材料期刊网

MICROSTRUCTURE OF A RAPIDLY SOLIDIFIED Fe-C-Sn ALLOY

ZHANG Jingguo ZHANG Xiaomin LIN Yijian Shanghai Iron and Steel Research Institute , Shanghai , ChinaKE Jun (T.Ko) University of Iron and Steel Technology Beijing , Beijing , ChinaCHEN Lanying Shanghai Institute of Optic and Fine Mechanics , Academic Sinica , Shanghai , China Senior Engineer , Shanghai Iron and Steel Research Institute , Shanghai 200940 , China

金属学报(英文版)

The microstructure of a laser-melted Fe-4% C-10% Sn alloy has been studied.A non-crystalline phase was found in the upper part of the laser-melted zone:At the bottom of the melted zone,however,the microcrystalline zone which consists of α-Fe and a bet phase was observed.Fine twinning martensite exists in the other area of the melted zone.

关键词: Fe-C-Sn alloy , null , null , null

IN SITU OBSERVATION ON FORMATION OF BASKET DURING BAINITIC TRANSFORMATION

WANG Yingshu SUN Fuyu XU Wenchong Central Iron and Steel Research Institute , Ministry of Metallurgical Industry , Beijing , China Senior Engineer , Department No.13 , Central Iron and Steel Research Institute , Ministry of Metallurgical Industry , Beijing , China

金属学报(英文版)

By means of riM-190 hot-stage microscopy,the in situ observation of α-β transformation in 12Cr2MoWVTiB steel has been carried out.The sequence of the growth of ferritic needles composing bainitic basket has also been determined.According to the crystallographic analy- sis a multislip system transform model concerning the formation of basket has been proposed.

关键词: α-β transformation , null , null , null

AN APPROXIMATE ANALYTICAL PROCEDURE FOR TERNARY GIBBS-DUHEM EQUATION

WANG Jixin Baotou Research Institute of Rare Earth , Ministry of Metallurgical Industry , Baotou , China Senior Engineer , Baotou Research Institute of Rare Earth , P.O.Box 131 , Baotou 014010 , China

金属学报(英文版)

In the light of estimation model for ternary excess properties,an approximate analytical procedure for ternary Gibbs-Duhem equation was proposed,and verification by previous ternary systems as Cd-Bi-Pb and Zn-In-Cd was also made.

关键词: Gibbs-Duhem equation , null

INTRAGRANULAR VC AND M_(23)C_6 IN GH36 SUPERALLOY

LI Yuqing Research Institute of Daye Steel Works , Huangshi , China Senior Engineer , Research Institute of Daye Steel Works , Huangshi , Hubei Province 435001 , China

金属学报(英文版)

The distinct images of intragranular VC were observed on TEM in superalloy GH36 underwent normal heat treatment and prolonged aging.The size of VC particles were meas- ured by means of Moire pattern,and the misfit between VC and austenite was also calculated. The M23C6 enveloped in VC shell was also observed in the prolonged-aged specimens.The coherent relation between intragranular M_(23)C_6 twins and austenite as well as its coherent in- terface were also studied.

关键词: VC , null , null , null

MECHANISM MAP OF TORSIONAL FATIGUE FRACTURE

HU Zhizhong WU Yusheng CAI Heping MA Lihua Xi′an jiaotong University , Xi′an , China Senior Engineer , Res.Inst.for Strength of Metals , Xi′an jiaotong University , Xi′an 710049 , China

金属学报(英文版)

Studies have been made of the torsional fatigue fracture life of notched specimens,the macroscopic fractography and microscopic fracture mechanism of steel 40Cr after various tempering treatments under different stresses,With the increase of stress,the fracture model changes from normal stress fracture to longitudinal shear one,and then transversal shear one. Under same stress,with the increase of strength,the fracture mode transfers from shear to normal stress fracture.The mechanism of normal stress fracture may be:transgranular frac- ture→striation+intergranular fracture→dimple+intergranular fracture,and of shear fracture may be:transgranular fracture→shear trace→dimple.Based on the experimental results,a fracture mechanism map of torsional fatigue has been drawn up.

关键词: mechanism map , null , null

METHOD FOR POLYFAMILY PLANE TRACE ANALYSIS AND ITS APPLICATION

LI Yuqing Research Institute of Daye Steel Works , Huangshi , China Senior Engineer , Research Institute of Daye Steel Works , Huangshi 435001 , China

金属学报(英文版)

The formula for calculating included angle between polufamily plane traces of lattice systems in thin foit under hath zero tilt and non-zero tilt states was deduced and verified by certain prat tical examples.The method may be available to index the plane traces of slip.twin and other defects.especially to determine such planar defects as twin and other defects esperially

关键词: polyfamily plane , null , null , null

ON THE M_7C_3 IN Cr27 CAST IRON

LI Yuqing WANG Cirong GU Zhaofeng Research Institute of Daye Steel Works , Huangshi , China Senior Engineer , Research Institute of Daye Steel Works , Huangshi 435001 , China

金属学报(英文版)

Determination of(Fe,Cr)_7C_3 in Cr27 cast iron results about 30 v.-%.Minor Si and Mn are present.Sectional area of the M_7C_3 grains is 1—50μm~2.Combining matrix analysis of elec- tron diffraction pattern with calculated angle between plane traces,{011}twins and also {013}twins producing local environment for Ru_7B_3 are observed in the orthorhombic M_7C_3. A crystallographic model for M_7C_3 is proposed.

关键词: cast iron , null , null , 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

Recent Advances of Laser Coating Technology in China

LIANG Yong LI Ruiguo Institute of Metal Research , Academia Sinica , Shenyang 110015 , ChinaInstitute of Corrosion and Protection of Metals , Aademia Sinica , Shenyang , 110015 , China

材料科学技术（英）

Recent advances in laser coating technology including laser cladding,laser surface alloying and laser vapour deposition in China are reviewed in this paper.

关键词: laser , null , null , null , null

Development of Cast Superalloys for Gas Turbines in China

CHEN Rongzhang CHEN Wanhua Institute of Aeronautic Materials , Beijing 100095 , China.

材料科学技术（英）

As in other countries,significant achievements in the research of cast superalloys for many years have also been obtained in China.These results are important contribu- tion to the development of aero and land-based gas tur- bine engines.

关键词: cast superalloy , null