最新刊期
卷 34 ， 期 8 ， 2014
- 摘要：The evolution behavior of cluster and subsequent precipitation in Al-Si-Cu-Mg alloys during aging procss were analyzed by means of three dimensional atom probe（3DAP）and first-principles calculations.3DAP experiment shows that dot-like Si-Si clusters,Si-Mg clusters and Si-Mg-Cu clusters appear in Al-1.0Si-1.5Cu-0.5Mg alloy with aging at 175℃for 0.25 h.First-principles calculation shows that the strong interaction exists between the solute atoms in structures mentioned.It consistents with the3 DAP experimental results.Meanwhile,the diffusion of Si atoms with a large number leads to the generation of Si-Cu clusters.As Si,Mg,Cu atoms continued to precipitation with aging for 0.25h2h,dot-like Si-Si clusters,Si-Cu clusters,Si-Mg clusters are grown into needle-like Si-Mg-Cu clusters.In further aging evolution,the aggregation of Si,Mg,Cu atoms promotes the growth of Si-Mg-Cu structures,and some Si-Mg-Cu structure is converted into lath-like Q′phase with generation of the Cu-rich structure.关键词：3DAP;First-principles;Al-Si-Cu-Mg Alloy;Aging;Cluster;Precipitation
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发布时间：2023-12-18 - 摘要：NiTiCu shape memory alloys were prepared by conventional tungsten arc-melting technique.The metallographic morphologies,phase constituent,wettability,microhardness and corrosion resistance of the NiTiCu ingots prepared were investigated by optical microscope,X-ray diffraction（XRD）,contact angle tester and microhardness tester.The results show that the NiTiCu alloys are composed of B2 austenite phase and B19′martensite phase,and the diffraction intensity of the B19′martensite phase is increased with increasing in the contents of Cu.The NiTiCu ingots exhibit typical as-cast metallography,such as bulky equiaxed crystals at the center of ingot,the small equiaxed crystals at the edge and columnar crystal at the middle.The contact angle of the NiTiCu alloys is increased with increasing in the contents of Cu.At the same time,the microhardness of the NiTiCu alloys is decreased.The Cu contents have a little positive effect on the corrosion resistance of NiTiCu alloys in the artificial saliva.关键词：NiTiCu Shape Memory Alloy;Tungsten Arc-melting;Dental Materials
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发布时间：2023-12-18 - 摘要：The Ti35Zr30Be27.5-xCu7.5Cox（x=3.5%,7.5%,11.5%）bulk amorphous alloys rods with 12 mm in diameters were prepared by copper mold casting method.Effects of Co content on the structure,glass-forming ability and thermal stability were investigated using X-ray diffractometer（XRD）and differential scanning calorimeter（DSC）.The results show that with the substitution of Co for Be,glassforming ability（GFA）is significantly enhanced and amorphous rods with a diameter of up to 12 mm are produced with 3.5%and 7.5% Co.With increasing the Co content from 7.5%to 11.5%,the GFA is sharply declined to less than 5mm.However,the glass transition temperature,Tg,and the crystallization temperature,Tx,of Ti35Zr30Be27.5-xCu7.5Cox（x=0,3.5%,7.5%,11.5%）alloys are decrease from 636 Kand 718Kto 612 Kand 647K,respectively.Effects of Co addition on the structure of the Ti35Zr30Be27.5-xCu7.5Cox（x=0,3.5%,7.5%,11.5%）alloys were described.关键词：Ti-Based Bulk Amorphous Alloy;Glass-Forming Ability;Thermal Stability
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发布时间：2023-12-18 - 摘要：Effects of filler content（iron powder and aluminum powder）on the mechanical properties of the E-44 epoxy resin were investigated.The results indicate that the compression strength and the tensile strength of the resin materials reach 80 MPa and 2730MPa,respectively,with iron powder to E-44 resin of（34.2）∶1and aluminum powder to E-44of（23.2）∶1,meeting the strength requirement of common ejection mold.The strength of filler material is decreased with the mass ratio of filler content and E-44 epoxy resin increase.关键词：Iron Powder;Aluminum Powder;Filler;Resin Material
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发布时间：2023-12-18 - 摘要：Silica granules have good wettability to silicon melt,and could be used as seeds to grow fine and well-distributed columnar silicon grains for high-performance multi-crystalline silicon（MC-silicon）related with high conversion efficiency of the solar cells.Si3N4 was coated to the silica granules for improving the MC-silicon growth and ingot releasing effect.It is found that the Si3N4 coating on the silica granules is helpful for obtaining fine and uniformly distributed columnar grain to decrease the defect density and improve the quality of multi-crystalline silicon.In addition,the detachment of the silica granules from silicon ingot is realized easily to eliminate the stress from the bonding of multi-crystalline silicon with silica granules.关键词：High-Performance MC-Silicon;Si3N4Coating;Silica Granules
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发布时间：2023-12-18 - 摘要：Effects of Ti、V、Nb、Mo on the morphology,hardness and impact toughness of carbides in high Cr alloy containing 2.8%carbon and 31.0%chromium were investigated.The results show that with the increase of alloy contents,the carbides size is gradually refined firstly and then coarsened,and hardness and impact toughness are increased firstly and then decreased.When the amounts of alloy elements are 0.4%Ti、0.4%V、0.4%Nb、0.35%Mo,the hardness and comprehensive mechanical properties exhibit desirable,where hardness and impact toughness reach up to 58.9HRC and 11J·cm-2,respectively.关键词：High Chromium Alloys;Carbides;Properties;Ti;V;Nb;Mo
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发布时间：2023-12-18 - 摘要：<正>近日,宁夏维尔铸造有限责任公司生产的液力缓速器转子在"2014年中国国际铸造博览会"上荣获优质铸件金奖特别奖。液力缓速器转子,形状复杂,叶片尖角只有0.03mm,整个部件只能采用铸造成形的方法来获得,机械加工无法加工,因而难度极大。该工艺技术目前属于铸造行业的重大技术难题。
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发布时间：2023-12-18 - 摘要：<正>6月6日,一辆巨大的平板车缓缓驶出忻州日发重型机械有限公司大门,车上装的是该公司承接的150吨龙门横梁铸件,正式交付客户。这件重达150吨的龙门横梁是位于忻府区庄磨镇的忻州日发重型机械有限公司为唐山渤海冶金设备有限公司加工的特大型铸件。该铸件长17.5米、宽2.26米、高2.18米,毛重150吨,整个产品体大、中空、壁薄（仅45毫米厚）,采用铸造一次性浇铸成型。这件150吨龙门横梁的承接、浇铸,意味着该公司已全面掌握了铸造领域先进的铸造技术——HJ350工艺,填补了我省、我市铸造领域的空白。该
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发布时间：2023-12-18 - 摘要：<正>北京环境监察总队负责人介绍,目前北京地区有100多家铸锻造企业,其中60%在通州,而大分部又分布在西集镇。"西集镇在百年前就有了铸锻造企业,并在改革开放之初形成规模集群,堪称‘铸造业之乡’。"西集镇现在有五六十家铸造企业,去年拆除12家,今年将停产37家,32家已经签订停产承诺书,并在今年9月底前全部停产。
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发布时间：2023-12-18 - 摘要：<正>年均消耗循环水1256万吨,成本高达700万元。面对这样一组惊人的数据,西南铝熔铸厂以运营转型为抓手,开展降低循环水项目,该项目实施以来累计创效200余万元。熔铸厂作为西南铝的用水大户,每年的循环水量消耗巨大。经过认真分析,西南铝熔铸厂发现,循环水利用率偏低的原因在于铸锭结晶器结构老旧,于是,该厂从改进工装工具入手,用整体式结晶器技术替代老式的方锭结晶器结构,提高了循环水利用率,降低了冷却水的需求量。
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发布时间：2023-12-18 - 摘要：<正>4月29日,中国大洋矿产资源研究开发协会与国际海底管理局在北京签订国际海底富钴结壳矿区勘探合同,标志我国具有专属勘探权和优先开采权的富钴结壳矿区已经完成所有法律程序。合同为期15年,合同区位于西北太平洋海山区,面积3000平方公里,限定在长度550公里、宽度550公里的范围内。中国大洋协会秘书长金建才和国际海底管理局秘书长涅·艾洛提·奥敦通代表双方在合同文本上签字,外交部、国土资源部、国家海洋局等有关部门负责人出席活动。目前,国际海底管理局共收到26份矿区申请,其中已签订勘探合同或获得核准的有19份。
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发布时间：2023-12-18 - 摘要：<正>2014年4月3日上海通用汽车中国前瞻技术科研中心宣布,镁合金专用立式挤压铸造机现已安装调试完毕,并且成功完成了首批工艺验证零部件的试制工作,这标志着通用汽车在汽车轻量化研究方面取得了新的突破。镁合金立式挤压铸造机是由通用汽车全球研发中心旗下的轻质材料研究团队和通用汽车中国科学研究院轻量化技术研究团队联合设计,并且和中国本地设备供应商共同开发研制而成。作为先进的镁合金专用立式挤压铸造系统,该设备不仅通过立式挤压提高了铸件致密度,更通过对镁合金原料的保护气氛熔化与气密传输消除了氧化夹杂等缺陷,从而大幅提高了铸造镁合金汽车零部件的性能与品质。
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发布时间：2023-12-18 - 摘要：<正>由苏州市压铸技术协会主办,苏州金韵压铸科技有限公司承办的"2014夏季压铸培训班",于7月18日开学,7月22日圆满结业。此次培训班为期4天,开设了《压铸概论》等课程,共有11位专家参加了授课,吸引了全国各地34家企业的73名学员参加。培训班在最后一天,进行了现场答疑。
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发布时间：2023-12-18 - 摘要：<正>在烟台召开全国铸造机械标准化技术委员会换届暨标准评审工作会议,对在第四届委员会工作期间表现突出的标准化分技术委员会和10名标准化工作者进行了表彰,其中,挂靠在力劲集团·深圳领威科技有限公司的金属热成形标准化分技术委员会荣获唯一"标准化工作先进集体"称号,分技术委员会徐年生、
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发布时间：2023-12-18 - 摘要：Semi-solid 2024 aluminum alloy billet was prepared by recrystallization and partial remelting technology.Microstructure evolution was observed at different remelting temperature and holding time,and effects of processing parameters on grain size and spheroidization rate were analyzed.Based on thixo-forming casting,the difference of mechanical properties was described at varied position on the samples with different billet height.The results show that microstructure of the billet gradually undergoes the disappearance of extruded fibrous tissue,the generation ofα-Al recrystallized grains and the spheroidization and growth ofα-Al grains with increasing in holding time,and the process is accelerated with the remelting temperature increase.The size and spheroidization rate of the semi-solid grains are increased with the increase of remelting temperature and holding time.The average grain size with approximately 75μm and spheroidized rate of 0.74 can be obtained at 613621℃for 2030min,and the tensile strength of the thixoforming parts can be reached up to 383 MPa.The tensile strength exbibits greatly different at different position due to the parts shape and forming characteristics.关键词：2024 Alloy;Recrystallized and Remelting Method;Structure Evolution;Thixoforming
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发布时间：2023-12-18 - 摘要：Effects of compound modification and isothermal heat treatment on microstructure and properties of in-situ Mg2Si/Al composites were investigated by compound modification of P and mischmetall and adjusting the insulation temperature and holding time of semi-solid isothermal treatment.The results indicate that after P and mischmetall compound modification,the massive cross-shaped morphology of Mg2 Si primary phase in the composites is transformed into irregular polygons,which are uniformly distributed in Al substrates.The average size of primary phase is decreased from about 83μm before modification to about 17μm.The morphology of Mg2 Si primary phase andα-Al phase is transformed into near-spheric shape after semi-solid isothermal treatment at 570℃for 90 min,and the shape factor of Mg2 Si primary phase reaches up to approximately 0.96 with an average size of about 16μm.Meanwhile,the brinell hardness of the composites reaches a maximum of 106 HB.关键词：In Situ Mg2Si/Al Composites;Compound Modification;Semi-Solid Isothermal Heat Treatment
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发布时间：2023-12-18 - 摘要：Semi-solid microstructural evolution of extruded Mg-5.5Zn-2Gd-0.6Zr magnesium alloy with different extrusion ratio by the SSIMA process was investigated.It is found that the relationship between the average diameter ofα-Mg grains and the isothermal holding time meets the difference between the cube of average grain diameter and initial average grain diameter equal to the coarstning constant K and the isothrmal time t under the condition of the same extrusion ratio.The coarsening rate constant K is decreased with the increase of the extrusion ratio,which reaches 359μm3/s,289μm3/s and 266μm3/s when the extrusion ratio is 10,15 and 30,respectively.It is also found that the semi-solid isothermal evolution process of the experimental alloy is accelerated with the increase of the extrusion ratio,meanwhile,the roundness and uniformity ofα-Mg grains also are improved.关键词：Extruded Magnesium Alloy;Simple Strain-Induced Melt Activation（SSIMA）Process;Semi-solid Forming;Coarsening;Microstructure
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发布时间：2023-12-18 - 摘要：The roller manufactured by liquid die forging technology was conducted.And according to the theory of materials mechanics and solidification,the quantitative calculation model of the start-pressure time and the hold-pressure time of liquid die forging rollers was derived.Meanwhile,combining with the working principle of the liquid die forging technology of rollers,the pouring height of rollers during squeezing casting process was presented,and its computation formula was given.Through ProCAST to analysis the roller with the specification175mm×480mm and the verification test of smaller sample of the roller,absence of defects such as shrinkage cavities and porosities in the squeezing casting roller can be observed.关键词：Liquid Die Forging;Roller;Start-Pressure Time;Hold-Pressure Time;Pouring Height
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发布时间：2023-12-18 - 摘要：Based on Power-Cutoff model,using ProCAST casting simulation software,the die-casting process for magnesium alloy gearbox case at liquidus and semi-solid temperature region was analyzed.By orthogonal experiments,effects of plunger injection speed,casting temperature,mold temperature and the heat transfer coefficient between die mold and die castings on the defect rate were visualized,and the processing parameters were optimized.The results reveal that injection velocity on the maximum defect rate in die casting can be neglected,while lower injection speed can greatly reduce the total casting defect rate with ingate velocity between 4090m/s.Moreover,both the maximum and total casting defect rate can be significantly reduced with semi-solid casting temperature,higher mold temperature and lower heat transfer coefficient between die mold and castings.The optimized processing parameters were presented as follows:the plunger injection speed of 5m/s,pouring temperature of 570℃,mold temperature more than 200℃and heat transfer coefficient between die mold and castings of 500W/（m2·K）.关键词：ProCAST Software;Gearbox Case;Power-Cutoff Model;Process Optimization;Defect Rate
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发布时间：2023-12-18 - 摘要：It is a key factors of good spraying of mould lubricant for obtaining excellent surface quality of the castings.However,the used spraying techniques could not cover the whole surface of the mould,leading to the occurrence of poor spraying effects,partial soldering and pull-failure.Through adopting inner-spraying technology,the problems can be eliminated effectively.The inner-spraying apparatus is composed of spraying channel designed in the mould and an atomizer,exhibiting the features of fully utilizing the pipeline and control unit on the die casting machine.Atomizer directly connect with coating pipe and gas pipe on spraying robot in one end,and connect with inlet of inner-sprayed channel in the mould in other end,realizing the synchronous operation with spraying robot on the die casting machine.The practical verification reveals that the inner-spraying technique can greatly decrease the scrap rate of the die castings.关键词：Automatic Spraying;Man-Spraying;Inserted-Core Spraying;Soldering;Atomizer
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发布时间：2023-12-18 - 摘要：The low pressure casting process for thin-walled Al alloy shell as a crucial structural component was designed,and the filling flow pattern,temperature field and shrinkage porosities（holes）in thin-walled aluminum alloy shell were simulated to optimize the low pressure casting process.The simulated results show that with copper core instead of steel core,the stable filling flow and uniform temperature distribution can be visualized,and the shrinkage porosities（holes）are visualized to be distributed out the shell.The optimized casting process can optimize effectively temperature field and reduce the possibility of shrinkage holes（porosities）,obtaining the qualified shell with high quality.关键词：Thin-Walled Al Alloy Shell;Numerical Simulation;Temperature Field;Shrinkage Porosity
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发布时间：2023-12-18 - 摘要：<正>智利《战略报》2014年6月8日报道,据智利铜业委员会预测,未来两年内世界铜价将趋于稳定,2014年铜平均价预计达3.05美元/磅,2015年达3美元/磅。该机构预测数据主要综合了中国经济增速放缓,对铜需求下降、世界铜供应量和主要铜产国产量等因素。预计今明两年中国铜需求增长率将保持在4.5%左右。2014年世界铜供应量将增长5.5%,2015年增长3.9%。在此背景
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发布时间：2023-12-18 - 摘要：<正>日前,英国制造企业Renishaw同英国Empire Cycles公司联合,成功打造出世界上第一台3D打印的钛框架MX-6Evo山地自行车。虽然欧洲航空防务航天公司（EADS）已经成功制造出3D打印的聚酰胺纤维自行车,但当谈及到制造自行车框架的高强度质量比材料时,钛几乎是众多材料中的首选,但钛框架的价格也十分昂贵。或许钛框架在未来会降价,但如果现在就拥有价格低廉的钛框架自行车将会是一件非常棒的事情。
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发布时间：2023-12-18 - 摘要：<正>据外电6月10日消息,HarborAluminumIntelligence总经理JorgeVazquez在芝加哥一会议上表示,今年全球铝市供应缺口在117.6万吨,大于去年的45.8万吨。2015年铝产量缺口将达108.6万吨。缺口最大的地区将在美洲。2015年北美需求增幅将扩大至6%,今年增幅预估为5.7%,2013年增幅为3.6%。由于伦敦金属交
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发布时间：2023-12-18 - 摘要：Different protective methods of the gypsum mold for gravity casting of magnesium alloy were analyzed comparatively.The results show that manufacturing process by using borate and gypsum powder mixed protection is simple,however,it may affect cure of gypsum slurry.By using manufacturing process of watering borate after mold baking,the oxidation on casting surface exhibits serious.Manufacturing process by watering borate after borate and gypsum powder mixing baking exhibits the oxidation-free and desirable ignition-proof efficiency,however,due to increasing procedure,the method is only suitable for the small batch of production of magnesium alloy parts.关键词：Magnesium Alloy;Gypsum Mold;Ignition-Proof;Gravity Casting
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发布时间：2023-12-18 - 摘要：The comparison sampling,measurement and analysis of full mold lost foam EPS products pattern outer surface,inner surface of coating layer shell and outer surface of cast iron products were processed with the help of non-contact 3Droughness profile optical analyzer.Evaluation length for sampling was set to 14.623 mm,and assessment area for sampling was set to 1.703 1cm2,and cast iron surface profile roughness critical value Lc（cut of wavelength）was set to 800μm.Measurement data shows that the average line roughness value Rareaches 10.717 1μm,5.846 3μm and 5.923 5μm,respectively,and the average surface roughness value Sareaches 17.500 4μm,9.476μm and 10.139 8,respectively.The inner surface roughness physical characterization of the coating layer shell is more relative with full mold lost foam casting,which may directly affect the surface roughness values.The effects influence of coating room temperature contact angle and liquid metal high-temperature contact angle on EPC casting surface roughness were analyzed.关键词：Lost Foam Casting;EPS Pattern;Coating Layer Shell;Contact Angle;Surface Roughness
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发布时间：2023-12-18 - 摘要：Characteristic of duplex stainless steel,dimensional parameter of sleeves and centrifugal casting technique were described.Key points in preventing crack,double skin and air hole were presented.Through decreasing centrifugal speed,it is effective for preventing hot crack,however,heat reserving capacity of the mould should be improved to prevent liquid alloy from overflowing.During solidification process of 1.4460 duplex stainless steel,rotating speed could be further decreased.Meanwhile,increasing pull-mold temperature,hot crack could be relieved.Through increasing mould temperature,adopting conch gate with analogy gradation section and controling initial pouring speed to meet initial thickness,double skin in castings such as cast steel jacket with small caliber could be eliminated.关键词：Duplex Stainless Steel;Centrifugal Casting;Sleeves With Small Caliber;Defect Prevention
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发布时间：2023-12-18 - 摘要：A three-dimensional flow,heat transfer and solidification coupling mathematical model of ultrathick slab mold was established.According to the actual working condition of slab,effects of the width and thickness change of ultra-thick slab mold on flow and temperature field in mold were analyzed.The results show that with the increase of width of the mold,impacting depth of the liquid steel on the shell is increased and impacting intensity is weaken.Compared with continuous casting conventional slab,liquid surface velocities of the ultra-thick slab are decreased,and then it is decreased with increasing in mold width.In addition,there exists a low flow velocity zone at the nozzle,which is harmful for the protective slag melting.With the increase of mold width,shell thickness tends to uniform.Impact strength of liquid steel at the center is the main reason affecting the uniformity of the shell.With the increase of thickness,impact on the shell of narrow side and velocities of the liquid surface is weaker,while depth of impingement keeps constant.With the increase of thickness,shell heterogeneity becomes serious.The uniformity of the shell is controlled by uniformity of temperature field.关键词：Ultra-Thick Slab;Mold;Flow Field;Temperature Field;Section Size
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发布时间：2023-12-18 - 摘要：Based on the finite element method,temperature field in casting process the 1st round billet casting machine from the Baotou Steel company were analyzed to find a proper location for positioning the final electromagnetic stirring（F-EMS）stirrer.Through applying transient magnetic field analysis method,the distribution of magnetic flux density and electromagnetic force in the bloom during stirring process was analyzed,and process parameters of F-EMS were optimized.With a casting speed velocity of 0.45m/min,specific water flow of 0.18L/kg and superheat value degree of 25℃,the optimized electric stirring parameters for round bloom with 430 mm in diameters were presented as follows:current of 250 A,frequency of 10 Hz.Magnetic flux density in the stirrer under no-load was measured.The results were well in agreement with simulated ones.关键词：Bloom;Secondary Cooling Zone;Electromagnetic Stirring;Numerical Simulation
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发布时间：2023-12-18 - 摘要：The fine grained Cu-Sn and Cu-Sn-Fe alloys were prepared in a copper mould with a high cooling rate,and effects of Sn and Fe compound alloying on the tensile strength of casting and rolling Cu-SnFe were investigated.The results show that the tensile strength of Cu-Sn-Fe can be increased markedly by compound alloying and rolling.The mechanism of compound alloying and rolling was described.关键词：Cu-Sn Alloys;Cu-Sn-Fe Alloys;Alloying;Rolling
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发布时间：2023-12-18 - 摘要：Effects of magnetic field and intensity of electromagnetic stirring on solidification structure and macro-composition segregation of Pb-80 Sn cast ingots were investigated.The results show that spiral magnetic field has a better effect in improving the solidification structure and macro composition segregation through promoting a large zone stirring for alloy melt to make the solute and temperature field distribution more uniform.At a fixed frequency,the solidification structure exhibits desirable when the current is 125 Afor rotating magnetic field and 100 Afor spiral magnetic field,where the grain sizes are reduced to 152.6μm and 143.2μm from 247.5μm without magnetic field,respectively.The composition segregation is relieved greatly when the current is 125 Afor both rotating and spiral magnetic field,reduced to 1.37%and 0.28%from 9.71%in the absence of magnetic field,respectively.关键词：Magnetic Field Intensity;Solidification Structure;Pb-80Sn Hypereutectic Alloy
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发布时间：2023-12-18 - 摘要：The wettability and interfacial reactions between Sn-0.7Cu solder and Cu substrate were investigated under thermoelectric coupling field.Effects of different current density in range of 1.54.5A and temperature in range of 250350℃as well as polarity of the Cu substrate on wettability and interfacial reaction between Sn-0.7Cu solder and Cu substrate were investigated by measuring wetting angles and observing sectional morphology of the series samples prepared.The results indicate that at fixed other processing parameters,the wettability between Sn-0.7Cu solders and the Cu substrates can be improved with temperature increase,and the increasing of the current can decrease the wettability angles.In addition,the substrate as anode also can improve the wettability.关键词：Sn-0.7Cu Solder;Wettability;Interfacial Reaction;Thermoelectric Coupling
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发布时间：2023-12-18 - 摘要：H65,BZn18-26 and QSn6.5-1scraps were used to prepare lead-free free-cutting Si brass to substitute for HPb59-1.Effects of Si on the structure of brass prepared were investigated.The results show that the Si content in the brass is related obviously with the microstructure of the brass.With the Si content of 0.2%0.6%in the alloy,the alloy is composed ofαphase in board strips shape mainly andβphase,and the amount ofβphase is increased with the increase of Si content.When Si content is0.8%,the matrix isβphase in polygon,andαphase is distributed in grains and boundary.When Si content is 1.0%,the matrix isβphase with a large number of phases in small particle and blocks.It is speculated according to the atomic percentage that the phases belong to composites Cu5Si+βor Cu2Mg+βin tiny granular,and with the increase of Si content,small granular phase is increased significantly.关键词：H65 Scraps;Lead-Free;Silicon Brass;Structure
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发布时间：2023-12-18 - 摘要：<正>第八届世界铸造高层论坛将于2014年9月26日27日在意大利水城威尼斯举行。论坛由欧洲铸造协会（CAEF）和欧洲铸造设备供应商协会（CEMAFON）联合主办,每两年举办一次,中国铸造协会是论坛的主要支持协会。世界铸造高层论坛的宗旨是深入分析汽车、工程机械、能源等全球铸造业主要下游市场的发展趋势,交流各国铸造业发展现状,研究新技术对铸造业的影响,进而探讨世界
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发布时间：2023-12-18 - 摘要：<正>6月20日,为了帮助广东省铸造行业企业顺利通过《行业准入》认定,由广东省铸造行业协会主办的广东省铸造行业准入研讨会在顺德顺利召开。出席本次大会的有:协会副会长、肇庆飞亚实业有限公司梁永康总经理,东莞石碣华丰金属有限公司梁焕操董事,中山市广重铸轧钢有限公司张卫东副总经理,阳山县联合铸锻有限公司何桂景董事长,协会秘书长李业军,协会原秘书长、专家委员会成员刘志权,协会副秘书长、专家委员会主任、华南理工大学赵海东教授,协会副秘书长、广东鸿图黄杰枫副总经理,华南理工大学吴春苗教授等。来自20多家企业的50多名代表参加研讨会,共同探讨和推进行业准入的实施。研讨会上,吴春苗教授和原秘书长刘志权分别从压铸
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发布时间：2023-12-18 - 摘要：<正>第九届中国国际压铸展览会在2014年7月22-24日于上海新国际博览中心隆重举行。此届展览会盛况空前,是历年来最成功的一届展览会,共计吸引了6,896名专业观众,参展商数量达155家;展览面积为12,340平方米,较上届增长约30%。本届展会吸引了来自韩国、日本、台湾、香港、德国、印度、泰国、马来西亚、美国、俄罗斯、澳大利亚、伊朗、乌克兰、巴西、哥伦比亚、新加坡、奥地利、加拿大、克罗地亚、法国、土耳其、英国、越南、中国大陆共计24个国家和地区的压铸企业前来参观。秉承着搭建中外
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发布时间：2023-12-18 - 摘要：<正>由中国机械工程学会、世界铸造组织压铸委员会、世界铸造组织非铁合金委员联合主办,中国机械工程学会铸造分会和铸造行业生产力促进中心承办的第九届中国国际压铸会议和第1届有色合金及特种铸造技术国际论坛于2014年7月19-22日在上海成功举办。7月20日上午举行了会议开幕式。中国机械工程学会铸造分会秘书长苏仕方主持了开幕式,中国机械工程学会铸造分会副理事长、压铸技术委员会主任、清华大学教授熊守美代表主办单位致开幕辞,中国机械工程学会铸造分会常务理事、特种铸造及有色合金技术委员会主任、世界铸造组织非铁合金委员会主任、哈尔滨工业大学教授苏彦庆代表主办单位致欢迎辞。
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发布时间：2023-12-18 - 摘要：<正>第五届全国铸造机械标准化技术委员会第一次工作会议暨标准审查会于2014年7月21日至25日在山东省烟台市召开。中国机械工业联合会标准工作部副主任谭湘宁、全国铸造机械标准化技术委员会主任委员刘继广及委员和特邀代表共84人出席了会议。会议由秘书长卢军主持。中国机械工业联合会标准工作部谭湘宁宣读了国家标准化管理委员会办公室文件标委办综合[2014]54号文"国家标准委办公室关于第五届全国铸造机械标准化技术委员会换届及组成方案的批复"的文件,并向被聘委员颁发了国家标准化管理委员会的委员聘书。中国机械工业联合会标准工作部谭湘宁在会上作了重要讲话。谭湘宁首先代表中国机械工业联合会对第五届全国铸造机械标准化技术委员会的成立表示祝贺。谭湘宁回顾了铸造机械
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发布时间：2023-12-18 - 摘要：<正>中国汽车压铸产业链的创新驱动转型发展必然要走智能化、数字化、信息化、轻量化的道路。这次论坛的主题就是围绕以上"四化"展开论坛。预计有260人左右参会。1.征文内容:见如下论坛内容（论文征集截止时间为2014年10月16日）。2.论坛内容:（1）压铸机新产品研发;（2）模具设计新技术;（3）压铸新工艺:（4）真空压铸新技术:（5）压铸结构件新技术:（6）机器人在压铸生产中的应用;（7）中国汽车技术的新发展;（8）数字化制造;（9）创新管理;（10）镁合金压铸的新发展;（11）汽车制造的轻量化。
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发布时间：2023-12-18 - 摘要：Using carbon steel（0.45%C）as matrix,and high carbon ferrochrome as cast-infiltration agent,the steel-based surface composites were fabricated by conventional cast-infiltration process combined with the thermite reaction.Influences of various processing parameters such as pouring temperature,the placement location,the content of aluminum and the binder on formation of cast-infiltration layers were investigated.The results show that the interfacial bonding belongs to metallurgical fusion between cast-infiltration layer and the matrix,and the cast-infiltration composites mainly consist of M7C3,Cr7C3,Al2O3,when the pouring temperature is 1 650℃.The high-quality cast-infiltration composite layer can be prepared with the preforms embedded in the lower part of the mold wall.The desirable surface quality of cast-infiltration layer can be obtained without any binder.关键词：Cast-Infiltration Composite Layer;Pouring Temperature;Binder
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发布时间：2023-12-18 - 摘要：The wear behavior at high temperature of Al2O3 ceramic reinforced 20Cr25Ni20 matrix composites prepared by squeeze casting at 500℃ were investigated,and it was compared with the matrix material 20Cr25Ni20 and other several common roll materials.The results reveal that the Al2O3p/20Cr25Ni20 composites exhibit a better wear resistance,with the specific pressure of 7.95 MPa,which is about 3.4times higher than the matrix materials,and higher than Cr25 high chromium cast iron by 46%.However,the wear resistance of YG10 cemented carbide is 6.5times higher than Al2O3p/20Cr25Ni20 Composites.The matrix materials present serious plastic flow and cutting after high temperature wear,while Al2O3 ceramics plays a good role as the abrasion phase.关键词：Heat-Resistant Steel Matrix Composites;High Temperature Wear;Roll Material
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发布时间：2023-12-18 - 摘要：A biomedical Ca/P film on pure Ti was prepared by micro-arc oxidation in the Ca/P electrolyte systems with different concentration.The surface micro-topography and 3-D morphology were observed by SEM and HIROX.The relationship of porosity ratio,density,size and 3-D morphology with electrolyte concentration was investigated under the condition of the given Ca/P ratio electrolyte.The results show that with the electrolyte concentration increase,the thickness is increased and the porosity ratio,pore size as well as pore density are decreased.In low concentration,the surface of the film exhibits more crater-like porous structure,however,in high concentration,the porous structure is formed by the sintering process of melt repeatedly.Effects of NaOH concentration on the ceramic film is more important.关键词：Ti;Micro-arc Oxidation;Electrolyte Concentration;NaOH
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发布时间：2023-12-18 - 摘要：The corrosion behavior of Mg-15 Y magnesium alloy after aging at different temperature and time in 3.5% NaCl solution was investigated,and corrosion mechanism of the alloy was described.The results show that the peak aging time of Mg-15 Yis 12hat 225℃,where the hardness of the alloy reaches the maximum values.And then with increasing in aging time,the hardness of the alloy is decreased to approximately 110.The corrosion depth and the hydrogen evolution are gradually increased with increasing in soaking time.At a fixed soaking time,the corrosion degree and the hydrogen evolution rate are increased firstly and then decreased with increasing in soaking time,while the corrosion potential and corrosion current of the alloy are decreased firstly and then increased.At the same temperature,corrosion morphology change can be neglected with postponing aging time,however,hydrogen evolution rate is decreased firstly and then increased.关键词：Aging;Mg-15Y Alloy;Corrosion
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发布时间：2023-12-18 - 摘要：Filling,solidification and stress formation in process of trial-producing AC7 Aaluminum alloy frame were simulated by the ADSTEFAN software to solve the practical problems.The results reveal that the severe heterogeneous flow in ingate take a dramatically temperature distribution difference in the frame to lead to the generation of severe casting stress and strain,which is responsible for the crack occurrence.Based on the simulated result,casting parameters were optimized to realize more rational pouring and solidification process,and equivalent stress and strain are decreased by 10%and 20%,respectively,eliminating the hot crack defects in the AC7 Aaluminum alloy frame.关键词：AC7A Aluminum Alloy;Low Pressure Casting;Frame;Simulation
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发布时间：2023-12-18 - 摘要：Abnormal mechanical properties of forged 6061 wrought aluminum alloy wheel could be analyzed after T6 heat treatment.Effects of different working stages and T6 treatment on mechanical properties of the wheel were analyzed.In addition,the origination of abnormal mechanical properties was described.The countermeasures of eliminating abnormal mechanical property data were presented through adjusting heat treatment processes.关键词：6061 Wrought Aluminum Alloy;Wheels;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The casting process for small batches of V12 aluminum engine block was developed.The technical problems and operation challenges including handmade complex geometry sand core,position structure for big size sand core,gate and riser design,and so on,were solved successfully.The developed process is suitable for the manufacturing V12 aluminum engine block.关键词：V12 Aluminum Block;Sand Core;A357Alloy
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发布时间：2023-12-18 - 摘要：2024aluminum alloy with Ag-free is an important precipitation strengthened alloys.TheΩphase can be precipitated by cold rolled at room temperature and duplex ageing.The precipitation mechanisms ofΩphase in 2024 aluminum alloy was explored by transmission electron microscopy（TEM）,energy spectrum analysis and other methods.The results demonstrate that duplex ageing and cold rolled technigue are the effective process to promote the precipitation ofΩphase.The concentration decrease of Mg and a large number of nucleation sites around Tphase are mainly responsible for the precipitation ofΩphase.关键词：Ω Phase;2024 Aluminum Alloys;Precipitate Behavior;HAADF
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发布时间：2023-12-18 - 摘要：<正>20140801 Emami S M,Divandari M,Hajjari E,et al.传统复合铸造与消失模复合铸造Al/Mg合金双金属材料的对比研究.International Journal of Cast Metals Research,2013,26（1）:43-50.复合铸造能够将两种或两种以上具有不同性能的金属材料铸成一个完整的铸件,从而使其不同部位具有不同性能,以满足其特殊的使用要求。但该方法同时也存在着界面氧化、不良金属间化合物析出等问题。消失模铸造与复合铸造两种工艺的结合,能够有效解决传统复合铸造中产生的问题。将一种金属材料以固态形式镶嵌于发泡模型中,再将另一种液态金属材料浇入,能够实现异种金属的连接。以Al/Mg金属为例,通过组织分析和显微硬度测试比较了传统复合铸造与消失模复合铸造的各自特点。研究发现,两种方法均可实现Al和Mg的复合铸
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发布时间：2023-12-18 - 摘要：<正>20140801一种消失模铁板平面固定架,CN203371000U,2014.01.01,唐山丞起汽车零部件有限公司.一种消失模铁板平面固定架,用于消失模铸造中固定泡沫模型的装置技术。由平面铁板构成,铁板的外周边缘与消失模的外周边缘相匹配,铁板的下表面通过热熔胶与消失模粘接固定,铁板通过热熔胶与浇道粘接固定。在使用时,根据铸件模型的形状尺寸和浇注位置,用热熔胶将消失模、浇道、铁板平面固定架按规定形状和位置粘接固定在一起,固定浇道,防止消失模变形。本装置具有固定可靠效果好、重复利用费用低、操作简单效率高、适用范围广的优点,在铸造中能够防止消失模变形,提高铸造质量和效率,降低生产成本。
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发布时间：2023-12-18 -
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- 摘要：<正>起始于2000年的中国铸造活动周是专家、学者和铸造工作者交流学术观点,传播先进技术、实用成果和信息,获取解决管理、生产、技术等关键性问题良策,了解行业发展现状,展望行业发展,开展经贸洽谈的综合平台,因其特有的形式、丰富的内容、良好的效果、旺盛的人气,得到业界人士的广泛认可与好评,成为我国铸造行业的年度重要活动,吸引了广大业界人士的积极参与。中国铸造活动周对促进我国铸造行业的发展与进步起到了重要的作用,并连续被中国机械工程学会评为"年度最具影响力综合活动平台"。2014中国铸造活动周将于2014年10月25-28日在河南郑州举行,本次学术与技术交流活动内容丰富、形式多样、参会人员广泛,届时将有来自国内外专家、企业家约600余人出席活动,是学习和了解新观点、新技术、新工艺、新材料、新设备等的极佳机会。真诚邀请广大铸造工作者莅临2014中国铸造活动周,并积极投稿;真诚邀请相关单位积极组织参展。
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发布时间：2023-12-18
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