材料期刊网

State-of-the-Art and Perspectives in the Field of Particulate Nanostructured Materials

R.A.Andrevski(Institute of New Chemical Problems , Russian Academy of Sciences , Chernogolovka , Moscow Region , 142432 Russia)

材料科学技术（英文）

A great attention has been paid to the research and development of nanostructured materials.The main preparation methods of ultrafine particles and nanostructured materials have been summarized. The applications of zone typical nanostructured materials have also been reviewed.The peculiar characteristics and properties. such as density, grain size, hardness, superplasticity,magnetic and catalytic properties have been discussed

关键词:

Russia's Precious Metals Market: Condition and Prospects

KOTLYAR A. Yu.

贵金属

关键词:

The Work of NAHE on Promotion of Achievements in Hydrogen Energy in Russia and of Advantages of Using Platinoids in the Energy Sector

SHELISCH P. B. , RAMENSKY A. Yu. , BEKLEMISCHEVA O. A. , RAMENSKAYA E. A.

贵金属

关键词:

DEVELOPMENT OF EFFECTIVE TECHNOLOGICAL PROCESSES OF HIGH-STRENGTH STEEL WELDING

L.I.Mikhoduj (The E. O. Paton Electric Welding Institute , NAS of Ukraine , Kiev , Ukraine)

金属学报(英文版)

Composition and service properties of high - strength low-alloyed steels with 590-980 MPa yield strength,which find an application in Russia, Belorus,Ukraine and other countries of the former USSR in manufacture of welded structures of a powerful mining and transport machinery, are given. Electrodes and wires for main processes of arc welding of these steels have been devel- oped on the basis of a rational use of different systems of alloying (08KhN2GM,08KhNG2M, and also economical systems of type 10G25, ect. ). Main approaches to the technological provess- es of manufacture of structures of high - strength steels are formulated.They are mainly directed to the weakening of de offect of the factors which contribute to a delayed fracture of joints (diffusive hydrogen,unfavourable rates of cooling,level of residual stresses). When there are no stress concentrators (and at a low level of residual stresses) the welded joints of these steels have a good resistance to fatigue and brittle fractures.As a rule, they are prevented with the help of the known approaches.It is shown that in addition to them and due to a proper selection of conditions of welding the life of welded joints of the high - strength steels can be 1. 2 - 1. 4 times in- creased.

关键词: high-strength steel , null , null , null