistant steel exhaust manifold was analyzed. The reasons of poor quality and low product yield were discussed. Optimized scheme was presented. The riser volume is enlarged from 78 cm3 to 126cm3 to increase the feeding distance, and the spure volume is reduced from 958 cm3 to 370 cm3 with the sprue shifting to the top of the exhausting pipe. The experimental trial was conducted with the help of the optimized process parameters, and soundness castings were produced successfully. Meanwhile, the product yield is increased from 38.8% to 49.1%. Finally, with the help of ProCast software, the casting defects in original design were visualized and confirmed.关键词：Heat-Resistant Steel;Exhausting Manifold;ProCAST Software;Casting Yield
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发布时间：2023-12-18 - 摘要：The characteristics of filling and compact surface of dry sand moulding for EPC was simulated by three dimensional discrete element method, in which a special EPS pattern for testing was designed, to understand the motion characteristics of sand colony under different vibration dimension and directions. The flow morphology of sand colony in the EPS pattern was presented during the vibration process,and the effects of vibration dimension and direction on the motion of sand colony were described. The results show that the optimization combination between the filling motion of sand colony in-tube and vibration form exhibits consistent with the direction, at the same time, gravity and tube direction have a great influence on sand colony motion, which leads to particularity of Z-tube and Z-vibration.关键词：Dry Sand Moulding;Sand Colony;Motion Characteristics;DEM;Numerical Simulation
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发布时间：2023-12-18 - 摘要：An automatic spray dedusting system for reducing the air dust in V-process casting workshops was developed. The system consists of automatic control system module and the spray operation module. Based on dust sensor, the whole system could realize the automatic spray when the dust concentration comes to its limit. The results show that the spray system can reduce the concentration of air dust in V-process casting workshops significantly by measuring before and after the concentration of air dust.关键词：V-process Casting;Spray Dedusting System;Automatic;Environmental Protection
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发布时间：2023-12-18 - 摘要：Out-of-round is one of the failure types of grinding ball in the metal mold casting besides of abrasion and fragmentation failure, which has two types of the shape of steamed bread and pear. Microstructure defects, appearance defects during casting and grinding during working process are responsible for the failure. Through refining molten iron, changing geometric shape of grinding ball and standard specification of polishing, the out-of-round defects of the grinding ball can be eliminated.关键词：Grinding Ball;Out-of-round;Failure;Solving Measure
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发布时间：2023-12-18 - 摘要：Effect of heating treatment on microstructure and mechanical properties of a novel high aluminum bronze which was prepared by alloying method were investigated by XRD （X-ray diffraction）, SEM （scanning electron microscope） and HRS-150 Rockwell hardness tester,and the optimized parameters for solution-aging treatment were presented. The results show that the as-cast microstructure of alloy is composed mainly of α,β ’,γ2 and k phases. The hardness, tensile strength and elongation of the alloy prepared reach 42.6HRC, 890 MPa and 9.84%, respectively, after 950 ℃×2 h solution（quenching in oil）+550℃×4h aging（cooling in air）, exhibiting acceptable comprehensive mechanical properties.关键词：Novel High Aluminum Bronze;Solution and Aging;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Influences of the step solution heat treatment on microstructure and wear resistance of Zn-40Al-4Cu alloy were investigated. The results show that step solution treatment can improve the microstructure and homogeneous composition of Zn-40Al-4Cu alloy, where α dendrite is converted into block one, and α+η eutectoid structure is transformed from lamellar to well mixed particles. The size of ε phase is reduced with more round shape. In addition, step heat treatment can increase greatly the hardness of Zn-40Al-4Cu alloy and reduce the coefficient of friction and wear loss.关键词：Step Solution;Heat Treatment;Zn-40Al-4Cu Alloy;Wear Resistance
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发布时间：2023-12-18 - 摘要：The Al-Ce-Sb-Ti master alloy was prepared by vacuum melting to refine the grains of Mg-Zn-Al alloys. The results show that Mg-10Zn-5Al（ZA105） magnesium alloy with appropriate addition of Al-Ce-Sb-Ti master alloy contains lots of hard particles which gather in the front of solid-liquid interface, preventing the growth of the second phase and improving the microstructure of ZA105 magnesium alloy. At the same time, the hard particles are taken as nucleation sites of ZA105 magnesium alloy to refine its grain size. With proper addition of master alloy, the grain size grade of ZA105 magnesium alloy is improved from 4 level to 6 level.关键词：Al-Ce-Sb-Ti Master Alloy;ZA105 Magnesium Alloy;Micro-Structure;Grain Refinement
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发布时间：2023-12-18 - 摘要：A new kind of compound aluminum cooling plate for radiant heat of electrical and electronic equipment has been developed by a new composite casting technology, which contains a long and curved coolant channel formed by an aluminum tube. The new casting process can overcome the shortcomings of machining-brazing process and inlaying cooper tube casting process. The high quality aluminum cooling plate with complete filling have been produced by metal gravity casting with pouring temperature of 710～740 ℃, mold temperature of 250～300 ℃ and cooling intensity of 800～1 000 L/min.关键词：Aluminum Cooling Plate;Aluminum Tube;Casting Process
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发布时间：2023-12-18 - 摘要：Effects of mechanical vibration parameters, such as amplitude, frequency, pouring temperature and preheating temperature of mold, on solidification structure of ignition-proof magnesium alloy AZ91D-3Ca were investigated. The results show that solidification structures of ignition-proof magnesium alloy AZ91D-3Ca can be refined by controlling mechanical vibration parameters and solidification conditions. Primary grain in the alloy is refined gradually with the increase of amplitude within 0～1.7 mm. When frequency is 1Hz, refinement effect of primary grain appears. With frequency in range of 50～100 Hz, change of microstructure refinement can be ignored. With the increase of pouring temperature （610～700 ℃）or preheating temperature of the mold （room temperature to 600 ℃）,primary grain of the alloy is coarsened gradually by mechanical vibration.关键词：Ignition-Proof Magnesium Alloy;Mechanical Vibration;Solidification Structures
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发布时间：2023-12-18 - 摘要：A new-type nano-sized TiN/Ti composite grain refiner was prepared by high energy ball milling. Influences of the refiner on the as-cast microstructures and properties of Al-4Cu after solid solution and aging were investigated, and the grain refining mechanism was also discussed. The results show that TiN/Ti composite refiner exhibits the excellent grain refining effects on as-cast microstructure of Al-4Cu alloy. TiN/Ti composite refiner can refine significantly the α-phase, and with 0.2% addition, average grain size of α-phase in Al-4Cu sample is decreases from 161 μm to 131 μm, showing better grain refining effect than pure Ti refiner. The micro-hardness of the aged sample with 0.2% TiN/Ti refiner reaches hardness peak of 125 HV, increased by 19% than that of the sample without any refiners. Comparing with those of the sample without adding grain refiners, the tensile strength and yield strength of the sample with 0.2% TiN/Ti refiner are increased by 103.1% and by 155.42%, respectively. In addition, the fracture of the sample without any refiners is characterized by mixed-rupture of quasi-cleavage and dimples, while the fractured faces of the sample with 0.2% TiN/Ti refiner are characterized by ductile fracture with dimples.关键词：Al-4Cu Alloy;Nano TiN;Grain Refining;Age Hardening;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Defect-free solidification of the ZL205A mount casting was achieved by temperature field simulation, gating system design and chilling material selection. The quenching size deformation was controlled by manufacturing heat treatment equipment combining with static pressure size correction process, reducing geatly the size deformation after heat treatment. Mechanical properties and size test results of single sample show that the whole properties meet or exceed the beacon standards, reaching the design requirements.关键词：ZL205A;Mechanical Properties;Size Control
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发布时间：2023-12-18 - 摘要：Effects of Mg addition and infiltrating time on microstructure and mechanical properties of carbon fibre reinforced aluminum matrix composites were investigated. The results show that the tensile strength of the composites is increased with increasing in Mg addition, however, with Mg content more than 8.5%, the tensile strength of the composites prepared is decreased. The tensile strength of the composites is decreased with the increase of infiltration time, and the declining tendency exhibits sharp in the first 8 min and then slow.关键词：Cf/Al Composite;Aluminum Magnesium Alloy;Carbon Fibre;Interface;Infiltration Time
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发布时间：2023-12-18 - 摘要：Micrometer-sized Al powder and nano-sized Al2O3 particles were compressed into blocks, and then the blocks were added to the Al melt to prepare successfully Nano-Al2O3/Al composites with 1.0 % Al2O3 in volumetric fraction by dip block-stir casting. The microstructure of aluminum matrix composites was observed by the scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The results show that nano-Al2O3 particles are distributed uniformly in the Al matrix by dip block-stirring casting, and the interface of Al matrix and nano-Al2O3 particles in aluminum matrix composites exhibit acceptable bonding. Meanwhile, Al matrix and nano-Al2O3 particles have the Al2O3 （1014）//Al （200） crystal orientation, forming a coherent relationship.关键词：Aluminum Matrix Composites;Nano;Al2O3 Particle;Interface
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发布时间：2023-12-18 - 摘要：<正>2013年1月27～29日,印度国际铸造展览会（IFEX2013）在印度北部工业城市——班加罗尔隆重举办。展览总面积8000平方米,有150余家企业参展。中国铸造协会范琦副秘书长带领中国参展团一行16人参加了展览会。IFEX是每年一度的印度铸造专业展览会,由印度铸造协会和印度科隆公司联合主办,在印度的5个城市轮流举办。中国铸造协会自2008年起每年都组团参展、参观。几年来,通过展览
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发布时间：2023-12-18 - 摘要：Effects of Ce on microstructure and properties of as-cast,cold working,anti-electrochemical corrosion, anti-tarnishing of sulfuration and anti-oxidation of 925Ag silvers were investigated by means of optical microscopy,hardness testing,potentiadynarnic polarization,SEM （scanning electron microscopy） and color analysis. The results show that with 0.05% Ce addition, compact and fine grain structure in 925Ag alloys can be observed with the proper hardness and the minimum shrinkage porosity （holes）,and the desirable anti-electrochemical corrosion,anti-tarnishing and anti-oxidation performance can be obtained in the alloy. When adding more than 0.075% Ce,the cold working performance and properties of anti-electrochemical corrosion as well as anti-tarnishing are deteriorated as a result of the more occurrence of second phase,grain boundary segregation and the increase of shrinkage porosities.关键词：Ce;925Ag Alloys;Structure;Properties;Corrosion Resistance
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发布时间：2023-12-18
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