最新刊期
卷 41 ， 期 3 ， 2021
- 摘要：<正>时间:2021年8月3-6日地点:南昌1.会议主办单位中国机械工程学会铸造分会《特种铸造及有色合金》杂志社（武汉）南昌航空大学2.会议承办单位《特种铸造及有色合金》杂志社（武汉）3.会议时间2021年8月3-6日4.会议地点南昌嘉莱特经典国际酒店5.征文内容（1）铸造有色合金（包括铝、镁、钛等轻有色合金,铜、锌等重有色合金,中间合金,高温合金及特种合金）、复合材料（包括铝、镁、钛、铜、锌、钢等基体）的研究与应用;
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发布时间：2023-12-18 - 摘要：The segregation of impurity elements is known as an important factor leading to abnormal failure of large-scale key structural parts.The segregation degree,segregation position and segregation type of impurity elements such as P,Ca,Zn,Pb,Cu,Fe,Zr and Mn were analyzed for A356.2 aluminum alloy wheel hub by reverse squeeze casting.The results reveal that the rheological behavior of squeeze casting has an important influence on the segregation of impurity elements.Three kinds of interesting segregation are presented as follows:the"channel segregation"along the rheological feeding channel,the "zero rheological segregation" in the non-deformation zone,and the "specific gravity segregation" of calcium and copper.The degree of segregation of these impurity elements can be divided into four grades according to the segregation ratio from low to high.Zinc,plumbum and phosphorus belong to serious segregation elements with the segregation ratio higher than 0.3,which reaches grade 4,while calcium belongs to the heavy segregation element with the segregation ratio of 0.2～0.3,which is grade 3.Meanwhile,the impurity elements such as iron,copper,manganese,zirconium are all light segregation elements with the segregation ratio of 0.1～0.2,which is grade 1 or grade 2.The segregation position of impurity elements is controlled by solidification sequence,rheological state and spatial position.The central position（zero rheological zone）under punch or indenter and local hot spot positions of reverse filling are the accumulation area of k0<1 impurity elements.On the contrary,the farthest position of reverse filling is poor in impurity elements.关键词：Aluminum Alloy;Wheel Hub;Squeeze Casting;Impurity Element;Segregation
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发布时间：2023-12-18 - 摘要：The Inconel 718 alloy was fabricated by selective laser melting with different scanning speeds and modes.The effects of process parameters on molten-pool morphology,solidification structure,grain growth and grain orientation were investigated.The results indicate that the depth-width ratio of the molten-pool is increased and the curvature is decreased with the increase of the scanning rate,while the ratio with the single-direction scanning is greater than that with the decussation scanning at 1 450 mm/s.In the molten pool,the solidified structure is converted from the cell crystal at the bottom to the cell dendrite on the side of the molten pool.The grains are grown along the preferred orientation of<001>direction,and the misorientation is dominated by small-angle misorientation（<15°）.The fraction of small-angle misorientation is increased with the scanning rate increase under the decussation scanning mode.When scanning rate is constant,the fraction of the small-angle misorientation is 62.57% under the decussation scanning mode,while that under single-direction scanning mode is 47.69%.关键词：Selective Laser Melting;Inconel 718 Alloy;Molten-pool;Microstructure
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发布时间：2023-12-18 - 摘要：MgZn6xYx（x=0.7,1.0,1.5,2.0,atomic in%）alloys were prepared by conventional solidification technique.The effects of Y content on microstructure and mechanical properties of MgZn6xYx alloys containing icosahedral quasicrystal phase（I-phase）as a secondary solidification phase were investigated.The results show that MgZn6xYx alloys consist ofα-Mg matrix and（α-Mg+I-phase）eutectic structure which is distributed around the grain boundaries.With the increase of Y addition,the matrix grain size is decreased,and the content and the size of eutectic structure are increased,meanwhile the morphology of which also is transformed from discontinuous distribution to continuous distribution.During the solidification process,I-phase is formed undergoing eutectic reaction.Mg89.5Zn9.0Y1.5 alloy exhibits the maximum ultimate tensile strength of 179.2 MPa and the maximum elongation of 3.5%,respectively.The fracture mode of MgZn6xYx alloys is characterized by quasi-cleavage fracture.关键词：MgZn6xYx Alloys;I-phase;Microstructures;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Nb-20Si-5Al-xTi（x=0,18,20,22,%）ultrahigh temperature alloys were prepared by the spark plasma sintering（SPS）technology.The effects of Ti addition on the fracture toughness and high temperature oxidation resistance of the alloys were analyzed.The results reveal that the phase composition of Nb-20Si-5Al ultrahigh temperature alloys is transformed from Nbss、（Nb,Ti）5Si3and Al3Nb to Nbss、（Nb,Ti）5Si3、Ti and Al3Ti phases.The fracture toughness and high temperature oxidation resistance of alloys can be obviously improved with the addition of Ti element,which are both increased firstly and then decreased with the increase of Ti content.When the content of Ti is 20%,the fracture toughness reaches the maximum value of 7.41MPa·m1/2,which is 56.9% higher than that of one without Ti,and the high temperature oxidation rate is the lowest,which is 0.72×10-4g2/（cm4·h）.After adding Ti,Ti2Nb10O29、TiNb2O7、TiO2 and so on can be observed in the oxidation products,which improve the compactness of the oxide film,thus enhancing the oxidation resistance at high temperature.关键词：SPS;Nb-Si Based Ultrahigh Temperature Alloy;High Temperature Oxidation Resistance;Fracture Toughness
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发布时间：2023-12-18 - 摘要：<正>Canalys最新研究数据显示,2020年中国市场共出售130万辆电动汽车,同比增长8%,占全球电动汽车销量的41%。Canalys预测,2021年中国将售出190万辆电动汽车,增幅高达51%,将占中国汽车总销量的9%。Canalys副总裁Sandy Fitzpatrick称,电动汽车在2020年中国乘用车总销量中仅占6.3%,未来将继续增长。
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发布时间：2023-12-18 - 摘要：<正>海关总署统计数据显示,2020年中国6种税号镁产品出口量共计39.38万t,同比减少12.78%。其中,2020年中国镁锭出口量20.35万t,同比减少15.35%;镁合金出口量10.72万t,同比减少4.96%;镁制品出口量为0.50万t,同比减少3.85%。分析指出,2020年受新冠肺炎疫情冲击,中国镁产品出口量下降明显,其中,镁锭出口量降幅较大,镁合金受影响程度相对较小。随着国内利好消息提振,及海外疫情形势有所缓解,我国镁出口明显好转,尤其12月份镁价高位回调,出口集中走货增多。
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发布时间：2023-12-18 - 摘要：<正>日前,甘河工业园区青海盐湖特立镁有限公司自主研发的"高扭矩输出镁合金变速器壳体"获得国家知识产权局授权的1项发明专利、4项实用新型专利和省科技厅颁发的"青海省科学技术成果证书"。据了解,2020年,在各级科技部门大力支持下,组织青海大学、湖南大学、常州海科新能源技术有限公司等单位实施了"新能源汽车国产飞轮混动系统轻量化降噪镁合金壳体的开发与应用示范"项目。经过一年来努力,成功研发出高扭矩输出镁合金变速器壳体。
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发布时间：2023-12-18 - 摘要：<正>2月18日,由中国航发集团组织的铝合金铸件清理自动化生产线评标工作完成,经专家组的认真评选和审核,万丰科技凭借优秀的综合实力、技术水平、行业经验以及良好的品牌口碑获得认可,成功中标。意味着万丰"智"造将配套服务于中国顶尖的航空发动机产品升级。此次,万丰科技提供的生产线项目主要用于航空零部件产品后处理多道工序的全自动化生产。项目针对客户要求和产品特点提供了创新性设计,生产布局实现空间利用的最优化,生产流程的自动化,做到所有设备高度集成,实现智能、安全、高效、节能、降噪等特点,同时通过3D视觉+柔性化生产线技术,实现多品种、批量生产,全流程无人化、柔性化、数字化。
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发布时间：2023-12-18 - 摘要：<正>库卡上海松江工厂一期产能为1万台机器人,二期工厂也已竣工,设计产能为1.5万台/年,该工厂合计产能为2.5万台/年。库卡另一工厂位于广东佛山,开工于2018年,计划至2024年产能为7.5万台。根据最新消息,佛山库卡工厂自2018年底开始投产后,产能提升迅速,至2020年底,产能已提升至4万多台/年,加上上海工厂,这两个工厂目前产能约为7万台。
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发布时间：2023-12-18 - 摘要：<正>语言作为人类发明出来的重要交流工具,借助语言来完成经济贸易、制度制定、政权统治,同时语言也能够保存人类文明的丰厚成果。语言作为民族的重要文明之一,同样也是思维和交流的工具。能够作为思维的载体以及物质的外壳表现出来,语言作为符号以意义作为内容,语音作为外壳,将音义互相结合起来利用语法的规律组织来传递想要表达的意义。语言也是一种社会现象,是人类传递信息的重要工具,只有人类才能够使用真正的语言,也只有人类才能够将无意义的语音组合起来变成有意义的内容,通过无穷的变化形式来展现出无穷的含义。
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发布时间：2023-12-18 - 摘要：<正>随着时代的发展,人们生活水平提升的同时,各种闲暇活动也越来越丰富,广播也成为了人们茶余饭后热爱的新闻事件获取渠道之一。在播音专业的主持中,除了播音员的主持水平备受关注外,其播音主持的效果和播音设备主持显控台等相关的辅助播音设备也有着很大的关联性影响,播音显控台的操作性不仅要给予播音主持人便利的播音条件,也要带给听众良好的效果。随着时代的转变,对于播音设备的多功能显控台的设计标准也越来越高,现阶段的简单结构已然无法满足播音市场的需求,因此播音设备的多功能显控台的低质铸造工艺设计就成为了提升播音设备效能的方式之一。
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发布时间：2023-12-18 - 摘要：<正>随着我国改革开放以来,人们对于体育运动的概念,从最初的懵懂,逐渐开始重视各个方面的提升与精进。除了日常的生活,也重视一些体育运动项目的锻炼,羽毛球运动作为一项力量与技巧完美结合的运动,一直都是奥运会的比赛项目之一,我国也十分重视这项运动,不断培养着高水平的羽毛球运动员。随着时间的推移,不仅仅是一些职业和业余的运动员热爱羽毛球的运动,普通人也会在业余时间展开羽毛球的运动锻炼,我国的羽毛球运动得到了十分广泛的发展与推行。随着羽毛球运动的广泛推行,很多人对于羽毛球球质轻、高强有了更高的需求。
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发布时间：2023-12-18 - 摘要：<正>时代在不断的发展,人们的生活节奏不断加快,图书馆传统的借阅模式无法紧跟时代发展的步伐,人们希望能够更加灵活地运用时间,在这样的背景下,图书馆进行了智能化的发展。自助服务的终端设备能够有效满足读者的多样化需求。在互联网信息时代的狂潮下,自助服务能够有效提升图书馆的使用率,吸引更多读者借阅,推动图书馆的持续性发展。基层图书馆是我国公共文化服务体系的主要组成部分,是建设普惠型、优质便捷型图书馆服务的核心。
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发布时间：2023-12-18 - 摘要：<正>伴随经济全球化的实现以及中国人民生活水平的不断提高,中国人民对身体健康的需求正逐步向西方发达国家不断靠拢。网球是国外非常流行的运动,近年来,网球运动因其轻松、健康等特点,在中国悄然兴起,越来越流行,喜爱以及参加的人数日益增加。公众对网球的关注以及认识极大地促进了我国网球产业的发展与进步。同时,人们对高品质网球用品的追求提倡对我国网球用品的制造以及加工提出更高的要求。
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发布时间：2023-12-18 - 摘要：<正>随着我国房地产事业的不断发展,我国的物业管理行业也随之兴起。物业行业属于劳动密集型的产业,从业人员的学历和整体素质都偏低,许多人员并没有接受过专业的正规教育。物业企业进行招工时对工作人员的学历也并没有相应的限制,只需要勤劳工作爱岗敬业即可。因此大部分的工作人员学历基本都在初中以下,一些技术人员的学历可以达到中专或职业技校的水平。物业管理人员的学历较高,能够达到大专以上的学历,但本科以上学历的管理人员很少。
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发布时间：2023-12-18 - 摘要：<正>进入新经济时代,全球经济化发展逐渐深入。我国与国际的接轨也逐渐拓宽,越来越多的企业与国外企业进行互相学习和交流,而高等化、国际化的教育也逐渐成为我国教育发展的重心,各大高校在注重学生理论知识学习的同时也开始注重学生的实践能力和适应能力,为国家、社会、企业输送更多应用型专业人才。专业英语中包含了特定专业知识以及行业规范等内容,铸造类专业英语主要针对的是铸造冶金等相关专业。目前我国的专业英语教学重点主要在于扩大学生专业相关的词汇量,充分掌握专业英语的句型结构和翻译技巧,加大学生对专业文献的翻译和查阅能力并且具有撰写专业相关论文的能力。
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发布时间：2023-12-18 - 摘要：<正>以信息技术为核心的科技革命以及产业变革正在不断深入,面对新工业与新经济结构的挑战,我国提出了中国制造2025的战略。我国的工科人才培养也面对着全新的挑战,2017年我国全面启动新工科战略,教育部发布相关文件对理工类专业的发展方向作出了规划并且指明了发展方向,从客观角度上推动理工类教学方法的改革。
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发布时间：2023-12-18 - 摘要：Complex brass has been widely used in the manufacture of wear-resistant components in the marine and automotive industries,especially synchronizer gear rings in the automotive field,due to its high mechanical strength and excellent wear resistance.The research status and microstructure characteristics of high-strength complex brass were reviewed,and the influence of the matrix structure,the types,morphology,distribution,and volume fraction of the second phase on the properties of the alloy were described in depth.Several methods to improving the mechanical properties of materials were listed,hoping to play apositive guiding role in the development and improvement of the complex brass.关键词：Complex Brass;Enhancement;Second Phase;Constitutive Relation between Microstructure and Properties
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发布时间：2023-12-18 - 摘要：With the rapid development of the copper industry,the annual discharge of copper slag in China has exceeded 20 million tons.Dumping or disposal of such huge quantities of copper slag cause environmental and space problems,which hinders the healthy and sustainable development of the copper industry to some extent.The effects of sources,types,properties and environmental impact of copper slag on the environment were described,and the progress of copper slag treatment was analyzed and summarized from the aspects of valuable elements recovery and resource utilization.Finally,the problems that need to be solved in the large-scale application of copper slag were prospected.关键词：Copper Slag;Recovery and Utilization;Processing Technologies
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发布时间：2023-12-18 - 摘要：The development history,research progress and development direction of high-performance copper alloy were systematically described based on the performance requirement.The influencing factors,regulating mechanism and interaction mechanism of copper alloy,such as strength,electrical conductivity,heat resistance and wear resistance were introduced.The fabrication methods and strengthening mechanism of copper alloy with superior comprehensive properties were summarized,providing ideas for the design and fabrication of new highperformance copper alloy.关键词：Superior Copper Alloy;Heat Resistance;Wear Resistance;Service Performance
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发布时间：2023-12-18 - 摘要：Powder compact melting（PCM）is one of the methods to produce aluminum alloy with closed pores.At present,micro aluminum foam with advanced pore morphology（APM）can be prepared by improving the method.The obtained products exhibit uniform porous structure with high porosity,and large-size aluminum foam and its composite structure can be prepared by utilizing the manufactured micro-aluminum foam.The preparation technology of advanced porous micro aluminum foam and its composite structure were reviewed,and its structural characteristics and mechanical properties were summarized.Meanwhile,the existing problems at the present stage were analyzed,and the development prospect was expounded.关键词：Advanced Pore Morphology （APM） Foam Aluminum;Powder Compact Melting （PCM）;Preparation Process;Structural Characteristics;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The application background of aluminum-based ceramic cores for turbine hollow blades was described,and the important significance of aluminum-based ceramic core strengthening and melting loss performance was expacnded.The research status of alumina-based ceramic core dissolution loss enhanced by molding materials,pore-forming agents and core removal methods were described.The challenges to the future development of aluminum-based ceramic cores were prospected.关键词：Hollow Blade;Aluminum-based Ceramic Core;Dissolution Loss Performance
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发布时间：2023-12-18 - 摘要：Molybdenum wire,as an important kind of molybdenum products,has a very broad prospects for development,which is mainly used for wire cutting,spraying molybdenum wire industry,et al.However there exist some problems in wire rate low,high rate of broken wires and short service life in the process of preparation and use,so pure molybdenum wire has been unable to meet the development of modern industry,and all kinds of doped molybdenum wire are gradully paid attention.The preparation methods and research status were reviewed of pure molybdenum wire,TZM wire,Al-Si-K doped molybdenum wire,Mo-Re wire,rare earth doped molybdenum wire,Mo-Al2O3 alloy wire and composite doped molybdenum wire,and the problems in the research process of molybdenum wire were discussed,summarized and prospected.关键词：Molybdenum Wire;Application;Research Status
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发布时间：2023-12-18 - 摘要：5%concentration neutral salt spray accelerated corrosion experiments were carried out on copper aluminum composite plate in intermittent energized state.The corrosion mechanism and current influence mechanism of composite plate were analyzed by weight loss analysis,SEM,EDS,XRD and electrochemical detection.The results indicate that the galvanic corrosion tendency at the interface of copper-aluminum composite plate presents more serious than that of aluminum matrix far away from the interface.In 0～50 A,the current can accelerate the corrosion,and the higher the current is,the more significant the acceleration is.The intermittently energized specimens are corroded more severely than the entirely energized ones under 25 Acurrent within 48 h.关键词：Corrosion;Copper-aluminum Composite Plate;AC Current;Intermittent Energized
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发布时间：2023-12-18 - 摘要：The research progress in composite tungsten carbide（WC）and high entropy alloy（HEA）in recent years was reviewed.WC-HEA cemented carbide based on WC and HEA/WC composite coating based on HEA were mainly introduced.The possibility of improving strength,hardness,wear resistance and corrosion resistance of high entropy alloy composite tungsten carbide materials was analyzed.The development prospect and research emphasis of high entropy alloy and WC phase composite were prospected.关键词：Cemented Carbide;High Entropy Alloy Binding Phase;High Entropy Alloy Coating;Tungsten Carbide Composites
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发布时间：2023-12-18 - 摘要：The effects of cooling rate on the solidification characteristics and microstructure of Al-3Fe alloy were investigated by cooling curve measurement,optical microscope（OM）and X-ray diffraction（XRD）.The results indicate that in the cooling rate of 0.69～11.8℃/s,the microstructure of Al-3Fe alloy is composed ofα-Al dendrites,primary Fe-rich phases,which mainly contains Al3Fe,Al6Fe and Al5Fe2 phases,and interdendrite eutectic structures.the cooling rates have an obvious effect on the solidification characteristics and microstructure of Al-3Fe alloy.With the increase of cooling rates,the nucleation temperature of primary phases and eutectic reaction temperature are decreased,with the solidification structures refined significantly.关键词：Al-3Fe Alloy;Cooling Rate;Solidification Characteristics;Microstructure
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发布时间：2023-12-18 - 摘要：The element composition of 20 kinds of hard aluminum wires for overhead transmission lines was analyzed,and the relationship between the content of each impurity element and the conductivity was investigated.The results reveal that the total amount of impurity elements is not completely negative linear to conductivity,while the trace impurity elements Ti,V,Mn and Cr have significant effects on the conductivity.Proper amount of boron can effectively improve the conductivity,while rare earth elements can be ignored for effect on wires.Under the condition that the total amount of impurity elements is less than 0.20%,only when w（Ti+V+Mn+Cr）is less than 0.001%,w（Fe）is less than 0.10%,and w（Si）is less than 0.05%,the conductivity of hard aluminum wire can be higher than 36.25 MS/m,and that of the related annealed aluminum wire can be guaranteed to reach above 37.12 MS/m.关键词：Electrical Aluminum;High Conductivity;Hard Aluminum Wire;Annealed Aluminum Wire
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发布时间：2023-12-18 - 摘要：7 A85 aluminum alloy ingots were prepared by semi-continuous casting process,and extruded strip plate with section size of 50 mm×300 mm was prepared by extrusion process,followed with solution treatment,10%cold compression treatment and artificial aging treatment at 120 ℃.The effects of 10% cold deformation on the aging microstructure of 7A85 aluminum alloy were investigated by means of TEM and room temperature testing.The results indicate that after solution treatment,a large number of dislocations are induced by 10% cold deformation treatment,thus improving the strength of the alloy.At the initial stage of aging,the amounts of precipitates in the 7A85 alloy with 10% cold deformation treatment is significantly higher than that of ones without cold deformation treatment,which plays a certain role in pre-aging.At the end of aging,the amounts of precipitates and dislocations in 7A85 aluminum alloy treated by 10% cold deformation are higher than that of ones without cold deformation treatment,leading to the enhancement of tensile strength and yield strength as well as reduction of the elongation.关键词：10% Cold Deformation;7A85 Aluminum Alloy;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The structure transformation of DD9 nickel-based single crystal superalloy and formation mechanism of the incipient melting structures during homogenization were investigated.The results indicate that there are two types of incipient melting structures:irregular one caused by meltedγ/γ′eutectic and regular one caused by melted homogenization pore.Due to the generation of incipient melting structures,which reduces the high-temperature performances of castings,the rupture life of specimen at 1 100 ℃ and 137 MPa is decreased by 35 h.Both structures can be avoided by increasing holding time at lower temperature and promoting the diffusion of elements.关键词：Superalloy;Solid Solution;Single Crystal;Incipient Melting Structure
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发布时间：2023-12-18 - 摘要：The influence of electric pulse（EP）current with frequency of 20,50 and 150 Hz as well as the current density of 400 Aon the microstructure and mechanical properties of Al-Zn-Mg-Cu rolled plate was investigated during solidification process.The results indicate that the macro-segregation degree is greatly improved and the microstructure is obviously refined with 20 Hz EP field.Instead,the structure entirely made up of dendrites has hardly any change at 150 Hz.τphases in form of network or island are widely distributed in aluminum alloy.Meanwhile,the tensile strength of cast rolling strips modified by 20 Hz EP current can reach 320 MPa,which is1.3 times of that of conventional ones.The strips are characterized by brittle fracture,and the ductility is increased after modified by EP current.关键词：Al-Zn-Mg-Cu Alloy;Roll Casting;Electric Pulse Current;Microstructure and Performance
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发布时间：2023-12-18 - 摘要：The multiple trace rare earth elements RE（0.2%Y+0.1%Nd+0.05%Gd）（mass percentage）were added to prepare light and high-strength Mg-9Li-1Zn-RE alloy（LZ91-RE）,which was subsequently forged and cold rolled.The microstructure and phase of the as-forged and as-rolled LZ91 alloy and LZ91-RE alloy were analyzed by means of OM,SEM,EDS,XRD,TEM.Meanwhile,the mechanical properties of the alloy prepared were tested by the tensile testing machine.The results reveal that the microstructure of LZ91 alloy consists of two phases ofα-Mg andβ-Li.After the addition of multiple rare earth elements,the volume fraction ofαphase in LZ91 alloy is reduced by 26.5%,and the grains are significantly refined.Y-rich,Nd-rich,Mg12Nd and Mg3RE rare earth strengthening phases are in-situ precipitated,however there exists a local segregation.After deformation of the LZ91-RE alloy by cold rolling with large strain,the rare earth strengthening phases in the alloy are broken and refined with more uniform distribution.In addition,compared with that of the LZ91 alloy,the tensile strength of the as-forged LZ91-RE alloy is increased by 13.9%.The tensile strength of the cold-rolled LZ91-RE alloy is increased by 19%,while the elongation is only reduced by 4.44%.关键词：Mg-9Li-1Zn Alloy;Rare Earth;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The effects of hot isostatic pressure（HIP）（80～120 MPa）and duration（1～3 h）on defects and properties of AlSi7 Cu2 Mg alloy castings with different wall thickness were investigated by multi-step sand casting.The results reveal that with the increase of HIP pressure and holding time,the holes are reduced,the density and the tensile strength of castings with different wall thickness are enhanced.The thicker the wall thickness is,the more obvious the enhancement of density and tensile strength is.When the holding time is more than 2 hunder the fixed HIP temperature（490℃）and pressure（100 MPa）,the density is slightly increased,while the tensile strength has no obvious improvement when the HIP pressure exceeds a critical value（～100 MPa）under the fixed HIP temperature（490℃）and time（2 h）.关键词：AlSi7Cu2Mg Alloy;Hot Isostatic Pressing;Density;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The influence of aging temperature and Cr content on the hardness,conductivity and corrosion resistance of 70% cold-rolled Cu-Ag-xCr alloy was investigated.The results indicate that with the Cu-Ag-xCr alloy aged at 450～500 ℃,the hardness of the alloy is decreased with the increase of the aging temperature,and increased with the increase of the Cr content.The effect of aging temperature and Cr content on the conductivity can be neglected.With the increase of the ageing temperature,the corrosion resistance is decreased,and with the increase of the Cr content,the corrosion rate is decreased and the corrosion resistance is increased.When the Cr content is 0.34%,the comprehensive performance is optimal at 450 ℃ aging for 2 h,where the conductivity is47.02 MS/m,the hardness is 128.34 HV0.1,and the corrosion resistance is better.关键词：Cu-Ag-Cr Alloy;Cr Content;Aging Temperature;Hardness;Corrosion Resistance
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发布时间：2023-12-18 - 摘要：The AlSiMgMnCr alloy with different Cr contents was perpared by high vacuum die casting.The microstructure and precipitated phase of the alloy were investigated by SEM and TEM.The area fraction and equivalent diameter of iron phase in the alloy with different Cr content were calculated.The results reveal that with the increase of Cr content,the yield strength of the T6 state alloy is increased and the tensile strength keeps stable,while the elongation is decreased significantly.With the increase of Cr element,the area fraction and equivalent diameter of iron phase in aluminum matrix are increased.Cr element was added into the alloy to form the precipitated phase containing Cr,which inhibited the growth ofβ″phase in the aging stage,and the uniformity ofβ″phase in aluminum matrix was decreased.关键词：High Vacuum Die Casting;Mechanical Properties;Microstructure;AlSi7MgMn Alloy
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发布时间：2023-12-18 - 摘要：The WE43 magnesium alloy was prepared by low-pressure die casting.The microstructure of WE43 magnesium alloy before and after heat treatment was observed by optical microscope,scanning electron microscope and energy dispersive spectroscopy.The effects of heat treatment process on mechanical properties of WE43 alloy were also analyzed.The results show that the as-cast microstructure of the alloy is composed of primaryα-Mg and eutectic phase with Mg24Y5.With the heat treatment of 520℃×10 h+225℃×14 h,the microstructure of the alloy is composed of primaryα-Mg,cluster of square phase,residual eutectic phase with Mg24Y5 and aging precipitation phase.By heat treatment,the tensile strength and yield strength of the alloy are increased to305.9 MPa and 191.8 MPa,respectively,and the elongation is decreased to 3.1%.关键词：WE43 Magnesium Alloy;Heat Treatment;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：<正>近日,俄罗斯国立研究技术大学的科研人员首先发现了钛镍合金的热机械处理最佳参数,从而改进了生产医学形状记忆合金的技术。新方法可提升现有手术设备的可靠性,并开发出许多新产品。形状记忆合金是受到严重变形后能够恢复形状的材料。目前,使用最广泛的是基于钛镍合金的形状记忆合金,其被用于具有高可靠性要求的医学植入物和智能医疗设备中,例如可移动式手术支架或血管支架。
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发布时间：2023-12-18 - 摘要：ProCAST software was adopted to simulate the casting solidification process of the vulnerable caterpillar board.The effect of pouring temperature on casting defects and pouring rate and pouring temperature on the valid stress of the casting were analyzed,and the experimental verification was carried out.The results demonstrate that the shrinkage cavity and porosity defects in the caterpillar board are obviously reduced when the pouring temperature is 1 610℃.The valid stress of the casting is hardly affected by the pouring rate,which can be significantly reduced by appropriately reducing the pouring temperature,thus resulting in good quality of castings.关键词：Lost Foam Casting;ProCAST Software;Solidification Process;Caterpillar Board
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发布时间：2023-12-18 - 摘要：Aiming at the common problems that the production process is difficult to control,the product quality is difficult to quantify,and the product information is difficult to trace during the production process of casting enterprises,a casting product life-cycle management system was designed.In the system,the database indexed by module number unique code was established,which was bound with the data of production to realize the automatic collection of production data based on the data acquisition interface designed by InteliiJ IEDA development platform.The casting monitoring system was built up by configuration and PLC technology,and the real-time monitoring of the whole pouring process was realized through the visual monitoring platform.At present,with the help of the system which was verified in EPC enterprises,the production process with potential quality hazards was optimized and improved,increasing the efficiency of design and production and strengthening the quality management.关键词：Foundry Products;Life-cycle Management;Production Data Traceability;Mold Number Unique Code
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发布时间：2023-12-18 - 摘要：In order to control the temperature field of the aluminum alloy casting during heat treatment process and reduce deformation,the numerical simulation was adopted to investigate the effect of rack with different structure on the temperature field and uniformity of castings.The results indicate that the simulated temperature field is in great agreement with the experimental ones and the rack structure has significant effect on the temperature field.Regarding to cabin castings of aluminum alloy,the temperature uniformity on the surface of the casting is desirable within the range of ±5 ℃,when the rack with big hole of 600 mm in diameter and small holes of 30 mm in diameter are used.关键词：Heat Treatment;Temperature Field;Flow Field;Numerical Simulation
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发布时间：2023-12-18 - 摘要：In order to solve the problems of high labor intensity,low production efficiency and potential safety hazards in high-temperature operations during the low-pressure casting water-cooled shell,it is planned to use robots to complete the core-removing and the part-removing.Therefore,it is necessary to redesign the low-pressure casting process of water-cooled shell and optimize the time sequence.According to the new production process,fast changing platform for tools and other auxiliary devices were designed,and the components of the system was re-arranged.As the control core,PLC can realize the precise linkage control of all components of the system and the fast accurately switching between the core-removing action and the part-removing action,and improve the automation of low-pressure casting of the water-cooled shell.关键词：Water-cooled Shell;Low Pressure Casting;Robot;Fast Changing Platform for Tools;PLC
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发布时间：2023-12-18 - 摘要：For the automobile engine front cover parts,there are many oil channels and independent of each other for the product,which should not be leakage resulted from shrinkage hole between each oil channel.For the die casting mold design,local extrusion was realized by core-pulling and extrusion,aiming at the parts with high requirement of compactness inside each oil passage,and the extrusion alarm and core insert spraying were designed to complete the local extrusion action with the die opening and closing to realize the function of local extrusion linkage core insert spraying,improving the inner shrinkage cavity of the casting,strengthening the compactness,and meeting the test seal requirements of the front cover products.关键词：Shrinkage Hole;Local Extrusion;Compactness;Core Pulling and Extrusion;Insert Core Spraying
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发布时间：2023-12-18 - 摘要：Aiming at the high porosity open cell aluminum foam（sponge aluminum）prepared by investment casting method,the relative density of sponge aluminum is increased by increasing the thickness of the struct in the precursor,and the effects of struct size on the compression performance were investigated.The results reveal that the struct of polyurethane sponge can be thickened effectively by using waterborne polyurethane resin（WPU）,and the foam aluminum with pore edge thickness of 0.472～0.918 mm and relative density of 0.027～0.164 were prepared.The results of uniaxial compression test indicate that the strength of sponge aluminum is greatly enhanced by increasing the struct.When the thickness of struct is 0.918 mm,the densification platform and energy absorption reach the maximum,which are 2.831 MPa and 1.492 MJ/m3,respectively.The reason is that the relative density is increased with the increase of struct thickness,improving the energy absorption capacity of sponge aluminum.关键词：Sponge Aluminum;Compressive Behavior;Investment Casting
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发布时间：2023-12-18 - 摘要：The key procedures for centrifugal casting DN80 ductile iron pipe were expounded,such as melting,spheroidization,pouring and annealing.The DN80 ductile iron pipe was smelted with 5 tcoreless main frequency furnce.Si-Fe alloy was added to prevent nodulized fading with 25 kg/t before pouring.The water-cooled centrifugal machine was carried out by 60 s/unit during pouring process.Meanwhile,the temperature of liquid Fe of nodulized laddle was controlled at 1 450～1 470℃,and fanladdle temperature was contraled at 1 380～1 400℃.Contiauous high temperature annealling furnace was adopted to anneal treatment at 980℃.In addition,common defects in the DN80 ductile iron pipe was analyzed and countermeasures were presented.关键词：Centrifugal Ductile Iron Pipe;DN80;Centrifugal Casting Process;Defect Prevention
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发布时间：2023-12-18 - 摘要：<正>2021年"第27届中国铸造协会消失模V法实型分会"年会,根据疫情形势预期于2021年7月～8月举办。为做好消失模V法实型铸造分会年会交流内容的组织工作,营造良好学术氛围,推动消失模铸造行业创新、协调、绿色、开放、共享发展,促进行业单位之间交流与合作,展示自身在技术研发、管理创新、生产实践方面等取得成果,现公开广泛征集年会论文。
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发布时间：2023-12-18
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