最新刊期
卷 41 ， 期 11 ， 2021
- 摘要：<正>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.会议协办单位广州和德轻量化成型技术有限公司南昌大学中铸产业网4.会议支持单位fsc跨国铸造采购平台帕盛博（苏州）软件科技有限公司广州树森耐火制品有限公司5.会议时间2021年12月3-6日（因疫情影响,会议日期由8月3-6日延期到12月3-6日）6.会议地点南昌嘉莱特精典国际酒店（江西省南昌市八一大道2号）7.会议议程（1） 12月3号全天报到（2）开幕式及代表合影（4日上午8:00-9:00）（3）大会学术报告（4日全天,5日上午）（4）专题技术报告、青年编委交流会（5日下午）（5）参观南昌航空大学航空制造学院江铃汽车集团有限公司洪都航空工业集团有限公司
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发布时间：2023-12-18 - 摘要：In recent years, with the complexity of the gas-cooled structure and the large-scale size of the single-crystal turbine blade, the production of single-crystal blade is more prone to crystal selection failure, orientation deviation, sliver, large angle grain boundary, stray grain in the platform, recrystallization, freckles and other defects, which lead to the reduction of high-temperature alloy performance of single crystal turbine blade, and eventually cause the scrapping of single-crystal blade. In order to reduce these defects in single crystal blade, improve the quality of single crystal, and obtain a complete structure of single crystal structure, it is very important to be familiar with various common defects in the production of single crystal blade, realize the formation rules of defects, and master the defect inhibition technology. On this basis, the common solidification defects in the production of single crystal blades, as well as the formation rules and inhibition methods of solidification defects were systematically introduced, which lays a solid theoretical foundation for reducing the defects of single crystal blades and improving the quality and qualification rate of blades, and provides a strong technical support.关键词：Single Crystal Superalloy;Directional Solidification;Solidification Defect;Formation Law;Inhibition Method
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发布时间：2023-12-18 - 摘要：The course of competitive growth mechanism of nickel based single crystal superalloy during directional solidification in recent decades were systematically reviewed. Furthermore, the progress in this field was introduced. Finally, the future outlooks were prospected.关键词：Nickel-base Superalloy;Temperature Field;Solution Field;Synergistic Effect;Unusual Overgrowth
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发布时间：2023-12-18 - 摘要：The calculation models of macroscopic temperature field and microstructure phase field of Ni-based single crystal superalloy during directional solidification were established. The temperature fileld change of single crystal rod during directional solidification was simulated. Based on the macroscopic temperature field, the growth of microstructure was simulated. The microstructure of nickel-base single crystal superalloy was compared with the simulation results to verify the accuracy of the calculation model. Both the simulation and experimental results indicate that the dendrite morphology in different regions of single crystal rod after directional solidification has significant difference. The dendrite under high cooling rate presents small primary dendrite arm spacing, while that under low cooling rate is quite coarse, with well-developed primary and secondary dendrite arm as well as large primary dendrite arm spacing.关键词：Superalloy;Directional Solidification;Numerical Simulation;Phase Field
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发布时间：2023-12-18 - 摘要：The research progress in ceramic cores for fabricating hollow blades of turbine engines additive manufactured by photocurable 3 D printing at home and abroad was reviewed. The performance requirements and preparation difficulties of ceramic hollow blade cores were analyzed. Aiming at the problems including shrinkage, deformation and cracking in the process of photocurable 3 D printing additive manufacture for ceramic core preparation, the research status of slurry preparation, curing mechanism, degreasing, sintering process control and other aspects were reviewed, and the solutions were discussed. On this basis, the development of photocurable additive manufactured ceramic core was prospected combined with development trend of hollow blade of turbine engine. Photocurable 3 D printing ceramic core fabricated by hollow blade of turbine engine is considered as an important direction of future development.关键词：Photocurable 3D Printing;Hollow Blade;Ceramic Core;Additive Manufacture;Turbine Engine
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发布时间：2023-12-18 - 摘要：The freckle formation in specially shaped castings of a single crystal superalloy was investigated under industrial production condition. The results indicate that freckle defects are asymmetrically distributed due to the asymmetrical solidification condition in the ring-likely arranged castings. On the whole, all freckles appear on the inner side of castings with poor heat transfer conditions, while the outside is free of freckle, where the temperature gradient and cooling rate are significantly lower. Locally, all freckles are preferably generated on the convex corners or cambered surface rather than concave, and the reason is that coanda effect of liquid flow in pasty zone are overlapped on the convex site, promoting the formation of freckles. Moreover, the freckles are also observed on the surface, indicating that freckles can lead to an internal defect of single crystal superalloy castings.关键词：Freckle;Superalloy;Directional Solidification;Single Crystal
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发布时间：2023-12-18 - 摘要：A nickel-based superalloy was fabricated by laser additive manufacture and conventional casting method respectively. The microstructure of both alloys after heat treatment was observed by SEM. The tensile properties of specimens were tested from room temperature to 1 000 ℃, and the fracture characteristics were observed. The results indicate that the microstructure of the specimens fabricated by laser additive manufacture is heterogeneous, where the γ′ precipitations at dendrite arms are regular, however, the precipitations in the interdendrite regions are coarse and irregular. The tensile strength and elongation are slightly lower than those of the alloy fabricated by conventional casting method. At room temperature, the fracture mechanisms of both specimens are dominated by cleavage fracture. In the case of medium temperatures, both are dominated by shear fracture, while those at high temperature are dominated by micropore aggregation fracture. Therefore, the heat treatment process should be optimized to improve the microstructure uniformity, strength and plasticity.关键词：Nickel-based Superalloy;Laser Additive Manufacture;Directional Solidification;Tensile Properties
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发布时间：2023-12-18 - 摘要：Due to the excellent high-temperature mechanical properties and corrosion resistance, superalloys are widely used in critical components such as blades of aero-engines and gas turbines. In the long-term service process under high temperature, high pressure and corrosive environment, damages such as cracks and abrasion are easy to appear, leading to the failure of components. Laser additive manufacturing provides a new feasible way for the repair and reuse of damaged components such as superalloy blades. The application status of laser repair technology in superalloy blades and other components was reviewed, focusing on main problems and research status in aspects of stray grain and cracks. The new methods of laser repairing superalloys were summarized, and the future development trend was prospected.关键词：Laser Repair Technology;Superalloy Blades and Equipment for Components;Stray Grain;Cracks
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发布时间：2023-12-18 - 摘要：The mathematical model of the directional solidification process of single crystal superalloy blade was established based on the finite element method. The temperature field, temperature gradient and cooling rate were simulated at different with drawal rates. The results indicate that when the with drawal rate is 7.2 mm/min, the mushy zone of the blade is wider, and the isotherm inclination is greater than that of 3.6 mm/min and 4.5 mm/min. With the withdrawal rate increasing, the temperature gradient GL of the solid-liquid interface is decreased, and the temperature gradient on the inside of the spiral is larger than that on the outside. The withdrawal rate has little effect on the cooling rate in the starter block of grain selector and blade, while the cooling rate in the back block is increased with the withdrawal rate increase. Meanwhile, the nucleation and growth were simulated by coupling the temperature field and CAFé module to investigate the effect of withdrawal rate on the stray grains formation. The results reveal that stray grains are generated at the edge of the platform when the withdrawal rate is 7.2 mm/min, and the complete single crystal are generated when withdrawal rate is 3.6 mm/min or 4.8 mm/min.关键词：Single Crystal Blade;Directional Solidification;Withdrawal Rate;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Taking the gas turbine guide blade as the research object, the hot crack of blade produced by the investment casting process was analyzed, and the macro and micro morphology was investigated. DSC and THERMO-CALC were used to analyze the characteristics of the solidification interval of Mar-M247 alloy. Meanwhile, the temperature field and stress field of the blade solidification process were calculated combined with the numerical simulation software ProCAST, and the physical field characteristics and formation mechanism of thermal crack were described. The results indicate that the characteristics of the alloy solidification interval is the prerequisites for the formation of hot cracks, and the constraint conditions and tensile stress around the dendrite boundaries are the essential conditions. Thereinto, the R corner of the blade is the most sensitive area of thermal crack with slower solidification rate and larger temperature gradient, and the basin position with the faster solidification rate and the larger tensile stress is the thermal crack insensitive area.关键词：Gas Turbine Blade;Hot Crack;Formation Mechanism
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发布时间：2023-12-18 - 摘要：Aiming at the high difficulty and long cycles for wax pattern of complex casting, the DLP（digital light processing） 3 D printing technology was combined with traditional investment casting to produce the closed impeller with complex internal structure. The casting mold of impeller and the wax pattern of gating system were printed by DLP technology at one time, with a lower cost than that of the traditional process. The impeller casting products were obtained by making mold shell, dewaxing, baking and pouring. The results indicate that the surface quality of impeller casting products made by DLP technology meets the requirements without casting defects.关键词：Closed Impeller;Investment Casting;DLP 3D Printing Technology
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发布时间：2023-12-18 - 摘要：The research status of typical Dy-containing cast magnesium alloys was reviewed. The influence of Dy on the grain size, microstructure and mechanical properties of existing cast magnesium alloys was expounded. Meanwhile, the latest research progress in the mechanical properties and microstructure of Mg-Dy-RE and Mg-RE-Dy based cast magnesium alloys was presented, and the prospect of the research on the cast magnesium alloys containing Dy was also discussed.关键词：Casting Magnesium Alloy;Rare Earth Element;Mechanical Properties;Microstructure
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发布时间：2023-12-18 - 摘要：Wire and arc additive manufacturing（WAAM） is a technology for the rapid forming of large-scale metal components with complex structures, which has the advantages of low equipment cost, high material utilization and high deposition efficiency. On this basis, the current research status of WAAM equipment, materials and processes was highlighted combined with the hot topics of forming accuracy, microstructure characteristics and mechanical properties of metallic components. Finally, the key technologies that need to be solved for WAAM were summarized and the development direction of WAAM was prospected.关键词：WAAM;Forming Accuracy;Material of Wire;Forming Quality
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发布时间：2023-12-18 - 摘要：To accurately calculate the mould temperature field during the spray process of die casting process, the interfacial heat transfer coefficient（IHTC） between the mould and the spray medium is an extremely important thermo-physical parameter. A spray experiment was conducted with different spray pressures, in which the temperature history throughout the spray cooling process of H13 steel plate was recorded. The IHTC at the different spray pressures was calculated by utilizing the nonlinear estimation method. The interface morphology and heat transfer characteristics within the spray cooling process were investiagted, and the influence of spray pressures on the IHTC was expounded. The results show that the interface can be divided into wet and dry zone, where the former significantly affects the heat transfer behavior on the interface. It is found that high spray pressure has a positive effect on improving peak IHTC, whereas it impedes the expansion of wet zone and delays the peak of IHTC.关键词：H13 Steel;Spray Cooling;Interfacial Heat Transfer Coefficient;Inverse Method;Spray Pressure
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发布时间：2023-12-18 - 摘要：Based on numerical simulation methods, a two-dimensional electromagnetic field finite element model of aluminum alloy melt was established, and the effects of current mutation and different electromagnetic frequency on the magnetic induction intensity, electromagnetic force and primary phase of semi-solid aluminum alloy melt were investigated. The results reveal that under the same current mutation, the electromagnetic force and magnetic induction intensity are firstly increased and then decreased with the increase of the electromagnetic stirring frequency, reaching the maximum value at 25 Hz. Under the same electromagnetic frequency, the electromagnetic force and magnetic induction intensity are increased with the increase of the amplitude of current mutation, and the maximum value appears when current mutates from 2 A to 6 A. In the case of the optimal stirring frequency（25 Hz） and the mutation current（2～6 A）, the shape factor and average equal-area circle diameter of the primary phase are 0.71 and 118 μm, respectively.关键词：Electromagnetic Stirring;Numerical Simulation;A356 Aluminum Alloy;Semi-solid Microstructure
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发布时间：2023-12-18 - 摘要：<正>近日,国际铝业协会（IAI）在苏格兰格拉斯通第26届联合国气候变化大会召开前发布了一系列新的全球铝工业脱碳进程数据清单报告,并提出了2050年全球铝工业温室气体减排的阶段性目标及其细化分解目标。报告指出,到2050年,全球铝工业二氧化碳排放总量与2018年相比需要减少77%,其中,氧化铝和电解铝生产所产生的二氧化碳将显著减少。报告预测,铝冶炼应减少近90%的碳排放量,具体数值是从8.23亿吨降至9 000万吨。2018年,在铝冶炼环节中与电力相关的排放量为6.7亿吨,根据减排路径,到2050年这一数据需要降至800万吨。在氧化铝方面,报告预测,该行业的温室气体排放量应从2018年的1.71亿吨下降到2050年的9 000万吨,减少近一半。
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发布时间：2023-12-18 - 摘要：<正>近日,诺贝丽斯与江苏省镇江市签署协议,投资3.75亿美元用于其镇江工厂铝压延及回收产能的扩建,并将在华建立首个汽车用铝闭路循环回收系统,赋能交通运输可持续发展。诺贝丽斯是世界上最大的汽车铝板供应商,此次协议的正式签署标志着诺贝丽斯镇江工厂具备了以轻量化、可持续的铝材产品更好服务亚洲汽车市场的能力。协议内容包括将投资3.75亿美元扩建热轧生产线、新增冷轧机,并在中国建立首个汽车用铝闭路循环回收系统。
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发布时间：2023-12-18 - 摘要：<正>Novelis宣布,推出第二代轻型电动汽车电池外壳解决方案。据悉,第二代方案在第一代概念的基础上引入创新材料,与钢或铝型材制成的传统EV电池外壳相比,铝板强化设计能够大限度地减轻质量、降低成本并提供更高的电池能量密度。自2019年推出第一代电池外壳解决方案以来,Novelis一直与行业合作伙伴和汽车工程师合作,在优化设计的同时引入生产可行的创新,包括高强度铝滚压成型的电池到封装（CTP）模块化结构和结构集成的热管理底板。
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发布时间：2023-12-18 - 摘要：<正>旭升股份发布公告称,中国证监会发审委对公司公开发行可转债申请进行了审核。根据审核结果,公司此次公开发行可转债的申请获得审核通过。此次可转债拟公开发行总额不超过13.5亿元,期限6年,募集资金扣除发行费用后拟用于"高性能铝合金汽车零部件项目"和"汽车轻量化铝型材精密加工项目"。此次募投项目产品大多为传动系统壳体（如变速箱壳体、电机壳体）、电池系统部件（如电池盒、电池包导轨等）、车身结构件（如车门、车架等）。
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发布时间：2023-12-18 - 摘要：<正>近年,随着经济水平与科学技术水平的不断提高与优化,我国的工业生产质量与能力已经步入全球先进行列,且在部分领域内已经达到了世界领先水平,这一方面体现了我国的超高速进步水平,另一方面也对未来各行各业的发展提出了全新的要求。在我国现阶段的工业社会发展中,铸造行业及铸造相关产业作为一股中坚力量,其创造了巨大的物质财富与技术财富,这也使得社会各界对铸造领域的发展予以广泛重视。同时,大学生创业作为当今时代最为热门的话题,其不但受到高校学生的大力关注,也得到了企事业部门的充分注重。因此,为不断推动铸造产业及铸造相关企业的蓬勃发展,将大学生创业教育与铸造企业实际相结合,并充分运用企业带动教育的协同机制在当下工业社会发展中十分重要。
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发布时间：2023-12-18 - 摘要：<正>随着我国的经济快速发展,人们的生活水平随之提高,进入全球经济化发展,各个国家的往来加剧,文化逐渐汇聚,让人们对公共区域的景观设计提出了更高的要求。公共区域景观设计应当符合大众的审美标准,同时也能够展现出时代的发展。将文化融入景观设计当中能够极大程度丰富人们的生活,也能够提升城市的底蕴。近十年我国的交通运输行业得到了快速的发展,机场作为城市重要的运输途径同样也是城市的形象展示。机场在造型的设计方面充分将城市特征与飞行文化相结合,在公共绿色空间区域的雕塑铸造景观设计方面进行了创新和改进。
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发布时间：2023-12-18 - 摘要：<正>随着科技水平的蓬勃发展、经济实力的不断提高与综合国力的不断提升,我国各领域及各产业水平已经位于世界领军水平,这一方面体现了我国近年来改革开放与政策改革的先进性,另一方面也为未来发展提出了"新要求、新目标"。在上述时代发展背景下,工业的发展与社会整体的进步速度息息相关,而铸造领域及铸造相关企业作为工业社会中的重要力量,其为我国各行业进步做出了巨大贡献。因此,延续主要产业现下发展势头、不断提高铸造技术创新与铸造水平提升是保证我国工业社会国际竞争力的重要因素,而铸造专业人才的培养便是满足上述需求的重要因素。
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发布时间：2023-12-18 - 摘要：<正>随着我国教育系统的逐步发展与素质教育进程的持续推进,尤其是"双减"政策的全面要求与深入倡导下,国家、政府及社会在校中小学生乃至专本科院校学生在体育锻炼和体能训练上投入了更多的关注与重视。校园健美操最早起源于西方国家,经上世纪八十年代中期引入我国,历经四十年的发展与创新融合,已成为风靡高中、大学的常见校园体育运动形式,以其富有韵律的舞蹈以及青春跳跃的节奏深受师生喜爱,参与该项体育学习与专门培训的学生越来越多,进行集体展示与表演的机会也比其他体育形式更加广泛。
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发布时间：2023-12-18 - 摘要：<正>铸造业是我国重要经济支撑产业。伴随国内科学技术的飞速发展,作为信息传播重要手段的互联网,对当今铸造专业学生的学习、生活以及思想产生了微妙而深刻的影响。对于铸造专业来说,互联网时代为学生、教师知识以及信息的获取提供了新的方式,而且将继续为他们提供思想上的价值理念以及教育。现在,互联网时代成为了国内许多铸造专业学生进行党建工作的重要途径。所以,加快党建工作的发展,使铸造专业学生的党建工作能够更好应对当前互联网时代带来的挑战,并采取有效的对策,可以很好地提升铸造专业学生的党建效率以及质量。
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发布时间：2023-12-18 - 摘要：<正>近年来,随着我国经济水平的逐步攀升与城市化建设的逐步完善,人民的生活水平与生活质量大大改善,这一方面体现在人们的衣、食、住、行等基本物质生活中,另一方面体现在人们对精神生活与美学艺术的逐步追求。雕塑作为公共艺术产品中极具代表风格的一类产品,其常被应用于环境装饰、环境美化、事件纪念等领域,在雕塑产品中,其按照产品规模可分为微型雕塑、小型雕塑、中型雕塑和大型雕塑,而按照产品材质区分可分为可塑材料雕塑或可雕硬质材料雕塑。其中,以硬质材料,如金属、自然金属矿石等硬质材料为原料的中型雕塑是目前市场上受众范围最广、应用领域最多,且最为常见的雕塑类型。
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发布时间：2023-12-18 - 摘要：<正>茶竹文化景观作为具有浓厚文化气息的景区展现,需要在展出和设计的过程中凸显出浓厚的艺术性和文化性特质。铸造雕塑的应用,可以有效地提升茶竹文化景观设计的艺术气息,其雕塑本身的连续性特点、生态性体现和文化属性的融合都能够实现其在茶竹文化景观设计中的艺术性展现。可以说,在茶竹文化景观设计中引入铸造雕塑能够在提升人文景观效果的同时,更加深入地展示出艺术美的造景效果。铸造雕塑设计中充分展现了各位艺术家的艺术内涵,不管是在材质上、构景、纹饰等方面都能够凸显设计的艺术感。在不同的景观设计工作中,铸造雕塑融入了诸多铸造艺术家的心血,在现代化的园林景观设计当中,
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发布时间：2023-12-18 - 摘要：<正>全球经济的发展速度与发展进程与工业社会的生产能力和生产水平紧密相关。生产效率的提升及生产器械的优化能够显著提高企业的生产能力和产品质量,而这又能进一步促进商品的流通和经济财产的流动,这种双向的发展关系使现代社会获得了持续推陈出新的蓬勃势头。在这种时代发展背景下,若仅仅关注于经济发展或工业发展中的单一部分,可能会导致信息的壁垒与阻塞,进而不利于两方面的共同进步、共同提高。在工业生产领域内,基本零部件的生产与精密仪器的制造均需要铸造企业和铸造工厂来完成,这也使得铸造领域在整体工业社会内占据了相当重的分量,
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发布时间：2023-12-18 - 摘要：The Al powder and Fe powder compacts with 5% Fe content was fabricated by cold compression method, and the influence of pressure on compact density was investigated. Al-5 Fe alloy was fabricated by solid phase sintering, and the trend of microstructure evolution and microhardness during sintering were investigated by SEM, EDS and micro-Vickers hardness testing. The results indicate that compact density is increased rapidly with the pressure, and slows down after 500 MPa. The compact is unsintered with absence of Al3Fe intermetallic compound when the temperature is held at 500 ℃ for 30 min. When the temperature is held for over 45 minutes, the powder compact is sintered, and a granular Al3Fe intermetallic compound with an average size of 10～15 μm is formed, where the microstructure is significantly refiner than that of as-cast one, yet with micropores in the matrix. The density and micro-Vickers hardness of the sintered alloy are increased with the sintering time, which reach 2.764 g/cm3 and 38 HV0.3, respectively, with sintered for 90 min. Re-pressing and re-sintering can further enhance the density of the sintered Al-5 Fe alloy to 2.80 g/cm3 and the microhardness to 40 HV0.3, both of which are lower than those of as-cast ones, which is attributed to re-pressing and re-sintering unable to eliminate micropores completely.关键词：Al-5Fe Alloy;Al3Fe Intermetallic Compound;Sintering;Re-pressing and Re-sintering;Micro-Vickers Hardness
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发布时间：2023-12-18 - 摘要：The effects of Ca on the microstructure and mechanical properties of Mg93Zn6Y1 alloy containing icosahedral quasicrystals phase（I-phase） were investigated. The results show that the microstructures of alloys are refined by Ca addition. The grain size of primary α-Mg phase is further decreased with increasing in Ca contents.Moreover, the morphology of second phase is changed from thick skeletal to discontinuous reticular, and the volume fraction of the second phase is further reduced.The mechanical properties of the alloys are further enhanced with the increase of Ca contents. With 0.4%Ca addition, the tensile strength and elongation of the alloy reach 221 MPa and 4.2%, respectively, which are increased by 66.2% and 90.9% compared with those of the Mg93Zn6Y1 alloy.关键词：Ca;Mg93Zn6Y1 Alloy;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：To solve the macrosegregation of Al-Bi-Sn immiscible alloys, the effects of higher cooling rate and Ti addition on the microstructure of Al70Bi15Sn15 alloys were investigated, and the morphology, dimension as well as macrosegregation of Bi-Sn-rich dispersed phase were analyzed. The results indicate that the dimension of Bi-Sn-rich dispersed phase is refined and the macrosegregation is decreased with the increase of cooling rate. After Ti addition, the rod-shaped metallic compound of Al3Ti is in-situ generated and presents staggered distribution, which retards the collision and inhibits the growth of Bi-Sn dispersed phase droplets. The droplets are refined, and transformed from elliptic shape to round shape. Moreover, Ti addition also reduces solidification temperature of Bi-Sn eutectic structure. Meanwhile, the hardness of Al-Bi-Sn alloy is improved substantially by the dispersed hard compound of Al3Ti.关键词：Immiscible Alloys;Al-Bi-Sn Alloys;Solidification Microsturecture;Ti Element;Macrosegregation
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发布时间：2023-12-18 - 摘要：The effects of Al-Ti-C-B master alloy on microstructure and mechanical properties of A356 alloy were investigated. The results indicate that the addition of AlTiCB to A356 alloy can significantly refine the α-Al dendrite, and the grain size can be refined to less than 150 μm. The microstructure becomes more uniform, and the desirable addition amount of trace element AlTiCB is 1.0%, where tensile strength and elongation of the alloy reaches the highest value of 320.8 MPa and 10.0%. The TCB particles existing in the Al-TCB seed alloy play a role of the effective nucleation particle of the primary α-Al, contributing to efficient, long-lasting and stable refining effect on A356 alloy.关键词：AlTiCB;A356 Aluminum Alloy;Trace Element
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发布时间：2023-12-18 - 摘要：The high-temperature tensile tests were conducted on elevator safety Gear with Cu-1.9 Be-0.25 Co alloy after 780 ℃×4 h solid solution+320 ℃×8 h aging treatment.The stress-strain curve and the change rule of mechanical properties of alloy under different testing conditions were obtained, and the microstructure and tensile fracture morphology of the alloy were observed through optical microscope and scanning electron microscope. The results reveal that temperature has a significant effect on the tensile strength and elongation of the aged Cu-1.9 Be-0.25 Co alloy under high temperature conditions. As the tensile temperature increases, tensile strength of the alloy is gradually decreased from 262 MPa to 24.5 MPa, and the elongation and reduction of area are firstly increased and then decreased, which reach the maximum of 129.5% and 99% at 730 ℃, respectively, and the maximum reduction of area continues to decline until 780 ℃. The fracture mechanism of the alloy is transformed from the composite fracture mechanism of intergranular brittle fracture+local ductile fracture at 500 ℃ to ductile fracture at 600 ℃, 730 ℃, 780 ℃ and 830 ℃.关键词：Cu-1.9Be-0.25Co Alloy;High Temperature Tensile Behavior;Mechanical Properties and Microstructure
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发布时间：2023-12-18 - 摘要：The effects of casting methods（permanent mould casting, liquid squeeze casting, semi-solid squeeze casting） on microstructure, thermal conductivity and mechanical properties of commercial A356 aluminum alloy were investigated. The results indicate that liquid and semi-solid squeeze casting can significantly reduce defects of casting, increasing the densification of alloy. Thereinto, the grain of the liquid squeeze castings is obviously refined compared with the permanent mould casting ones, where the eutectic Si phase is converted from the coarse lath shape to the long rodlike shape. The tensile strength of the alloy is increased from 179.930 MPa to 209.446 MPa, the elongation from 3.19% to 6.93%, the hardness（HB） from 55 to 64, and the thermal conductivity from 150.064 W/（m·K） to 153.072 W/（m·K）. After semi-solid squeeze casting, the primary α-Al grains are evenly distributed with round shape. The size of eutectic Si phase with round and blunt boundary is also decreased, and segregation is eliminated. The tensile strength, elongation, hardness（HB） and thermal conductivity of the alloy reach 223.514 MPa, 13.68%, 71 and 160.220 W/（m·K）, respectively.关键词：A356 Aluminum Alloy;Semi-solid Squeeze Casting;Thermal Conductivity
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发布时间：2023-12-18 - 摘要：The 40 Cr/Q345 B bimetal was compressed and simulated by ABAQUS finite element software under different deformation temperature, strain rate and deformation. The changing law of equivalent strain, residual stress and temperature distributions in bimetal interface were analyzed, and the effects of deformation parameters on the composited interface were explored. The results indicate that the degree of interface recovery and recrystallization are increased at a higher temperature, which is beneficial to interface bonding, and the degree of interface bonding is enhanced with the deformation strain increasing. As the rate increases, the composited time is prolonged and interface reaction is sufficient, further strengthening the degree of interface bonding. By means of orthogonal tests, the optimum temperature of 1 150 ℃, strain rate of 0.1 s-1 and strain of 65% are provided. The experimental results reveal that the element diffusion in bimetal interface is sufficient with a thickness of 22 μm, achieving desirable metallurgical bonding.关键词：40Cr/Q345B Bimetal;ABAQUS Software;Equivalent Strain;Interface Bonding;Microstructure Evolution
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发布时间：2023-12-18 - 摘要：By means of XRD, SEM and EDS, the phase transformation of calcium aluminate produced by calcination of secondary aluminum ash and calcium oxide at different proportions and different temperatures was investigated. The results indicate that at 1 200 ℃, the main phase is C12A7 with a small amount of CA2 formed. At 1 400 ℃, the main phase is C12A7 with the absence of CA2 and a small amount of CA formed. At 1 600 ℃, the main phase is CA. A12C7 generated at 1 200 ℃ and 1 400 ℃ is cubic crystal system and belongs to stable C12A7. With the increase of temperature, the cell volume of C12A7 in the clinker is increased. When the mass ratio of calcium oxide to secondary alumina ash are 0.9, 1.0, 1.1 and 1.2, and the mass ratio of secondary alumina ash to calcium oxide is between 0.9 and 1.2 at 1 350 ℃, the main phase is C12A7 with a small amount of CA generated. The generated C12A7 is stable, belonging to the cubic crystal system. With the increase of the mass ratio of calcium oxide to secondary aluminum ash, the content of C12A7 is increased and the cell volume of C12A7 in the clinker is increased firstly and then decreased. When the mass ratio of secondary aluminum ash to calcium oxide is 0.9, CA content reaches the maximum value. The Ca content in the mass ratio range of 1.0～1.2 is less than that of 0.9, which is little in this stage and hardly found by XRD.关键词：Secondary Aluminum Ash;Phase Transformation;Calcium Aluminate
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发布时间：2023-12-18 - 摘要：The Cu-30 Cr2Nb alloy was prepared by rapid solidification in copper mould. The electric-ablation behaviors of the Cu-30 Cr2Nb alloy and pure copper was investigated comparatively by discharging in air. The results indicate that cooling rate is the main factor affecting the size and the morphology of Cr2Nb phase. With the cooling rate increasing, the average size of Cr2Nb particles is decreased and the morphology is transformed from long bars to short rods, then to fine spherical particles. Compared with pure copper, Cu-30 Cr2Nb alloy exhibits larger arc spot area, lower current density and smoother arc spot. The higher electric-ablation resistance of Cu-30 Cr2Nb alloy is related with the reduced current density and the heat emission of electrons from Cr2Nb particles.关键词：Electrode Materials;Electric-ablation;High Voltage Isolating Switch
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发布时间：2023-12-18 - 摘要：The influence of different casting temperatures on the microstructure evolution and properties of the Al-10 Si-0.3 Mg aluminum alloy was investiagated during die-casting process. The results show that the mechanical properties and thermal conductivity of the alloy present satisfied effects at 650 ℃. With the increase of casting temperature, cooling rate of the alloy is decreased, and the distance between primary and secondary dendrite is increased, meanhwile the size of primary crystal silicon and α-Al are increased with decrease of the strength. In addition, the number of pores in the alloy is increased, and the effective thermal area is declined with decreasing in the thermal conductivity, and the number and size of the dimples in the fracture of the alloy are decreased, which leads to the decrease of the plasticity of the alloy.关键词：Pouring Temperature;Mechanical Properties;Thermal Conductivity;Fracture Morphology
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发布时间：2023-12-18 -
Heat Treatment Process for Die-casting Automotive Beam Structural Parts Based on Experimental Design
摘要：AlSi10 MnMg alloy test bar was treated by solid solution and aging of T7 treatment. Through Minitab experiment design and response optimization tools, the influence of heat treatment process parameters on mechanical properties of castings was analyzed, and the optimized heat treatment parameters were presented. Through observing the high vacuum die casting automobile crossbeam structure, the effectiveness of the optimal parameter was verified.关键词：High Vacuum Die-casting;Structure;T7 Heat Treatment;Experimental Design- 2
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发布时间：2023-12-18 - 摘要：<正>各种（黑色和有色合金）特种铸造方法、各种有色合金（包括新能源材料、高熵合金、金属玻璃等）及复合材料的理论、工艺、设备、测试与控制、计算机应用等方面的科技成果、生产技术和现场经验,以及上述内容的国内外发展动向、行业活动、学术会议消息等。广告业务范围（1）铸造合金材料;（2）铸造原辅材料;（3）熔炼设备;（4）铸造机械;（5）铸造生产线;（6）铸造模具;（7）铸造仪器仪表;（8）计算机软件、控制设备等。
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发布时间：2023-12-18
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