材料期刊网

LIFE PREDICTION OF HIGH TEMPERATURE STRUCTURALCOMPONENT BY STRAIN RANGE PARTITIONING

Author M. Miyahara1) and K. Tokimasa2) 1) Corporate Research & Development Laboratories , Sumitomo Metal Industries , Ltd. , Amagasaki , Japan2) Department of Mechanical Engineering , School of BiologyOriented Science and Technology , Kinki University , Uchitacho , Wakayama , JapanManuscript received 18 October 1998

金属学报(英文版)

The authors recent works on the improvement of the Strain Range Partitioning(SRP) method and its application to the life prediction of high temperature structural components are summarized. Examined components are divided into three groups, that is, components in the steel production plants, in the automobile and in the fossil power plants. Based on the results of the inelastic analysis and the creepfatigue properties of the material, which were obtained by IJ(=PP,PC, CP, CC) tests, the effects of the material properties, operating conditions and configuration of components were quantitatively evaluated to select the most effective measures for the thermal fatigue life extension. The SRP has been successfully applied until now to the life prediction and extension of the actual structural components subjected to thermal cycling by the authors.

关键词: creepfatigue , null , null , null

Preparation and Application of Ultra Fine Particles

M.Oda , K.Setoguchi , E.Fuchita and C.Hayashi(UFP Division , Vacuum Metallurgical Co. , Ltd. , 516 Yokota , Sanbu-cho , Sanbu-gun , Chiba-pref. , Japan 289-12)

材料科学技术（英文）

UFPs are formed using gas evaporation methods. In the gas evaporation methods, configuration of UFPs are controlled to form chain-like shape, complex, and isolated UFP. UFP films can be formed through the gas deposition method, where formed UFPs are ejected out of a nozzle and deposited on a substrate, forming patterns

关键词:

THE REMAINING LIFE EVALUATION BASED ON THESTRAIN RANGE PARTITIONING APPROACH

Author K. Tokimasa1) and M. Miyahara2) 1) Department of Mechanical Engineering , School of BiologyOriented Science and Technology , Kinki University , Uchitacho , Wakayama , Japan2) Corporate Research & Development Laboratories , Sumitomo Metal Industries , Ltd. , Amagasaki , JapanManuscript received 18 October 1998

金属学报(英文版)

The two procedures based on the strain range partitioning approach are proposed for evaluating the remaining life by measuring the surface crack length. Both the procedures require that the material parameters describing the creepfatigue damage rule built and modified by the authors and the strain waveform applied have been clarified before the evaluation. One of the procedures can be used only when the total number of the operation cycles n are known, whereas the other is useful even when n is unknown, though it needs the additional crack length measurement. In the latter the surface crack length must be measured not only at n but also at n+n, where n is a given interval of cycles. The results of their application to Mod.9Cr1Mo and 316LC steel smooth specimens subjected to the IJ type creepfatigue loading are shown.

关键词: creepfatigue , null , null , null , null

R & D OF HYDROGEN ABSORBING ALLOYS IN JAPAN

K. Mii (Sumitomo Metal Industries , Ltd. , 1-t-3 Otemachi , Tokyo 100 , Japan)M Amano (National Research Institute for Metals , 1-2-1 Sengen , Tsukuba 305 , Japan)

金属学报(英文版)

The R & D of hydrogen absorbing alloys in Japan started in the early 1970s.Many alloys such as TiMm1.5 based alloys, Fe-Ti-O alloys (e.g. FeTi1.15 O0.024) andthe(mischmetal)Ni5 based alloys (e.g. MmNi4.5 Cr0.46 Mn0.04) were developed by the early 1980s. The application of these alloys to hydrogen storage, heat storage, heat pump, hydrogen purification and motor vehicles has been tried in many iaboratories,and the various techniques for using hydrogen absorbing alloys have been developed.The standarkization of evaluation methods for hydrogen absorbing alloys has been promoted by the Ministry of International Trade and Industry (MITI), and four of them were established as Japanese Industrial Standard (JIS).Alloys for Ni-Metal Hydride batteries have been extensively investigated since 1987in Japun. Mm-Ni-Co-Al-Mn alloys (e.g. MmNi3.55 Co0.75Al0.9Mn0.4) have been devel-oped and commereialized since 1990. The amount of production of small-size Ni-MH batteries in 1995 was about three hundred milliion in number and about one hundred billion yen. The R & D for higher enerpy-density Ni-MH batteries is intensively in progress.MITI and STA (Science and Technology Agency) have promoted the R & D of hydro-gen absorbing alloys in Japan by carrying out the national projects such as Sunshine Program (MITI: 1974-1993) and Utilization of Wind Engeray (STA 1980-1985). The New Sunshine Program (MITI 1993-2020) have started in 1993. This program con-tains the application of hydrogen absorbing alloys to Economical- Enerpy- City System and to We-NET (International Clean Energy System of Technology Utilizing Hydro-gen: World Energy Network.

关键词: hydrogen absorbing alloy , null , null , null

Calculation of the electrical field in the periodic composite and evaluation of the nonlinear susceptibility of the periodic composite

Solid State Communications

A simple Fourier approach to the calculation of the space dependent electrical field in periodic composite was present. A series expression of the field was obtained. By using this expression, the frequency-dependent cubic nonlinear susceptibility of metal-insulator composite with periodic structure was studied. (C) 1997 Elsevier Science Ltd.

关键词: dielectric response;effective dielectric-constant;inhomogeneous-media;approximation;bounds

Introduction to atmospheric corrosion research in China

Science and Technology of Advanced Materials

In this paper, we introduce the research on atmospheric corrosion in China. We describe the climate characteristics and the classification of atmospheric corrosivity across the whole country. We also describe the rusting evolution under simulated wet/dry cyclic conditions. (C) 2007 NIMS and Elsevier Ltd. All rights reserved.

关键词: atmospheric corrosion;corrosivity;rusting evolution;weathering steels;rust;mechanism;so2;o-3;no2

Effect of pressure on thermal stability of Mg65Cu25Y10 bulk metallic glass

Scripta Materialia

The pressure effect on thermal stability of Mg65Cu2Y10 bulk metallic glass has been investigated in the pressure range up to 4 GPa. It was found that the behavior of the onset crystallization temperature versus pressure significantly differs in various pressure ranges. (C) 2003 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.

关键词: metallic glass;stability;phase transformation;pressure;amorphous-alloys;crystallization;nanocrystallization;transition;liquid;phase

In situ observation of pit initiation of passivated AZ91 magnesium alloy

Corrosion Science

The initiation and growth process of pit on passivated AZ91 magnesium alloy in an atmosphere of water vapor was studied using an environmental scanning electron microscope (ESEM). The results showed that pitting corrosion only occurred at the place with the segregation of salt particles. The mechanism for pit initiation was discussed. (C) 2008 Elsevier Ltd. All rights reserved.

关键词: Magnesium;wet-dry conditions;pitting corrosion;stainless-steel;localized;corrosion;charged magnesium;chloride solution;micro-droplets;al-alloys;secm;mechanism

Strengthening and improvement of sulfide stress cracking resistance in acicular ferrite pipeline steels by nano-sized carbonitrides

Scripta Materialia

Methods used to strengthen pipeline steels generally involve a reduction in their sulfide stress cracking (SSC) resistance. A non-quench ageing process is proposed to provide higher strength combined with more excellent SSC resistance for acicular ferrite (AF) pipeline steels, while microstructural characteristics are retained. (C) 2005 Acta Materiala Inc. Published by Elsevier Ltd. All rights reserved.

关键词: ageing;strengthening;sulfide stress cracking;pipeline steels

Hardness and strain rate sensitivity of nanocrystalline Cu

Scripta Materialia

The measured hardness of nanocrystalline Cu with grain sizes (( as small as 10 nm still follows the Hall-Petch relation. A rate sensitivity of 0.06 +/- 0.01 and a flow stress activation volume of 8b(3) were determined at d = 10 nm, suggesting grain boundary activities are enhanced but not yet dominant in the plastic deformation. (c) 2006 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.

关键词: nanocrystalline Cu;hall-petch relation;grain size;strain rate;sensitivity;plastic-deformation;activation volume;tensile behavior;copper;metals;strength;ductility;fcc;ni;temperature