最新刊期
卷 41 ， 期 9 ， 2021
- 摘要：<正>时间:2021年12月3-6日地点:南昌·嘉莱特精典国际酒店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
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发布时间：2023-12-18 - 摘要：The effects of process parameters, including laser power, scanning speed, scanning interval and scanning strategy, on surface quality of selective laser melting（SLM） forming GH4169 alloy parts were analyzed. The experimental data was orthogonally analyzed and the surface of formed parts under different process parameters were observed. The results indicate that with the laser power of 320 W, the scanning speed of 1 000 mm/s, the scanning interval of 60 μm, the scanning rotation angle of 67° and the volume energy density in the range of 130～150 J/mm3, the cladding channels are smooth, even, straight, and especially well-lapped, and the spheroidization and powders adhesion phenomenon are absent on the surface. Therefore, the surface is flat with the desirable quality and the relatively low Ra value.关键词：Selective Laser Melting;GH4169 Alloy;Process Parameters;Surface Quality
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发布时间：2023-12-18 - 摘要：Two kinds of high entropy alloys, CrCuFeMnNi and CoCrCuFeMnNi, were prepared by powder metallurgy. The atmospheric oxidation weight gain of the alloys was measured at 800 ℃. The phases of oxide and morphology of oxidation section were analyzed by X-ray diffraction and scanning electron microscopy, respectively. The atmospheric oxidation behavior of both alloys was discussed. The results indicate that the atmospheric oxidation kinetic curves of the alloys approximately follow the parabolic law. At the initial stage of oxidation, the oxidation weight gain of each alloy is faster, and slows down with the increase of oxidation time. In the rapid oxidation stage, the KP values of CrCuFeMnNi and CoCrCuFeMnNi alloys reach 6.64×10-11 g2·cm-4·s-1 and 3.55×10-11 g2·cm-4·s-1, respectively. In the slow oxidation stage, the KP values of the two alloys are 6.05×10-12 g2·cm-4·s-1 and 2.02×10-11 g2·cm-4·s-1, respectively, indicating that the oxidation resistance of the Co-free alloy is better. The oxidation products of the alloys are mainly Mn4O3, Mn3O2 and Cr2O3. After oxidation, a dense Cr2O3 film is formed between the substrate and the oxide layer, which inhibits the oxidation rate of the inner layer and enhances the oxidation resistance of the Co-free alloy. The oxidation mechanism of the alloys is dominated by selective oxidation.关键词：High Entropy Alloy;Powder Metallurgy;Atmosphere Oxidation;Oxidation Mechanism
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发布时间：2023-12-18 - 摘要：<正>近日,静冈大学工学部的菊池将一准教授、东京电机大学井尻政孝助教、雅马哈发动机材料技术部组成的共同研究团队已经成功开发出无需加热就能在钛合金表面形成硬质氮化层的技术。钛合金质量轻、强度高、不生锈,作为结构材料实际应用广泛。但是,为扩大钛合金的适用范围,必须克服不耐磨损的缺点。目前主要利用氮扩散在钛表面涂上一层使钛坚硬、耐磨损的膜,但这种方法需要对钛合金进行长时间加热,会造成钛的组织粗大化,强度降低。无需加热的短时间表面硬化工艺的开发,将突破钛合金的多功能化。
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发布时间：2023-12-18 - 摘要：<正>一体化压铸是对传统汽车制造工艺（冲压+焊接）的颠覆,其在成本、效率、加工质量等方面拥有巨大优势,未来在新能源汽车领域有望快速渗透。一体化压铸成型后,需要配套相应机床进行压铸件的毛刺与毛边等的切削,若考虑该工艺用于整车加工,根据测算,中国年产800万辆新能源汽车对应机床（以龙门为主）总需求在440亿元左右,年均为88亿元。预计从2022年开始,随着其他新能源汽车厂商逐步跟进推动一体压铸工艺,相关机床需求将迎来爆发。
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发布时间：2023-12-18 - 摘要：<正>中国国家粮食和物资储备局发布公告,近期将组织投放第3批国家储备铜铝锌共计15万吨,其中包括3万吨国家储备铜、7万吨国家储备铝、5万吨国家储备锌。据悉,本次投放将尽可能向中小企业倾斜,以切实缓解企业的生产经营压力,同时引导市场价格回归合理区间。公告显示,此次销售通过网上竞价平台进行公开竞价,集团企业及其关联企业报名数量限1家。此次公开竞价时间为9月1日。
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发布时间：2023-12-18 - 摘要：<正>近日,浙江万丰奥威汽轮股份有限公司（以下简称"万丰奥威"）发布2021年半年度报告。报告显示,2021年上半年,万丰奥威实现营收55.47亿元,同比增长25.44%;实现扣非净利润1.66亿元,同比增长22.32%。随着国内新冠肺炎疫情得到有效控制,公司经营恢复正常,加之公司"双引擎"战略成效明显,汽车部件产业与飞机制造产业双双发力,尤其是铝合金等金属材料的轻量化应用,为公司业绩增长提供了支撑。
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发布时间：2023-12-18 - 摘要：<正>韩国政府决定将核心稀有金属平均储量增加1倍,确保100天使用量,到2025年还将挖掘并培养稀有金属百大核心企业。韩国产业部有关人士表示,目前稀有金属需求急剧上升,全球为确保这些金属展开激烈竞争,但储藏和生产集中于部分地区,一直都存在供求不平衡的风险,因此政府将稀有金属产业发展对策的重点放在建立稳定的供应体系之上。
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发布时间：2023-12-18 - 摘要：<正>硅橡胶以其优异的耐候性、耐高低温性、电绝缘性、耐辐射性、生物惰性等在电气、电子、办公设备、汽车、建筑、医疗、食品和人造器官等领域有着广泛的应用。随着现代科学技术的发展,各领域对硅橡胶耐热性的要求越来越高,如航空发动机的机舱温度经常在300℃以上,对橡胶配件提出了更高的耐油、耐高温要求。包头稀土研究院稀土分离与应用团队联合中国航发北京航空材料研究院成功开发出一种用于硅橡胶、氟硅橡胶的轻稀土耐热剂产品。该产品经中国航发北京航空材料研究院试验验证,可有效提高硅橡胶、氟硅橡胶材料的使用温度,提升其耐热等级。
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发布时间：2023-12-18 - 摘要：<正>金属锻造属于金属材料加工的一种工艺手段,通过锻造工艺,人们可以制造出应用于生产、生活工作中的工具或设备,这些设备或工具或许是能够提高某项工作的开展效率,或是实现某项工作的必需品。因此,它对人们生产和生活中具有实用价值。金属的锻造件在机械设备上通常是作为其所必需的工具或工具上的零件。也就是说锻造是一种加工金属的工艺。而它加工出来的成品通常可以被称为锻造件。锻造件作为机械设备上的零部件,
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发布时间：2023-12-18 - 摘要：<正>近年来,随着经济水平的提升与发展,我国各项基础设施日趋完善,科学技术能力也得到快速发展,这有效的促进了我国各个产业与领域的均衡发展与创新突破,而在这种社会大环境下,居民的生活质量也得到了显著提升,其物质生活得到了进一步满足、精神世界追求正朝向更高境界发展,因此,当我国民众面对现下社会发展状态时,常常会对自身发展与外界环境因素提出更高的要求,进而在为自我提高奠定基础的前提下,为下一代生活环境的建设做好准备,
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发布时间：2023-12-18 - 摘要：<正>随着信息数据相关技术的快速迭代与发展,实施教学的途径和场景都有了新的发展。通过构建网络学习平台,实施线上教学早已经成为了课堂教学的一种补充途径。伴随着学校信息化平台基础建设的不断完善,线上教学现已经成为高校教育的另一块阵地。"课堂教学+线上教学"这种混合式教学模式所取得教学成果也是有目共睹的,但这种混合式教学模式在教学实践中也存在一定的不足,需要加以改善。本文将结合《供电工程》课程,以智慧树互联网课堂教学平台为载体,探究如何进一步加强线上教学对提升教学质量和教学水平。
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发布时间：2023-12-18 - 摘要：<正>目前中国已经成为世界上的第一铸造业大国,但因我国铸造行业发展时间较晚,还未达到铸造强国的目标,社会整体现代化进程的发展需要机械领域的支撑,机械行业的现代化进程需要铸造行业的支持。现如今,大型铸造企业的技术能力和设备组成结构、管理机制都比较完善,能够生产大量复杂型号的铸件,在铸造业市场中处于领先地位。但在激烈的市场竞争环境当中,依然有一些中小型铸造企业在竞争中需求生存,其生产条件相近,
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发布时间：2023-12-18 - 摘要：<正>铸造业是我国金属加工制品的基础产业,对如何设计铸造厂房的要求也有一套标准需要遵循。铸造业包含大型铸造企业、中小型铸造企业、小型铸造企业,鉴于这些企业的种类多,对铸造厂房设计的要求自然也就不一样。关于铸造厂房的设计和铸件成品库的防火设计问题,向专注于设计专业的学者们推荐一本书《铸造车间和工厂设计原理》,这本书是专注于介绍我国从事铸造业方面的科研设计和教学,让科研人员和学习人员能更深人的了解国际上的铸造工厂设计方面的经验,
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发布时间：2023-12-18 - 摘要：<正>舞蹈艺术是现代化素质教育当中比较重要的一项内容,对于受教育者的个体素质发展也有积极的作用,也符合素质教育的基本要求。分析目前舞蹈艺术教学课程和素质教育的关系可知,强化舞蹈艺术教育水平,提高学生的舞蹈艺术修养能够实现素质教育发展水平的总体提升,可以促进学生个体意志品质的发展,也能够从艺术的角度培养其心理素质的养成,对于学生艺术素养和审美情绪的发展也有积极的意义。在舞蹈艺术修养的养成过程中引入素质教育的相关内容,可以强化受教育者的个体价值,
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发布时间：2023-12-18 - 摘要：<正>"更高、更快、更强,拼搏与进取"是现代体育精神的核心,其精神运用到企业文化建设中将对企业文化的健康可持续发展、员工精神面貌的再塑造、企业核心文化的竞争力以及行业引领作用起到积极的推动作用。将以铸造企业为代表,阐述如何将体育精神的精髓与价值更好地植入铸造企业内部文化构建,为提升我国铸造企业的整体管理水平、文化价值的丰富等发展提供精神支柱,探讨体育精神在其内在融合、创新、发展的方式与途径,为更多铸造企业以此为契机提供价值参考。
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发布时间：2023-12-18 - 摘要：<正>近年来,随着我国科学技术水平的快速发展,且伴随着经济水平与资本投资的进一步加大,我国工业社会的发展进人了一个全新发展时代,工业领域内的各行各业都争相将自己的生产技术、生产能力与生产规模进行再创新与再提高,这也促使着我国整体工业水平不断向世界先进水平前进。同时,随着新兴科学技术与高新生产模式的不断提出,工业领域内的各项生产设施与企业管理制度得到了进一步优化,其成功实现了由落后劳动密集型产业向先进科技带动专业性人才产业的逐步转变,而这种包含了大量高精尖生产技术的工业发展转变也被称为第四次工业革命。在工业4.0时代,
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发布时间：2023-12-18 - 摘要：The microstructure, mechanical properties and anti-seizure properties of Al-Cu-Mg alloy with low melting point component Bi were investigated. The phase composition of the alloy was observed by XRD, and the microstructure, fracture morphology and wear surface of the alloy were observed by SEM and EDS. The results reveal that with the Bi addition of 2%, the distribution of spherical Bi-rich phase appears in the alloy, which is basically composed of Mg3Bi2with small size. However, the core/shell structure with Mg3Bi2 core and Bi shell was observed at Bi-rich phase particles with large size. The tensile strength, elongation and hardness of the alloy are decreased by 10%, 21% and 8.5%, respectively, after adding 2.6%Bi, indicating that Bi has a certain weakening effect on the mechanical properties of the alloy. Friction and wear experiments expound that the anti-seizure ability of the alloy is greatly improved after adding Bi, where the load bearing capacity is increased from 1 700 N to 5 500 N. Moreover, the banded Bi-rich phase is smeared on the worn surface, playing a role of self-lubrication.关键词：Low Melting Point Component;Bi-rich Phase;Mg3Bi2Phase;Core/Shell Structure;Self-lubrication
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发布时间：2023-12-18 - 摘要：In recent decades, the prediction and control of shrinkage porosity and cavity defects in ingot were investigated. The distribution forms and formation mechanism of shrinkage porosity and cavity defects in steel ingot were expounded. Various criteria to predict the distribution of shrinkage porosity and cavity was summarized in detail, and the control measures were introduced. The development of the criterion of shrinkage porosity and cavity in ingot casting was prospected, and the issues of controlling shrinkage porosity and cavity defects were concluded.关键词：Steel Ingot;Solidification;Shrinkage Porosity;Cavity;Criteria
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发布时间：2023-12-18 - 摘要：Aluminum based materials have been paid more attention due to the light weight, good electrical conductivity and other unique advantages. However, the low strength and poor wear resistance limits its application. The research progress of different methods to improve the strength, wear resistance and electrical conductivity of aluminum matrix materials was summarized comparatively. The research and application of aluminum matrix composites at home and abroad were introduced, and the development trend was prospected.关键词：Aluminum Matrix Material;Alloying;Composite;Carbonaceous Material
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发布时间：2023-12-18 - 摘要：A single SLM three-dimensional mathematical model was established using the smoothed particle hydrodynamics（SPH） method. The flow field, temperature field, surface tension and wetting action were coupled to simulate the SLM 316 L stainless steel powder. The influence of different laser power on the length and width of molten pool and the influence of surface tension on SLM process were analysed, and compared with the simulation and the experimental results of finite element simulation software. The results indicate that the length and width of the molten pool are increased with the increase of laser power, verifying that Marangoni is the driving force of SLM process.关键词：Selective Laser Melting;Smoothed Particle Hydrodynamics;Surface Tension;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Crystal plasticity finite element method（CPFEM） was adopted to investigate the transverse tensile mechanical properties of single crystal nickel-based superalloy DD6 at 760 ℃. The influence of crystal orientation and loading strain rate on the mechanical properties and deformation characteristics of DD6 alloy were analyzed as well. The results indicate that the calculated constitutive parameters can express the mechanical performance of DD6 well and elastic modulus is increased with the increase of crystal deflection angle under transverse tensile condition. A higher yield stress in the [100] and [110] orientation and a lower yield stress and better ductility in [120] orientation can be obtained due to the various activation of crystal slip system for different orientations. For the same crystal orientation, yield stress and the natural logarithm of strain rate shows a linear relationship under different strain rates.关键词：CPFEM;Nickel-based Single Crystal Alloy;Transverse Tensile;Slip System;Strain Rate
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发布时间：2023-12-18 - 摘要：The interfacial diffusion behavior and microstructure evolution of Cu/Sn/Cu diffusion couple under electric field were in-situ observed by synchrotron radiation X-ray. The growth kinetics of Cu6Sn5was in-situ investigated under absence of current, bidirectional pulse current and direct current, respectively. The results indicate that the growth of Cu6Sn5 at the Sn/Cu interface is significantly inhibited by the bidirectional pulsed electric field, which forces the precipitation of Cu6Sn5 in the Sn solder in form of plates.DC field can effectively promote the growth of Cu6Sn5in Cu/Sn/Cu diffusion pairs accidentally from anode to cathode.关键词：Synchrotron X-ray Radiography;In-situ Observation;Growth Kinetics;Electric Field Action
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发布时间：2023-12-18 - 摘要：Effects of pulsed magnetic field with different parameters on solidification structure and mechanical properties of Mg-Y-Cu-Zr-Sr alloy reinforced by long-period structure by graphite casting were explored by OM, SEM, EDS, XRD, and universal tensile testing machine. The results show that pulsed magnetic field can improve the solidification structure and mechanical properties of Mg-Y-Cu-Zr-Sr alloy effectively. When the single pulse energy is at 0～57.6 J or the pulse period is at 0.1～1 s, with the increase of single pulse energy or the decrease of pulse period, grain size in the alloy is decreased gradually, and volume fraction of the second phase is increased gradually, so mechanical properties of the alloy are increased gradually at room temperature and high temperature. When the single pulse energy is 57.6 J and the pulse period is 0.1 s, grain size in the alloy is reduced by 39%, and volume fraction of the second phase is increased by 230%, so tensile strength and elongation of the alloy at room temperature are increased by 23% and 47%, and those of ones at high temperature are increased by 29% and 99%, respectively.关键词：Pulsed Magnetic Field;Mg-Y-Cu-Zr-Sr Alloy;Solidification Structure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The hot deformation behaviors of homogenized Mn/Cr-containing aluminum alloys denoted as WQ were investigated systematically by uniaxial compression tests at various deformation temperature and strain rates. The hyperbolic-sine constitutive equation was employed to determine the parameters and activation energies of materials. Based on dynamic material model, the processing maps of WQ alloys were also constructed to reveal safe processing domain and optimize deformation parameters. Attributed to pinning effect of α-Al（MnCr）Si dispersoids, sub-grain rotation and sub-grain boundaries migration are suppressed. Hence, the softening mechanism in WQ alloy is dominated by dynamic recovery at safe processing domain. Cracks are observed in the microstructure of the machining instability zone, which is related to micro void formation, cracks and debonding of the second phase.关键词：6XXX Alloy;Hot Deformation;Constitutive Analysis;Hot Processing Map;α Dispersoids
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发布时间：2023-12-18 - 摘要：The effects of homogenization annealing on the microstructure, hardness and corrosion resistance of as-cast 7050 aluminum alloy were analyzed by optical microscope, scanning electron microscope, X-ray diffraction, differential scanning calorimeter, hardness test, polarization curve test and intergranular corrosion test. The experimental results indicate that the coarse η phases is gradually transformed into S phases and continuously dissolved in the Al matrix during homogenization annealing at 465 ℃. However, the Al7Cu2Fe phases are dissolved in the Al matrix. The over-burnt phenomenon is observed after homogenization annealing at 465 ℃ for 36 h.With the holding time increasing, the hardness of the alloy is also gradually increased to be stable, where the corrosion potential is firstly increased and then decreased, the corrosion current and intergranular corrosion depth are firstly decreased and then increased. With homogenization treatment at 465 ℃ for 24 h, the alloy exhibits desirable corrosion resistance.关键词：7050 Aluminum Alloy;Homogenization Annealing;Microstructure;Corrosion Resistance
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发布时间：2023-12-18 - 摘要：The hardness, conductivity and microstructure of as-cast and aged Cu-xCr-0.15 Zr（x=0.8～2.0） alloy were analyzed by means of hardness tester, eddy current conductivity tester, scanning electron microscope and transmission electron microscope. The results reveal that the hardness and conductivity of the aged Cu-xCr-0.15 Zr alloy are significantly higher than those of the as-cast alloy. As the Cr content increases from 0.8% to 2.0%, the hardness, tensile strength and conductivity of the aged Cu-xCr-0.15 Zr alloy are increased firstly and then decreased. When the Cr content is 1.0%, the conductivity, hardness and tensile strength reach up to 48.37 MS/m, 138 HB and 617 MPa, respectively, which is mainly related to the dispersive precipitation of nano-sized CuZr2 phase and Cu5Zr phase after solution and aging heat treatment, playing the role of second phase strengthening in Cu-xCr-0.15 Zr alloy.关键词：As-cast;As-aged;Cu-xCr-0.15Zr;Microstructure;Properties
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发布时间：2023-12-18 - 摘要：The Mg2Ni0.9Co0.1 hydrogen storage alloy was prepared by metallurgical method, and the phase composition and microstructure of the alloy were invesiagted by XRD and SEM/EDS, meanwhile the hydrogen absorption and desorption properties of the alloy were anlyzed by PCT and DSC. The results reveal that the as-cast alloy is composed of peritectic Mg2Ni phase, Mg-Mg2Ni eutectic structure and a small amount of the first precipitated Mg-Ni-Co ternary phase.The element Co can be dissolved in the Mg2Ni phase to form a Mg2（Ni, Co）solid solution phase. The alloy is transformed into Mg2NiH4 phase, Mg2Ni0.9Co0.1H4 phase and MgH2 phase after hydrogen absorption. The partial substitution of Co for Ni in the Mg2Ni significantly improves the isothermal de-/hydrogenationkinetic properties of the alloy, and the hydrogen release temperature of Mg2Ni0.9Co0.1 hydride is significantly reduced. The initial hydrogen release temperature is about 200 ℃.关键词：Mg-based Hydrogen Storage Alloys;Microstructure;Hydrogen Storage Properties
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发布时间：2023-12-18 - 摘要：Mg-4 Al-xNd（x=0, 1, 2, 3） alloy samples were prepared by permanent mold casting. The microstructures and phase compositions were analyzed by optical metallographic microscope, scanning electron microscope and X-ray diffraction. Meanwhile, the tensile properties, hardness and thermal conductivity of the alloy prepared were tested. The results reveal that as-cast microstructure of Mg-4 Al alloy is mainly composed of α-Mg and β-Mg17Al12. After adding 1% Nd, acicular and dendritic Al11Nd3 phase can be obserevd. After adding 2%～3% Nd, another granular new phase Al2Nd appears, meanwhile the amount of β-Mg17Al12 phase is decreased to completely disappear. Addition of Nd can effectively improve the mechanical properties and thermal properties of Mg-4 Al alloy. Mg-4 Al-2 Nd alloy exhibits the acceptable comprehensive performance, whose tensile strength, elongation, vickers hardness and thermal conductivity reach up to 209 MPa, 15.0% and 48.8 and 69.5 W/（m·K） at room temperature, with an increase by 9%, 30%, 6% and 13%, respectively, compared with those of Mg-4 Al alloy.关键词：Mg-4Al-xNd Cast Alloys;Microstructure;Mechanical Properties;Thermal Conductivity
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发布时间：2023-12-18 - 摘要：High quality aluminum alloy melt is the premise for producing aluminum castings with high performance. In view of the difficulty to obtain graphite impeller with small nozzles by traditional process technology, an innovative idea was proposed. By combining selective laser melting technology and graphite preparation technique, a novel porous carbon-graphite material with excellent mechanical properties and porous structure was developed. The research progress in the porous carbon-graphite material in aspects of framework preparation and synthesis method were reviewed, and the feasibility of the novel idea was demonstrated, providing reference for developing subsequent new type novel graphite impeller.关键词：Porous Carbon-graphite;Selective Laser Melting Technology;Framework;Fine Structure;Calcined Temperature
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发布时间：2023-12-18 - 摘要：3 D printing titanium alloy is suitable for manufacturing complex shape components, which can reduce production process and improve material utilization. In recent years, the application of 3 D printing additive manufacturing technology in the production of titanium alloy components achieves rapid development and significant advantages in order to obtain the more complex structure of titanium alloy components, and further reduce the cost and shorten the production cycle. The application advantages, characteristics of classification and process, status and development direction of 3 D printing technology in titanium alloy casting production were systematically introduced.关键词：3D Printing;Titanium Alloy;Casting
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发布时间：2023-12-18 - 摘要：The carbide evolution behavior of a high tungsten nickel-based superalloy during long-term aging at 1 000 ℃ was investigated by several analysis methods such as SEM, TEM and EPMA. The results indicate that primary MC carbides of the alloy are decomposed into M6C carbides, of which the amount is increased as the prolongation of thermal exposure time. When exposed for 500 h, the morphology of M6C carbides is converted from granular to blocky, and gradually transformed into rod-like after thermal exposure for 1 000 h. The morphology of M6C carbides of the alloy is dominated by the needle-like after thermal exposure for 1 500 h.关键词：Long-term Thermal Exposure;High Tungsten Ni-based Superalloy;Carbide Evolution
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发布时间：2023-12-18 - 摘要：In order to improve the mechanical and physicochemical properties of（TiC+TiB）/Ti-6 Al-4 V titanium matrix composites, electroless nickel plating was carried out on the surface of titanium matrix composites, and the microstructure evolution and properties were investigated by isothermal heat treatment at different temperatures.The results indicate that after electroless nickel plating, a variety of NiTi compounds, such as NiTi, Ni3Ti and Ti2Ni, can be formed firstly on the surface of the materials during the pre-diffusion process of（TiC+TiB）/Ti-6 Al-4 V titanium matrix composites at high temperature. The nickel element in the surface layer is mainly diffused along the phase boundary, and the morphology of matrix structure and the type of compound phase are transformed with the change of heat treatment temperature. The lamellar eutectoid structure appears in the matrix structure at 950 ℃, and the continuously increasing temperature results in the severe coarseness of structure and disappear of lamellar structure. The hardness of the specimens is first decreased and then increased with the increase of heat treatment temperature.关键词：Titanium Matrix Composite;Interface;Microstructure;Property
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发布时间：2023-12-18 - 摘要：High chromium cast iron matrix ceramic composites reinforced with ZTA ceramic particles were prepared by negative pressure casting infiltration method with Ni and Cr coating on the surface of ZTA particles. The microstructure, element distribution and phase composition of the composite were analyzed by SEM, EDS and XRD, and effects of the composites on the casting infiltration and interface bonding were analyzed. The results indicate that there exists a transition zone at the interface of the composites under negative pressure casting infiltration, which is mainly composed of Si and Na with diffusion and aggregation of Al, and contains Fe, Cr, Ni, C, O and other elements. The wettability of ceramic interface is improved by diffusion of elements, promoting the infiltration and bonding of interface. On the Ni coating condition, multiple compounds including CrNiFe, NiSi3P4, Fe2Al5, Na2NiFeF7, NaAlSiO4, Zr3NiO are generated in the transition layer of ceramic particles. Cr3O4, AlCrFe2, Na6Al4Si4O17 and other compounds are formed in the transition layer of ceramic coated with Cr. These compounds can improve the wettability of ceramics and the casting infiltration effect, promoting the combination of ceramics and high chromium cast iron.关键词：ZTA;High Chromium Cast Iron;Metal Matrix Wear-resistant Composites;Negative Pressure Casting Infiltration;Transition Layer
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发布时间：2023-12-18 - 摘要：In view of the causes of cracking on the surface and edges of high temperature ring blank in the mold ring blank casting-rolling continuous forming, the mechanical properties of 42 CrMo ring blank by vertical centrifugal casting were investigated at high temperature under different cooling rates and holding time by Geeble-3500 thermal test simulator. The results indicate that the cooling rate and holding time have less influence on the strength of the material, yet more on the plasticity. The plasticity of the material is increased with slowly cooling below 1 000 ℃, while decreased greatly at 1 200 ℃. Rapid cooling has the contrary law that plastic is increased significantly at 1 200 ℃.关键词：42CrMo Alloy;Centrifugal Casting;Ring Blank;Cooling Rate;Holding Time;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The effects of high energy electron beam remelting on the microstructure and properties of piston throat were compared under different casting processes and hydrogen content. The results show that under the same process parameters of high energy electron beam remelting, the penetration of gravity casting piston sample is greater than that of squeeze casting piston sample, and the hardness of remelting zone is lower than that of squeeze casting piston. When the hydrogen content is higher than 0.25 mL/100 g for squeeze casting samples, or the hydrogen content is higher than 0.15 mL/100 g for gravity casting samples, so there is a high probability of micro holes in the boundary of remelting zone. Under the same casting conditions, the high hydrogen content is easier to cause micro holes than the low hydrogen content, and under the same hydrogen content, the micro holes in gravity casting piston are more likely to appear than that of squeeze casting piston during remelting.关键词：Casting Process;Hydrogen Content;Piston Throat;Remelting
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发布时间：2023-12-18 - 摘要：The MAGMA software was used to simulate the temperature field of large complex ZM5 magnesium housing preapred by differential pressure casting. In order to solve the problem of casting metallurgical quality, hemisphere design in upper mold of lift pipe was designed to increase contact area between the metal liquid and the cavity during differential casting. Liquid metal can reduce the thermal shock of molding sand, which greatly reduce the volume of rolled sand for a long time, so the high quality castings can be obtained.关键词：Differential Pressure Casting;ZM5 Magnesium Alloy;Temperature Field
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发布时间：2023-12-18 - 摘要：Based on the casting structure, two casting systems were designed and simulated by ProCAST software. The filling process, solidification process and the reason and location of shrinkage were analyzed, then a optimized gating system was presented and the die casting process was optimized by adding cooling system.The result show that the defect of shrinkage is decreased obviously with optimized casting process. The actual product was produced with absence of cold shut or crack in the casting surface, meeting requirement.关键词：Flow Meter Body;Die Casting;Numerical Simulation;Process Optimization
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发布时间：2023-12-18 - 摘要：The integration of wideband feed components by investment precision casting was introduced. The internal microstructure, dimensional accuracy, electrical performance and environmental test of monolithic wideband feed products were tested, which fully meet design requirements, and have a superior consistency to the same machined products. In conclusion, the new process achieves higher efficiency and lower cost.关键词：Wideband Feed;Investment Casting;Electrical Performance
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发布时间：2023-12-18 - 摘要：In view of the investment casting process of turbine rear frame strut, the ProCAST software was adopted to simulate the filling process, cavity pressure evolution, and shrinkage cavity defects and the causes of the defects was analyzed. On this basis, the process was optimized by improving the exhaust passage, adjusting the pouring position, pouring time of the strut, and the solidification sequence of the casting, and the numerical simulation was carried out. The results indicate that the filling process of the optimized process is stable without “suffocation” phenomenon in the cavity and shrinkage and cavity defect in the strut. The actual casting verification demonstrates that the casting quality meets the ASTM E192 standard.关键词：Turbine Rear Frame Strut;Investment Casting;Numerical Simulation
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发布时间：2023-12-18 - 摘要：<正>各相关单位:中国铸造协会将在"2021中国国际压铸高层论坛暨第三届压铸CEO峰会期间"举办著名压铸专家答疑活动,时间安排在10月2 6日上午。我们邀请到如下专家与会答疑:压铸工艺专家:邢敏儒张庆成吴新陆压铸设备专家:卢宏远压铸模具专家:赵海东陈九戬挤压铸造专家:罗继相半固态铸造专家:李大全现面向全行业征集压铸生产技术难题。请有需要的企业或个人填写附件中的登记表,并于2021年10月1 5日前反馈给大会组委会。
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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 - 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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