欢迎登录材料期刊网

材料期刊网

高级检索

  • 论文(1755)
  • 图书()
  • 专利()
  • 新闻()

(Ⅰ+Ⅱ)MIXED MODE HYDROGEN INDUCED CRACKING

GAO Hua XUE Lijue Shanghai University of Engineering Science , Shanghai , China Associate Professor , Dept.of Materials , Shanghai University of Engineering Science , 350 Xianxia Road , Shanghai , China

金属学报(英文版)

Hydrogen induced cracking(HIC)of 0.3% C,1% Cr,1% Mn,1% Si high strength steel has been studied under simple mode Ⅰ,mode Ⅱ and(Ⅰ+Ⅱ)mixed mode loading conditions.Af- ter being hydrogen-charged in IN H_2SO_4 solution,the material behaved hydrogen embrittlement in all the cases studied.The threshold K_(ⅡH)/K_(ⅡX) of HIC under mode Ⅱ load- ing was 0.27,which was nearly the same as that K(ⅠH)/K_(ⅠX)=0.29 under mode Ⅰ loading. While the thresholds of-HIC under(Ⅰ+Ⅱ)mixed mode loading were 0.36,0.41 and 0.37 cor- responding to the K_Ⅱ/K_Ⅰ ratio of 0.27,0.4 and O.81.The results show that simple mode Ⅰ or mode Ⅱ loading is more susceptible to hydrogen embrittlement than(Ⅰ+Ⅱ)mixed mode. For explaining the experimental results,the effects of triaxial stress as well as plastic deformation ahead of crack tip has been discussed.

关键词: (Ⅰ+Ⅱ)mixed mode , null

EFFECT OF NON-PROPORTIONAL OVERLOADING ON FATIGUE CRACK GROWTH

GAO Hua CHEN Youxuan LI Ming Shanghai University of Engineering Science , Shanghai , ChinaCHEN Dehai Shanghai Dalong Machinery , Shanghai , China Associate Professor , Dept.of Materials , Shanghai University of Engineering Science , Shanghai 200051 , China

金属学报(英文版)

The effect of proportional and non-proportional overloading on mode l fatigue crack growth have been studied,and the influences of crack tip plastic zone,crack tip blunting as well as crack closure were discussed.Proportional(model I)overloading may cause more serious crack growth retardation than non-proportional(mixed mode)overloading.Therefore,for estimating the fatigue life of engineering structures to simplify a real overload which may of- ten be non-proportional as a proportional one is not always safe.

关键词: non-proportional overloading , null , null

DISTRIBUTION OF SULFUR IN HIGH TEMPERATURE PHASES OF CAST IRON

HAN Qiyong YANG Ping SONG Weixi University of Science and Technolonology Beijing , Beijing , China Division of Metallography , Dept.of Materials , University of Science and Technology Beijing , Beijing , China

金属学报(英文版)

The distribution of subversive element sulfur in high temperature phases during solidification of cast iron was investigated by means of liquid quenching method and autoradiography.The results show that in grey cast iron,sulfur is concentrated in the liquid,flake graphite and in the peripherial area of D-type supercooled graphite eutectic cells,but less sulfur is in austenite. Besides,the content of sulfur in A-type graphite is higher than that in D-type graphite,and sulfur content in eutectic austenite is a little higher than that in primary austenite.While,in nodular graphite cast iron less sulfur is in liquid and austenite,but more in nodular graphite. The blackness of the spots on the emulsion film corresponds to the atomic percentage of radioactive substances located on the surface of the specimen.

关键词: cast iron , null , null , null

AN APPROACH TO ALL-ROUND SHAPE MEMORY EFFECT IN Ti-51Ni ALLOY

TAN Shusong XU Huibin Technische Universitate Berlin , Germany Professor , Dept.of Materials , Central South University of Technology , Changsha 410083 , China

金属学报(英文版)

A possible mechanism of all-round shape memory behaviour hy help of a physical model pro- posed by Muller has been ascertained.The all-round shape mernory effect can be due to the fact that stress induced martensite of two different orientations is formed during the martensitic transformation in the outer and inner layers of the specimen respectively.

关键词: all-round shape memory effect , null , null , null

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

Advanced Materials for Energy Storage

Advanced Materials

Popularization of portable electronics and electric vehicles worldwide stimulates the development of energy storage devices, such as batteries and supercapacitors, toward higher power density and energy density, which significantly depends upon the advancement of new materials used in these devices. Moreover, energy storage materials play a key role in efficient, clean, and versatile use of energy, and are crucial for the exploitation of renewable energy. Therefore, energy storage materials cover a wide range of materials and have been receiving intensive attention from research and development to industrialization. In this Review, firstly a general introduction is given to several typical energy storage systems, including thermal, mechanical, electromagnetic, hydrogen, and electrochemical energy storage. Then the current status of high-performance hydrogen storage materials for on-board applications and electrochemical energy storage materials for lithium-ion batteries and supercapacitors is introduced in detail. The strategies for developing these advanced energy storage materials, including nanostructuring nano-/microcombination, hybridization, pore-structure control, configuration design, surface modification, and composition optimization, are discussed. Finally, the future trends and prospects in the development of advanced energy storage materials are highlighted.

关键词: lithium-ion batteries;carbon nanotube electrodes;enhanced hydrogen;storage;metal-organic frameworks;double-layer capacitors;n-h system;carbide-derived carbons;ammonia borane dehydrogenation;ordered;mesoporous carbons;high-rate performance

REVIEW OF THE RESEARCHES ON MAGNETOSTRICTIVE MATERIALS

Y. Li and Chong-Oh Kim(Department of Materials Engineering , Chungnam National University , Taejon 305-764 , Korea)

金属学报(英文版)

The recent evolution in researeh on the magnetostrictive materials is briefly reviewed.A cotnpaboon of the relative preperties between bulk and thin film materialS, and theeNcts of addition of elements on the magnetic properties are alSo given.

关键词: magnetostriction , null , null

Stereology in Materials Science

LIU Guoquan Department of Materials Science and Engineering , University of Science and Technology Beijing , 100083 , China.

材料科学技术(英文)

Quantitative analysis of populations having a geometric structure,which has developed into a special scientific subject called microstructology or stereology,is of great importance to the characterization and evaluation of microstructures and their evolution in various processes.This paper, besides a brief discussion on those topics such as the recent developments of computer assisted image analysis,mathematical morphology,and fractal analysis,will mainly focus on the scope,fundamen- tals,present status,and perspectives of classical stereology.Several case examples of its application to materials science will also be given.

关键词: stereology , null , null , null

Some Problems of Recycling Industrial Materials

CAI Jiuju , LU Zhongwu , YUE Qiang

钢铁研究学报(英文版)

The industrial system should learn from the natural ecosystem. The resource utilization efficiency should be increased and the environmental load should be decreased, depending on the materials recycled in the system. The classification of industrial materials from the viewpoint of largescale recycling was stated. Recycling of materials, on three different levels, was introduced in the industrial system. The metal flow diagram in the life cycle of products, in the case of no materials recycled, materials partially recycled, and materials completely recycled, was given. The natural resource conservation and the waste emission reduction were analyzed under the condition of materials completely recycled. The expressions for the relation between resource efficiency and material recycling rate, and the relation between ecoefficiency and material recycling rate were derived, and the curves describing the relationship between them were protracted. The diagram of iron flow in the life cycle of iron and steel products in China, in 2001, was given, and the iron resource efficiency, material recycling rate, and iron ecoefficiency were analyzed. The variation of iron resource efficiency with the material recycling rate was analyzed for two different production ratios.

关键词: recycling;industrial material;product life cycle;resource efficiency;ecoefficiency;material recycling rate

Hydrogen Storage by Encapsulation on Porous Materials

Progress in Chemistry

Hydrogen storage is a key to the utility of hydrogen as a renewable energy source The encapsulation of hydrogen on porous materials has its special advantages In this review, the fundamentals of the encapsulation are briefly introduced The relevant porous materials of zeolites, metal coordination compounds, hollow glass microspheres, fullerenes and their derivative, and their characteristics on encapsulation of hydrogen are addressed in details Recent progresses on the studies of the encapsulation of hydrogen on porous materials are summarized The differences between the encapsulation and physical adsorption of hydrogen on porous materials are analyzed based on their required operation conditions, material specifications and energy barriers Finally, the perspectives of the applications and further studies on the encapsulation of hydrogen are discussed

关键词: hydrogen storage;encapsulation;porous materials;molecular-orbital calculations;hollow glass microspheres;boron-nitride;fullerene;diffusion;zeolites;carbon;gases;frameworks;sodalite

  • 首页
  • 上一页
  • 1
  • 2
  • 3
  • 4
  • 5
  • 下一页
  • 末页
  • 共176页
  • 跳转 Go

出版年份

刊物分类

相关作者

相关热词