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Numerical Simulation of Magnetic Field Distribution in Aluminum Melting Furnace With Electromagnetic Stirring

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Journal of Iron and Steel Research International 2012年第S1期19卷 179-182页

作者： CHEN Hong WU Li WANG Tong-min cao zhi-qiang LI Ting-ju School of Materials Science and Engineering Dalian University of Technology

In metallurgical processing,effective and reliable electromagnetic stirring of the melt is one of the prerequisites for higher productivity and improved process *** structure and electrical parameters of the stirrer are greatly significant on improving and enhancing the stirring *** this paper,ANSYS software is used to research the effect of stirrer parameters on magnetic field distribution in aluminum melting *** results show that magnetic flux density distributes as two humps at the direction(X)of metal *** flux density distributes as a hump at the direction(Z)of metal width,reaches its maximum at the pool center and decays gradually toward the *** is also demonstrated that magnetic flux density increases by 2.65mT,as kilo-ampere-turns increase by *** center distance between two coils changes the distribution of magnetic flux density rather than its magnitude,while the distance from coils to the bottom of molten aluminum changes the magnitude of magnetic flux density but no change of distribution.

关键词： numerical simulation electromagnetic stirring aluminum melting furnace

Microstructure Evolution of Hypoeutectic Al-Si Alloy With Electromagnetic Stirring and Ultrasonic Treatment

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Journal of Iron and Steel Research International 2012年第S1期19卷 212-216页

作者： ZHANG Yu-bo FU Ying WANG Tong-min cao zhi-qiang LI Ting-ju School of Materials Science and Engineering Dalian University of Technology

Effects of electromagnetic stirring(EMS),ultrasonic treatment(UST)and the combination of EMS and UST(EU)on solidification structure were investigated in hypoeutectic A1-Si *** results indicate that EMS,UST and EU can refine primary u-A1 and modify eutectic silicon by influencing their nucleation and growth *** can fracture the dendrite arms and lead to decrease of primary α-Al grain *** also changes the morphology of eutectic silicon and widens the separation of silicon *** UST,the cavitation and acoustic streaming are the principal reasons for the microstructure refinement,which enhance the undercooled and heterogeneous *** has combined the features of EMS and UST,hence obtains the best effect on the microstructure *** refinement of primary α-Al and evident modification of eutectic silicon are observed with *** addition,the mechanism of morphological evolution with EU was preliminarily discussed.

关键词： electromagnetic stirring ultrasonic treatment Al-Si alloy microstructure

In-Situ Observation of Dendrite Growth During Solidification of Al-10wt.%Cu Alloy Under Pulsed Magnetic Field

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Journal of Iron and Steel Research International 2012年第S1期19卷 229-232页

作者： cao Fei ZHU Jing WANG Tong-min FU Ya-nan XIE Hong-lan cao zhi-qiang LI Ting-ju School of Materials Science and Engineering Dalian University of Technology Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics

Time-resolved X-ray imaging with intense,high brightness and monochromatic third-generation synchrotron radiation,and a high-resolution fast-readout charge coupled device(CCD)system have been used to in-situ observe the dendrite growth of a solidifying Al-10wt.%Cu alloy under pulsed magnetic *** imaging results indicate that the secondary dendrite tip growth underwent a rapid deceleration once the pulsed magnetic field was *** remelting phenomenon of small dendrites was also observed when applying the pulsed magnetic field at the beginning of *** is related to the Joule heat effect caused by the imposed pulsed magnetic ***,fragmentation of the dendrites usually caused by the forced convection induced by pulsed magnetic field was not found in the present work.

关键词： synchrotron radiation aluminum alloy solidification pulsed magnetic field

Modification of Solidification Structure Under DC Pulse Magnetic Field

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Journal of Iron and Steel Research International 2012年第S1期19卷 226-228页

作者： FU Ying Park Joonpyo WANG Tong-min Kim Jongho cao zhi-qiang LI Ting-Ju School of Materials Science and Engineering Dalian University of Technology Research Institute of Industrial Science and Technology(RIST) Pohang 790-600Korea

A new process using direct current pulsed magnetic field for modification of solidification structure of pure aluminium has been *** experimental results show that the fine equiaxed crystal zone exists at the bottom o... 详细信息

关键词： DC-Pulsed magnetic field pure aluminum grain refinement

Preparation of 3003/4045 Cladding Hollow Billets by Horizontal Electromagnetic Continuous Casting

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Journal of Iron and Steel Research International 2012年第S2期19卷 896-899页

作者： LIU Ning ZHANG Peng-chao JIE Jin-chuan cao zhi-qiang WANG Tong-min LI Ting-ju School of Materials Science and Engineering Dalian University of Technology

The 3003/4045 aluminum alloys cladding hollow billets with the diameter of 60 mm and external thickness of 3 mm are fabricated by horizontal electromagnetic continuous *** surface features of ingots and microstructures of the bonding interface are *** results show that cladding hollow billets combine the external and internal layers by metallurgical bonding without mixing when the pouring temperature of the external liquid metal is 903 *** diffusion region with the thickness of 25 μm can be seen clearly,where mutual diffusion of Si and Mn atoms takes place. In addition,the intermetallic compound Al_(12)(FeMn)_3Si_2 is formed in the interface.

关键词： 3003/4045 clading hollow billets Horizontal electromagnetic continuous casting Interface

Numerical Simulation of the Electromagnetic Continuous Casting for Clad Slab

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Journal of Iron and Steel Research International 2012年第S1期19卷 153-157页

作者： YU Ying-shui WANG Tong-min SUN Jian-bo JIE Jin-chuan cao zhi-qiang LI Ting-ju School of Materials Science and Engineering Dalian University of Technology School of Materials Science and Engineering Jiamusi University

In this paper,a new electromagnetic continuous casting process to prepare clad slab is *** influence of level direct current electromagnetic field on temperature and flow fields of the melt during the fabrication of clad slab were numerically studied by the engineering software ANSYS and *** results indicated that when the magnetic flux density(B)was 0.15 T,the impact velocity and distance of the flow to the narrow face and underside of the dividing plate decreased *** the flow impact to the liquid pool was *** the same time,the high temperature zone of the melt moved away from the narrow face and the dividing plate,and distributed more uniformly. The wider semi-solid area next to the dividing plate was useful for 3003 and 4004 aluminum alloys to bond.

关键词： clad slab electromagnetic continuous casting numerical simulation

LD32-2PSP上部组块设计中温度应力的考虑

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中国造船 2008年第A2期49卷 464-470页

作者：曹志强上海利策科技有限公司上海200052

旅大32-2PSP平台原油储罐的设计温度为65℃，而非罐区的结构温度是随着环境温度的变化而变化的，所以平台在考虑正常载荷的同时，还需要考虑非罐区结构由温度变化而产生的温度应力。分析计算表明，温度应力是对平台结构设计影响最大的... 详细信息

旅大32-2PSP平台原油储罐的设计温度为65℃，而非罐区的结构温度是随着环境温度的变化而变化的，所以平台在考虑正常载荷的同时，还需要考虑非罐区结构由温度变化而产生的温度应力。分析计算表明，温度应力是对平台结构设计影响最大的因素之一，也是设计的难点和重点，因此，介绍如何通过结构上的优化设计来减小温度应力对整体结构的影响乃是有意义的。

关键词：结构设计温度应力上部组块储油罐

组织工程膀胱构建中生物支架材料及其性能评价

维普期刊数据库评论

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中国组织工程研究与临床康复 2009年第51期13卷 10145-10148页

作者：曹志强解放军沈阳军区总医院泌尿外科辽宁省沈阳市110016

背景:利用肠道进行膀胱的修复和重建仍是进行膀胱替代的金标准。但是,由于肠道处在泌尿系的环境中,可能会引起代谢紊乱、感染、结石形成甚至恶变等一系列并发症。目的:总结评价组织工程膀胱构建中生物支架材料的性能,以寻找合理的膀胱... 详细信息

背景:利用肠道进行膀胱的修复和重建仍是进行膀胱替代的金标准。但是,由于肠道处在泌尿系的环境中,可能会引起代谢紊乱、感染、结石形成甚至恶变等一系列并发症。目的:总结评价组织工程膀胱构建中生物支架材料的性能,以寻找合理的膀胱替代物。方法:以"组织工程,膀胱,支架,间充质干细胞"为中文关键词,"tissue engineering,Bladder,Mesenchymal stem cells"为英文关键词,采用计算机检索1993-01/2009-10相关文章。纳入与有关种子细胞与组织工程膀胱相关及与膀胱生物支架材料相关的文章;排除重复研究或Meta分析类文章。以29篇文献为主,重点对一下5个问题进行了讨论:①如何稳定可靠迅速地获取充足的有活力的细胞源?②膀胱生物支架材料方面的选择?③修复重建膀胱的组织工程技术选择?④伦理学问题。⑤如何促进体外构建的膀胱组织植入体内后的快速血管化?结果与结论:采用自体间充质干细胞作为种子细胞应用于膀胱组织工程,不仅取材方便、具有低免疫原性,而且还可能分化为构建膀胱组织所必须的移行上皮细胞和平滑肌细胞以及血管内皮细胞、神经细胞从而改善再生组织的血供和神经功能,并能避免移植物纤维化挛缩,显示其独特的优越性,具有广阔的发展前景。但是,组织工程膀胱用于临床的有效性尚有待进一步评估,如组织工程膀胱与自体膀胱组织的愈合、结构和功能的重塑、血管化及神经支配的建立、伦理问题等重大难题都需要进一步研究。

关键词：组织工程膀胱间充质干细胞支架

金属基固体自润滑复合涂层及其制备技术研究进展

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表面技术 2017年第9期46卷 32-38页

作者：李博雅曹志强大连理工大学化工学院大连116024 大连理工大学材料学院大连116024

金属基固体自润滑复合涂层具有强度高、耐高温、耐磨损以及易加工等特性,成为近来研究热点。首先综述了国内外金属基固体自润滑复合涂层的材料体系(即难熔金属基自润滑复合涂层、软金属基自润滑复合涂层、低温金属基自润滑复合涂层以及... 详细信息

金属基固体自润滑复合涂层具有强度高、耐高温、耐磨损以及易加工等特性,成为近来研究热点。首先综述了国内外金属基固体自润滑复合涂层的材料体系(即难熔金属基自润滑复合涂层、软金属基自润滑复合涂层、低温金属基自润滑复合涂层以及高温金属基自润滑复合涂层),随后分析了金属基固体自润滑复合涂层的润滑机理,指出润滑膜的低剪切特性是实现减磨润滑的关键。接着介绍了金属基固体自润滑复合涂层的制备技术,比较分析了烧结、电镀、化学镀、热喷涂、物理气相沉积(PVD)、化学气相沉积(CVD)、激光熔覆等技术,在制备金属基自润滑复合涂层方面的优点和不足。最后总结了目前在关于金属基固体自润滑复合涂层研究中存在的问题,进而探讨了相应的解决方案,提出应深入研究金属基体、固体润滑剂与环境三者之间的相互作用机理,并进一步指出研发新型固体润滑剂、改进现有制备技术、开发新工艺是未来重点发展的方向。

关键词：固体自润滑复合涂层金属基材料体系润滑机理制备技术摩擦