材料期刊网

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF P/M TiAl ALLOYS AND THE TEMPERATURE EFFECT

Z.M.Sun , H.Hashimoto , S.Sumi , Y.H.Park and T.Abe (Materials Engineering Division , Tohoku National Industrial Research Institute 4-2-1 Nigatake , Miyagino-ku , Sendai 983-8551 , Japan) Z.H. Shan (Research Fellow of Science and Technology Agency of Japan STA)

金属学报(英文版)

Two intermetallic compounds of Ti-50at.% Al and Ti-48at.% Al-2at.% Cr were prepared with a mechanical alloying and pulse discharge sintering process. The as-sintered material showed a microstructure of equiaxed gamma grain with sub-micron size. Heat treatments in vacuum at different temperatures up to 1573K were conducted on the sintered materials. The microstructure of the material coarsened considerably after heat treatment at temperatures higher than 1523K. The mechanical properties of the as-sintered and the heat treated materials were measured at temperatures of up to 973K, with four-point bending tests. Experimental results indicated that the addition of Cr increased the fracture strength of the intermetallic compound at room temperature and at elevated temperatures as well. The bending fracture strength increased with increasing testing temperature up to about 873K and a decreasing followed up. Both fracture strength and fracture strain of the material were found to be improved by heat treatment.

关键词: titanium aluminide , 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

A research on investment casting technology of Ti alloys

Huiguan WAN , Xiumei QI , Jing TIAN , Yuyong CHEN , Weiqiang ZHA , Jun JIA

材料科学技术（英文）

In this research, the materials and the compositions of the surface slurries were chosen by considering the characteristics of Ti investment casting. The effects of solid-liquid ratios on the properties of the slurry and the effects of baking temperatures on the flexural strength have also been investigated. Flawless shells having smooth inner surface were manufactured with proper technology. Ti and its alloys were melted and poured by water-cooled Cu crucible vacuum induction furnace. The qualities of the investment castings made accordingly were studied and analyzed.

关键词:

INTERACTION BETWEEN CORROSION AND WEAR OF STA LESS STEEL IN H_3PO_4+NaCl SOLUTION

ZHANG Tiancheng JIANG Xiaoxia LI Shizhuo SHI Changxu Institute of Metal Research , Academia Sinica , Shenyang , China Institute of Metal Research , Academia Sinica , Shenyang 110015 , China

金属学报(英文版)

Plots of corrosion-wear loss vs load and anodic polarization curves during wearing were for a duplex stainless steel in 69% H_3PO_4 solution with or without Cl~- by a pin-on-disc apparatus.Morphologies of tracks and debris as well as variation of Vicker hardness of worn surface were also examined.The Cl~- may impel the embrittlement and tear of worn surface,so as to accelerate the corrosi-wear loss of the steel.

关键词: duplex stainless steel , null , null

Huazhong University of Science and Technology(H.U.S.T)

材料科学技术（英文）

关键词:

Research on Deformation, Texture and Properties of IF Steel in Multiple Rolling Technology

Jinxia LI , Xianghua LIU , Guodong WANG

材料科学技术（英文）

The relationships among the deformation, texture and deep drawing properties of IF steel were investigated. By adopting double cold rolling (DCR) technology, the deep drawing property has been developed evidently. With the aid of orientation distribution function (ODF) analysis, it was found that the main reason for good property is the counterbalance in intensity of the ideal texture component {111}<011> and {111}<112>.

关键词: Texture , null , null , null

Research and Application of Flat Roll Technology in the Downstream Stands for CSP

GUO Defu , HE Anrui , SHAO Jian , YANG Quan , WANG Zhongming , WANG bo

钢铁研究学报(英文版)

CVC mills are generally used in the whole stands of CSP (Compact Strip Product). Their special “s” curve of work roll contour and shifting strategy aimed at controlling strip shape, and the characteristics of continuous casting and rolling production, which make the work roll wear in downstream stands seriously uneven, and easily form abnormal transverse profile at the rolling end. As a result, CVC mill configuration in the downstream stands can not meet the profile and flatness control requirement for schedule free rolling, and bring some difficulties in profile and flatness control for the subsequent cold rolling. Based on the characteristics of the shape control system of CSP production line, and combined with the theory of flat roll technology, a kind of technology solution of using flat roll in the downsteam stands for CSP hot strip mills was proposed. At last, industrial test was carried out in the last stand of Masteel CSP, and good results were obtained.

关键词: CSP; flat roll; wear; shifting strategy; profile; flatness

Foreword for the special issue of the 7th China-Japan bilateral symposium on high temperature strength of materials

金属学报(英文版)

关键词:

Laser-Heated Diamond-Anvil Cell (LHDAC) in Materials Science Research

N.V.Ch , ra Shekar , P.Ch.Sahu , K.Govinda Rajan

材料科学技术（英文）

Laser-heated diamond-anvil cell (LHDAC) is emerging as the most suitable, economical and versatile tool for the measurement of a large spectrum of physical properties of materials under extreme pressure and temperature conditions. In this review, the recent developments in the instrumentation, pressure and temperature measurement techniques, results of experimental investigations from the literature were discussed. Also, the future scope of the technique in various avenues of science was explored.

关键词: Laser heating , null , null , null

University of Science and Technology Beijing

JIA Shizhen University of Science and Technology Beijing , China.

材料科学技术（英文）

关键词: