材料期刊网

EVALUATIONS OF INTERFACE BOND STRENGTH BETWEEN THERMAL SPRAYED COATINGS AND SUBSTRATS

L.Li 1) , Z. P.Wang. 2) , Z.K.Qu 1) , D.M.Jia 3) and Z.Jiang 4) 1) Mechanical Engineering College , Shenyang University , Shengyang 110044 , China 2) Harbin Research Institute of Welding , Harbin 150080 , China 3) Information Engineering Collage , Shenyang University , Shengyang 110044 , China 4) Materials Engineering College , University of Science and Technology Beijing , Beijing 100083 , China

金属学报(英文版)

A novel test method of measuring the interface bond strength between a thermal sprayed coating and substrate is put forward first in this paper. The test method is simple and reliable, and exists no any inherent shortcoming and controversy. The interface bond strength obtained by the test method is completely the inherent property of the interface and depends only on coating material properties, spray conditions, and technique of depositing the coating. By extensive tests, it is shown that the test tesults are very tepeatable and reliable. Furthermore, from this test, the critical coating thickness under which the coating spall can not emerge is also obtained.

关键词: coating , null , null , null

A APPLICATION OF ANSYS ON A SECTION EXTRUSION DIE

H.W.Liu 1) , H.Ding 2) and J.Z.Cui 2) 1) School of Mechanical Engineering , Shenyang University , Shenyang 110044 , China 2) School of Materials & Metallurgy , Northeastern University , Shenyang 110006 , China

金属学报(英文版)

Porthole dies are important tools in extrusion process to produce hollow sections and the life of the dies counts for the cost of products. In this work, the finite element method was adopted to analyze a particular porthole die to produce hollow rectangle sections which are widely used in construction. The upper die was mainly studied. Because it is symmetrical, a quarter of the die was analyzed. The upper die was divided into 2199 elements with 3018 nodes. Elements were produced by four steps and the geometric shape of the die could be well simulated. The boundary condition was given according to the shape of the welding chamber and an empirical average extrusion stress was adopted, which was 210N/mm 2. Three-dimensional equivalent stresses were received. The original porthole die studied had obvious stress concentration and the stress distribution was very inhomogeneous, which would heavily affect the die life. A new design was proposed in which the portholes were rearranged and their shape and dimension were changed. According to the finite element analysis, the stress distribution of the improved die was quite homogeneous and the stress concentration was lessened.

关键词: section extrusion , null , null

A STUDY OF EXPERT SYSTEM FOR SECTION EXTRUSION PROCESS BASED ON FINITE ELEMENT METHOD SIMULATION

H.W.Liu 1) , H.Ding 2) and J.Z.Cui 2) 1) School of Mechanical Engineering , Shenyang University , Shenyang 110044 , China 2) School of Materials & Metallurgy , Northeastern University , Shenyang 110006 , China

金属学报(英文版)

The samples obtained by Finite Element Method (FEM) simulation for section extrusion process have been trained on BP Neural Networks. The mapping relationsbetween die's geometrical parameters and energetic parameters, such as stress and strain generated in the die are established. The extrusion process model and its expert system are also determined. The excellent expansibility this system possesses provides a new prospect for the future development of expert system for section extrusion dies.

关键词: BP neural networks , null , null , null

IINFLUENCE OF HEAT TREATMENT TECHNOLOGY ON PROPERTY OF LOW COBALT Fe Cr Co PERMANENT MAGNETIC ALLOY

Y.M.Wang and L.X.Ding Department of material , School of Mechanical Engineering , Shenyang University , Shenyang 110044 , China

金属学报(英文版)

The research is carried out through specification measurement of magnetic property, photo analysis of electronic microscope, metallographic analysis, micro hard and so on means. The initial researches have been done about the influence on material property by solid solution treatment, heat magnetic treatment and aging treatment technology of the low cobalt Fe Cr Co alloy. Therefore, better productive technologies have been found.

关键词: permanent magnetic alloy , null , null , null

THE DEVELOPMENT OF COLD WELDING SURFACING ELECTRODE FOR BLAST FURNACE VALVE

P.Y.Zong and L.R.Zhang Mechanical Engineering College , Shenyang University , Shenyang 110044 , China

金属学报(英文版)

The Authors of this Article have done research on the cracking resistance of cold welding surfacing electrodes for blast furnace valves by adjusting the basicity of slag component, decreasing the hydrogen content and improving microstructure. The DF 2 Cold Welding Surfacing Electrodes prove to possess the following characters: 1) Excellent cracking resistance for surfacing alloys at normal temperature. 2) Excellent cracking resistance for repair welding and rewelding. 3) Excellent machinability for surfacing alloying.

关键词: cold welding , null , null , null , null

FINITE ELEMENT ANALYSIS TO THE FATIGUE STRENGTH OF SYNCHRONOUS BELT TEETH

T.L Guo , Y. Qi and Y.H. Cheng Scientific Research Department , Shenyang University , Shenyang 110044 , China

金属学报(英文版)

By means of finite element analysis methods calculated the stress, strainand displacement of the belt teeth and analysisied the factors such as load distribution,specific property coefficient of material and temperature variation, which influence the fatigue strength of the belt teeth..

关键词: finite element analysis , null , null

STUDY ON NODULE RATIO AND COMPACTED GRAPHITE RATIO OF IRON FLUID TREATED BY RARE EARTH MAGNESIUM ALLOY QUICKLY EXAMINED BY CONCENTRATED DIFFERENCE FIXING OXYGEN

L.X.Ding and Y.M.Wang Department of material , School of Mechanical Engineering , Shenyang University , Shenyang 110044 , China

金属学报(英文版)

The article uses the method of regression statistics to obtain the regression formula of iron fluid nodule ratio Q and compacted graphite ratio R, through rare earth magnesium treatment. At the same time it has given thejudging figure of Q and R, considering oxygen activity and temperature. When using oxygen activity to judgenodule ratio and compacted graphite ratio of the ironfluid treated by rare earth magnesium alloy, its limit value changes with the change of temperature.

关键词: nodule ratio , null , null , null

The effect of environmental variables on atmospheric corrosion of carbon steel in Shenyang

Chinese Science Bulletin

A study was carried out in order to investigate the effect of contaminants and meteorological variables on the rust layer of carbon steel exposed in Shenyang urban atmosphere. Seven kinds of contaminants and twelve kinds of meteorological parameters were also registered in order to correlate the data with respect to corrosion rate and the stepwise multiple regression analysis was carried out in order to obtain the best regression model. The sum of rainfall time as well as sunshine time and the concentration of H(2)S could stimulate initial atmospheric corrosion of carbon steel. The initial atmospheric corrosion kinetics of carbon steel was observed to follow the cubic equation. The corrosion products were analyzed by XRD and the transformation of phases in different periods was discussed.

关键词: contaminants;meteorological parameters;carbon steel;urban atmospheric;corrosion;stepwise multiple regression;corrosion products;rust;pollution

University of Science and Technology Beijing

JIA Shizhen University of Science and Technology Beijing , China.

材料科学技术（英文）

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The fourth editorial committee meeting of JMST was held in Shenyang, China

材料科学技术（英文）

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