材料期刊网

Relationship between Magnetomechanical Damping Capacity and Vibration Modes

Junsheng LU Baorong WU Dept.of Alloy Steel , Central Iron and Steel Research Institute Beijing , 100081 , ChinaG.J.Wang Dept.of Materials Science and Engineering , University of Pennsylvania , Philadelphia , PA 19104 , USA

材料科学技术（英文）

The mathematical expressions for magnetomechanical damping capacity are presented by applying Smith-Birchak's model in torsion pendulum and cantilever beam.The peak value ψ_p is found to be related to physical parameters and material constants in the form Kλ_s=αψ_pε_p.which can be used to estimate the magnetostrictive constant λ_s from the damping capacity-strain amplitude curve.A good agreement of experimental data and theoretical prediction was observed in HIDAMETS Cr15A13NiCu.

关键词: magnetomechanical damping , null , null , null

Study on steel-mushy Al-20Sn alloy bonding

Peng ZHANG , Yunhui DU , Daben ZENG , Jianzhong CUI , Limin BA

材料科学技术（英文）

Steel-mushy Al-20Sn alloy bonding was studied for the first time. The relationship model about preheat temperature of steel plate, solid fraction of Al-20Sn alloy mushy, rolling speed and interfacial shear strength of bonding plate could be established by artificial neural networks perfectly. This model could be optimized with a genetic algorithm. The optimum bonding parameters were: 505℃ for preheat temperature of steel plate, 34.3% for solid fraction of Al-20Sn alloy mushy and 10 mm/s for rolling speed, and the largest interfacial shear strength of bonding plate was 71.2 MPa.

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Modeling of Austenite Grain Size in Low-Alloy Steel Weld Metal

A.G. Huang , Y.S. Wang , Z.Y. Li , J.G. Xiong , Q. Hu

金属学报(英文版)

The size of austenite grain has significant e®ects on components and proportions of various ferrites in low-alloy steel weld metal. Therefore, it is important to determine the size of austenite grain in the weld metal. In this paper, a model based upon the carbon diffusion rate is developed for computing austenite grain size in low-alloy steel weld metal during continuous cooling. The model takes into account the effects of the weld thermal cycles, inclusion particles and various alloy elements on the austenite grain growth. The calculating results agree reasonably with those reported experimental observations. The model demonstrates a significant promise to understand the weld microstructure and properties based on the welding science.

关键词: low-alloy steel , null , null , null

用DEPT135测定Resol的组成及微细结构参数

杨金瑞 , 余尚先 , 顾江楠

高分子材料科学与工程

通过对resol(羟甲基酚化合物和低分子量羟甲基酚树脂)DEPT135图谱的分析讨论,得到一系列计算resol微细结构参数的经验公式.根据DEPT135图谱可判断是否发生缩聚反应,根据经验公式可计算酚单体各个活性点参与反应百分率或酚羟基导入率、不同类型缩聚所占百分率及低分子量羟甲基酚树脂的平均核体数.

关键词: 羟甲基酚化合物 , 羟甲基酚树脂 , DEPT135 , 结构参数

小角度直线反走样的改进Wu算法

李铂 , 周建江 , 夏伟杰 , 吴连慧

液晶与显示 doi:10.3788/YJYXS20142904.0605

直线是机载座舱显示画面中最基本的图元,其显示质量对于整个画面的显示效果影响较大,尤其是小角度下直线显示的“麻花”现象一直是影响显示效果的关键问题之一.为了提高小角度下直线的显示效果,本文提出了一种基于Wu算法的亮度渐变改进算法.该算法通过渐进地展现直线从轴方向上的亮度变化过程,减少亮度畸变,有效地改进了显示效果.通过Matlab仿真和FPGA实现,验证了该算法反走样后的小角度直线显示效果明显优于其他算法,而且结合中点画线法后,绘制时间与Wu算法相当.同时该算法还可改善大角度直线和圆弧的显示效果,消除了大角度直线的边缘锯齿,解决了圆弧在小角度部分的虚化问题.因此本文算法可用于对实时性和显示效果要求高的机载座舱显示系统,以缓解飞行员的视觉疲劳.

关键词: 座舱显示 , 反走样 , 改进Wu算法 , 小角度 , FPGA实现

AN EXPERT SYSTEM FOR COMPUTER AIDED ALLOY STEEL DESIGN—ASPRES

CHEN Yu , CHEN Nianyi Shanghai institute of Metallurgy , Academia Sinica , Shanghai , China PENG Ping , KONG Bingyu Iron and Steel Research Institute , Shanghai Baoshan Iron and Steel Complex , Shanghai , China professor , Shanghai Institute of Metallurgy , Academia Sinica , Shanghai 200050 , China

金属学报(英文版)

An alloy steel pattern recognition expert system,ASPRES,has been established for the purpose of computer aided optimal design of alloy steel in compositions and process pa- rameters,Pattern recognition techniques are used to abstract inner relationship between mechanical properties and process variables.The ASPRES uses 2-dimensional graph as visual knowledge to represent domain expertise of specific object.Forward and back- ward chaining can be utilized by researcher in predicting sample performances or giving helpful suggestions about the chemical compositions and process parameters according to desired properties.

关键词: pattern recognition , null , null

REVIEW AND PROSPECT OF HIGH STRENGTH LOW ALLOY TRIP STEEL

L.Li , P.Wollants , Y.L.He , B.C.DeCooman , X.C.Wei , Z.Y.Xu

金属学报(英文版)

Research status of high strength low alloy TRIP (transformation induced plasticity) steels for automobile structural parts is briefly described. Composition and microstructure factors especially the morphology, size and volume fraction of retained austenite,which largely influence the strength and ductility of the steel, are reviewed and discussed one after another. Modelling of the inter-critical annealing and martempering processes as well as the designing of the TRIP steel aided by commercial software are introduced. Some special aspects of the dynamic mechanical properties of TRIP steel are firstly reported.

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Compatibility of Austenitic Steel With Molten Lead-Bismuth-Tin Alloy

ZHANG Rui-qian , LI Yan , WANG Xiao-min

钢铁研究学报(英文版)

The compatibility of the austenitic AISI 304 steel with Pb-Bi-Sn alloy was analyzed. The AISI 304 steels were immersed in stagnant molten Pb-33.3Bi-33.3Sn alloy at 400, 500 and 600 ℃ for different exposure times (100-2000 h) respectively. X-Ray diffraction spectrum (XRD) with a Y-4Q system (CuKα, λ=0.15478 nm) was used to identify the phases on the surface of specimens after exposing to Pb-Bi-Sn liquid metal (LM). The surface and cross section of the specimens were analyzed by means of scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). The result showed that a FeSn alloy layer on the surface of all specimens was formed, and it prevented AISI 304 steel matrix from penetration attack and loss of alloy elements at 400 and 500 ℃.

关键词: austenitic steel , lead-bismuth-tin alloy , compatibility , liquid-metal bond , uranium-zirconium hydride fuel

Evaluation of electrodeposited Fe-Ni alloy on ferritic stainless steel solid oxide fuel cell interconnect

Journal of Power Sources

Fe-Ni alloy is electrodeposited on ferritic stainless steel for intermediate-temperature solid oxide fuel cell (SOFC) interconnects application. The oxidation behavior of Fe-Ni alloy coated steel has been investigated at 800 degrees C in air corresponding to the cathode environment of SOFC. It is found that the oxidation rate of the Fe-Ni alloy coated steel becomes similar to that of the uncoated steel after the first week thermal exposure, although the mass gain of the coated steel is higher than that of the uncoated steel. Oxide scale formed on the uncoated steel mainly consists of Cr(2)O(3) with (Mn,Cr)(3)O(4) spinel. However. a double-layer oxide structure with a Cr-free outer layer of Fe(2)O(3)/NiFe(2)O(4) and an inner layer of Cr(2)O(3) is developed on the Fe-Ni alloy coated steel. The scale area specific resistance (ASR) for the Fe-Ni alloy coated steel is lower than that of the scale for the uncoated steel. (C) 2009 Elsevier B.V. All rights reserved.

关键词: Solid oxide fuel cell;Fe-Ni alloy;Interconnect;Oxidation;Area;specific resistance;chromium-containing alloy;sofc cathode degradation;mn-co alloys;electrical-properties;protection layers;doped lagao3;conductivity;performance;separator;magnesium

Characterization of Rust Layer Formed on Low Alloy Steel Exposed in Marine Atmosphere

Quancheng ZHANG , Jiansheng WU , Wenlong ZHENG , Jianjun WANG , Jiaguang CHEN , Xiaofang YANG , Aibai LI

材料科学技术（英文）

The iron rust phases formed on low alloy steels containing different quantities of Cr element have been characterized using EPMA, Raman spectroscopy, TEM, optical microscopy etc. The ion selective properties of synthesized rust films with the same phase constituent as the atmospheric corrosion products were investigated using self-made apparatus. The results showed that corrosion loss of steels exposed in marine atmosphere decreased rapidly as the Cr content of the steel was increased. Cr-containing steels were covered by a uniform compacted rust layer composed of fine particles with an average diameter of several nanometers. Inner rust layer of Cr-containing steel (2 mass fraction) was composed of a-CrxFe1-xOOH, with Cr content of about 5 mass fraction. Such rust layer showed cation selective property, and could depress the penetration of Cl- to contact substrate steel directly.

关键词: Corrosion , null , null , null