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ISSN 1005-0302
CN 21-1315/TG
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      28 March 1992, Volume 8 Issue 2 Previous Issue    Next Issue
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    Articles
    Effect of Pre-loading on Short Fatigue Crack Growth at a Notch
    XU Kewei HE Jiawen ZHOU Huijiu ** Research Institute for Strength of Metals,Xi'an Jiaotong University,Xi'an,710049,China+ To whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (2): 79-83. 
    Abstract   HTML   PDF (476KB)
    Results indicate that under cyclic tension the growth rate of short fatigue crack from notch root will be lowered greatly by tensile pre-loading,but only a little change by compressive pre-loading. The effect of tensile pre-loading will decrease with the increase of stress ratio.The variation of short fatigue crack growth rate is related to the residual stress distribution around notch root.
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    Characterization of ThMn_(12)-structure Stability
    By GENG Mingming MA Ruzhang XU Zuxiong WANG Genmiao ** Dept.of Material Physics,University of Science and Technology Beijing,Beijing,100083,China*** Structure and Element Analysis Lab.,University of Science and Technology of China,Hefei,230026,China+ To w
    J. Mater. Sci. Technol., 1992, 8 (2): 84-88. 
    Abstract   HTML   PDF (478KB)
    A series of YTi(Fe_(1-x)_(11)alloy with x=0.00,0.01,0.03,0.04,0.05,0.07 and 0.10 has been investigated by measurement of the structural properties and ~(57)Fe M(?)ssbauer experiments.The pure ThMn_(12)-structure phase exists at x≤0.03 and is absent at x>0.03.The reasons for lower satura- tion magnetization and lower energy product of the ThMn_(12)-structure compounds were given.The crystal structure relations between R_2Fe_(17)-structure and ThMn_(12)-structure were discussed.Comparing with the R_2Fe_(17)and R_2Fe_(14)B compounds,the ThMn_(12)-structure RFe_(12-x)M_x compounds have the same magnetic moment of Fe at x=0.The potential for increasing the saturation magnetization of ThMn_(12)-structure compounds may be enhanced by the addition of stabilization elements.
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    DirectionaHy Solidified High-strength Superalloy DZ22
    CHEN Rongzhang WANG Luobao WANG Yuping ** Institute of Aeronautical Materials,Beijing,100095,China+ To whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (2): 89-97. 
    Abstract   HTML   PDF (2023KB)
    Alloy DZ22 possesses rather high intermediate and elevated temperature mechanical properties comparable with the advanced commercial DS al- loy PWA1422.The alloy composition is based on PWA1422 alloy,only the content ranges of Hf,C and Zr are changed for systematic study.The pres- ent melting technology for master alloy ingot and DS process parameters for components are suitable for this alloy.The alloy revert which has been specially processed can be reused.The mould with- drawal rate during directional solidification affects the crystal orientation,alloy structure and the me- chanical properties of DS castings.The increment of solution-treatment temperature increases obvi- ously the longitudinal stress-rupture life at high temperature but decreases transversal one at inter- mediate temperature.The production practice in batches has demonstrated that alloy DZ22 has not only high mechanical properties but also excellent processing performance,including castability, weldability and machinability.It is indeed a favorable material for advanced aero and land gas turbine engine blades with complex inner cooling passage.
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    Preparation of AI-Ca Master Alloy by Electrolysis of Chloride-Fluoride Melts
    QIU Zhuxian SU Quanqing ** Dept.of Nonferrous Metals,Northeast University of Technology,Shenyang,110O06,China+ To whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (2): 98-102. 
    Abstract   HTML   PDF (364KB)
    Al-Ca master alloy was prepared in a labora- tory electrolysis cell.The operating parameters used were:temperature range 680-720℃,cathodic cur- rent density 0.76-1.10 A/cm~2,bath composition in wt-% 75-85 CaCl_2+2-5 KCl+2-5 CaF_2.Un- der optimal conditions the current efficiency reached 70-80% and the Ca-content 10-14 wt-%.
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    Stability of Phases in SiC and Si_3N_4 Whisker Formation
    CHEN Shengqi ZHOU Yanchun XIA Fei ** Institute of Metal Research,Academia Sinica,Shenyang,110015,China+ To whom correspondence should be addressed.
    J. Mater. Sci. Technol., 1992, 8 (2): 103-106. 
    Abstract   HTML   PDF (798KB)
    The stability of the phases in equilibrium is calculated and discussed in order to analyse and predict the reactions in SiC and Si_3N_4 whisker formation.Equilibria among SiC,Si_3N_4,Si_2N_2O,SiO_2 and the gas phase are evaluated at different C activity,N_2 pressure,and temperature.According to the phase stability diagrams,Si_3N_4 whisker was formed with the increase of N_2 pressure and decrease of C activity;SiC whisker was stable with the increase of C activity and decrease of N_2 pressure.In order to control the impure phases during the whisker formation,O_2 partial pressure is the most important factor.
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    Residual Stresses and Deformation Behaviour in a SiC_p/Al Composite
    SUN Zhengming LI Jiabao WANG Zhongguang LI Weijie ZHOU Yanchun ** State Key Lab.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 (2): 107-114. 
    Abstract   HTML   PDF (1437KB)
    Experiments were conducted to determine the residual stresses with X-ray diffraction in the ma- trix of a SiC/Al composite after different thermal treatments,and to investigate the stress-strain characteristics and fracture behaviour of the com- posite.It was found that there existed a tensile residual stress in the matrix and both thermal cy- cling between room temperature and 350℃ and low temperature treatment in liquid nitrogen reduced the residual stress.The results of the strength differential effect and Bauschinger effect were con- sistent with the results of residual stress measurements.The tensile residual stresses in the Al matrix enhanced the strength differential effect.The magnitude of Bauschinger effect is greater for a test initially started in compression than that in tension.
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    Kinetics of Oxidative Dearsenication of Niccolite Ore with Microwave Radiation
    TAO Dongping LIU Chunpeng ** Dept.of Metallurgy,Kunming Institute of Technology,Kunming,650093,China+ To whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (2): 115-118. 
    Abstract   HTML   PDF (316KB)
    The rate processes of oxidative dearsenication of niccolite ore in microwave oven and in conventional furnace were measured with thermogravimetric technique.The results show that the dearsenication rate of niccolite ore with microwave heating becomes faster than that with conventional heating. Under the conditions of an approximate linear heating and a definite air flow,the oxidative dearsenication process of niccolite ore is mainly controlled by interfacial chemical reaction.The ex- perimental data are in agreement with the kinetic model of linear heating as follows: In{[1-(1-α)~(1/3)]/T}= In (PAM)/(r_oρφE)(1-(RT)/E)-E/(RT) Thus the apparent activation energies of oxidative dearsenication of the niccolite ore containing differ- ent additions have been obtained from the model.
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    On Grain Size Dependence of Minimum Creep Rate
    LI Pei'en ** Institute of Materials Science and Engineering,Shanghai Jiaotong University,Shanghai 200030,China+ To whom correspondence should be addressed.
    J. Mater. Sci. Technol., 1992, 8 (2): 119-122. 
    Abstract   HTML   PDF (439KB)
    The available experimental results have been summarized concerning the effect of grain size on minimum creep rate.There are two types of creep rate-grain size relations.One is that there is a criti- cal grain size above which creep rate is independent of grain size,below which creep rate increases with the decrease of grain size.The other is that there is an intermediate grain size at which creep resistance is optimum.The first relation usually occurs at higher temperatures(>0.5 T_m),and intermediate stress ranges,while the second relation at interme- diate temperature ranges(0.4-0.5 T_m)and higher stresses.For the two types of creep rate-grain size relations,the increase of the creep rates with the de- crease of grain size for small grain sizes is all due to grain boundary sliding.For large grain sizes,a dis- location climb mechanism is dominant in creep deformation for the first relation,while a Hall-Perch grain boundary strengthening effect is believed to play an important role by dislocation glide mechanism for the second relation.
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    Role of Pits in Corrosion Fatigue of Offshore Structural Steel
    ZANG Qishan ZHOU Xiangyang LIU Kang KE Wei ** Institute of Metal Research,Academia Sinica,Shenyang,110015,China*** Institute of Corrosion and Protection of Metals,Academia Sinica,Shenyang,110015,China+ To whom correspondence should be addressed.
    J. Mater. Sci. Technol., 1992, 8 (2): 123-126. 
    Abstract   HTML   PDF (347KB)
    From the corrosion fatigue test under intermit- tent wetting condition for offshore structural steel of A537 cl.l and data analysis,some results associ- ated with the role of pits in fatigue process have been discussed.
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    Prediction of the Occurrence of a Phase in Austenitic Matrix of Ni-base Superalloys Using Thermodynamic Equilibria Calculation
    NI Kequan CHEN Guoliang ZHU Ping XIA Haiping ** Dept.of Materials Science & Engineering,University of Science and Technology Beijing,Beijing,100083,China*** Shenzhen Jinyuan Stainless Steel Co.Ltd.,Shenzhen.518067,China+ To whom correspondence should be a
    J. Mater. Sci. Technol., 1992, 8 (2): 127-131. 
    Abstract   HTML   PDF (462KB)
    Using the calculation of thermodynamic equilibria in multicomponent systems,two ternary phase diagrams,Ni-Cr-Mo and Ni-Cr-Co,have been calculated by optimizing the Gibbs free ener- gies with respect to phase diagrams and thermodynamic data.On the basis of this calcula- tion,the occurrence of σ-phase in the residual solid solution of commercial Ni-base superalloys, IN-713C and U-700,has been predicted.The re- sults show that the calculation of phase equilibria is successful in the prediction of the occurrence of the σ-phase.
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    Influence of Substitution of Transition Elements for Fe on the Structure and Magnetic Properties of the Nd_(16)Fe_(75)AI_2B_7 AHoy
    AI Lu LIU Guozheng SUN Tinglie LIAN Fazeng ZHANG Xiaoshi HE Kaiyuan ** Dept.of Materials Science and Engineering,Northeast University of Technology,Shenyang 110006,China+ To whom correspondence should he addressed
    J. Mater. Sci. Technol., 1992, 8 (2): 132-134. 
    Abstract   HTML   PDF (252KB)
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    Influence of the Preparative History on Physico-chemical Properties of Sodium Aluminate Solutions
    CHEN Nianyi LIU Miaoxiu YANG Jinxiu ** Shanghai Institute of Metallurgy,Academia Sinica,Shanghai,200050,China*** Laboratory of Theoretical Chemistry,Shanghai University of Science and Technology,Shanghai,200180,China+ To whom correspondence should be addr
    J. Mater. Sci. Technol., 1992, 8 (2): 135-137. 
    Abstract   HTML   PDF (244KB)
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    Kinetics of Oxidation Resistance of the Ti_3Al-base Intermetallic Alloys
    GUO Chaoqi YANG Bingguang MA Jiming ** Institute of Aeronautical Materials,Beijing,100095,China+ To whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (2): 138-140. 
    Abstract   HTML   PDF (444KB)
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    Growth of Diamond Film by Hot-filament CVD and Its Interface Research
    HUANG Rongfang CHEN Yan LI Daming GUANG Yiming WEN Lishi SHI Changxu ** Institute of Metal Research,Academia Sinica,Shenyang,110015,China+ To whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (2): 141-144. 
    Abstract   HTML   PDF (1021KB)
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    Precipitation of 8090 AI-Li Alloy during Overaging and Its Influence on the Recrystallization
    LIU Yulin ZHANG Yun ZHAO Hong'en HU Zhuangqi SHI Changxu ** Institute of Metal Research,Academia Sinica,Shenyang,110015,China+ To whom correspondence should be addressed.
    J. Mater. Sci. Technol., 1992, 8 (2): 145-148. 
    Abstract   HTML   PDF (1613KB)
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    Abstracts of Selected Artucles on metals Published in China
    No Author
    J. Mater. Sci. Technol., 1992, 8 (2): 149-156. 
    Abstract   HTML   PDF (1024KB)
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