材料期刊网

Relationship between Relaxation Internal Friction Peak at about 200℃(f≈1Hz)and Bainitic Transformation In a CuZnAl Alloy

ZHAO Zengqi CHEN Feixia YANG Dazhi BAO Er ** Physical Laboratory , Baotou Research Institute of Rare Earth , Baotou , 014010 , China*** Dept.of Materials Engineering , Dalian University of Technology , Dalian , 116024 , China**** Dept.of Materials Engineering , Yanshan Uni

材料科学技术（英文）

The present investigation showed that the re- laxation peak at about 200℃ (f≈1Hz) was related to bainitic transformation in a CuZnAl alloy.The peak decreased when bainite precipitated.The activation energy of the peak was the same as the apparent activation energy of bainitic transforma- tion.According to the relations between the peak and the bainitic transformation,the mechanism of the peak has been discussed.

关键词: internal friction , null , null , null

P2O3-B2O3-Al2O3-SrO-BaO玻璃中Yb3+非辐射能量转移下Er3+离子的增强发射

张军杰 , 张龙 , 祁长鸿 , 林凤英 , 胡和方

功能材料与器件学报 doi:10.3969/j.issn.1007-4252.2000.01.006

本文研究了共掺Er3+/Yb3+P2O3-B2O3-Al2O3-SrO-BaO玻璃的能量转移过程.实验中制备了高掺杂Yb3+离子的双掺Er3+/Yb3+的磷酸盐玻璃样品.在Er3+/Yb3+掺杂比率>1:18(mol%)时,观测到了基于Yb3+离子至Er3+离子能量转移下Er3+(4I13/2→4I15/2)的增强发射和Yb3+(2F7/2→2F5/2)发射的减弱,当Yb3+离子掺杂浓度超过2.1×1021ions/cm3时(Er3+/Yb3+≤1:18,mol%),由于Yb3+离子的自淬灭效应,Er3+离子的发射强度降低.实验中得到了Yb3+离子的最佳掺杂浓度为1.74×1021ions/cm3.

关键词: Er3+增强发射 , 非辐射能量转移 , Yb3+ , 磷酸盐玻璃

Chen系统的状态变量周期性反馈控制

李开明 , 李亚洲 , 冯维贵 , 林长

量子电子学报 doi:10.3969/j.issn.1007-5461.2007.05.014

采用非线性反馈控制,用附加了带参数的正弦项对Chen系统进行了有效的控制.随着参数k的逐渐增大,系统的动力学行为呈现出一系列的变化.数值研究结果表明:随控制参数的增大,驱动信号的强度渐大,混沌系统由混沌运动到周期轨道,最终到一相点.

关键词: 混沌 , Chen系统 , 不动点 , Lyapunov指数 , 反馈控制

Characterisation of initial atmospheric corrosion carbon steels by field exposure and laboratory simulation

Corrosion Science

The early stages of the evolution of atmospheric corrosion of carbon steels exposed in both a laboratory simulated and a natural atmosphere environment in Shenyang have been observed by in situ scanning electron microscopy. In the case of laboratory cyclic wet-dry tests, even though the chloride content level is very low, filiform corrosion is initiated in the early stage. The filiform corrosion grows in random directions, forming a network of ridges. White nodules nucleate and grow on the ridges during continued corrosion and eventually connect with each other to form the initial corrosion scale. Pits were also found on the surface beneath corrosion products. In the case of a natural atmospheric environment, both filiform corrosion and other localized corrosion, such as pitting and inter-granular attack take place in the initial stage. It is obvious that there is variety of localized corrosion in the initial stage of atmospheric corrosion. (C) 2007 Elsevier Ltd. All rights reserved.

关键词: steel;atmospheric corrosion;initial stage;localized corrosion;in-situ;iron;electrolyte;thickness

Physical Simulation of New Desulphurization Technology Using Pulsed and Rotary StirringInjection

WU Wei , WU Wei , HU Yanbin , LIU Liu , DING Yongliang

钢铁研究学报(英文版)

The contrast experiment of different stirring modes, which includes a new type of stirringinjection with the method of pulse and rotation, and the initial oneway stirring method, is done through physical simulation in the laboratory. The stirring methods of pulse and rotation are of two kinds. One is pulsed and rotary stirrer with positive and opposite directions. The other is pulsed and rotary stirrer with rotationstoprotation. The results show that the stirring mode of pulse and rotation has better effects than the oneway stirring method. The specific effects are that the mixing time of the melting bath is apparently shortened, the number of grains involved in the liquid surface is increased, and the residence time of air bubble in water is doubled.

关键词: hot metal;desulphurization;injection;physical simulation;pulse;rotation

1998 COMPREHENSIVE TABLE OF CONTENTS

中国腐蚀与防护学报

N。1Atmospheric Corrosivlty for Steels………………………………………………… .LIANG Caideng HO[I i。-tat（6）Caustic Stress Corrosion Cr。king of Alloy 800 Part 2.The Effect of Thiosul执e……………………………………… KONG De-sheng YANG Wu ZHAO Guo-zheng HUANG De.ltL。ZHANG Yu。。he CHEN She。g-bac（13）SERS slid E16CttOCh6iniC81 Stlldy Of Illhibit1Oli M6ch＆tllsth Of ThlollY68 Oil ITOll ID H....

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THE MECHANICAL BEHAVIOR OF LABORATORY CROSS-WELD SPECIMEN AND ITS RELATION WITH THE PRACTICAL CASES AT ELEVATED TEMPERATURE

Author S.T. TU , J.M. Gong and X. Ling Nanjing University of Chemical Technology , Nanjing 210009 , ChinaManuscript received 18 October 1998

金属学报(英文版)

In order to interpret the test results of crossweld specimens for application in practical welded components, the present paper studies the high temperature behavior of laboratory cross weld specimens in terms of the uniaxial material tests and numerical simulations. It is found that the crossweld specimen may be used for the high temperature strength assessment, but can hardly be used for life assessment of the practical welded components, which depends on the loading conditions of the components.

关键词: high temperature , null , null , null , null

THE CALCULATION OF BaO ACTIVITIES IN BaO-BaF_2-Cr_2O_3 SYSTEM FLUXES USING SCHUHMANN METHOD

L.F. Li , Z.P. Chen , M.F. Jiang and W.Z. Wang(Department of Ferrous Metallurgy , School of Materials and Motallurgy , Northeastern University Shenyang 110006 , China)(The Technology Center , Baoshan Iron & Steel Complex , Shanghai 201900 , China)

金属学报(英文版)

The principle and steps for the calculation of component activities in fluxes using Schuhmann method are described. On the foris of Gibbs-Duhem equation and using Cr2O3 activities in BaO-BaF2-Cr2O3 system fiuxes, BaO activities at 1523 and 1673K are calculated, respectivelg,and the isoactivity diagrums of BaO are also obtained. The calculation results indicate that BaO activity increases with increasing its content in fiuxes, and decreaaes with the increase of Cr2O3 content at a given XBaO/XBaF2 ratio.

关键词: Shuhmann method fluxes , null , null

MEASUREMENT AND APPLICATION OF PHYSICAL PARAMETERS IN UNSTEADY HEAT CONDUCTION

S. X. Wanng , D. S. Zheng , Y. L. Liu 1) Department of Material Engineering , Luoyang Institute of Technology , Luoyang 471039 , China 2) Luoyang Copper (Group) Co. , Ltd , Luoyang , China

金属学报(英文版)

As far as the accuracy of calculating unsteady temperature field is concerned, it is very important to find the accurate physical parameters such as specific heat, thermal conductivity, latent heat of phase transformation and surface heat flux. The model for calculating H and Q is established in this paper. The measurement methods and data processing for physical parameters such as volume specific heat C, thermal conductivity k, volume latent heat of phase transformation c1 and surface heat flux are introduced The physical parameters of 1Cr18Ni9Ti and 45 steels and the surface heat flux for 1 Cr18Ni9Ti probe cooled in water,10% NaCl water and oil with different temperatures are measured, respectively. These data show that the probability of absolute error less than 2* C between the calculated and measured values in temperature field calculation reaches above 80% if using the above physical parameters, which provides a reliable technology basis for precise calculation of temperature field.

关键词: unsteady temperature field , null

ER Smart Fluids: Properties and Applications

Yanju LIU , Jinsong LENG and Dianfu WANG(Research Lab. of Composite Materials , Harbin Institute of Technology , Harbin 150001 , China)

材料科学技术（英文）

ER fluid is one of the popular materials used in smart materials and structures (SMS). In thispaper, several ER fluids were synthesized. The static and dynamic mechanic characteristics weremeasured and discussed. The application of ER fluid on a sandwich beam featuring ER fluidapplied to vibration control was investigated.

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