材料期刊网

Relationship between Grain Size and Fatigue-Creep Interaction Behaviour of Superalloy GH698

YANG Wangyue , ZHANG Jishan , CHEN Guoliang , TIAN Shusen , GENG Qingquan Beijing University of Iron and Steel Technology , Beijing , China. Institute of Metal Research , Academia Sinica. Fushun Steel Works , Fushun , Liaoning , China.

材料科学技术（英）

The deformation and fracture behaviour of nickel-base superalloy GH698 with different grain size have been studied at 700℃ under fatigue-creep interaction conditions. Compared with coarse-grained specimens, the grain refining process shows obvious effect on the mechanical behaviour of the alloy, i. e. in F and C zones, the fraction of pure fatigue and creep fracture on fracture surfaces is greatly reduced, which decreases and increases the fracture life in zones F and C respectively, in FC and C zones, creep deformation is greatly restrained by the alternating stress component, which increases the fracture life remarkably. It is also proved that in spite of the difference in microstru- tures such as grain size, for a constant tem- perature, a unique life equation t_r=A~n can be used to predict rupture life within the stress region controlled by the same fracture mode.

关键词: Ni-base superalloy , null , null

Titanium Transfer in Slag/Metal Systems for Ironmaking

DU Hegui Northeast University of Technology , Shenyang , China.

材料科学技术（英）

The smelting of titaniferous magnetite in blast fuynace in China is unique in the nature of problems and their solutions. Fundamentals of this successful technology will be discussed. Topics to be covered are: (1) the characteristics of high content TiO_2 in blast furnace slag; (2) influence of various factors on Ti transfer process; (3) raising oxygen potential for adequate fluidity of the slag with TiO_2 in the range of 25-30 wt-% and stability of TiC and TiN in slag.

关键词: titanium transfer , null

An Improvement on Adhesion of Sputtered TiC Coating to Steel Substrate

QI Zhenzhong , YAO Weiguo , WANG Yuqi , LIU Ling , JIA Junhui Institute of Solid State Physics , Academia Sinica , Hefei , China.

材料科学技术（英）

Introducing N_2 during sputtering and pre-oxidation of substrate were investigated to improve the adhesion of sputtered TiC coating to steel substrate. The results show that yeactive gas N_2 increases the adhesion of TiC coating to steel because of a graded interface existing between coating and substrate. The interaction of discharge plasma with the surface of substrate was discussed. Pre-oxidation of substrate is effective for improving the adhesion due to the fomation of FeTi0_3 which appeared as an inteylayer between coating and pre-oxidized substrate.

关键词: Sputtering , null , null , null , null

Crack Initiation under Cyclic Compression

FENG Meibin CHEN Xinzeng HE Jiawen 2nd Automobile Works , Shiyan , Hubei , China. Ningbo University , Ningbo , Zhenjiang , China. Xi'an Jiaotong University , Xi'an , China.

材料科学技术（英）

The crack initiation behaviour under cyclic compression foy the notched specimen was investigated. It has been found that the cycles for crack initiation increase with the increase of compressive mean stress, and the decrease of stress amplitude. The stress amplitude plays a more important role than the mean stress does. Photoelastic coating and finite element methods were employed to measure and calculate the stress field in the notched part. The resul ts show that the crack initiation under compression is attributed to the tensile stress which may exist during unloadtng. If the true stress state in the notch is compressive, no crack initiates.

关键词: crack initiation , null , null

The Acoustic Emission Effects of Martensite Transformation in Alloys Cr12MoV and Fe-33Ni-4Ti-10Co

JIAO Chengge , ZHANG Baoqi , WU Gaohui , YAO Zhongkai Harbin Institute of Technology , Harbin , China. Daqing Petroleum College , Anda , China.

材料科学技术（英）

关键词: acoustic emission , null , null

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

Texture of Magnetron Sputter-deposited 1Cr18Ni9Ti Stainless Steel

WANG Fuhui , LOU Hanyi , LIU Dacheng , CAO Chunan Institute of Corrosion and Protection of Metals , Academia Sinica , Shenyang , China.

材料科学技术（英）

关键词: texture , null , null

The Morphology of Rolling Contact Fatigue Fracture of Hardened Steels

WANG Xu , ZHANG Shouhua , CUI Peiyong Beijing University of Science and Technology , Beijing , China. Central Iron and Steel Research Institute , Beijing , China.

材料科学技术（英）

Rolling Contact Fatigue(RCF) is a cumulative damage phenomenon when metals are subjected to repeated contact stresses. The fomation of pitting on the contact surface is the result of the rolling contact fatigue. The morphologies of rolling contact fatigue fracture of the har- dened steels (86CrHoV7, 42CrMo) show that strong resemblance in fractuye mechanisms exists between rolling contact fatigue and uni-axial fatigue. Since fatigue striations are hardly observed in hardened steels under uni-axial fatigue, it is interesting to note that the state of stress in rolling contact fatigue is more favor- able to ductile fractures than in uni-axial fatigue.

关键词: rolling contact , null , null , null , null , null

R&D STATUS ON INTERMETALLICS IN CHINA

CHEN Guoliang(State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 , China)SHI Changxu (Academia Sinica , Beijing 100864 , China)

金属学报(英文版)

This paper briefiy introduces the R&D of intermetallics in China. R&D on intermetallics in a national scale in China began near ten years ago. The investigation in past years focused on the fundamental research and materials development. A significant progress has been made. Various components that made of Ti3Al Ni3Al, TiAl and Fe3Al have been successfully manufactured Some of them have been evaluted. It is expected that some intermetallic alloys will be produced in an industrial scale in the near future.

关键词: :intermetallic alloys , null , null , null

Key R&D activities for development of new types of wrought magnesium alloys in China

Transactions of Nonferrous Metals Society of China

Many researchers in China are actively engaged in the development of new types of wrought magnesium alloys with low cost or with high-performances and novel plastic processing technologies. The research activities are funded primarily through four government-supported programs: the Key Technologies R&D Program of China, the National Basic Research Program of China, the National High-tech R&D Program of China, and the National Natural Science Foundation of China. The key R&D activities for the development of new wrought magnesium alloys in China are reviewed, and typical properties of some new alloys are summarized. More attentions are paid to high-strength wrought magnesium alloys and high-plasticity wrought magnesium alloys. Some novel plastic processing technologies, emerging in recent years, which aim to control deformation texture and to improve plasticity and formability especially at room temperature, are also introduced.

关键词: wrought magnesium alloy;microstructure;properties;alloy designing;plastic deformation;research projects;y-zr alloys;mechanical-properties;mg-4y-4sm-0.5zr alloy;grain-refinement;rare-earth;microstructure;gd;phase;temperature;evolution