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Search Results: 1 - 10 of 6001 matches for " China Institute for Materials Research "
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EFFECT OF CATHODIC PROTECTION ON FRACTURE BEHAVIOUR OF LOWALLOY STEELS IN SEAWATER
ZHENG Wenlong ZHU Xiying SU Limin Shanghai Research Institute of Materials,Shanghai,China ZHENG Wenlong,Senior Research Engineer,Shanghai Research Institute of Materials,Handan Road,Shanghai,China,
ZHENG Wenlong ZHU Xiying SU Limin Shanghai Research Institute of Materials
,Shanghai,China ZHENG Wenlong,Senior Research Engineer,Shanghai Research Institute of Materials,Handan Road,Shanghai,China

金属学报(英文版) , 1989,
Abstract: Fracture behaviour of low-alloy steels AIST4340,HY100,Welten60,AISIA537 and A131 inartificial seawater under static,cyclic loading and at cathodic protection potential has beeninvestigated by using the techniques of fracture mechanics, electrochemistry andelectronfractography.The results reveal that at hydrogen evolution potentials(cathodic pro-tection potential)the critical yield strength required for the occurrance of SCC decreasesfrom 985 at corrosion potential(E_c)to 872 MPa.The effect of cathodic protection on crackpropagation of corrosion fatigue(CF)is not simple,it is closely related to the yield strengthof steels and their SCC behaviour.For the steels with high yield strength,cathodic protectionpromotes(da/dN)_Ⅱ evidently,and reduces △K_(th) value.The(da/dN)-△K curves dis-play a plateau at the third stage of CF for steels with medium or low yield strength.It is men-tioned that the cathodic protection potential for oceaneering constructures should be control-led at top level of the protective range.It seems reasonable that the strength of steel foroceaneeing use might be increased by 200 or 300 MPa.
A numerical method for analyzing multiple void-crack interaction in a plane elastic media
平面弹性介质多孔多裂纹问题的一种数值方法

Yan Xiangqiao Research Laboratory on Composite Materials,Harbin Institute of Technology,Harbin,China,
闫相桥

力学学报 , 2004,
Abstract: This paper presents an approach to modeling a general system containing multiple interacting cracks and voids in a plane elastic media. By extending Bueckner's principle suited for a crack to a general system containing multiple interacting cracks and voids, the original problem is divided into a homogeneous problem (the one without cracks and voids) subjected to remote loads and a multiple void-crack problem in an unloaded body with applied tractions on the surfaces of cracks and voids. Thus, the results in terms of stress intensity factors (SIFs) can be obtained by considering the latter problem, which is analyzed easily by means of the Hybrid Displacement Discontinuity Method (HDDM) proposed recently by the author. Many test examples are included to illustrate that the method is very simple and effective for analyzing arbitrary multiple cracks and voids in a plane elastic media.
RECRYSTALLIZATION-INDUCED PLASTICITY IN 18Ni MARAGING STEEL UNDER ELASTIC STRESS
YIN Zhongda Harbin Institute of Technology,Harbin,China ZHOU Yongkang Shanghai Centrifugal Machinery Research Institute,Shanghai,China YIN Zhongda Faculty of Heat Treatment of Materials,Harbin Institute of Technology,Harbin,China,
YIN Zhongda Harbin Institute of Technology
,Harbin,China ZHOU Yongkang Shanghai Centrifugal Machinery Research Institute,Shanghai,China YIN Zhongda Faculty of Heat Treatment of Materials,Harbin Institute of Technology,Harbin,China

金属学报(英文版) , 1990,
Abstract: An approach to study the recrystallization-induced plasticity(RIP)phenomenon in the 18Ni maraging steel under the elastic stress has been made by the analysis of dynamic behaviour at elevated temperatures,the phenomenological analysis of dynamic strain feature curves,the confirmation of phase transformation point and TEM observation of RIP processing itself.
EFFECT OF Zr ADDITION TO Ti-KILLED STEEL ON INCLUSION FORMATION AND MICROSTRUCTURAL EVOLUTION IN WELDING INDUCED COARSE-GRAINED HEAT AFFECTED ZONE

FChai~ CFYang HSu YQZhang Institute for Structural Materials,Central Iron,Steel Research Institute,Beijing,China ZXu School of Materials Science,Engineering,Shanghai Jiaotong University,Shanghai,China YHYang School of Materials Science,Engineering,Kunming University of Science,Technology,Kunming,China,

金属学报(英文版) , 2008,
Abstract: Effects of Zirconium on the chemical component and size distribution of Ti-bearing inclusions, favored the grain refinement of the welding induced, coarse-grained heat affected zone (CGHAZ) with enhanced impact toughness in Ti-killed steels, which were examined based on experimental observations and thermodynamic calculations.It indicated that the chemical constituents of inclusions gradually varied from the TiO oxide to the Ti-O+Zr-O compound oxide and a single phase of the ZrO2 oxide,as the Zr content increased from zero to 0.0100%. A trace of Zr (0.0030%-0.0080%,depending on the oxygen content in liquid steel) provided a large amount of nucleating core for Ti oxide because of the larger specific density of ZrO2 oxide, and produced a small size distribution of the inclusions favorable for aeieular ferrite transformation with a high nucleation rate in the CGHAZ, and a high volume fraction of aeicular ferrite was obtained in the CGHAZ, with enhanced impact toughness. Otherwise, a high content of Zr (~0.0100%) produced a single phase ZrO2, which was impotent to nucleate acicular ferrite, and a microstructure composed of ferrite side plate and grain boundary ferrite developed in the CGHAZ. The experimental results were confirmed by thermodynamic calculations.
SURFACE STATE AND CATALYTIC ACTIVITY OF ACTIVATED AMORPHOUS Fe_(80)Zr_(12)B_8 ALLOY
WANG Xike SHEN Ningfu CHEN Haisong Zhengzhou Institute of Technology,Zhengzhou,ChinaZHANG Haifeng Luoyang Research Institute for Ship Materials,Luoyang,ChinaGU Haicheng Xi''an Jiaotong University,Xi''an,China Professor,Research Centre for Materials,Zhengzhou Institute of Technology,Zhengzhou,China,
WANG Xike SHEN Ningfu CHEN Haisong Zhengzhou Institute of Technology
,Zhengzhou,ChinaZHANG Haifeng Luoyang Research Institute for Ship Materials,Luoyang,ChinaGU Haicheng Xi''''an Jiaotong University,Xi''''an,China Professor,Research Centre for Materials,Zhengzhou Institute of Technology,Zhengzhou,China

金属学报(英文版) , 1993,
Abstract: The depth profile of composition,chemical state of elements and morphology of as-received and activated amorphous Fe_(80)Zr_(12)B_8 alloy ribbons have been studied by meansof Auger electron spectroscopy,X-ray photoelectron spectroscopy and scanning Augermicroprobe combined with Ar ion bombardment.Both dull and free sides of the as-received ribbons were covered with an iron oxide layer.While a pronounced surfacesegregation and oxidation of B and precipitation of microcrystalline α-Fe particleswere observed on both sides of activated ribbons,B and Zr were oxidized selectivelyin subsurface layer.On both sides of ribbons,a porous surface structure formed. TheBET surface area was measured to be increasing from 0.11 to 2.68 m~2/g.The principalmechanism of in situ activation has been discussed.
Beryllium Surface Modified by B Ion Implantation
HU Renyuan YANG Yushi Institute of Low Energy Physics,Beijing Normal University,China Beijing Research Institute of Materials,Technology,China,
胡仁元
,杨玉石

材料科学技术学报 , 1989,
Abstract: Beryllium is implanted with 100 keV,2×10~(17) B/cm~2 and post-implanted sample isannealed at 650℃ for 1 h.Hardness measurementindicates that the hardness increases withimplantation and can further be modified bypost-implantation heat treatment.Profile measurement shows that implantationcauses contamination on the surface of beryllium.During annealing boron diffuses out of berylliumand carbon on surface diffuses into beryllium.Beryllium surface is modified by compositionchange and carbide formation.
Surface Reaction of TiAl with Water Vapor and Oxygen
Yexin CHEN,Xiaojing WAN,Weixin XU,
Yexin CHEN
,Xiaojing WAN and Weixin XU Institute of Materials,Shanghai University,Shanghai,China Shanghai Iron and Steel Research Institute,Shanghai,China

材料科学技术学报 , 2003,
Abstract: The interaction of water vapor and oxygen with TiAl-based alloy has been studied with Auger electron spectroscopy and X-ray photoelectron spectroscopy. The results indicate that both surface reactions initiate at a very short exposure water vapor reacts firstly with Al, and then reacts with Ti after certain exposure. The surface reaction of Al with water vapor may be responsible for the environmental embrittlement at room temperature in TiAl-based alloy.
ROUGHNESS-INDUCED SHEAR RESISTANCE OF MODE Ⅱ CRACK GROWTH
ZHENG Yesha WANG Zhongguang AI Suhua State Key Laboratory of Fatigue and Fracture for Materials,Institute of Metal Research,Academia Sinica,Shenyang,China postdoctor,Shanghai Institute of Ceramics,Academia Sinica,Shanghai,China
金属学报(英文版) , 1993,
Abstract: It is obtained in this paper that the fatigue threshold value of mode H was 1.9 times of that ofmode Ⅰ in dual-phase steel(DPS),and the normal stress intensity factor range oJ mode Ⅱbranch crack tip was 2.2 times of that of mode Ⅰ.Above results illustrate that the resistance ofmode Ⅱ crack growth was higher than that of mode Ⅰ,the former resulting fromroughness-induced shear resistance,the latter,crack closure.The mode Ⅱ component can play two important roles in near-threshold fatigue crackgrowth:(1)increasing crack tip plasticity which accelerates the crack growth and(2)intro-ducing crack surface contact and rubbing to reduce the crack propagation rate.By means ofcrack closure,the quantity of shear resistance was easily solved in this paper.The frictionshear stress strength factor range of mode Ⅱ,K_,is still much higher than the closure stressstrength factor range of mode Ⅰ,K_(Ⅰ,cl).This illustrated that the roughness enlarged the secondrole and played a role of shielding crack tip from mode Ⅱ crack.
EFFECT OF POWDER SIZE ON MICROSTRUCTURE AND PROPERTIES OF RAPIDLY SOLIDIFIED Al-Li-Mg-Zr ALLOY
YU Guifu Beijing Institute of Aeronautical Materials,Beijing,ChinaHE Junfang Institute of Metal Research,Academia Sinica,Shenyang,ChinaLI Qingchun Harbin Institute of Technology Harbin,China,
YU Guifu Beijing Institute of Aeronautical Materials
,Beijing,China HE Junfang Institute of Metal Research,Academia Sinica,Shenyang,China LI Qingchun Harbin Institute of Technology Harbin,China

金属学报(英文版) , 1992,
Abstract: The microstructure and properties of the rapidly solidified Al-Li-Mg-Zr alloy,in relation tothe particle size of supersonic atomizing powder,have been investigated.The finer the size andthe structure of powder,the higher the strength of the alloy.While the overfine powder mayworsen plasticity of the alloy.The proper powder seems to be sized 40—100um.
INFLUENCE OF RESIDUAL STRESS AND SURFACE MORPHOLOGY ON FATIGUE PROPERTIES OF STEEL 60Mn
KANG Zengqiao GAI Xiuying LI Jiabao WANG Zhongguang State Key Laboratory for Fatigue,Fracture of Materials Institute of Metal Research,Academia Sinica,Shenyang,China Research Assistant,
KANG Zengqiao GAI Xiuying LI Jiabao WANG Zhongguang State Key Laboratory for Fatigue and Fracture of Materials Institute of Metal Research
,Academia Sinica,Shenyang,China Research Assistant,Institute of Metal Research,Academia Sinica,Shenyang,China

金属学报(英文版) , 1992,
Abstract: Influence of residual stress and surface morphology induced by shot-peening on fatigue behav- ior of a medium temperature tempered spring steel 60 Mn has been studied.The compressive residual stress induced in the near-surface region may improve fatigue limit from 930 to 1010 MPa,and the very high tensile residual stress in the interior may reduce it from 1010 to 940 MPa,whereas the severe surface damage may cause a drop-off of it from 1010 down to 800 MPa.Fatigue cracks initiated in such position where the equivalent Mises stress,including residual stress,exceeded the local strength of the material.The compressive residual stress, induced by shot-peening,may intensify the effect of crack closure,so as to decrease the crack growth rate.
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