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CN 21-1315/TG
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      28 July 1992, Volume 8 Issue 4 Previous Issue    Next Issue
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    Articles
    Fatigue Behaviour of Metal Matrix Composites
    WANG Zhongguang SUN Zhengming YU Weicheng ** State Key Laboratory for Fatigue and Fracture of Materials,Institute of Metal Research,Academia Sinica,Shenyang.110015,China+ To whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (4): 235-248. 
    Abstract   HTML   PDF (3791KB)
    Based mainly on the work done at the authors' laboratory in recent years,this paper examines what is currently known about the cyclic deformation and fatigue properties of metal matrix composites, with particular emphasis on discontinuous fiber (whisker or particulate)-reinforced Al composites. The following items are discussed:fatigue strength and life,cyclic deformation and microstructural evolution,microcrack initiation and growth,fatigue crack propagation behaviour.
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    Fatigue Crack Propagation in Plain Carbon Dual-phase Steel
    LEI Tingquan LIN Guangyong ** Dept.of Metals and Technology,Harbin Institute of Technology,Harbin,150006,China+ To whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (4): 249-254. 
    Abstract   HTML   PDF (2566KB)
    The effect of volume fraction V_M and carbon content(%C)_M of martensite was studied on the fa- tigue crack propagation behaviour of plain carbon martensite plus ferrite M+F dual-phase steel.The experimental results show that the △K_(th)decreases and da/dn increases with increasing V_M and (%C)_M at a load ratio R=0.05.High△K_(th)values are obtained by obvious crack closing ability caused by high roughness of the fractured surfaces.
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    Cyclic Creep Deformation and Fracture of a Cr-Mo Rotor Steel at Elevated Temperatures
    ZHU Shijie YANG Zhian WANG Zhongguang ** State Key Laboratory for Fatigue and Fracture of Materials,Institute of Metal Research,Academia Sinica,Shenyang,110015,China+ To whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (4): 255-260. 
    Abstract   HTML   PDF (1449KB)
    Static creep and cyclic creep tests were carried out on a Cr-Mo rotor steel from 0.5 to 0.6 T_m. Cyclic creep retardation occurred under the test conditions.With an increase of stress frequency, cyclic creep strain rate decreases and rupture time increases.The cyclic creep strain rate for the stress wave of a square shape is higher than that of a tri- angle shape.The apparent stress exponent of cyclic creep and the apparent activation energy of cyclic creep are both higher than those of static creep.The minimum strain rate is inversely proportional to rupture time for both static and cyclic creeps at dif- ferent stresses,temperatures,frequencies and wave shapes.The cyclic creep retardation mechanism was explored by the observation and analysis of the dis- location structure and fracture surface.
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    A Method of Observing Fatigue Crack Growth by SEM
    MU Ensheng LIN Jizhong WU Yushu HU Yixiang CHENG Zhaoyin **Dept.of Metals and Chemistry,China Academy of Railway Sciences,Beijing 100081,China*** Center Laboratory,Dalian Locomotive Factory of Railway Ministry,Dalian,116021,China+ To whom correspondence s
    J. Mater. Sci. Technol., 1992, 8 (4): 261-265. 
    Abstract   HTML   PDF (2128KB)
    This paper introduces a modified control cir- cuit of static tensile stage of Cambridge S-200 SEM.The function of the stage is extended to that of a tensile/compressive dynamic fatigue testing stage.It can be used for studying fatigue micro characteristic and crack growth.Direct observa- tions of small crack growth behaviour were carried out under the SEM with modified stage.Results showed the various stages in the development of a crack.
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    Energetical Theories on Fatigue Life Prediction
    TONG Xiaoyan ** Aircraft Engineering Department,Northwestern Polytechnical University,Xi'an,710072,China
    J. Mater. Sci. Technol., 1992, 8 (4): 266-272. 
    Abstract   HTML   PDF (727KB)
    Current developments on fatigue life prediction methods have been systematically reviewed.In con- sideration of the irreversibility of energy dissipation during fatigue damage process,the main contents for fatigue damage estimation and localized equivalence as well as simulation models have been established.A frame of energy-based fatigue life prediction method has been proposed,meanwhile, the procedure in application to a practical structure component has been described.
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    Diffraction and Morphology Study of Surface Structures Accomponying with the Formation of α'Plate(Bainite)in a Cu-Zn-AI Alloy
    ZHU Min AN Jiangying CHEN Feixia WANG Fengting YANG Dazhi ** Dept.of Materials Engineering,Dalian University of Technology,Dalian,116023,China+ To whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (4): 273-278. 
    Abstract   HTML   PDF (2120KB)
    In the present paper the morphologies of sur- face structures and the anomalous contrast of β_1 phase accompanying with the formation of bainite plate in the Cu-Zn-Al shape memory alloy have been investigated in detail by the transmission elec- tron microscopy and diffraction.The experimental results have proved that the extra diffraction and anomalous contrast results from the surface martensite formed on the β_1 phase.However,the crystal structure and morphology of the surface martensite are varied at different stage of bainite formation.The observation of interfacial disloca- tion structure of bainite/β_1 matrix reveals that there is a large strain in the bainite transformation of β CuZnAl alloy.Based on the experiment results the formation of surface martensite and bainitic transformation were discussed.
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    Mathematical Model of Dynamic Operation and Optimum Control of Billet Reheating Furnace
    LIU Rixin NING Baolin ** Dept.of Metallurgy,Kunming Institute of Technology,Kunming,650093,China*** Dept.of Thermal Energy,Northeast University of Technology,Shenyang,110006,China+ To whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (4): 279-283. 
    Abstract   HTML   PDF (407KB)
    This paper provides a mathematical model for the billet reheating process in furnace.A new optimum method is brought up that the objective function is the integral value of enthalpy increasing process of a billet.Different delays are simulated and calculated,some proper delay strategies are ob- tained.The on-line computer control model is de- veloped.The real production conditions simulated, the temperature deviation of drop out billet from the target temperature is kept within±15℃.
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    Quantitative Mossbauer Study on Retained Austenite and Carbide in High Speed Steel
    ZHANG Henghua MA Ruzhang SU Shizhang CHANG Ruqin JIN Huijuan XU Guiqin ** Beijing University of Science and Technology,Beijing,100083,China*** Shanghai Iron and Steel Research Institute,Shanghai,200940,China+ To whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (4): 284-288. 
    Abstract   HTML   PDF (432KB)
    The retained austenite in high speed steel of two different heat treatment regimes was quantitatively,determined by transmission Mssbauer spectroscopy (TMS),backscattering X-ray geometry,Mossbauer spectroscopy (BXMS) and X-ray diffraction technique.The results meas- ured by these methods were in agreement with each other.It was demonstrated that the concentration of carbides in high speed steel could be measured by transmission Mossbauer spectroscopy or Mossbau- er spectroscopy in backscattering X-ray geometry accurately.
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    Relationship between Relaxation Internal Friction Peak at about 200℃(f≈1Hz)and Bainitic Transformation In a CuZnAl Alloy
    ZHAO Zengqi CHEN Feixia YANG Dazhi BAO Er ** Physical Laboratory,Baotou Research Institute of Rare Earth,Baotou,014010,China*** Dept.of Materials Engineering,Dalian University of Technology,Dalian,116024,China**** Dept.of Materials Engineering,Yanshan Uni
    J. Mater. Sci. Technol., 1992, 8 (4): 289-293. 
    Abstract   HTML   PDF (460KB)
    The present investigation showed that the re- laxation peak at about 200℃ (f≈1Hz) was related to bainitic transformation in a CuZnAl alloy.The peak decreased when bainite precipitated.The activation energy of the peak was the same as the apparent activation energy of bainitic transforma- tion.According to the relations between the peak and the bainitic transformation,the mechanism of the peak has been discussed.
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    Effects of B and Ti on the Toughness of HSLA Steel Weld Metals
    SI Zhongyao WANG Zhaoqing LIU Peng YU Dehua LIU Lei ** Institute of Metal Research,Academia Sinica,Shenyang,110015,China*** Capital Iron and Steel Company,Beijing,100053,China+ To whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (4): 294-298. 
    Abstract   HTML   PDF (1153KB)
    Effects of microalloying Ti and B on the microstructures and low temperature toughness of manual metal arc (MMA) deposits were investi- gated.Weld metals containing 200-300 ppm Ti and 29-60 ppm B deposited by manual coated elec- trodes provided an optimum low temperature toughness.The addition of B in weld metals low- ered the γ→α transformation temperature which promoted the acicular ferrite (AF) transformation. Solid solutioned B suppressed grain boundary ferrite as well as side plate ferrite formation and benefited the acicular ferrite formation.Titanium protected B from oxidizing as well as nitriding and formed Ti-Mn silicate inclusions.Ultra-high volt- age electron microscope analyses showed that TiO structure in the Ti-Mn silicate inclusions was the favorable nucleation site for acicular ferrite forma- tion.
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    Influence of α Phase on Shape Memory Effect and Superelasticity of CuZnAI Alloy
    QI Min ZHU Min ZHAO Xu YANG Dazhi ** Dept.of Materials Engineering,Dalian University of Technology,Dalian,116023,China*** Institute of Metals Research,Academia Sinica,Shenyang,110015,China+ To whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (4): 299-304. 
    Abstract   HTML   PDF (1257KB)
    The influence of a small amount of α phase in β′ matrix on shape memory effect and superelasticity of CuZnAl shape memory alloy has been studied systematically.It has been found that transformation temperature can be adjusted in a large scale by controlling the amount of α phase, meanwhile,shape memory effect and superelasticity do not decrease obviously when there exists a small amount of α phase.Based on the optical and trans- mission electron microscopy observation,the influ- ence of α phase on shape memory effect and superelasticity has been discussed.
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    Solute Redistribution Model for Multicomponent AHoys during Rapid Solidification
    CHEN Kuiying LI Qingchun ** Dept.of Metals and Technology,Harbin Institute of Technology,Harbin,150006,China+ To whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (4): 305-306. 
    Abstract   HTML   PDF (163KB)
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    First Chinese Youth Symposium on Fatigue
    ZHONG Zhenchen
    J. Mater. Sci. Technol., 1992, 8 (4): 307-307. 
    Abstract   HTML   PDF (76KB)
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    Abstracts of Selected Articles on metals Published in China
    No Author
    J. Mater. Sci. Technol., 1992, 8 (4): 308-312. 
    Abstract   HTML   PDF (602KB)
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