Started in 1985 Semimonthly
ISSN 1005-0302
CN 21-1315/TG
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  Current Issue
      28 January 1989, Volume 5 Issue 1    Next Issue
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    Thermomechanical Fatigue Behaviour of a Nickel Base Superalloy
    LIANG Jin R. M. Pelloux XIE Xishan Univiersity of Science and Technology Beijing, (formely Beijing Univiersity of Iron and Steel Technology), 100083, China. MIT, Cambridge MA 02139 USA.
    J. Mater. Sci. Technol., 1989, 5 (1): 1-7. 
    Abstract   HTML   PDF (618KB)
    The isothermal low cycle fatigue (LCF) and thermomechanical fatigue (TMF) behaviour of a Ni-base superalloy was investigated. The results show that temperature plays an important role in both LCF and TMF. The alloy shows the lowest LCF fatigue resistance in the intermediate temperature range (~760℃). For strain-controlled TMF, in-phase (IP) cycling is more damaging than out-phase (OP) cycling. The high tempera- ture exposure in the TMF cycling influences the deformation behaviour at the low temperature. LCF lives at different temperatures, and IP and OP TMF lives are successfully correlated by using the hysteresis parameter Δσ·Δε_p.
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    Analyses of Adiabatic Shear in Some Metals from Calculations of the Temperature Distribution and the Cooling Rate
    CHEN Weizhong XU Zuyao WU Chen Shanghai Jiao Tong University, Shanghai, China.
    J. Mater. Sci. Technol., 1989, 5 (1): 8-13. 
    Abstract   HTML   PDF (524KB)
    The temperature distribution under shear with a high strain rate and the cooling rate of the shear bands of Al, Cu and 0.06C steel have been calculated using a computer. The results show that the temperature of shear band increases with the increase of the average strain rate (_o). When _o is in the range 8×10~5 to 10~6 1/s, the structure of the adiabatic shear band in a 0.06C steel is martensite but it becomes metallic glass if _o=10~6 1/s. As to A1 and Cu, the structure of the adiabatic shear bands can also be of metallic glass if _o is greater than 1.8×10~6 and 5.5×10~7 1/s respectively. It explains that Cu tends most difficultly to form adiabatic shear band, while 0.06C steel most readily among the three metals.
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    Influence of Solution Temperature on Microstructure and Mechanical Properties of Directionally Solidified Superalloy DZ22
    CHEN Rongzhang;WANG Luobao;WANG Yuping Institute of Aeronautical Materials, Beijing, PRC.
    J. Mater. Sci. Technol., 1989, 5 (1): 14-18. 
    Abstract   HTML   PDF (1396KB)
    The microstructure changed markedly with increasing solution temperature, i.e eutectic γ' phases and coarse primary γ' phase are redissolved continuously into matrix, which was finished at 1250-1260℃, and more and finer γ' phases are reprecipitated. The grain boundary morphology changed gradually to "fine line" form. The dendritic segregation of elements decreased. With raising solution temperature the longitudinal stress-rupture life at high and intermediate temperature were enhanced, but the transversal stress-rupture life at intermediate temperature decreased obviously. The incipient melting temperature of DZ22 alloy was measured to be 1230-1240℃ and may be increased by homogenization at 1150℃. In this paper the principle of determining solution temperature of DS alloys was discussed. It was suggested that the solution temperature of alloy DZ22 selected at 1200-1210℃ is appropri- ate.
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    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.
    J. Mater. Sci. Technol., 1989, 5 (1): 19-25. 
    Abstract   HTML   PDF (2174KB)
    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.
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    Preparation, Microstructure and Age Hardening of Rapidly Solidified Mo-alloys
    NING Yuantao;S. H. Whang Institute of Precious Metals, Kunming, Yunnan, China. Barnett Institute of Northeastern University, Boston, MA 02115, U. S. A.
    J. Mater. Sci. Technol., 1989, 5 (1): 26-32. 
    Abstract   HTML   PDF (1972KB)
    Various Mo-base alloys with high melting temperature were processed into ribbons and foils by the arc melt-spinning and the arc melt hammer-anvil technique. The preparation of ribbon and foil was introduced. The mechanical proper- ties, the surface topology and the microstructure of rapidly solidified Mo-base alloys containing B were examined. A strong grain refinement and a strong age-hardening response were observed on the as-quenched and the age specimens, the precipitates which cause age hardening were identified to be Mo_2B in Mo-B alloys, Mo_2B and ZrB_2 in Mo-Zr-B alloys, and Mo_2B and ThB_4 in Mo-Th-B alloys. The results indicate that the high strength Mo-base alloys containing boride precipitates can be developed by rapid solidifica- tion technique.
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    The Behavior of Rare Earths in Steel
    YU Jingsheng;YU Zongsen;WU Chengjian Ministry of Metallurgical Industry, China. Beijing University of Iron and Steel Technology.
    J. Mater. Sci. Technol., 1989, 5 (1): 33-43. 
    Abstract   HTML   PDF (1203KB)
    This review paper outlines recent progress in the application of rare earth metals (RE) in steel to improve the mechanical properties of steel. It includes: the physical chemistry of RE in steel; comparison of the application of RE and Ca in steel; the ways of adding RE into steel and nozzle blockage; the solid solubi- lity limit of RE in Fe and the amount of RE soluble in steel; the segregation of RE on grain boundaries of steel and its reaction with other elements; the effect of RE on the structure and mechanical properties of steels; the reaction of RE with H in steel.
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    A Crystallography Study of Bainitic Transformation in a Cu-Zn-Al Alloy
    AN Jiangying;ZHU Min;YANG Dazhi Department of Materials Engineering, Dalian Institute of Technology, China.
    J. Mater. Sci. Technol., 1989, 5 (1): 44-50. 
    Abstract   HTML   PDF (2625KB)
    The crystallographic nature of initial isothermal phase transformation in Cu-26Zn-4Al (wt-%) was investigated. The kinetic transforma- tion curve, morphology, crystal structure, substructure, orientation relationship and twin relationship of bainite plates have been studied by means of optical and transmission electron microscopy. The experimental results showed that the characteristics of initial 8→bainite transformation are not exactly consistent with that found in martensite transformation, for example, orientation relationship between matrix and bainite does not exist in martensite transformation.
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    The Application of Pattern Recognition to the Formability of Quasicrystal Formation in Al-alloys
    LUO Xuecai;CHENG Zhaonian;CHEN Nianyi;PAN Yugang Shanghai Institute of Metallurgy, Academia Sinica, China. Boston College, USA
    J. Mater. Sci. Technol., 1989, 5 (1): 51-52. 
    Abstract   HTML   PDF (140KB)
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    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.
    J. Mater. Sci. Technol., 1989, 5 (1): 53-54. 
    Abstract   HTML   PDF (357KB)
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    Internal Friction in a Shape Memory Alloy Cu-Zn-Al under Equilibrium Condition
    ZHAO Zengqi;CHEN Feixia;LI Ximeng;YANG Dazhi Dalian University of Technology, China.
    J. Mater. Sci. Technol., 1989, 5 (1): 55-58. 
    Abstract   HTML   PDF (668KB)
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    Luoyang Institute of Refractories Research Ministry of Metallurgical Industry
    ZHONG Xiangchong Luoyang Institute of Refractories Research, Luoyang, China.
    J. Mater. Sci. Technol., 1989, 5 (1): 59-61. 
    Abstract   HTML   PDF (837KB)
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    The International Symposium on Refractories
    ZHONG Xiangchong
    J. Mater. Sci. Technol., 1989, 5 (1): 62-63. 
    Abstract   HTML   PDF (197KB)
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    metals news
    No Author
    J. Mater. Sci. Technol., 1989, 5 (1): 64-68. 
    Abstract   HTML   PDF (575KB)
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    Alatiacts of Selected Aiticles on metal Published in China
    No Author
    J. Mater. Sci. Technol., 1989, 5 (1): 69-78. 
    Abstract   HTML   PDF (1217KB)
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