最新刊期
卷 32 ， 期 8 ， 2012
- 摘要：Influences of strain rate on superplasticity of TA15 alloy were investigated by constant strain-rate tensile method.The results show that the elongation is increased gradually with decreasing in strain rate at 900 ℃ and strain rate in range of 3.3×10-4～1.1×10-2 s-1,and the maximum elongation of 1074% can be observed,and the better superplasticity can be also obtained at the high strain rate.Moreover,the extensive strain hardening stages appear in the curves of strain-stress.The lower the strain rate is,the longer the strain hardening stage is,and it is in favor of superplastic deformation.The microstructure observation shows that the strain rate is closely related with microstructure evolution.The lower the strain rate is,the more serious the microstructure coarsening is.Additionally,at the high stain rate,lots of new fine equaxied α phase appear in the deformed region of the specimen as a result of dynamic recrystallization.关键词：TA15 Titanium Alloy;Superplasticty;Strain Rate;Dynamic Recrystallization
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发布时间：2024-04-01 - 摘要：Effects of different contents of RE（rich La） or Yttrium on morphologies of primary Mg2Si phases in Mg2Si/AZ91D composites were investigated.The results show that RE and Yttrium can all effectively refine the primary Mg2Si phases in Mg2Si/AZ91D composites,and the modification effect of Yttrium is superior to that of RE.Morphologies of the primary Mg2Si phases are changed from coarse dendrites to fine polygonal particles with 0.8% RE or Yttrium addition.Over-modification of the primary Mg2Si phases can be observed with RE or Yttrium addition to 1.2%,and primary Mg2Si phase is coarsened again.Modification mechanism is attributed to the enrichment of RE,Yttrium and their intermetallic compounds on the growth faces of the primary Mg2Si crystals restraining the growth of primary phase.关键词：Mg2Si/AZ91D Composites;Primary Mg2Si Phase;Modification;RE or Yttrium
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发布时间：2024-04-01 - 摘要：<正>近期,四川其亚铝业集团一期年产35万吨高精铝板带箔暨年产35万吨再生铝项目在峨眉山市奠基开工。据了解,该项目是经国务院批准,由国家发改委划入成渝经济区区域规划的工业主导产业重大项目之一,总投资102亿元,占地1400余亩。
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发布时间：2024-04-01 - 摘要：<正>由全国总工会、中国机械工程学会、装备再制造技术研究院、中国铸造协会等单位支持的第七届全国铸件缺陷修复新技术研讨会暨第二届全国铸造缺陷修复机操作技能总决赛,日前在京落幕。据悉,每年我国铸件废品率多达5%～15%,个别复杂、
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发布时间：2024-04-01 - 摘要：<正>一、工艺水平低,精密铸造产品质量差1.铸件裂纹问题严重。2.大型铸件偏析和夹杂物缺陷严重。大型铸钢件和大型钢锭在凝固结束后,在冒口根部、铸件的厚大断面存在宏观偏析、晶粒粗大问题。
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发布时间：2024-04-01 - 摘要：<正>据相关报道称,自2000年起,我国铸件产量平均每年以11%的速度增长,已连续12年居世界首位。12年来,中国铸造业取得了飞速发展。据统计,"十一五"期间,铸造企业共申请并获专利4000余项,其中发明专利2000项。
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发布时间：2024-04-01 - 摘要：<正>国务院新闻办发布的《中国的稀土状况与政策》白皮书指出,我国的稀土行业存在资源过度开发、生态环境破坏严重、产业结构不合理、价格严重背离价值等问题。白皮书承诺,我国将加强稀土行业的科学管理,促进稀土行业持续健康发展。
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发布时间：2024-04-01 - 摘要：<正>目前,我国铸造产业发展要迅速地实现转型,就必须做好以下几项工作:第一,全力贯彻执行《铸造行业"十二五"发展规划》;第二,在实施行业准入中促进行业结构优化,到2015年,使铸造企业从目前的3万家减少到2万家,到2020年再减少1万家,最终把企业数量控制在1万家以内;第三,不断
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发布时间：2024-04-01 - 摘要：<正>运用生物质原料生产纤维素乙醇成本过高,无法实现商业化大规模生产,是许多国家农业废弃物高附加值利用的重要难题。中国济南圣泉集团股份有限公司通过多年技术积累与攻关,将植物秸秆各种成分全部有效利用,同时使用了诺维信（Novozymes）公司提供的生产纤维素乙醇所需的酶制剂,
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发布时间：2024-04-01 - 摘要：The adhering sand behavior of high strength A357 aluminum alloy transition ring castings during the pouring and solidification process was analyzed.Through the metallographic microstructure observation,micro-hardness measurements,SEM（scanning electron microscope） and EDS（energy dispersive spectrometer） and mechanical properties testing,serious adhering sand defects area were analyzed and identified.The results show that interface chemical reaction nearby the sand burning area can not be observed,and the internal casting defects in the cavity belong to mechanical adhering sand by the X-ray diffraction,which is attributed to the capillary permeability and gas phase penetration effect as a result of high temperature melting aluminum strongly eroding the surface coating of resin sand mould.With adding resistant high temperature oxide into the coating and increasing the coating’s thickness,the severity of mechanical adhering sand among the interface area is relieved,improving greatly the mechanical properties of the A357 aluminum alloy transition ring castings.关键词：A357 Aluminum Alloy;Adhering Sand Defects;Transition Ring Casting;Resin Sand
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发布时间：2024-04-01 - 摘要：Effects of traveling field from a self-developed direct current motor on forming ability and solidification structure of ZL102 aluminum alloy radiator with 2 mm in minimum wall thickness were investigated.The results show that forming ability of ZL102 alloy can be improved with an proper magnetic field at 220～250 V with the help of self-developed linear motor,and the E-type thin-walled ZL102 castings with good surface quality and complete filling can be obtained.In addition,as a result of thermal effect and electromagnetic stirring effect of the traveling magnetic field,grain size of ZL102 alloy is refined,and microstructure is improved.Meanwhile,modification effect on the bottom of the castings is superior to that of the underside.关键词：Traveling Magnetic Field;Aluminum Alloy;Thin-walled;Forming;Solidification Structure
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发布时间：2024-04-01 - 摘要：Mg-6Al and Mg-10Al alloys were prepared under the condition of Ar protection at the cooling rate of 1 ℃/min,2 ℃/min,3 ℃/min,4 ℃/min and 5 ℃/min.Influences of slow cooling conditions on grain size and distribution and quantity of β-phase in Mg-6Al and in Mg-10Al alloys were investigated by OM（optical microscope）,SEM（scanning electron microscope）,EDS（energy dispersive spectrometer） and Image tool.The results show that,solidification microstructure of Mg-6Al and Mg-10Al alloys is composed of α-Mg 、β-Mg17Al12 phases with pit-shape or lamellar-shape and rod-shaped（α+β） eutectic structure.With the cooling rate decreasing from 5 ℃/min to 1 ℃/min,the grain size of α-Mg in Mg-6Al and in Mg-10Al alloys is increased from 195.7μm、180.4 μm to 318.7 μm、225.1 μm,respectively,and the quantity of β-Mg17Al12 phase is decreased from 24.56%、45.50% to 18.36% and 38.59%,respectively.关键词：Mg-Al Alloy;Eutectic Structure;Grain Size
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发布时间：2024-04-01 - 摘要：Graphite crucible containing SiC for aluminum melting was prepared by using flake graphite,silicon carbide,silicon powder and kaolin as raw materials.The specimens were sintered at 1 050 ℃,1 100 ℃,1 150 ℃ and 1 200 ℃ for 3 h,respectively.Then the oxidation resistance test was conducted at 700 ℃,800 ℃ and 900 ℃ for 6 h,respectively.The effects of SiC content,firing temperature,oxidation temperature and time on the oxidation resistance were investigated.The results show that the oxidation resistance is significantly improved with the increasing of the content of SiC,particularly in the higher oxidation temperature.The weight loss curve changes gently and the weight loss rate is lower for the specimen with the higher SiC content.The optimum firing temperature is 1 100～1 150 ℃.The weight loss rate increases with the increase of oxidation temperature and time,particularly in the temperature of 700～800 ℃.关键词：Graphite Crucible;SiC;Oxidation Resistance;Weight Loss Rate
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发布时间：2024-04-01 - 摘要：Microstructures and mechanical properties of as-cast,solution-treated and extruded novel Mg-6Gd-3Y-2Zn-0.5Zr magnesium alloy have been investigated by optical microscope（OM）,SEM（scanning electron microscope） and tensile testing.The results show that the as-cast microstructure of Mg-6Gd-3Y-2Zn-0.5Zr alloy consists of α-Mg matrix and the block-like long period stacking ordered structure（LPSO） phase distributed around α-Mg matrix.After solution treatment at 450 ℃ for 16 h,fine lamellar structure LPSO phases grows from grain boundaries to the interior of the grains.The distinct age hardening response in extruded Mg-6Gd-3Y-2Zn-0.5Zr alloy aged at 200 ℃ can not be observed,however,the extruded alloy exhibits high strength and ductility,and ultimate tensile strength（UTS）,yield tensile strength（YTS）and elongation reach 335 MPa and 276 MPa,17%,respectively.关键词：Magnesium-Rear Earth Alloy;Microstructures;Long Period Stacking Ordered Structure Phase;Hot Extrusion;Mechanical Properties
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发布时间：2024-04-01 - 摘要：The continuous extrusion cladding forming process of the Cu-Al wire was simulated by a two-dimensional FEM software to analyze metal flow,velocity distribution,the effective stress and strain distribution under die different diversion angle.The results show that with decreasing in diversion angle,metal flow exhibits more homogeneous,and extruding force is decreased,which is beneficial for saving energy and reducing cost.In addition,small diversion angle is helpful for improving the cladding quality of Cu-Al wire,and for decreasing stress aggregation to improve mould as well as for increasing deformation efficiency.The continuous extrusion forming of Cu-Al was conducted on TLJ400 extruded machine,and the experimental results are well in agreement with the simulated ones.关键词：Cu-Al Cladding;Continuous Extrusion Cladding;Numerical Simulation;Die Diversion Angle
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发布时间：2024-04-01 - 摘要：Aiming at the problems in difficult to precisely control the shape in injection molding process of compressor resin blade,which was used in aero-engine compressor low-speed test bench,the optimization of mould cavity was perfomed.The injection process of compressor resin blade was simulated by the Moldflow software,and the warping deformation displacement of the resin blade was presented.Furthermore,using the anti-deformation method with introducing the weight,optimization of the mould cavity and simulation verification were carried out.The results show that it can significantly improve the precision of compressor resin blade in injection molding process by using the anti-deformation method based on the weight way.关键词：Compressor Resin Blade;Anti-Deformation;Weight;Optimization of Mould Cavity
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发布时间：2024-04-01 - 摘要：γ’ phase evolution in the Ni-based single crystal alloy containing Re during heat treatment process and creep process was described by observing the morphology change of the alloy at heat treatment and aging at different temperature combining with the FEM analysis.The results show that γ’ phase like butterfly is precipitated from the matrix during solid solution process.And it grows in form of cubic structure during the first ageing process.With secondary ageing treatment,γ’ phase is slightly grown with the more regular arrangement.In addition,γ’ phase becomes coarse with the increase of cubic degree when it is first aged at different temperature.The rational heat treatment parameters were presented.关键词：Re;Nickel-Based Single Crystal Alloy;Microstructure Evolution;γ’ Phase Like Butterfly
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发布时间：2024-04-01 - 摘要：<正>通用汽车（General Motors,下称"GM"）与位于加拿大安大略省斯特拉斯罗伊的Meridian Lightweight Technologies公司以及俄亥俄州哥伦比亚市的俄亥俄州立大学合作,获得美国能源部约267万美元的资金支持,用来研发先进镁合金压铸技术。
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发布时间：2024-04-01 - 摘要：<正>日前,罗·罗公司开始在罗斯汉姆建设新的先进叶片铸造工厂,新工厂将为民用航空发动机制造先进的单晶涡轮叶片。英国商务大臣表示,该工厂的建立是罗.罗公司对国家制造业的贡献,不仅对罗.罗有益,
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发布时间：2024-04-01 - 摘要：<正>据相关报道称,拥有100年历史的铸造生产企业Somerset Foundries公司（位于美国宾夕法尼亚州萨默塞特）于近期向员工发出了正式的停业通知。据萨默塞特当地媒体称,企业会在12月30日将最后30名员工的薪酬付清后正式关闭。
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发布时间：2024-04-01 - 摘要：<正>西班牙铸造企业Wisco集团主要生产轴承、齿轮、法兰及众多铸件产品,公司计划将在印度浦那建造新的生产工厂,Wisco公司75%的产量用于出口,今年公司预计将非欧洲地区铸件出口量从500t提高至1000t。
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发布时间：2024-04-01 - 摘要：AutoCAD,UG and ANSYS are necessary software in designing aluminum wheel.The advantages and disadvantages of different file formats were described,and reciprocal conversion between the different file formats was conducted,effectively avoiding the data error and loss during file conversion.The limitations of single software using was overcome.关键词：Aluminum Wheel;AutoCAD;UG;ANSYS;File Reciprocal Conversion
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发布时间：2024-04-01 - 摘要：Effects of melt-treatment with low power ultrasonic,such as output power density,stirring time,ultrasonic vibration temperature and mould pre-heating temperature on microstructure of LC9 alloy were investigated.The results show that LC9 alloy with spherical or granular primary grain can be prepared by controlling parameters of melt-treatment with low power ultrasonic and solidification conditions.The size of primary phase tends to be decreased with increasing in ultrasonic power density within 0～5 W/cm2.With ultrasonic power density more than 5 W/cm2,the grain size change can be ignored.With the increase of stirring time or ultrasonic vibration temperature,grain size is decreased firstly,and then increased,and critical value of stirring time and ultrasonic vibration temperature is 45 s and 660 ℃,respectively.The grain size is increased rapidly with increasing in the preheating temperature of mold in range of room temperature to 450 ℃.The spheroidization effect of ultrasonic is weaken when the preheating temperature is higher than 300 ℃.关键词：LC9 Alloy;Ultrasonic;Melt Treatment
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发布时间：2024-04-01 - 摘要：Electric housing parts with 240 mm ×166 mm ×130 mm required compact structure,sound surface and meets the air tightness.Through modifying the processing structure,adding the guide baffle,setting two runner and adjusting partial wall thickness,and so on,the die-casting die was developed sucessfully.关键词：Die-Casting;Housing;Processing Structure;Die-casting Die
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发布时间：2024-04-01 - 摘要：Ratio between the total volume of overflow system and the total volume of the ADC12 die casting oil-filter seat was analyzed by the Flow-3D software.The results show that the size and position of the overflow system are closely related with die-casting filling,and gas-entrapment and oxides in the oil-filter seat can be reduced significantly when the volume of the overflow system is 29% of the total castings volume.关键词：ADC12 Aluminum Alloy;Die-Casting;Overflow System;CAE Analysis
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发布时间：2024-04-01 - 摘要：There exist deformations in the punch and die chamber during squeezing casting as a result of thermal-mechanical loading effects.Injection process of the vertical squeeze casting step plate was simulated by the ProCAST software.The deformation of the punch and die chamber was presented during the eight squeeze casting cycles,and the dynamic match gap was calculated out.The result shows that the radial sizes of the punch and die chamber are increased after being heated,and the expansion of the punch is higher than that of die chamber.The gap value is decreased from the initial 0.120 0 mm to 0.029 8 mm,and the reducing margin becomes smaller and smaller.Finally,the gap value tends to be stable.关键词：Squeeze Casting;Injection System;Dynamic Match;Numerical Simulation
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发布时间：2024-04-01 - 摘要：Influence of applied pressure on the elastic strain energy of Al-5.0Cu-0.4Mn alloys prepared by squeeze casting was examined by low cycle fatigue testing.The results show that the elastic strain energy density of the alloys are decreased during the cycle process,and with the increase of applied pressure,elastic strain energy density is decreased.The strain energy density of the alloy is closely related to the degree of strain amplitude.The alloy prepared under pressure exhibits a larger strain energy density at the same strain amplitude.The difference of strain energy density in low fatigue life zone is larger than that in high fatigue life zone.Meanwhile,the low cycle fatigue life is longer with a higher pressure.关键词：Aluminum Alloys;Low Cycle Fatigue;Squeeze Casting;Elastic Strain Energy Density
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发布时间：2024-04-01 - 摘要：According to the structure and performance of the motorcycle brake pump,it was manufactured by indirect squeeze casting.The mould structure and the processing parameters were provided.High-quality castings were produced with the injection pressure of 110 MPa,the filling speed of 0.18 m/s,the pouring temperature of 680～720 ℃,the preheating temperature of mould of 150～200 ℃ and the holding time of 10～12 s.关键词：Brake Pump;Squeeze Casting;Process Study;Mould Design
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发布时间：2024-04-01 - 摘要：In order to improve the quality of low pressure casting aluminum alloy wheel,monitoring and process capability of the products,Cpk for the key characteristics,important process parameters,product characteristics value in the production process was calculated by the Minitab software,and Cpk reaches 2.27 on flange diameter.Combining with the measurement system for detecting the frequency,product quality requirements were improved.关键词：Cpk;Low Pressure Casting;Aluminum Alloy Wheel;Minitab
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发布时间：2024-04-01 - 摘要：<正>根据中国机械工程学会"机学学〔2012〕012号"文件,第十二届全国铸造年会暨2011中国铸造活动周在活动集成、内容形式、参会人员层次范围、组织水平、活动效果等方面表现突出,被授予"2011年度最具影响力的综合活动平台",并颁发了奖牌,这是活动周这
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发布时间：2024-04-01 -
- 摘要：<正>由世界铸造组织（WFO）主办,墨西哥铸造学会承办的第70届世界铸造会议于2012年4月24-27日在墨西哥的新莱昂州州府蒙特雷市举行,来自20多个国家的200余名代表参加了本届世界铸造会议。4月25日,在蒙特雷市国际会展中心举办了本次会议的开幕式。在开幕式上,会议
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发布时间：2024-04-01 - 摘要：Development of industrial heat energy-saving materials or technologies such as light insulation refractory fiber,high temperature infrared radiant coating and regenerative high temperature air combustion technology were reviewed.Their application effects on domestic shell-baking furnace used in investment casting were described with the help of the examples.It was pointed out that the combination of blackbody lining material and the regenerative high temperature air combustion technology was an important development trend of energy-saving technology of investment casting shell-baking furnace.关键词：Mould shell;Baking;Energy-Saving
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发布时间：2024-04-01 - 摘要：A superalloy adjusting piece with 330 mm in length and 240 mm in width and 0.8 mm in wall thickness was produced by investment casting.The forming of the adjusting piece became very difficulty due to its complicated structure and many strengthened crossover ribs,resulting in the misrun,cold shut,shrinkage porosity and crack in the piece during investment casting and low qualified rate.Through optimizing gating system design,cold shut and misrun in the castings were eliminated effectively,greatly increasing the qualified rate,meanwhile,the production yield was increased by about 2 times.关键词：Investment Casting;Adjusting Piece;Gating System
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发布时间：2024-04-01 - 摘要：Insulation on the local shell is to make insulated layer outside the shell of the gate,castings,gate and castings,which can increase solidification time of the molten steel on the insulated layer and enlarge feeding channel for hot spot,so improving feeding ability of the gate and subjecting to the riser’ function.The process exhibits convenient and flexible,low cost,high feasibility.Meanwhile,it can increase the production yield and reduce the molten steel’s consumption.
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发布时间：2024-04-01 - 摘要：HT300 hydraulic castings was produced by lost foam casting.The experiment and practical application show that the hydraulic castings with smooth and clearly outline surfaces,accurate dimensions can be produced by selecting pattern materials with low carbon content,designing optimized gating system,using recently developed coating as well as increasing pouring temperature and vacuum degree moderately.关键词：HT300 Hydraulic Part;Lost Foam Casting;Gating System
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发布时间：2024-04-01 - 摘要：ZrVxFe（2-x） non-evaporable vacuum getter materials with different V contents,such as 0.2,0.3,0.4,0.5,were fabricated by the non-consumable vacuum arc melting process.The microstructure of the ZrVxFe（2-x） prepared was investigated by SEM（scanning electron microscope）,EDS（energy dispersive spectrometer） and XRD（X-ray diffraction） analysis.The results show that the alloy is composed of ZrFe2（V） and ZrV2（Fe）.In the solidification process,Zr phase is precipitate firstly,and then ZrFe2（V） and ZrV2（Fe） are nucleate and precipitate s.With the increase of V content in the alloys,the ZrFe2（V） phase is decreased,while the ZrV2（Fe） phase is increased.关键词：ZrVFe;ZrV2;Getter
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发布时间：2024-04-01 - 摘要：The high-strength copper/steel bimetal composite guide plates were produced by using two kinds of method such as liquid copper and steel casting cladding,liquid steel and copper casting cladding.The interface characteristics of the composite guide plate prepared was analyzed by observing the microstructures and measuring the elements distribution.The results show that desirable metallurgical bonding can be obtained at the copper/steel interface by the two methods.Atoms in high-strength copper/steel bimetal are preferential to diffusion along the metal surface and intergranular infiltration in composite process,and the main diffusion channel is grain boundary.The interfacial bonding of high-strength copper/steel bimetal can be achieved as a result of formation of Fe-Cu alloy phase in the Fe-rich and Cu-rich areas by surface wet-spread and atoms diffusion.关键词：Bimetal;Composite Guide Plate;Metallurgical Bonding
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发布时间：2024-04-01 - 摘要：The short carbon fiber reinforced copper matrix composites are a promising metal matrix composites.However,copper plating on the surface of the short carbon fiber was conducted owing to the bad wettability between copper and carbon fiber.The electroplating copper and electroless copper process of short carbon fiber were reviewed,and merits and disadvantages of its process were analyzed in order to present its future tendency.With formaldehyde as reducing agent,the purity of the plating copper reaches almost 100%.So copper matrix composites made by such process exhibits excellent conductivity.But formaldehyde is harmful for human body and resulting in environmental pollution.Electroless copper plating in which hypophosphite acts as reducing agent is avirulent and harmless,however,the carbon fiber requires sensitization and activation.In the future,the main aspects will be focused on the system of electroless copper plating with hypophosphite acts as reducing agent,especially on simplifying process and improving the purity of plating copper.关键词：Short Carbon Fiber;Copper Matrix Composite;Electroless Plating;Electroplating
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发布时间：2024-04-01 - 摘要：The secondary phase in the semi-continuous casting 3003 aluminum alloy treated by homogenization at different temperature was investigated by OM(optical microscope) and Kelvin bridges.The effects of homogenizing treatment on the corrosion resistance of 3003 aluminum alloy were investigated by means of linear polarization curve,AC impedance and circular anodic polarization curves methods with the help of electrochemical station,and the corrosion morphology was observed by SEM(scanning electron microscope).The results show that the secondary phase in the 3003 aluminum alloy exhibits a significant change after the homogenizing treatment at different temperatures.The quantity,distribution and morphology of the secondary phase have an important effect on the corrosion resistance of 3003 aluminum alloy.Corrosion resistance of the alloy is deteriorated with increasing in secondary phase,and it is improved with the improvement of secondary phase distribution.In addition,the corrosion resistance of the alloy with shperodized secondary phase is superior to that with coarse and sharp one.关键词：Homogenizing Treatment;3003 Aluminum Alloy;Secondary Phase;Corrosion Resistance
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发布时间：2024-04-01 - 摘要：Corrosion experiment of four self-developed free-cutting Zn-Al alloys with varied Bi was conducted in the 3.5%NaCl solution,and the comparative testing was performed both in the humid air and dry air.The corrosion behavior was investigated by means of X-ray diffraction(XRD),field emission scanning electron microscopy,energy spectrum analysis and electrochemistry testing.The results show that the main corrosion exhibits spot corrosion in the alloy.With increasing in the content of Bi,the average rate of corrosion is increased.The Al-rich phase in Zn-Al alloy is easier to be corroded,and the corrosion process belongs to electrochemical corrosion,in which η phase is acted as the anode and Al as cathode.关键词：Free-Cutting Zn-Al Alloy;Corrosion Rate;Electrochemical Corrosion
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发布时间：2024-04-01 - 摘要：<正>永乐大钟(见下页)[1]明永乐(公元1403-1424年)通高675cm,钟唇外径230cm,钟唇最厚处18.5cm总生46.5t高锡青铜北京大钟寺博物馆藏明太祖朱无璋四子日棣以"清君侧"名义发动
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发布时间：2024-04-01
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