ISSN 0412-1961
CN 21-1139/TG
Started in 1956

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    , Volume 30 Issue 2 Previous Issue    Next Issue
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    DO_3→2H AND DO_3→18R TRANSFORMATIONS AND THEIR THERMODYNAMICS IN CuAlNi SINGLE CRYSTALS
    JIANG Qing (Department of Metal Material Engineering; Jilin University of Technology;Changchun)
    Acta Metall Sin, 1994, 30 (2): 49-54. 
    Abstract   PDF (446KB) ( 518 )
    Stress-induced DO_3→2H and DO_3→18R martensitic transformations of CuAlNi single crystal in a temperature range of M_s< T< A_f are studied in situ by use of an optical microscope. The temperature dependence of critical stresses and the transformation entropies are determined and compared with differential scanning calorimeter. The thermodynamic functions of DO_3→2H, DO_3→18R and 2H→18R transformations near 300 K are deduced. JIANG Qing, professor,(Department of Metal Material Engineering,Jilin University of Technology, Changchun 130025)
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    MECHANICAL PROPERTIES OF A1_(65)Cu_(20)Co_(15) QUASICRYSTAL
    MENG Xiangmin;TONG Baiyun;W U Yukun(Laboratory of Atomic Imaging of Solids and Laboratory of Rapidly Solidified No-Equilibrium Alloys; Institute of Metal Research;The Chinese Academy of Sciences;Shenyang)
    Acta Metall Sin, 1994, 30 (2): 61-64. 
    Abstract   PDF (291KB) ( 494 )
    The Vickers hardness of Al65Cu20Co15 quasicrystal before annealing was determined to be about 11 GPa. By measuring the length of the cracks near impression the toughness and the fracture strength were evaluated to be about 1.0 MPa·and 450 MPa,respectively.No obvious change of microhardness or toughness was found after 850℃, 36 h annealing.But the fracture strength rised to 550 MPa.MENG Xiangmin,(Institute of Metal Research,The Chinese Academy of Sciences,Shenyang 110015)
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    MODEL AND EXPERIMENTS ON FATIGUE SHORT CRACK GROWTH IN RESIDUAL STRESS FIELD
    CUI Zhenqi;XU Kewei; HU Naisai(National Laboratory for Mechanical Behaviour of Metallic Materials;xi'an Jiaotong University)
    Acta Metall Sin, 1994, 30 (2): 65-69. 
    Abstract   PDF (291KB) ( 726 )
    Discussion with experiments was carried out on the model for the effect of residual stress upon crack growth. A rather accurate calculation of crack growth rate in a compressive residual stress field may be made by the equation:The compressive residual stress not only increases the crack closure force but also decreases the maximum stress intensity factor.Both reduce the ΔK_(eff) value and the crack growth driving force, thus the crack growth rate is decreased.HU Naisai, professor,(National Laboratory for Mechanical Behaviour of Metallic Materials,Xi'an Jiaotong University, Xi'an, 710049)
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    APPLICATIONS OF d-ELECTRONS ALLOY DESIGN THEORY TO DEVELOPMENT OF HOT CORROSION RESISTANT Ni-BASE SINGLE CRYSTAL SUPERALLOYS Ⅲ. Characterization of Properties
    ZHANG Jishan; CUI Hua; HU Zhuangqi (Institute of Metal Rescarch; The Chinese Academy of Sciences;Shenyang); MURATA Y; MORINAGA M; YUKAWA N (Toyohashi University of Technology; Japan)
    Acta Metall Sin, 1994, 30 (2): 70-78. 
    Abstract   PDF (682KB) ( 584 )
    A study of the hot corrosion behaviour of the alloy system Ni-16Cr-9A1-2W-1Mo-4Co-Ti-Ta-Nb (in at. -%) selected by the d-electrons alloy design theory was conducted. At the same time, four experimental compositions were selected in the optimum compositional ranges to characterize the single crystal growth behaviour and properties.Finally, the compositions of an alloy with the desired balance of the comprehensive properties was determined as Ni-16Cr-gA1-2W-1Mo-4Co-3.125Ti-0.875Ta(at. - %). This alloy satisfies the alloy design requirements fairly good, i.c., it shows the hot corrosion resistance at the same or higher level of IN 738 LC, while the service temperature capability 70-90℃ higher than IN 738 LC. The stress rupture strength of this alloy reaches the level of the single crystal alloy CMSX-2 which contains much less Cr content, and is the highest among the current hot corrosion resistant nickel-base superalloys. The results of this study show the effectiveness and feasibility of applications of the d-electrons alloy design concept to the design and development of hot corrosion resistant nickel-base superalloys.ZHANG Jishan, associate professor,(Department of Materials Science and Engineering,Univeristy of Science and Technology Beijing, Beijing 100083)
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    STRESS CORROSION CRACKING OF 321 STAINLESS STEEL SINGLE CRYSTAL UNDER MODE Ⅱ LOADING
    QIAO Lijie;SHE Dongling; LIU Hui; CHU Wuyang; XIAO Jimei(University of Science and Technology Beijing)
    Acta Metall Sin, 1994, 30 (2): 79-84. 
    Abstract   PDF (459KB) ( 658 )
    SCC of 321 stainless steel(SS) single crystal was studied under mode II loading in a 42% boiling MgCl2 solution. The results shown that SCC initiated at the maximum normal stress site, while no SCC occurred at the maximum shear stress site. Although there were slip lines around the maximum normal site, most of SCC did not occur along the slip lines. Some micro-cracks could be observed on the slip lines using scanning electron microscope , but cracking direction was inclined about 20 degrees to the slip line and these microcracks did not propagate. The slip lines could appear owing to heat activation when a polished constant displacement specimen was heated at 150℃ for 2 h. The slip lines appeared during heating were polished before SCC experiment, SCC still initiated at the maximum site while no slip step emergence on the specimens. Those results are conflict with the″slip-dissolution ″ model of SCC. The SCC mechanism of austenitic stainless steel may be relative with the stress concentration due to dislocation pile-up, but not with slip steps. The normal stress plays an important part in the SCC.QIAO Lijie, associate professor,(Department of Materials Physics, University of Science and Technology Beijing, Beijing 100083)
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    STRESS CORROSION CRACKING AND HYDROGEN INDUCED CRACKING OF ORDERED B_2-TYPE Fe_3Al
    LIN Junpin;CHU Wuyang;XIAO Jimei(University of Science and Technology Beijing)
    Acta Metall Sin, 1994, 30 (2): 85-90. 
    Abstract   PDF (476KB) ( 680 )
    The behaviour of stress corrosion cracking (SCC) and hydrogen induced cracking (HIC) of ordered alloys Fe3Al and Fe3Al+Cr were investigated with WOL specimens. The threshold value KISCC and da/ dt value of SCC in water were higher than that of HIC. The addition of Cr in Fe3Al may increase the KIC, KISCC and KIH. The transition from hydrogen induced cleavage cracking to hydrogen induced intergranular cracking occurred with the decrease of KI and the fracture surfaces of SCC were cleavage, this is due to the higher KISCC. The theoretical explanation of above mentioned experimental results was discussed.LIN Junpin, associate professor,(Department of Materials Physics, University of Science and Technology Beijing, Beijing 100083)
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    EFFECT OF MICROSTRUCTURE AND ELEMENT DISTRIBUTION ON EROSION-CORROSION BEHAVIOUR OF AN IRON BASE CAST ALLOY
    WEI Xiangyun;ZHENG Yugui;ZHANG Yusheng;YAO Zhiming;ZHANG Yadong;ZHANG Shaopeng; KE Wei(Corrosion Science Laboratory;Institute of Corrosion and Protection of Metals; The Chinese Academy;of Sciences;Shenyang)
    Acta Metall Sin, 1994, 30 (2): 91-96. 
    Abstract   PDF (504KB) ( 528 )
    Effect of microstructure and element distribution of an iron base cast alloy Cr30Nil7Mo2Cu solidified at different rates upon the erosion-corrosion behaviour in flowing suspension of solid particles in strong acidic medium has been investigated by metallograph, XRD, EPMA and hardness tests. The results show that the resistance of the alloy with rapidly as-cast structure to erosion-corrosion is superior to aged one, although its hardness may be raised by aging treatment. The main reason why the rapid solidification of the alloy improves the erosion-corrosion resistance was also been discussed.WEI Xiangyun, associate professor,(Institute of Corrosion and Protection of Metals, The Chinese Academy of Sciences, Shenyang 110015
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