最新刊期
卷 42 ， 期 2 ， 2022
- 摘要：<正>1、会议主办单位中国机械工程学会铸造分会中国兵工学会材料科学与技术专业委员会中国机械工程学会塑性工程分会《特种铸造及有色合金》杂志社（武汉）2、会议承办单位《特种铸造及有色合金》杂志社（武汉）3、会议地点待定4、会议时间2022年秋季（11月前后,具体时间待定）5、征文内容
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发布时间：2023-12-18 - 摘要：Through dispersing graphene by ultrasonic dispersion and mechanical stirring, graphene reinforced aluminum matrix composites were prepared by spark plasma sintering. Effects of graphene sheet diameter on the microstructure and properties of the aluminum matrix composites were analyzed. The results indicate that the copper particles on the surface of copper plated graphene are diffused into the aluminum matrix, strengthening the interface bonding between graphene and aluminum, leading to the better bonding between graphene with larger sheet diameter and aluminum matrix. The tensile strength of the composites reinforced by graphene with different sheet diameters is similar, and graphene with larger sheet diameter is contributed to achieving the better balance of strength and plasticity, which however, has better enhancement effect on the conductivity of the composite, while graphene with two different sheet diameters has no obvious enhancement effect on the thermal conductivity of the composite. Graphene with larger sheet diameter has better effect on the comprehensive properties of the aluminum matrix composites.关键词：Aluminum Matrix Composites;Graphene;Surface Modification;Interface Characteristics;Performance
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发布时间：2023-12-18 - 摘要：The trade-off relationship between strength and plasticity（toughness） of titanium alloys seriously limits its further improvement and wide application. Heterogeneous titanium alloys can simultaneously improve the strength and plasticity（toughness） of conventional titanium alloys, which provides an important research and development direction to obtain titanium alloys with extraordinary strength and ductility. The microstructure, mechanical behavior characteristics and strengthening-toughening mechanism of heterogeneous titanium alloys were reviewed. Based on the current research status and shortcomings, future development trends and research directions of heterogeneous titanium alloys were put forward.关键词：Heterogeneous Titanium Alloys;Microstructure;Mechanical Properties;Strengthening-toughening Mechanism
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发布时间：2023-12-18 - 摘要：<正>万丰奥威在接受调研时表示，公司的汽车金属部件轻量化产业已形成“镁合金、铝合金、高强度钢”等金属材料轻量化应用为主线的汽车部件细分龙头领先地位。万丰奥威于2015年收购了镁·瑞丁，后者是全球汽车市场的镁合金压铸零部件龙头供应商。镁·瑞丁的压铸设备以高压压铸为主，涵盖大、中、小吨位，其中大吨位设备占比60%以上。在镁合金应用开发方面，镁·瑞丁率先在北美区实现变速箱分动器及分动箱壳体和壳盖的镁合金压铸；
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发布时间：2023-12-18 - 摘要：<正>根据海关数据显示，2021年1～12月中国铝箔出口量133.5万t，同比增长7.73%，出口量超过此前2019年的最高值129.5万t，创历史最高水平。全年铝箔出口额51.42亿美元，同比增长34.2%，同创历史新高，此前最高水平是2018年的43.04亿美元。2021年铝箔出口额占中国铝产品出口额的14.8%。这一成绩是在中国经济增速下降，市场有效需求不振，疫情及自然灾害频发，铝锭等原材料大幅上涨，能耗双控，
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发布时间：2023-12-18 - 摘要：<正>2022年1月22日，“广东鸿图科技股份有限公司（简称“广东鸿图”）6 800T底盘一体化结构件下线暨12 000T超级智能压铸单元合作签约仪式”，在广东肇庆市高要区广东鸿图科技园隆重举行。广东鸿图6 800T压铸单元已于近日（1月17日）成功试模。此次汽车底盘一体化结构件下线，标志着该超大型压铸单元正式投产。活动现场，广东鸿图、力劲集团、型腔模具、鸿劲铝业等四方，就12 000T超级压铸单元研发项目举行了签约仪式。
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发布时间：2023-12-18 - 摘要：<正>2021年，在芯片短缺、原材料价格高涨以及疫情反复等诸多不利因素的影响下，我国汽车产业力排众难，不但以2 608.2万辆和2 627.5万辆的产销总量，连续13年稳居全球之首；还以3.4%和3.8%的同比增长率，结束了自2018年以来产销连续三年下降的局面。剖析各细分市场全年的销量表现可知，乘用车特别是新能源乘用车是推动我国2021年汽车整体产销逆势增长的重要阵地。数据显示，2021年，乘用车产销分别完成2 140.8万辆和2 148.2万辆，同比分别增长7.1%和6.5%,
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发布时间：2023-12-18 - 摘要：<正>随着中国经济社会发展的转变和产业结构的提升,社会上对技术应用类人才的需求量也日益增大,而高校,特别是高等院校冶金铸造专业肩负人才培养的重大任务。然而,近年来高等院校冶金铸造专业学生的就业情况却不容乐观,“就业难”的问题更加突出。经过总结经验,发现作为培育技术应用类人才的主阵地,高等院校冶金铸造专业在集中培训具备专业技能人员的时候,却忽视了对冶金铸造专业学生职业素质与职业精神的培养,最后使得培养的冶金铸造专业学生往往达不到公司的用人条件,出现了冶金铸造专业学生找不到工作,
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发布时间：2023-12-18 - 摘要：<正>随着计算机技术在智能设备中的逐步应用,越来越多的计算机基础技术和服务将通过云等网络向应用者提供所需服务,这些智能设备之间经过有机的结合有效地推动了所应用产业的进步与发展。现阶段,技术的进步与科技的发展推动着工业的进步与发展,且工业正在由3.0阶段向工业4.0阶段迈进。在第四代工业革命中,物联网服务的出现使得为整个制造过程创造网络化的资源和服务成为可能,从而产生了智能工厂和未来工厂等现代化制造产业,世界也逐步全面进入第四次工业化进程。
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发布时间：2023-12-18 - 摘要：<正>金属工艺在现代科技下高速发展,金属材料也十分发达:金、银、铜、铁、铝、锰、锌、锡、铬等,也包括由两个以上的金属单质或金属元素与非合金元素组合而成的合金,使其拥有优异的光滑度、延伸性、导磁性、导热性等,让时尚的产品也更加丰富多彩。起初,合金材料最早是使用在具有高度象征意义和观赏性的艺术品,但后来也逐渐使用在人类的日常生活用品和环境中。而在现代艺术设计中里,身为一类建筑材料,合金在百花齐放的建筑设计技术领域中有着重要的优势。
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发布时间：2023-12-18 - 摘要：<正>随着全球各国商品贸易联系的加强,对铸造出口型企业产品专业术语翻译的需求也越来越广泛,不仅在产品专业术语英译理念上需要全面更新,对于铸造产品专业术语英译方面的内容表达、语意指向、语义联系也需要树立科学的认识,以科学的英译理念为指导,以有效的英译方法为依托,从铸造企业产品出口的专业需求角度出发,在商务交流、会议组织、外贸谈判等多种商业场景中做好铸造企业产品专业术语翻译工作。伴随铸造企业产品出口需求增大,
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发布时间：2023-12-18 - 摘要：<正>现阶段,经济全球化发展的速度逐渐加快,世界的经济发展状态逐渐由过去的独立发展转向为一体化发展,这一方面提高了世界上发达国家发展水平与建设质量,另一方面有效带动了发展中国家的经济变革步伐。在这种世界发展背景下,来自不同国家和地区且有着不同语言的全球各国人民需要进行充分的交流与合作,以紧跟世界的发展潮流。在此过程中,英语作为一门通用性语言,担负了世界各地人民之间交流与沟通桥梁的重要作用。
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发布时间：2023-12-18 - 摘要：<正>在充满机会和挑战的新时代,铸造行业企业为谋求开拓经营成长之道往往偏向传媒而忽视了音乐教育对铸造行业企业发展的深远影响。企业若要占领发展的制高点,就必须注重企业与音乐教育之间的联系,重视铸造行业企业与音乐教育所产生的无限魅力与发展空间。一、铸造行业企业发展呼唤与之相适应的音乐教育就中国目前音乐教育在企业发展中的基本状况来看,从质量和服务的大方向上都应该尽量满足社会主义市场经济的快速发展,“缺少社会文化滋润的企业始终长不成参天大树”。
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发布时间：2023-12-18 - 摘要：<正>随着改革开放不断深化发展,国与国之间交流和学习越来越密切,机械铸造行业的发展也有了巨大的飞跃,我国加快脚步向世界各国学习先进技术,国外机械制造设备和机械铸造技术被我们学习和引用,这也对机械铸造行业的专业英语提出了更高的要求。因此,机械铸造专业英语的汉译英策略研究也起到了举足轻重的作用。机械铸造英语是专业英语的一部分,不仅具有英语本身的语言知识体系,还有独立语言特征。探讨了机械铸造专业英语的语言特点,并结合实际案例,探究了其汉译英研究策略。
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发布时间：2023-12-18 - 摘要：<正>铸造业是我国工业社会中的基础性行业,其在国家的发展、城市的建设与社会的进步中具有极为重要的作用,且随着科技水平的不断提升与生产制造能力的不断加强,铸造业自身在近几十年的发展中发生了翻天覆地的变化。现阶段,铸造行业已经同过去的劳动密集型产业中脱胎换骨,转向于大力发展自动化、智能化和信息化的生产模式,这样一方面提高了铸造业的实际生产效能,另一方面也全面改善了人们对铸造业的传统认识。
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发布时间：2023-12-18 - 摘要：Die-casting heat-resistant magnesium alloys have great potential in weight-saving of automobile. Firstly, strengthening mechanisms and plastic deformation mechanisms of die-casting magnesium alloys at high temperature were described. Combining with the characteristics of die-casting heat-resistant magnesium alloys, effective ways to improve strength and ductility were analyzed. Then, current research progress in die-casting heat-resistant magnesium alloys was summarized from the aspects of alloy composition development, high-temperature performance, microstructure and failure cause. Finally, combining with the demand of casting properties and mechanical behavior, the research directions and perspectives were pointed out.关键词：Heat-resistant Mg Alloy;Die Casting;Strengthening Mechanism;Mg-Al;Mg-RE
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发布时间：2023-12-18 - 摘要：Due to the excellent high temperature performance and corrosion resistance, Ni3Al precipitation strengthening superalloys become the most commonly used engineering material in aerospace and energy industry. After the development in decades, Ni3Al precipitation strengthening superalloys were evolved from the poly crystal to the single crystal, and the ability to withstand high temperature was continuously enhanced. The mechanical properties of Ni3Al precipitation strengthening superalloys mainly depend on the microstructural characteristics of alloying elements, precipitates, and grain constitute, and improvement of the microstructure is an effective way to raise performances of the alloy. The research progress in electron beam welding on Ni3Al precipitation strengthening superalloys was briefly introduced from the aspects of macro-forming, microstructure and mechanical properties, and prospects were also expounded.关键词：Superalloys;Microstructure;Mechanical Properties;Electron Beam Welding
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发布时间：2023-12-18 - 摘要：In order to further promote the riser process optimization, three-dimensional feed path calculation of steel casting was focused in view of deficiencies of traditional methods in the riser optimization design. The feed path computation method of steel casting based on time gradient was clarified, and two steel casting models were set as examples to verify the validity and applicability.关键词：Riser Optimization;Feed Path;Time Gradient;Steel Casting
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发布时间：2023-12-18 - 摘要：TC4 titanium alloy fabricated by the electron beam additive manufacturing were welded by electron beam welding, and the microstructure and mechanical properties of the joints were analyzed. The results reveal that the microstructure of the base metal zone is composed of basket-wave shaped α+β phase, and the heat affected zone is composed of β-transformed structure and α′martensite. With closer to the weld joint, the martensite content is increased. A large number of elongated α′martensite exists in the weld zone, and the martensite is finer from the top to the bottom of the weld. The hardness of the base metal zone is the lowest, while the weld zone is the highest, and that of the heat-affected zone is increased significantly with the decrease of the distance from the center line of the weld. Joints are broken on the side of the base material, where the ultimate tensile strength and the elongation of the joint is 875 MPa and 7%, respectively, and the fracture type is characterized by ductile fracture.关键词：Titanium Alloy;Electron Beam Additive Manufacturing;Electron Beam Welding;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The preparation of particle-reinforced aluminum matrix composites by stirring casting method has the advantages of short process and low cost. However, problems such as poor forming, pores, inclusions, and uneven distribution of reinforcement particles existing in the casting process make it difficult to fabricate large complex components. The electromagnetic stirring suction casting technology was proposed to solve the above problems. Compared with traditional gravity casting, the technology can simultaneously realize electromagnetic stirring and suction casting, avoiding the sedimentation of reinforcement particles during the casting process. Suction casting method can relieve poor melt fluidity, greatly increasing the filling speed and cooling uniformity. 20 SiCp/A357 composites was used as raw material, and electromagnetic stirring suction casting technology was adopted to successfully prepare a 40 kg aluminum-based composite shaft-mounted brake disc for rail transit. Compared with gravity casting, electromagnetic stirring suction casting technology can significantly improve the macroscopic and microstructure uniformity, density and mechanical properties of the brake disc, obtaining high-quality large-scale complex components of aluminum matrix composites.关键词：Aluminum Matrix Composite;Electromagnetic Stirring Suction Casting;Large Complex Components;Uniformity;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The 10 W-30 B4C/60 Al composite shielding material was prepared by high energy ball milling, pressing forming and vacuum sintering process. The effects of sintering temperature on microstructure, physical properties and shielding properties of W-Al-B4C composites were investigated systematically. The results indicate that with the sintering temperature of 530～630 ℃, the uniformity, density and compactness of 10 W-30 B4C/60 Al composite particles are increased firstly and then decreased with the increase of sintering temperature, while the porosity is decreased firstly and then increased. The increase of sintering temperature can also improve the shielding properties of neutron and γ ray in the composite, which, however, is decreased with the increase of sintering temperature when reaching a certain value. When the sintering temperature is 600 ℃, the performance of 10 W-30 B4C/60 Al composite is desirable, and the microstructure is uniform and compact, where the density and compactnessreach the maximum value of 1.836 g/cm3 and 62.3%, respectively, and the attenuation coefficient also reaches the maximum value of 0.121.关键词：W-Al-B4C Composites;Sintering Temperature;Relative Density;Shielding Performance
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发布时间：2023-12-18 - 摘要：Nickel alloying 7075 aluminum alloy exhibits superior thermal cracking resistance. In order to explore the heat treatment regulation technology of the as-cast alloys, the influence of heat treatment conditions on the microstructure and mechanical properties of the 7075 alloys were investigated comparatively. The results reveal that the solidification microstructure of the alloys is mainly composed of primary α-Al phase and intergranular multi-phase divorced eutectic microstructure. The intergranular Al-Cu-Mg intermetallic compounds are completely dissolved into the matrix alloy after solid solution aging, where the coarse Al3Ni intermetallic compound in the as-cast specimens is also refined with dispersed distribution. After heat treatment, the comprehensive mechanical properties of the specimens are significantly improved, where the average tensile strength of 7075 aluminum alloy with 0.6% Ni content is 14% and 17%, higher than that of 7075 alloy and 7075 aluminum alloy with 1.2% Ni content, respectively, indicating that the microstructural control of intergranular compounds is the key factor to improving the tensile strength of the alloy.关键词：7075 Aluminum Alloy;Al3Ni Phase;Solidification Structure;Heat Treatment;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Ti-Al alloys with different Al contents were fabricated by mechanical alloying and spark plasma sintering（MA-SPS）. The effects of Al content on the composite powder morphologies, microstructure and electrical resistivity of SPS Ti-Al alloys were investigated. The results indicate that Ti-Al composite powders are flattened during high energy ball milling with Al dissolved into Ti. When the content of Al is higher than 9%, part of Al is dissolved into Ti, while the insoluble Al is broken into fine particles and attached to the surface of Ti particles, resulting in the increase of surface roughness, where the cross section of particles presents a layered structure. When the amount of Al is 6%, the microstructure of SPS specimen prepared by ball milled powders is single-phase α-Ti（Al） solid solution, which becomes α-Ti（Al） phase and fine α2 particles precipitated in grain boundary when the amount of Al is 9%～12%. When the amount of Al exceeds 12%, the microstructure is dual-phase composed of α-Ti（Al） and α2-Ti3Al. The electrical resistivity of the alloys is firstly increased and then decreased with the increase of Al content, and slightly increased when the amount of Al reaches 18%.The electrical resistivity reaches the maximum value of 2.074 μΩ·m when the Al content is 9%.关键词：Ti-Al Alloy;Mechanical Alloying;Spark Plasma Sintering;Microstructure;Electrical Resistivity
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发布时间：2023-12-18 - 摘要：Taking QAl10-4-4 aluminum bronze material as the research object, the high temperature friction and wear tester（MG-2000） pin-plate of simulation experiment was conducted according to the QAl10-4-4 aluminum bronze joint bearing processing way to design heat treatment process. The box-Behnken response surface test scheme was adopted to establish a regression model between the three operating conditions of rotating speed, load or temperature and the friction coefficient or wear amount. The influence sequence of process parameters on the friction and wear characteristics of QAl10-4-4 aluminum bronze were explored to obtain the optimal operating conditions of the sliding joint bearing. The results indicate that the influence order of three operating parameters on friction coefficient is: speed>load>temperature, and the interaction between the speed and the load has a significant influence on the friction coefficient. The influence order on wear is: load>speed>temperature, and the interaction between speed and temperature has a significant impact on wear quantity. The optimal parameters for QAl10-4-4 aluminum bronze joint bearing are presented as follows: the speed of 150 r/min, the load of 108 N, temperature of 100 ℃, where the QAl10-4-4 aluminum bronze of the friction coefficient is 0.049, and the wear quantity is 0.017 3 g.关键词：Pin-disk Test;Friction Wear;QAl10-4-4 Aluminum Bronze;Response Surface
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发布时间：2023-12-18 - 摘要：The influences of Y element on the microstructure and mechanical properties of Mg-4 Sm-0.6 Zn-0.5 Zr alloy were investigated. The Mg-4 Sm-xY-0.6 Zn-0.5 Zr alloy is mainly composed of α-Mg matrix, Mg24Y5 phase,（Mg, Zn）3（Y,Sm） phase, and Mg12YZn phase with LPSO structure. With the increase of Y content, the grains are gradually refined and the amount of eutectic phases at the grain boundary is increased. There exists a eutectic secondary LPSO phase Mg12YZn at the grain boundary. The LPSO phase Mg12YZn is coherent with the α-Mg matrix, which improves the strength and hardness of the magnesium alloy.With the increase of Y content, the mechanical properties of Mg-4 Sm-0.6 Zn-0.5 Zr alloy is improved continously. With the Y content of 6.89%, the hardness, yield strength, tensile strength and elongation of the as-cast Mg-4 Sm-7 Y-0.6 Zn-0.5 Zr alloy reach up to 95.6 HV, 118 MPa, 193 MPa, 10.5%, respectively. The structure of LPSO has an effect on the fracture behavior of magnesium alloy. The fracture mechanism of Mg-4 Sm-7 Y-0.6 Zn-0.5 Zr alloy is characterized by cleavage brittle fracture, and the fracture and crack depth gradually become shallower.关键词：Y Element;Rare Earth Magnesium Alloy;Mechanical Properties;Microstructure;LPSO Phase
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发布时间：2023-12-18 - 摘要：The effects of Al content on the microstructure and mechanical properties of Cr5 Mo1 V die steel were investigated by means of optical microscope, scanning electron microscope, transmission electron microscope and X-ray diffractometer, and the action mechanism of Al element was analyzed. The results indicate that the main phases of as-cast Cr5 Mo1 V-xAl die steel are composed of α-Fe, γ-Fe and M7C3 carbide, and the area fraction of pearlite in the die steel is firstly increased and then decreased with the increase of Al content. As the Al content increases to 1.2%, the pearlite appears in the die steel. Lath martensite and secondary carbide can be observed in tempered Cr5 Mo1 V die steel without Al addition. When Al content is 1.2% or 1.5%, local fine twins and coarse carbides are generated. With the increase of Al content in tempered Cr5 Mo1 V-xAl die steel from 0 to 1.5%, the tensile strength, elongation, impact toughness and hardness of die steel are firstly increased and then decreased with the appropriate Al content of 1.2%, which is mainly attributed to the formation of nano twins, major secondary carbides and dispersed distribution of δ-Fe phase in die steel.关键词：Cr5Mo1V Die Steel;Al Content;Tempered State;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：CeO2 and Al-7 Si-Mg alloy powders were used as raw materials to prepare Al-Si composites with different volume fractions of CeO2 by powder metallurgy method. The effects of CeO2 content on the microstructure and properties of Al-7 Si-Mg alloy were investigated. The results show that the addition of appropriate amount of CeO2 can significantly refine Si phase and improve the distribution uniformity of Si particles in Al-Si alloy. With the addition of CeO2, the hardness and tensile properties of Al-Si alloy are improved. When the content of CeO2 is 0.2%, the size of Si phase in Al-Si alloy is the smallest and the distribution uniformity is desirable, where the mechanical properties of Al-Si alloy also reach the peak, which are 60.8 HV0.1, 141.406 MPa and 9.49%, respectively.关键词：CeO2 Content;Powder Metallurgy;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The eutectic growth behavior of unmodified and Sr modified Al-7 Si alloy was investigated. The eutectic Si in unmodified Al-7 Si alloy presents different morphologies with the increase of growth speed of directional solidification. At low growth speed of 2 μm/s, the flat plate eutectic Si sharing a center is interweaved into “star” morphology, and the lamellar eutectic Si has a “Wheatsheaf” morphology when the growth speed increased to a medium speed of 20 μm/s, while the quenched fibrous eutectic Si has a “Coral” morphology at high quenched speed. The different morphologies of eutectic Si at different growth speeds correspond to different growth and branching mechanisms. The Sr modified refined eutectic Si has a “Coral” morphology, which could be attributed to the synergy of the“Impurity-induced twinning mechanism”and the transition of {111}Si plane from smooth growth to rough growth.关键词：Al-7Si Alloy;Directional Solidification;Eutectic Silicon Morphology;Growth
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发布时间：2023-12-18 - 摘要：The hot tearing susceptibility（HTS） of Al-Zn-Mg-Cu alloy semi-solid rheo-die castings was evaluated by the semi-quantitative evaluation method. The fracture morphology and the distribution of cross-section pores were analyzed under different intensification pressures. The results reveal that the HTS of the alloy is decreased firstly and then increased with the increase of intensification pressure, and presents the smallest HTS value of 15 when the intensification pressure is 87 MPa. With 94 MPa, the HTS has the highest value of 27. The pores inside the samples have a strong influence on hot tearing, which is the origination of the hot tearing initiation. The intergranular separation caused by insufficient shrinkage during solidification is the main cause of pores, and the porosity of castings can be effectively reduced by increasing intensification pressures. However, the higher intensification pressure will exert an impact on the solidifying casting, leading to crack and increase of hot tearing.关键词：Al-Zn-Mg-Cu Alloy;Rheo-die Casting;Intensification Pressure;Hot Tearing
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发布时间：2023-12-18 - 摘要：Considering the surface of aluminum alloy disk substrate is locally concentrated and symmetrical after chemical mechanical polishing（CMP） with tiny concave defects in range of 1～3 μm, scanning electron microscope（SEM）, focused ion beam microscope（FIB） and surface profile were utilized to analyze the microstructure and cross section of specimens. Combined with the production process of aluminum substrate and electroless nickel-plating process, the evolution of surface morphology in various processes as well as the mechanism was investigated. The results indicate that serious corrosion occurs around the intermetallic compound（IMC） area on the surface of the aluminum substrate during the cleaning process, due to the uneven concentration distribution of the detergent, whereas low-concentration inhibitor is highly corrosive, resulting in a large number of pits. After electroless nickel plating, concaves are generated on the pit location of the nickel layer, which can not be completely removed during the polishing process, and finally leads to pitting defects on the surface of the product. By adding the automatic overflow stirring device, the heterogeneous distribution of cleaning agent concentration is eliminated, effectively avoiding the abnormal uneven corrosion.关键词：Aluminum Alloy;Intermetallic Compound;Pitting;Corrosion Inhibitor
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发布时间：2023-12-18 - 摘要：The high temperature deformation behavior and microstructure evolution of TC6 titanium alloy were investigated by Thermocmastor-Z100 kN thermal simulation testing machine under the conditions of deformation temperature of 900～945 ℃, strain rate of 0.000 1～0.1 s-1, and deformation amount of 70%.The results indicate that with increasing in the deformation temperature, the transformation from primary α phase to β phase is more completed, and the strain rate has little effect on the content of primary α-phase. At low strain rate of 0.000 1 s-1 and different deformation temperature conditions, the material fully undergoes dynamic recovery due to the overlongdeformation, which causes to grow and coarsen of the grain. The TC6 titanium alloy undergoes continuous dynamic recrystallization at a lower strain rate of 0.000 1～0.01 s-1, while discontinuous dynamic recrystallization occurs at the strain rate of 0.1 s-1.In conclusion, the thermal deformation process parameters suitable for TC6 titanium alloy are presented as follows: deformation temperature of 915～945 ℃ and strain rate of 0.001～0.1 s-1.关键词：TC6 Titanium Alloy;High Temperature Deformation;Low Strain Rate;Dynamic Recrystallization;Microstructure
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发布时间：2023-12-18 - 摘要：The Gleeble-3500 thermal simulation compressor was applied to conduct isothermal and constant strain rate thermal simulation compression tests, and the thermal deformation behavior of TC21 titanium alloy was investigated at deformation temperature of 870～990 ℃ and strain rate of 0.001～10 s-1. The results indicate that at the strain rate of 0.1 s-1, the increase of deformation temperature promotes the dynamic recrystallization, and the α phase grains in the microstructure are gradually elongated and broken, refining the grain size. When the deformation temperature is 870 ℃ and the strain rate is 0.01 s-1, the α phase grains in the microstructure are finer with more uniformly. Through the analysis and calculation of the thermal simulation experimental data, the deformation activation energy Q of TC21 alloy was obtained, and the flow stress constitutive equation and recrystallization kinetic model under high temperature condition were established. Finally, the error analysis of the recrystallization kinetics model was performed, verifying the accuracy of the model.关键词：TC21 Titanium Alloy;Dynamic Recrystallization;Constitutive Equation
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发布时间：2023-12-18 - 摘要：The design scheme of low-pressure casting aluminum alloy wheel was carried out to improve the metal utilization rate, such as the lipless rim structure for the inner rim of the wheel, the double-layer weight reduction nest for the back cavity of the spoke, and the open weight reduction nest for the wheel center. The example analysis and actual production verification show that the design scheme can effectively improve the metal utilization rate of aluminum alloy wheel and reduce the production cost.关键词：Aluminum Alloy Wheel;Metal Utilization;Double Deck Weight Reduction
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发布时间：2023-12-18 - 摘要：Zn-15 Al semi-solid solder was prepared and brazing experiment of Cu/Al tube was carried out by magnetic pulse assisted semi-solid brazing. The shear rheological behavior of solder during brazing process was analyzed based on LS-DYNA, and the relationship between shear rate and initial nucleation density was established combined with microstructure analysis of the joint. The nucleation model was coupled to the subsequent cooling process, and the solidification behavior of the brazing joint microstructure in the semi-solid brazing process assisted by magnetic pulse was simulated and analyzed by ProCAST software. The effects of the brazing temperature and shear rate on the solidification microstructure were analyzed. The results indicate that the grain size is increased obviously with the increase of brazing temperature. As the shear rate increases, the nucleation density is raised, and the number of grains grows while the grain size is decreased. When the brazing temperature is 410 ℃, desirable microstructure of the brazing joint can be obtained, and the grains become round and smaller.关键词：Zn-15Al Solder;Magnetic Pulse;Semi-solid;Solidification Microstructure
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发布时间：2023-12-18 - 摘要：Based on the working principle of mechanical vacuum valve, combined with the quality and performance requirements of aluminum alloy die casting, different vacuum extraction processes were developed and tested, and the correlation between the internal quality of aluminum alloy die casting and vacuum process was analyzed by X-ray detection method. In addition, the influence of mechanical vacuum valve failure on the product was expounded.关键词：Vacuum Valve;Vacuum Process;Aluminum Alloy Die Castings;Internal Defects
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发布时间：2023-12-18 - 摘要：The effects of different heat treatment conditions on the mechanical properties of aluminum alloy AlSi10 MnMg structural parts were investigated under high vacuum die-casting. The contribution of various factors on mechanical properties in the heat treatment process was analyzed. The results show that the mechanical properties of the parts at different positions are different on the same heat treatment conditions, and the mechanical properties of the parts near the inner gate are superior to those at the end position. After T6 heat treatment, a lower solution temperature and a longer artificial aging time contribute to desirable properties. In addition, a small amount of pores still exist in the high vacuum die castings, and shrinkage and cavities are also found in the thick areas of the castings.关键词：Aluminium Alloy;Shock Tower;Structural Parts;High Vacuum Die Casting;T6 Heat Treatment
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发布时间：2023-12-18 - 摘要：The shrinkage porosities in elbow joint parts formed by empirical investment casting generally exists on the inner wall of hole and base ring. The ProCAST simulation software was utilized to analyze the defects of elbow joint castings. With the optimization of gating system and the addition of riser and cold iron, two schemes for reducing the shrinkage rate were proposed. The comparative analysis reveals that the optimization of gating system is the optimal scheme and the orthogonal test is designed. The results indicate that when the pouring temperature is 1 520 ℃, pouring speed is 0.6 kg/s and shell preheating temperature is 1 120 ℃, the maximum shrinkage rate is 1.44%, effectively improving the quality of the product.关键词：Investment Casting;ProCAST Software;Elbow Joint;Process Optimization
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发布时间：2023-12-18 - 摘要：Aiming at the complex structure of a certain type of engine pump and high working strength and poor uniformity of wall thickness of manually prepared shell during the investment casting, the process design and application verification of the automatic shell-making by manipulator were carried out for the dip-coating and stuccoing of the shells based on the structural characteristics of the pump. The results indicate that the wall thickness difference of the shell-making by the manipulator is reduced from 124% to 13% compared to the manual one, with human costs reduced significantly.关键词：Pump;Ceramic Shell;Automatic Shell-making;Investment Casting
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发布时间：2023-12-18 - 摘要：Comparing to slurry prepared ordinary 830 silica sol and the production of castings, SKP27-3 surface layer silica sol has higher stability, excellent coating properties and insensitivity to drying conditions, of which the performance and effect. After verification of batch production of castings, the stability of slurry prepared with SKP27-3 surface layer silica sol reach up to 62 days. The cavity surface of the prepared shell is smooth and dense, and the one-time yield rate is greatly improved. The statistical defect rate of batch production casting is below 4.45%, and the casting repair rate is greatly reduced, while the casting defect rate of 830 silica sol is higher than 11.72%, indicating that SKP27-3 surface layer silica sol has a high advantage.关键词：SKP27-3 Silica Sol;Surface Enhancement;Paintability;Stability
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发布时间：2023-12-18 - 摘要：Due to the large element segregation and low thermal conductivity in cast low alloy steel, serious cracks is easily formed. In order to eliminated the defects of hot crack and shrinkage porosity, ProCAST software was used to simulate the solidification process. The pouring system was modified and verified to eliminate the defects. The results indicate that the lower Niyama value and longer solidification duration are prone to form shrinkage cavity and crack defects. Therefore, the casting defect location can be determined accurately by combination of solidification time and Niyama criterion.关键词：Cast Low Alloy Steel;Investment Casting;Hot Crack;Solidification Time;Niyama Criterion
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发布时间：2023-12-18 - 摘要：<正>根据苏压协[2022]01号通知,协会年会暨中外压铸技术交流会因疫情暂缓召开,具体召开时间另行通知,为此,同步举行的论坛征文活动,调整为3月10日截止收稿。请各位投稿的行业人士抓紧时间将文章整理好,发送至协会秘书处。具体如下:会议时间:待定会议地点:待定主办单位:苏州市压铸技术协会协办单位:中国兵工学会挤压铸造专业委员会、中国铸造协会压铸分会、中国铸造协会挤压铸造专业委员会、香港铸造业总会、上海市压铸技术协会、宁波市铸造行业协会
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发布时间：2023-12-18
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