最新刊期
卷 41 ， 期 7 ， 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8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）8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）企业参观
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发布时间：2023-12-18 - 摘要：The technical bottleneck of the manufacture of large complex castings in rare earth magnesium alloy（Mg-RE） with high strength and toughness were introduced. On this basis, the mutual restriction between purification and refinement inoculation, purification and composition homogenization and influence factors of strength and toughness deficiency of casting ontology in the manufacturing process were discussed. Some factors of Mg-RE were reviewed such as melt purification, refinement inoculation, composition homogenization, solidification structure simulation and control, defect inhibition and heat treatment. Two key issues for future scientific research were expounded: one is the metallurgical interaction mechanisms of homogenization-purification-inoculation in large volume Mg-RE alloy melt, the other is the transition laws of dissolution-flow-energy fields for large complex Mg-RE alloy castings and influence mechanisms on the evolution of microstructure and defects.关键词：Rare Earth Magnesium Alloy;Large Complex Casting;Large Melting Capacity;High Strength and Toughness;Structural Uniformity
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发布时间：2023-12-18 -
Numerical Simulation and Process Optimization of Low-pressure Casting for Aluminum Alloy Motor Shell
摘要：The casting process simulation software MAGMA was adopted to simulate the filling and solidification process of the low-pressure casting for aluminum alloy motor shell. The generation area of casting defects was predicted and the causes were analyzed. On this basis, the solidification process was optimized and verification experiment was conducted. The results indicate that the shrinkage cavity and porosity defects can be effectively reduced by analyzing mold temperature field, properly adjusting the mold structure and adding cooling channels to enhance the cooling effect. The performance of the motor shell produced by the optimized process was remarkably improved, where all quality and performance indicators meet the practical requirement.关键词：Motor Shell;Low-pressure Casting;Numerical Simulation;Process Optimization- 2
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发布时间：2023-12-18 - 摘要：The influence of Ca and Mn microalloying on microstructure and mechanical properties of Mg-14 Li-3 Al-0.5 Y alloy with high strength and low density was investigated. The results indicate that the addition of Ca leads to the formation of semi-continuous netlike Al2Ca phase distributed in the β-Li grain boundary in the alloy, which consumes the Al element with solid solution strengthening effect and significantly refines the β-Li. The addition of Mn can generate the Mn phase and Al2Mn3 phase dispersed in the β-Li matrix in the alloy, which inhibits the growth of β-Li. The superlight Mg-14 Li-3 Al-0.5 Y-0.2 Mn alloy with ultra-low density（1.36 g/cm3） and high elongation（11%） was developed, of which the strength and tensile strength reach 144 MPa and 175.5 MPa, respectively.关键词：Mg-Li Alloy;Single Phase β-Li;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Quantitative assessment techniques were employed to quantitatively evaluate the regional microstructure of some large titanium alloy castings, and the correlation between the surface and internal structures of castings was analyzed comparatively. The principle of sample selection and observation in the evaluation of the casting ontology was discussed. The results indicate that the average grain size and half-width of the grain size distribution obtained from the surface, central layer and cross section of the casting ontology are increased linearly with the thickness of the castings. The grain size of the surface and center layer are characterized by a normal distribution, while that of cross section is characterized by a skewed distribution. Combined with the characteristics of titanium alloy castings, it is recommended that the surface structure can be adopted to evaluate the uniformity of the casting structure in the evaluation of the casting ontology of large-scale complex precision titanium alloy.关键词：Titanium Alloy;Castings;Microstructure;Statistics;Grain Size
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发布时间：2023-12-18 - 摘要：The effects of different selective laser melting（SLM） parameters on relative density of SLM-processed rare earth modified Al-Mn alloy were investigated and the optimum parameters were presented. On this basis, the influence of heat treatment on mechanical properties of SLM-formed Al-Mn-Sc-Zr alloy was explored. The results indicate that a excessive applied laser energy density（E）leads to the spherical pores inclusion inside, which is attributed to the constituent evaporation. A low E results in the limited overlap ratio, leading to the formation of irregular pores. When E is optimized to 52.6 J/mm3, the internal defects of SLM-processed parts are reduced with improved densification level of 99.8%. Two kinds of grain morphology can be observed in the molten pool: equiaxed grains generated at the bottom and columnar grains at the center. Tensile properties and micro-hardness of the alloy can be improved effectively by heat treatment. After annealing at 300 ℃ for 4 h, specimens exhibit excellent tensile properties, where tensile strength reaches 756 MPa and elonagation is 11%.The micro-hardness of the as-deposited specimens are 131.2 HV0.2 whereas that annealed at 280 ℃ for 6 h is 178.3 HV0.2.关键词：Selective Laser Melting;Process Parameters;Heat Treatment;Al-Mn Alloy;Mechanical Propertices
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发布时间：2023-12-18 - 摘要：<正>颜色是商品外观设计的重要属性。彩色的电子产品金属外壳不仅满足了人们的审美需求,也增加了商品的附加价值。电化学沉积是目前广泛应用的金属表面着色技术,其颜色来自于由表面氧化层厚度决定的可见光干涉。由于该氧化层的厚度在产品的使用过程中不会改变,因此,该技术实现的产品颜色在使用过程中是固定的。近期,中国科学院物理研究所/北京凝聚态物理国家研究中心极端条件物理实验室的博士研究生王朋飞在导师孙永昊研究员和白海洋研究员的共同指导下,与来自物理所、
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发布时间：2023-12-18 - 摘要：<正>中国航空工业发展中心发表了《民用飞机中国市场预测2019～2038》,报告指出,未来世界民航业仍将快速增长,而中国将成为最具活力和发展最快的民航市场。从未来发展趋势看,国民经济持续稳定增长、旅游业快速发展、城市化进程加快以及国民消费升级等因素是中国航空运输市场发展的主要动力。预计2019～2038年中国航空运输将保持较块的增长速度,整个期间客运周转量（RPK）年均增长率为6.1%。在民机制造中,钛材主要用于发动机与起落架结构,
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发布时间：2023-12-18 - 摘要：<正>7月6日,LEAP系列压铸机新品发布会在上海卓美亚酒店举行。本次活动涵盖了新品发布会、圆桌论坛等诸多精彩活动。发布会上,伊之密董事总经理甄荣辉提到,在全球化的浪潮中,伊之密立足中国、放眼世界,经过近二十年的苦心经营,在注塑机、压铸机等传统领域跃居国内前列。在汽车上游产业,伊之密围绕金属材料和高分子材料成型提供解决方案,亦取得了不俗成绩。在分析压铸行业将要面临的挑战,以及介绍伊之密近年来的发展历程之余,
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发布时间：2023-12-18 - 摘要：<正>近日,重庆长安汽车联合中国汽车工程研究院股份有限公司、中复神鹰碳纤维有限责任公司、中国科学院宁波材料所等国内13家科研院所、供应商联合开发,从材料、分析、设计、制造、整车集成到试验验证等6个方面进行攻关,开发出了一款具有国际一流技术水平的多种轻质材料车身纯电动轿车,为新能源汽车能跑得更远更快减去"体重"之忧。镁合金比铝合金轻,针对此材料工艺特点,研发团队在座椅骨架和转向支撑方面采用镁合金压铸工艺,不仅零件集成化程度高,尺寸稳定,
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发布时间：2023-12-18 - 摘要：<正>随着我国航天重大科技工程战略的实施,大型铝合金环锻部件作为运载火箭贮箱的核心构件,研制变得尤为迫切。2018年底,依托中国有研科技集团有研金属复材技术有限公司先进的铝合金熔铸技术,以及新疆众和高纯铝产业优势,共同开发了应用于国家重大装备制造领域的2系、7系大规格高强高韧铝合金铸棒产品。截至目前,新疆众和可稳定生产?90 mm～?880 mm不同规格的2219、7050等多种合金牌号的铸棒产品,整体低倍晶粒度全部达到1级以上,
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发布时间：2023-12-18 - 摘要：<正>近日,中国标准化研究院资源环境研究分院于北京召开了《镁基氢化物固态储氢系统技术要求》团体标准启动会。该团体标准由上海节能协会和中国节能协会归口。中国标准化研究院资源环境研究分院、全国氢能标准化技术委员会、中国节能协会、上海市燃气管理处、上海市节能协会、有研科技集团有限公司、上海氢枫能源技术有限公司、氢储（上海）能源科技有限公司、上海交通大学、华南理工大学、复旦大学、浙江大学等单位参加了本次会议。我国镁资源储量丰富,
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发布时间：2023-12-18 - 摘要：<正>全民健身理念的快速普及为企业体育活动的开展提供了新的发展空间,不仅在体育理念方面为企业体育活动全面普及、全面发展指明了方向,还能在体育活动组织形式、组织体系、组织文化上拓宽影响范围,以全民健身理念为指导,以内涵丰富、形式多样的体育健身活动为基础,帮助工业铸造企业多元有效地开展体育活动,也进一步丰富了全民健身理念的内涵。铸造企业在全面健身理念影响下开展种类丰富的体育组织活动能帮助激发员工的体育运动意识,在科学、系统、全面的体育运动思想的指引下积极实践、高效探索,培养员工养成热爱体育、热爱运动的良好习惯。相比传统的企业体育活动,以全民健身理念为指导的企业体育活动,不仅大大提升了企业体育活动的组织效率,还能促进铸造企业内部形成良好的工作氛围,帮助铸造企业提高生产效率。
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发布时间：2023-12-18 - 摘要：<正>人们体育健身意识的持续提高,促使参加体育运动的人数不断增加,体育器材不断丰富,实用性更强。体育器材的资源利用以及可持续发展越来越受到多种因素的影响,也逐渐受到人们的重视。然而,由于缺乏专业教练员,民众在应用体育器材时遇到诸多问题,在常规体育器材铸造过程中无法预测使用者的水平,使用以及维护不当造成的误差也对体育器材的资源利用、使用寿命与使用效果造成直接影响。在此层面上,应加强我国体育器材的资源利用以及可持续发展的现状分析。所以,笔者将以镁合金为例,分析提升铸造技术对体育器材的潜在影响,希望为我国铸造体育器材的技术提升提供参考。
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发布时间：2023-12-18 - 摘要：<正>《百工录:金属锻造艺术》一书是锻造工艺中美学艺术应用的专业著作,该书对美学艺术在锻造工艺品中应用理论知识及实战技巧进行了系统归纳与总结,推进了现代锻造工艺品美学艺术专业人才培养及设计者艺术素养的提升。在理论研究与实践指导方面,该书对金属锻造艺术的概念、历史起源、历史变革、发展概况、传承创作、锻造艺术工具、基本使用方法、金属锻造艺术发展情况、经典铸造工艺品进行了鉴赏,并分析了传统金属锻造艺术方法和现代艺术铸造工艺,最后分析了金属锻造艺术作品工艺案例,让艺术爱好者能有效感受到锻造工艺的美学魅力。
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发布时间：2023-12-18 - 摘要：<正>铸造设备课程是铸造专业中重要的理论课,其教学主旨在于教授学生铸造生产的各个工序中所采用的设备和工艺等基础知识,对铸造车间的设计以及改造,以及气压和液压传动的系统知识等,通常需要通过考试的形式来确保教学的效果。铸造设备课程的考试主要以教育目标为基本依据,即根据教学大纲来制定考试内容和规定考试范围。课程的考试过程均需要围绕着教学大纲来进行规范,这样才能够实现人才培养的目标,提升课程教学的效率和质量。传统的考试模式需要教师进行出题制作考卷,
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发布时间：2023-12-18 - 摘要：<正>随着社会科技水平的不断进步,工业生产能力和发展规模也逐渐扩大,工业生产水平的发展给人类带来了文明的进步,同时也为我们的生活带来了很多的便利,但在过去工业发展的进程中,对于工业上产的质量和效率关注较多,对其中隐含的艺术性特点关注不足。随着社会整体经济水平的不断发展,工业生产经营的发展目标呈现更加多元化的表现,铸造企业作为工业结构的主要组成部分,其个体发展的多元化会对整个工业领域的发展起到重要影响。
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发布时间：2023-12-18 - 摘要：<正>科学技术的发展影响着当前我国工业整体发展水平的进程,而其中铸造产业的技术进步与产业水平影响着我国航天、国防、智能制造、汽车、船舶等诸多行业发展。经过近三十年的发展,由于各行业对于铸造技术精度与性能要求的不断提高,铸造行业面临着诸多困境与挑战。对于铸造行业的结构调整、产业布局的深度优化,高级人才的专业培养以及两化融合领域的发展和行业本身的创新驱动都成为铸造行业面临的机遇。与此同时,美、英、德、法等国在铸造领域的发展势头也不容小觑,
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发布时间：2023-12-18 - 摘要：<正>随着近年来科学技术快速发展及社会主义文化艺术事业全面建设,有色金属材料工艺品开发设计越来越受到人们的重视,要满足当前社会主流艺术文化创新的需求,要关注美学艺术,进而满足当代工艺品美学快速发展的需求,并能促进有色金属行业从业者艺术审美素养全面提升。基于美术艺术视角的有色工艺品开发与设计最关键的环节在于将当前社会多种美学意识、美学理念、艺术思维、美学元素、文艺思想融入到工艺品设计与锻造过程中,不仅要以先进的美学理念、艺术思想、
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发布时间：2023-12-18 - 摘要：<正>在当今社会经济发展和科学技术发展的推动下,互联网在各行各业都产生了巨大的影响,不仅影响着人们的工作和生活,也影响着各行各业的发展。小型企业是中国国民经济发展和社会经济发展的主体和基础,是强国和富民的重要保障。对于社会经济发展来说,它在增加税收、改善民生、增加就业、完善市场经济结构、保障金融经济稳定发展等方面发挥着巨大作用。在对小型企业进行定义时,其主要包含微型企业、小企业、家族小企业等企业的总称。我国小型企业众多,涉及范围较广,面向市场较全面,主要集中在制造业、批发销售等行业,具有企业多、
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发布时间：2023-12-18 - 摘要：The A359 alloy was prepared by lattice-type metal mold with different melt cooling rates, and further treated by T6 heat treatment. On this basis, the effects of melt cooling rate and heat treatment on the mechanical properties of the alloy were investigated. The results indicate that the tensile strength and elongation of the as-cast and T6 treated alloys are increased simultaneously with the increase of melt cooling rate. Furthermore, the influence mechanism of melt cooling rate on the evolution of mechanical properties of the alloy was analyzed combining with the microstructure characterization and the theory of metal strengthening and toughening. The strength and ductility of the A359 alloy are increased simultaneously with the increase of melt cooling rate, which is mainly attributed to the refinement of non-equilibrium solidification microstructure, supersaturated solution of solute atoms, large amounts of nano Si particles in Al matrix and large amounts of nano Al particles in eutectic Si.关键词：Casting Aluminum Alloys;Melt Cooling Rate;Solidification;Heat Treatment;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Accrording to coarse structure, macrosegregation and coarse second phase existing in the traditional large scale 2219 alloy ingots, the 2219 alloy ingots with ?630 mm were fabricated by DC casting with internal electromagnetic melt treatment. The solidification microstructure and composition of the ingots were investigated by OM, spectrometer and SEM. The effects of electromagnetic melt treatment on the microstructure refinement of ingots were investigated, and the distribution law of solute elements was revealed. The results indicate that the grains of ingots prepared by the internal electromagnetic melt treatment are finer along the radial direction compared with that of ones by ordinary DC casting, of which the average size is in the range of 200～300 μm. The microstructure is evenly distributed overall with the obviously refined intermetallic compound, and the second intercrystalline phase is distributed in a discontinuous net, where Cu is more evenly distributed.关键词：Internal Electromagnetic Melt Treatment;2219 Aluminium Alloy;Grain Refinement;Larg Scale Ingot;Second Phase
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发布时间：2023-12-18 - 摘要：The directionally solidified single crystal DD4 superalloy was prepared using the spiral grain selector. Microstructure evolution and grain competitive growth of the starter block and spiral part in spiral selector were analyzed. The results indicate that with the increase of the height of the starter block, the primary dendrite spacing is increased and the grain density is decreased significantly, and the texture of <001> is strengthened. The orientation deflection angle of the initial grains is less than 10 ° at the height of the starter block of 20 mm. Finally, about 35 grains with obvious size and good orientation can be entered into the spiral part. Grains located in the inner edge of spiral channel were dominant in the process of spiral selection and were the easiest to be selected. The single crystal screening process was realized at the 1/3 helix height of the spiral part, and the single crystal with the deviation angle of 8.9° was prepared.关键词：Directional Solidification;Ni-based Single Crystal Superalloy;Spiral Grain Selector;Crystal Competitive Growth;Grain Orientation
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发布时间：2023-12-18 - 摘要：Effects of four methods including C2Cl6 degassing, ultrasonic degassing, C2Cl6/ultrasonic combination degassing and Ar degassing on hydrogen content and mechanical properties of 2024 alloy were investigated. The results indicate that after C2Cl6-ultrasonic combination degassing, the hydrogen content reaches the minimum, corresponding to the optimal properties. The correlation of hydrogen content with mechanical properties of 2024 alloy was investigated. The result reveal that tensile properties and elongation at room temperature are continuously increased with the decrease of hydrogen content. When the hydrogen content is less than 0.12 cm3/100 g Al, the yield strength has no significant increase with the decrease of hydrogen content.关键词：2024 Alloy;Hydrogen Content;Mechanical Properties;C2Cl6-Ultrasonic Combination
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发布时间：2023-12-18 - 摘要：Al-Si alloys have excellent casting properties and good processing properties. After modification and heat treatments, the mechanical properties and corrosion resistance of Al-Si alloys can be further improved, which are widely used casting aluminum alloys. However, the rapid development of rail transportation and aerospace has put forward higher requirements for the performance of Al-Si alloys. Squeeze casting Al alloy parts have the advantages of weak anisotropic, fewer casting defects and good mechanical properties, etc., which have broad prospects for application in rail transportation and aerospace. The effects of（semi-solid） squeeze casting process parameters and heat treatment parameters on microstructural evolution and performance of squeeze casting Al-Si alloys were reviewed, which provided a reference for the preparation of high performance Al-Si alloys by squeeze casting in the future.关键词：Squeeze Casting;Al-Si Alloys;Semi-solid;Heat Treatments;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Lightweight is the inevitable trend of equipment development in the future, which indicates low fuel consumption, long distance, high mobility and high payload especially for vehicle equipment. Therefore, alloys with high-strength and cushy process forming are the foundation and key to realize the lightweight of equipment, which has been always concerned. High entropy alloy is a kind of engineering material based on the new design concept with high hardness, high strength, good oxidation resistance, corrosion resistance and other characteristics, which has a wide potential prospect in industrial application. The application prospect and field of lightweight high entropy alloy in vehicle equipment were analyzed in order to provide theoretical and technical support for promoting the technical upgrading of vehicle equipment, especially military vehicle equipment, and meeting the requirements of future combat.关键词：Lightweight High Entropy Alloy;Vehicle Equipment;Lightweight
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发布时间：2023-12-18 - 摘要：Metal core bar can enhance the air permeability and improve the core strength. However, the traditional design method of metal core bar is very simple and mainly relies on artificial experience which makes the metal core bar material distribution unreasonable. Therefore, a topology optimization method for metal core bar structure was proposed in the sand casting. SIMP（Solid Isotropic Material with Penalizatio） topology optimization model was used to optimize the structure of metal core bar. Meanwhile, the optimized metal core bar was applied to the bending strength experiment of sand core. The experimental results reveal that difference between the bending strength before and after optimization can be neglected. Compared with the normal shape of the metal core bar, the weight of the optimized core bar is reduced by more than 59.9%, exhibiting a satisfied effects.关键词：Metal Core Bar;Topology Optimization;Sand Casting;SIMP
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发布时间：2023-12-18 - 摘要：AlFeCrCoCu high-entropy alloy particles（HEAp） reinforced aluminum alloy matrix composites were fabricated by powder metallurgy, and the effects of mass fraction of HEAp on the microstructure and properties of AlFeCrCoCu/ZL109 composites were investigated. The results indicate that high-entropy alloy particles are evenly distributed in the matrix, and the reinforcement is well combined with the matrix. However, excessive high-entropy alloy content leads to the agglomeration of particles. When the mass fraction of the high-entropy alloy is 15%, the tensile strength of the composites reaches the maximum of 414 MPa, which is 128% higher than that of matrix. When the mass fraction is 20%, the hardness reaches the maximum of 154.8 HV0.1, which is 179.9% higher than that of matrix with the lowest thermal expansion coefficient. Therefore, the strength and hardness of aluminum alloys can be effectively improved by high-entropy alloy particles, and the composites with the required thermal expansion coefficient can be obtained by adjusting the content of the high-entropy alloy.关键词：Metal Matrix Composite;High-entropy Alloy;Microstructure;Mechanical Properties;Thermal Expansion Coefficient
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发布时间：2023-12-18 -
Microstructure and Mechanical Properties of Squeezing Casting SiCp/AZ91D Magnesium Matrix Composites
摘要：8.5%SiCp/AZ91 D matrix composites were prepared by semi-solid stirring at 585 ℃ and holding at 595 ℃ as well as squeezing casting at 585 ℃. After solid solution treatment at 415 ℃ for 24 h and aging treatment at 220 ℃ for 8 h, the microstructure and mechanical properties of the composites prepared were investigated by OM,SEM, EDS and tensile testing.The results reveal that after squeezing casting and heat treatment, the microstructure and mechanical properties of the composites can be improved. After squeezing casting, grain morphology in the composites is refined to equiaxed structure, in which amounts of SiC particles occupy the grain boundary. After solid solution and aging treatment, amounts of lamellar Mg17Al12 phase with a certain orientation can be observed in the microstructure of the composites. The tensile strength, elongation and hardness of the squeezing casting composites reach 191.06 MPa, 1.75% and 143.4 HV, while those of ones after solid solution and aging treatment are 241.26 MPa, 4.22% and 152.5 HV, respectively.关键词：Squeezing Casting;SiCp/AZ91D Composites;Microstructure;Performance- 2
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发布时间：2023-12-18 - 摘要：Effects of aging temperature and duration on the strength, electrical conductivity and microstructure of Cu-1.7 Ni-0.5 Be alloy were investigated by OM, SEM, EDS and tensile testing. The results indicate that the comprehensive performance of Cu-1.7 Ni-0.5 Be alloy is desirable after solid solution at 920 ℃ for 1 h and aged at 480 ℃ for 6 h, where the electrical conductivity, tensile strength and elongation reach 34.278 MS/m, 758 MPa and 21%, respectively. In the range of 0.25～10 h, absence of precipitated phase is observed at the beginning of aging, and the alloy strengthening is dominated by the G.P. region. With the increase of aging time, the precipitated phase is generated gradually and exhibits dispersed distribution. When aging for 10 h, the precipitation at 510 ℃ is coarser than that of ones at 480 ℃. Under the aging temperature of 450～510 ℃, the tensile strength is increased at first and then decreased with the increase of aging time on the whole. The peak time of the alloy at 450 ℃, 480 ℃ and 510 ℃ are 8 h, 6 h and 2 h, respectively. The higher the aging temperature is, the earlier the peak value appears. With the increase of aging time, the electrical conductivity is increased gradually with a slower rate. The main fracture mode is dominated by ductile fracture under normal temperature stretch.关键词：Aging;Tensile Strength;Elongation;Conductivity;Precipitation Phase
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发布时间：2023-12-18 - 摘要：Al-Mn alloys with different Mn contents（1.4%、1.7%、2.0%、2.3%,mass fraction）were prepared by permanent mould casting. The microstructure, mechanical properties and anodic oxidation properties of the alloy ingots were characterized by SEM, EDS and tensile testing. The results show that the second phase in Al-Mn alloy consists largely of Al6Mn with large diamond shape, long strip shape, spherical shape or short rod shape. The fluidity of the alloy is increased firstly and then decreased. When Mn content is 2.0%, the alloy shows the satisfied fluidity, which is up to 97% of ADC12 alloy at the same level. The strength of alloy is increased firstly and then decreased, while the elongation is decreased continuously. When Mn content is 1.7%, the comprehensive mechanical properties and anodizing properties can be obtained with the desirable effects. The alloy presents great anodizing performance with the color difference less than 0.5, and the thickness of anodic oxide film is more than 10 μm.
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发布时间：2023-12-18 - 摘要：The interface compatibility of U-8 Mo alloy and Zr-4 alloy was investigated by diffusion-couple method through diffusion test at 900 ℃ and 1 000 ℃ for 6 and 12 h, respectively. The result indicates that the diffusion phenomenon can be observed significantly between U-8 Mo alloy and Zr-4 alloy. The diffusion rate of Mo element is faster during the diffusion process of U-8 Mo to Zr-4, leading to the formation of Mo2Zr phase. The U element exists in Zr-base in form of solid solution, and U-8 Mo alloy has good compatibility with Zr-4 alloy.关键词：U-8Mo Alloy;Zr-4 Alloy;Thermal Diffusion;Compatibility
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发布时间：2023-12-18 - 摘要：Taking 8079 aluminum alloy as the research object, sheet for double zero aluminum foil was cast rolled directly with electrolytic aluminum liquid. The effects of different cooling intensities on the grain structure and central layer segregation of 8079 aluminum alloy cast-rolled plate were systematically investigated by means of optical microscopy（OM）, scanning electron microscopy（SEM） and energy dispersive spectrometer（EDS）. The results indicate that when the cooling intensity is 3 500 W/（m2·K）, the grain is coarsened with grade 3, and the segregation phenomenon presents severe in the center layer of tested specimens. When the cooling intensity is increased to 4 000 W/（m2·K）, the grain size is gradually decreased, and the central layer segregation is weakened. When the cooling intensity is 4 500～5 500 W/（m2·K）, the grain size keeps stable with the increase of cooling intensity, which is about 54 μm, and absence of segregation is observed in the center layer. When the cooling intensity is increased to 6 000 W/（m2·K）, the grain size is excessively fine and absence of obvious segregation is observed in the center layer. When the cooling intensity ranging from 4 500 W/（m2·K） to 5 500 W/（m2·K）, the aluminum alloy cast-rolled plate without central segregation can be obtained, which exhibits uniform and fine microstructure.关键词：Cooling Intensity;8079 Aluminum Alloy;Cast-rolled Plate;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：By hardness and tensile testing, optical microscope, scanning electron microscope and transmission electron microscope, the effects of different heat treatment processes on the microstructure and mechanical properties of high pressure diecasting（HPDC） AlSi10 MnMg alloy shock tower were investiagted. The results indicate that T5 and T6 heat treatment can improve the microstructure and mechanical properties of the shock tower. After T5 heat treatment, the silicon phase in the structure is spheroidized, and the plasticity of the shock tower is increased with the increase of heat treatment temperature. After T5（350 ℃×2 h） heat treatment, the elongation reaches 16.32%, which is twice of that of the as-cast state. After T6 heat treatment, the Mg2Si and other strengthening phases can be precipitated, however the size is increased with the increase of temperature, while the strength of shock tower is decreased continuously with the rise of the temperature. After T6（500 ℃×2 h+175 ℃×6 h） heat treatment, the yield strength, tensile strength and elongation of the shock tower reach 217.06 MPa, 294.28 MPa and 10.25%, respectively.关键词：AlSi10MnMg Alloy;Die-casting Shock Tower;Aging Treatment;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Thermomechanical coupling model for TC4 bar heating was established based on the Abaqus finite element simulation software. TC4 alloy bars with different diameters and 0.2 mm glass coating on the surface were directly heated into the furnace at 945 ℃ and analyzed. The results indicate that the maximum equivalent stress suffered by the bar during heating is increased with the increase of diameter, which is located at the bottom of the bar（the contact part with the furnace）. When the diameter of the bar is more than 40 mm, the maximum equivalent stress suffered by the bar during the heating process is greater than the yield strength at the corresponding temperature. The maximum principal stress suffered by the bar during heating is increased with the increase of diameter. Temperatures where the different diameters bearing the maximum principal stress height are all about 35 ℃. When the diameter of the bar is 100 mm, the maximum principal stress is 198.2 MPa, and the safety factor for brittle cracking is 4.8, while that of the remaining diameters are all greater than 4.8. TC4 alloy bars with a diameter of ≤40 mm are coated with 0.2 mm glass on the surface. When heated directly into the furnace at 945 ℃, the shortest holding time can be calculated.关键词：TC4 Alloy;Heating Before Forging;Stress Analysis;Numerical Simulation
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发布时间：2023-12-18 - 摘要：For the amorphous master alloy with melting point of 1 250 ℃, through adding B2O3 to the CaO-SiO2-Al2O3 base slag system, the low melting temperature slag system containing boron was designed. The phase diagram of CaO-SiO2-Al2O3-B2O3 quaternary refining slag system was analyzed by Factage7.2 software simulation calculation. With the proportion of B2O3 increased from 7% to 19%, the area ratio of low melting temperature in the phase diagram is increased from 5% to 46%. With controlling the content of B2O3 at 13%～16%, the melting temperature is 1 100～1 200 ℃, which is suitable for the smelting of amorphous master alloy. The experimental results indicate that the melting temperature is 1 150±25 ℃, which is consistent with the simulated ones.关键词：Refining Slag;Boron Oxide;Melting Temperature
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发布时间：2023-12-18 - 摘要：The semi-solid slurry of 6061 aluminum alloy was prepared via a serpentine pouring channel. The influences of pouring temperature, bend inner diameterand the content of Si element on microstructure of the alloy slurry were investigated. The results indicate that the semi-solid slurry prepared by the serpentine channel has superior spheroidization and refinement effects to the traditional casting process, where the primary α-Al grains are refined to 66.37 μm. With the Si content increasing, the spheroidizing and refining effect of grains become more significant. When the Si content is 1.2%, the average grain diameter and shape factor of the primary α-Al grain are 42.85 μm and 0.83, respectively. When the pouring temperature is 660～690 ℃ and the channel inner diameter is 20 mm, the prepared semi-solid slurry of 6061 aluminum alloy has a desirable effect.关键词：Serpentine Channel;6061 Aluminum Alloy;Semi-solid;Microstructure Evolution
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发布时间：2023-12-18 - 摘要：The effects of solid solution time and aging time on the microstructure and mechanical properties of ZL205 A alloy specimens was investigated at T6 state formed by selective laser melting（SLM）. The result indicate that when the solution time is increased from 10 h to 14 h with the aging time of 4 h, the solid solubility is increased and a large amount of the second θ-Al2Cu phases are precipitated and uniformly distributed in the α-Al substrate, where the tensile strength is increased from 327 MPa to 369.26 MPa. With the aging time increasing gradually, the mechanical properties of the specimens present a trend of rising firstly and then declining. The precipitated θ phase becomes larger after aging for 6 h, resulting in the decline of the mechanical properties of the formed specimens. After solid solution for 14 h and aging for 6 h, the tensile strength, yield strength and the elongation reach 387.84 MPa, 241 MPa and 6.77%, respectively. Therefore, the desirable tensile strength and elongation can be obtained by solid solution at 538 ℃ for 14 h and aging at 150 ℃ for 6 h.关键词：Selective Laser Melting;ZL205A Alloy;Heat Treatment;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Aiming at the problem of unstable mechanical properties of the differential pressure casting aluminum alloy long arm parts, the origination was analyzed through the observation of the microstructure and the fracture morphology of the tensile specimen. The results reveal that after refining, modification and grain refinement treatments, the A356 alloy for aluminum alloy long arm parts shows normal microstructure with refined grains, few blowholes and a small amount of oxide inclusions, which have little effect on its instability of mechanical properties. However, with non-proper mold temperature, the porosities are the main cause for the unstable mechanical properties, which appear when the aluminum alloy liquid is solidified and crystallized under absence of feeding pressure at the thicker part of the outermost end of the aluminum alloy long arm.关键词：Differential Pressure Casting;Aluminum Alloy Long Arm;Microstructure;Fracture Morphology
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发布时间：2023-12-18 - 摘要：In order to solve the problem of serious defects in the traditional gravity filling casting of marine aluminum alloy electrical box, a low-pressure casting scheme was designed and simulated by the ProCAST software. According to the simulation results, the process scheme was optimized. The reasonable pouring position was selected with the ingate added in the box, and the riser was added in the upper part of the casting, which could not only effectively feed the casting, but also collect scum, thus improving the quality of the casting.关键词：Low Pressure Die Casting;ProCAST;Shrinkage Porosity;Riser;Aluminum Alloy
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发布时间：2023-12-18 - 摘要：The effects of cleanliness control on casting cavity and the oil circuit become more and more serious, thus the influence of accurate detection technology on the surface quality and tailings was paid attention. The endoscopic detection rule was explored, which provided basis for the detection accuracy and promoted the improvement of casting surface quality of the inner chamber and the oil circuit.关键词：Casting Defects;Oil Circuit;Endoscopic Detection
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发布时间：2023-12-18 - 摘要：The tenons of the turbine blades in aeroengine show linear fluorescent indication after grinding the tenons. The microstructures near the tenons before and after grinding was compared by optical microscopy and scanning electron microscopy（SEM）. The origination for the cracks in blade tenon after griding was analyzed based on the production process of the blades, and the corresponding measures were proposed. The results indicate that there exists a certain degree of microporosity at the position indicated by fluorescence, and the dispersed holes are torn along the direction of shear stress under the effect of grinding stress to form internal connected channels, leading to the linear fluorescent indication. Microporosity can be eliminated by decreasing the pulling rate and prolonging the pulling time appropriately, thus avoiding grinding cracks.关键词：Cracks;Grinding Machining;Microporosity;Superalloys
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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。一、征文内容（所有铸造相关技术）1.消失模、V法、实型铸造的基本理论、基本原理、生产设备、检测设备与技术、试验与分析技术、生产应用技术、环保系统、原理与技术、生产管理技术;
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发布时间：2023-12-18
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