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Modeling Study of the Particle Pinning Effect on the Grain Boundary Movement

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Journal of Iron and Steel Research International 2011年第S1期18卷 342-345页

作者： WANG Xue-lun 1,FU Li-ming 2,WANG Wei 3.JIA Zhi-xin 1 (1.Rizhaosteel Technology Center,Rizhao Iron and Steel Co Ltd.Rizhao 276806,china 2.school of Materials science and {3.,shanghai jiaotong university,shanghai 200240 china 3.Department of Structural Steels,Baosteel Research Institute,shanghai 201900,china) Rizhao Iron & Steel Co Ltd Rizhaosteel Technol Ctr Rizhao 276806 Peoples R China shanghai jiao tong Univ Sch Mat Sci & Engn Shanghai 200240 Peoples R China Baosteel Res Inst Dept Struct Steels Shanghai 201900 Peoples R China

In this work,based on the classical grain boundary (GB) formula and the principle of work-energy conversion,a new physically-based model has been developed to predict the particle pinning force concerning the interaction between second phase particles (SPPs) and the moving *** effect of particles pinning on the GB movement is *** modeling results can be applied to quantitatively determine the critical numbers of SPPs required for complete pining the grain growth,such as the critical SPPs number of the unit GB area,the critical number for single grain stagnation,the critical volume fraction of particles at a given particle *** predictions are in good agreement with the experimental results by Gladman.

关键词： the second-phase particle pinning force physical-based model

Wear Behavior of Diamond-Coated Drawing Dies

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Transactions of Tianjin university 2011年第4期17卷 259-263页

作者：林子超孙方宏沈彬 school of Mechanical engineering Shanghai Jiao Tong University

The failure behavior of diamond-coated die was investigated experimentally and analytically through finite element method (FEM) simulation in the present work. Diamond coatings were fabricated by straight hot filament chemical vapor deposition (CVD) passing through the interior hole of the drawing die using a mixture of hydrogen and acetone as source gases. The performance tests were made under real drawing condition. Scanning electron microscopy (SEM) was used for the study of coating wear after die service. The coating wear appears on two regions of the reduction zone: one is near the entrance where the contact begins, and the other is at the end of the reduction zone. FEM simulation was made for calculating the von Mises stresses distribution on the coating and substrate during the drawing process. The present work was of great practical significance for the improvement of drawing performance of diamond-coated drawing dies.

关键词： wire drawing diamond coating wear FEM simulation

Effects of Iron on Growth and Intracellular Chemical Contents of Microcystis aeruginosa

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Biomedical and environmental sciences 2010年第1期23卷 48-52页

作者： CHONG WANG,HAI-NAN KONG ,XIN-ZE WANG,HAO-DONG WU,YAN LIN,AND SHENG-BING HE school of environmental science and {3.,shanghai jiao tong university,shanghai 200240,china [a] school of environmental science engineering Shanghai Jiao Tong University Shanghai 200240 China

Objective To investigate the effect of iron on the growth, physiology and photosynthesis of cyanobacteria. Methods A gradient of iron concentrations was employed to investigate the growth, photo-pigments （chlorophyll A and phycocyanin）, and cell chemical contents （C, N, P） of Microcystis aeruginosa in response to different iron additions. Results The specific growth rate during the exponential growth phase, as well as the cell chlorophyll A and the phycocyanin content, was limited by iron below 12.3.mol Fe.L^-1. The growth was inhibited when the iron concentration was at 24.6 μmol Fe.L^-1. The cell chlorophyll A and the phycocyanin content were saturated when the iron concentration was above 12.3.mol Fe.L^-1 and declined slightly at 24.6 μmol Fe.L^-1. At a low iron concentration （about 6.15 μmol Fe-L^-1 and less）, the cell nitrogen and carbohydrate content were iron limited, and the variation of the cell phosphorus content was similar to that of the nitrogen and carbohydrate, with a transition point of 12.3.μmol Fe.L^-1. Conclusion The variation ofcynobacteria growth is synchronous with that of the photo-pigments or the cell chemical content, and there exist relationships among photosynthesis, growth and internal chemical content, which could be useful for the growth estimation from the cell characteristics.

关键词： Iron Growth Photo-pigments Carbohydrate Phosphorus Nitrogen

PREDICTION OF FLOW STRESS OF HIGH-SPEED STEEL DURING HOT DEFORMATION BY USING BP ARTIFICIAL NEURAL NETWORK

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Acta Metallurgica Sinica(English Letters) 2000年第1期13卷 394-400页

作者： J. T. Liu H.B. Chang R.H. Wu T. Y. Hsu(Xu Zuyao) and X.R. Ruan( 1)Department of Plasticity Technology, shanghai jiao tong university, shanghai 200030, china 2){3. of Materials science and engineering, shanghai jiao tong university, shanghai 200030,

The hot deformation behavior of TI (18W-4Cr-1V) high-speed steel was investigated by means of continuous compression tests performed on Gleeble 1500 thermomechan- ical simulator in a wide range of tempemtures (950℃-1150℃) with strain rotes of 0.001s-1-10s-1 and true strains of 0-0. 7. The flow stress at the above hot defor- mation conditions is predicted by using BP artificial neural network. The architecture of network includes there are three input parameters:strain rate,temperature T and true strain , and just one output parameter, the flow stress ,2 hidden layers are adopted, the first hidden layer includes 9 neurons and second 10 negroes. It has been verified that BP artificial neural network with 3.9-10-1 architecture can predict flow stress of high-speed steel during hot deformation very well. Compared with the prediction method of flow stress by using Zaped-Holloman parumeter and hyperbolic sine stress function, the prediction method by using BP artificial neurul network has higher efficiency and accuracy.

关键词： T1 high-speed steel flow stress prediction of flow stress back propagation (BP) artificial neural network (ANN)

Microstructure characterization of high-energy product Nd-Fe-B thin film

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Progress in Natural science:Materials International 2010年第01期20卷 76-80页

作者： Fang XU~1,Fang YANG~2,Xian-ping DONG~1,Lan-ting ZHANG~1,Wei LIU~2,Zhi-dong ZHANG~2 1.school of Materials science and engineering,{3. jiao tong university,{3. 200240,china 2.Shenyang National Laboratory for Materials science,Institute of Metal Research and International Centre for Materials Physics,Chinese Academy of sciences,Shenyang 110016,china [a] school of Materials science and engineering Shanghai Jiao Tong University Shanghai 200240 China [b] Shenyang National Laboratory for Materials science Institute of Metal Research and International Centre for Materials Physics Chinese Academy of Sciences Shenyang 110016 China

A Si/Mo（50 nm）/Nd-Fe-B（400 nm）/Mo（50 nm）film with relatively high-energy product（BH）max=247 kJ/m3.was prepared on a Si substrate heated at 650℃.The microstructure of the film was investigated by X-ray diffractometry（XRD）and high-resolution transmission electron microscopy（HRTEM）.The Nd-Fe-B thin film shows a notable out-of-plane c-axis *** （110）orientated Mo grains is proved to promote the growth of c-axis oriented texture of the Nd2Fe14B grains,which is favorable to achieve a high ***-scale spherical Nd-O phases composed of randomly orientated polycrystalline grains and a sharp grain boundary without grain boundary phase between two Nd2Fe14B grains are *** coercivity highly depends on a certain amount of Nd-O phase and interface morphology.

关键词： Nd-Fe-B thin films microstructure Nd-O phase magnetic properties

Effect of Solute Drag and Precipitate Pinning on Austenite Grain Growth in Ti-Nb Microalloyed Steels

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Journal of Iron and Steel Research International 2011年第S1期18卷 383-387页

作者： FU Li-ming 1,WANG Huan-rong 2,WANG Wei 2,SHAN Ai-dang 1 (1.school of Materials science and engineering,{3. jiaotong university,{3. 200240,china 2.Department of Structural Steels,Baosteel Research Institute,{3. 201900,china) shanghai jiao tong Univ Sch Mat Sci & Engn Shanghai 200240 Peoples R China Baosteel Res Inst Dept Struct Steels Shanghai 201900 Peoples R China

A metallurgical model concerning the co-effect of the Nb solute drag and the complex carbonitride precipitates pinning is proposed to predict the recrystallization austenite grain growth of low carbon Nb-containing microalloyed *** analysis,both predicted and experimental,reveals the precipitate pinning plays a dominate role in suppressing the austenite grain growth with less Nb solute drag effect in high temperature region whereas the Nb solute drag predominates in relatively low temperature region.A factor p is suggested to assess the effectiveness of drag and *** pinning and the drag are more effective in restraining grain growth as p>0 and p<0,respectively.A low carbon Nb microalloyed steel and a kind of Ti-modified low carbon Nb steel by Ti substituting for part of Nb are employed to validate the modeling *** theoretical calculations show a good agreement with experimental results.

关键词： grain growth precipitates pinning solute drag Ti-Nb microalloyed steels

稀土改性玻璃纤维对PTFE复合材料摩擦磨损性能的影响

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无机材料学报 2002年第6期17卷 1321-1326页

作者：程先华薛玉君谢超英上海交通大学机械工程学院上海交通大学材料科学与工程学院上海200030

分别用硅烷偶联剂SG-Si900(SGS)、含SG-Si900的稀土溶液(SGS/RES)和稀土溶液(RES)对玻璃纤维进行表面改性,考察了稀土改性玻璃纤维填充的PTFE复合材料在油润滑条件下的摩擦磨损性能,并用扫描电子显微镜(SEM)分析了磨损表面形貌.结果表明... 详细信息

分别用硅烷偶联剂SG-Si900(SGS)、含SG-Si900的稀土溶液(SGS/RES)和稀土溶液(RES)对玻璃纤维进行表面改性,考察了稀土改性玻璃纤维填充的PTFE复合材料在油润滑条件下的摩擦磨损性能,并用扫描电子显微镜(SEM)分析了磨损表面形貌.结果表明:与未经表面改性玻璃纤维填充的PTFE复合材料相比,经表面改性玻璃纤维填充的PTFE复合材料的减摩耐磨性能得到提高,以RES的作用最明显,SGS/RES次之,SGS第三;在油润滑条件下,稀土改性玻璃纤维填充的PTFE复合材料只出现了轻微磨损,这是由于玻璃纤维经稀土表面改性后极大地改善了玻璃纤维与PTFE基体之间的界面结合力,使稀土改性玻璃纤维填充的PTFE复合材料具有优异的摩擦磨损性能.

关键词：稀土改性玻璃纤维 PTFE复合材料摩擦磨损性能聚四氟乙烯

New method for measuring the degree of conflict among general basic probability assignments

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science china(Information sciences) 2012年第2期55卷 312-321页

作者： HE You1,HU LiFang1,2,GUAN Xin1,3.DENG Yong4 & HAN DeQiang5 1Research Institute of Information Fusion,Naval Aeronautical and Astronautical university,Yantai 264001,china 2Navy Armament Academy,Beijing 102249,china 3.he Institute of Electronic {3. and engineering,National university of Defense Technology,Changsha 410073.china 4school of Electronics and Information Technology,shanghai jiao tong university,shanghai 200240,china 5Institute of Integrated Automation,Xi'an jiaotong university,Xi'an 710049,china 1. Research Institute of Information Fusion Naval Aeronautical and Astronautical University Yantai 264001 China2. Navy Armament Academy Beijing 102249 China3. The Institute of Electronic Science and Engineering National University of Defense Technology Changsha 410073 China4. School of Electronics and Information Technology Shanghai Jiao Tong University Shanghai 200240 China5. Institute of Integrated Automation Xi’an Jiaotong University Xi’an 710049 China

There is doubt about Dempster's rule of combination because of counter-intuitive results when dealing with conflict information in intelligent ***,many modified combination rules have been presented in the literature on multi-source information fusion and reasoning with ***,the issue of identifying conflict among evidence has been ignored.A new parameter measuring conflict evidence called the conflict distance parameter is defined to determine whether there are conflicts in evidence based on the analysis of existing conflict *** the same time,a decisive rule,which a reasonable conflict measure function should satisfy,is put ***,an analysis of two typical counter-intuitive situations is given,showing that the new parameter can not only satisfy the decisive rule,but can also attain the same effect as a two-dimensional measure when deciding whether to use the Dempster's rule of combination,and can exceed its effect when deciding whether to use Dezert-Smarandache theory.

关键词： conflict evidence Dezert-Smarandache theory Dempster’s rule of combination information fusion uncertainty

论现行法律关于水资源环境信息管理体系的规定

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现代法学 2003年第4期25卷 140-147页

作者：王曦上海交通大学法学院上海200030

关于环境信息的收集、处理、交流和使用的法律规定是环境法的重要组成部分。由于水资源与经济发展和人民生活息息相关,加强和完善有关水资源的信息管理体系的任务显得尤为迫切。本文查证我国有关水资源的法律中关于环境信息的收集、处... 详细信息

关于环境信息的收集、处理、交流和使用的法律规定是环境法的重要组成部分。由于水资源与经济发展和人民生活息息相关,加强和完善有关水资源的信息管理体系的任务显得尤为迫切。本文查证我国有关水资源的法律中关于环境信息的收集、处理、交流和应用的法律规定并分析其实施情况。在这种查证和分析的基础上,本文对如何完善我国水资源环境信息管理体系提出了若干建议。

关键词：水资源环境信息管理体系环境法法律保护制度环境质量