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  • 2008 Volume 0 Issue 8
    Published: 20 August 2008
      

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  • XU Zun-ping, CHENG Nan-pu, CHEN Zhi-qian
    2008, 0(8): 1-4.
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    XU Zun-ping, CHENG Nan-pu, CHEN Zhi-qian. Mechanical Properties and Finite Element Simulation of Equal Channel Angular Pressing of 7050 Al Alloy[J]. Journal of Materials Engineering, 2008, 0(8): 1-4.

    With the help of finite element method,the effect of different process variables on the distribution of equivalent strain,deformation,extrusion load of 7050 Al alloy during the isothermal equal channel angular pressing was studied.Process variables considered friction factor,channel angle and punch velocity.The results showed that the equivalent strain and extrusion load were greatly affected by the friction factor and channel angle,the punch velocity had little effect on the equivalent strain and extrusion load.The equivalent strain and extrusion load increased with increasing friction factor,and with decreasing channel angle.Experiments discovered that the ultimate strength increased with increasing extrusion passes,and then changed little with extrusion passes after by 4 passes,ultimate strength increased with decreasing channel angle.Elongation decreased greatly after by 1 pass,and then increased little with increasing extrusion passes.
  • ZHAO Guo-xian, LÜ Xiang-hong, HAN Yong
    2008, 0(8): 5-8.
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    ZHAO Guo-xian, LÜ Xiang-hong, HAN Yong. Effect of Flow Rate on CO2 Corrosion Behavior of P110 Steel[J]. Journal of Materials Engineering, 2008, 0(8): 5-8.

    Influences of flow rate on CO2 corrosion behavior of P110 steel were studied in simulated environments.Morphologies and thickness of scales at different flow rate were analyzed by SEM technology.The results showed that maximal corrosion rate presented at 1.5m/s.Increasing flow rate promoted mass and charge transfer of corrosive factors,accelerated the corrosion reaction.But morphologies and microstructure of corrosion products layer changed,resulting in thinner and more compact corrosion product layer,impeding the diffuse process for mass and charge transfer through it.
  • LI Chang-qing, HU Ming, YANG Hai-bo
    2008, 0(8): 9-12.
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    LI Chang-qing, HU Ming, YANG Hai-bo. Study on Performance of Porous Silicon Used in Thermal Isolation Layer of Micro Thermal Sensor[J]. Journal of Materials Engineering, 2008, 0(8): 9-12.

    Using the electrochemical method porous silicon was prepared,thermal conductivity and residual stress of porous silicon were scaled by Micro-Raman Spectroscopy(MRS).Using MTS nano indenter XP,the average value of hardness &Young’s modulus of porous silicon were measured.The relationship between micro structural parameter and its property of mechanical and thermal insulation were researched,The PS had excellent property of thermal insulation and mechanical can be prepared by control conditions,and it can be used in thermal isolation layer of micro thermal sensor.
  • MO Ji-liang, CHEN Long, ZHU Min-hao
    2008, 0(8): 13-16.
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    MO Ji-liang, CHEN Long, ZHU Min-hao. Friction and Wear Properties of WC/C Solid Lubricant Coating[J]. Journal of Materials Engineering, 2008, 0(8): 13-16.

    WC/C solid lubricant coating was prepared by Physical Vapor Deposition(PVD) technique.The friction and wear properties of the WC/C coating sliding against Si3N4 ceramic ball and titanium ball were investigated by using CETR UMT-2 micro-tribometer in a ball-on-disc configuration.The worn surfaces of the coating and counterparts were evaluated by Optical Microscope(OM),Scanning Electron Microscopy(SEM) and Energy Dispersive X-ray spectroscopy(EDX),and the wear mechanism of the coating was discussed consequently.The results showed that the sliding velocity had great influence on the friction properties of the WC/C coating,and a relatively lower sliding velocity was of benefit to forming dense and continuous transferred films on the two counterparts.The wear damage of the WC/C coating was characterized by a combination of delamination and oxidative wear when sliding against Si3N4 ball,and by a combination of ultra-mild abrasive and oxidative wear when sliding against titanium ball.The WC/C coating exhibited good anti-adhesion properties against titanium.
  • XU Rui-dong, WANG Jun-li, GUO Zhong-cheng, WANG Hua
    2008, 0(8): 17-21,72.
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    XU Rui-dong, WANG Jun-li, GUO Zhong-cheng, WANG Hua. Influence of Process Parameters on Microstructure and Properties of Ni-W-P-CeO2-SiO2 Nano-composite Films[J]. Journal of Materials Engineering, 2008, 0(8): 17-21,72.

    Ni-W-P-CeO2-SiO2 nano-composite films were prepared on the carbon steel surface by pulse co-deposition of Ni,W,P,nano-CeO2 and nano-SiO2 particles,the influence of pH value and temperature of electrolyte on the electrodeposition process was researched,the characteristics were assessed by chemical composition,deposition rare,microhardness and microstructures.The results indicated that increasing pH value and temperature of electrolyte led to refinement in grain structure,the increase in deposition rate and microhardness.When the pH value and temperature of electrolyte were controlled 5.5 and 60℃ respectively,the nano-composite films possessed fine crystal size,the deposition rate of 28.87μm/h and the microhardness of Hv 673 were obtained.But the deposition rate and microhardness began to decrease if the pH value and temperature of electrolyte were increased further.
  • BA De-ma, MA Shi-ning, LI Chang-qing
    2008, 0(8): 22-25,30.
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    BA De-ma, MA Shi-ning, LI Chang-qing. Thermal Stability of Nanocrystallite in Surface Layer of Cr-Si Alloy Steel[J]. Journal of Materials Engineering, 2008, 0(8): 22-25,30.

    A nanocrystalline surface layer was fabricated on a chrome-silicon alloy steel using Supersonic Fine Particles Bombardment(SFPB).The grain size of the top nanocrystalline layer was about 16 nm.The microstructural evolution of the top nanostructured layer after isothermal annealing was characterized by using X-Ray Diffraction(XRD) and Transmission Electron Microscopy(TEM).Experimental evidence showed,as annealing temperature was lower than 450℃,a slight grain growth occurred in the top surface layer;as annealing temperature reached to 450℃,the grain grew sharply up to about 100nm due to loss of stabilization of the size.Experimental analysis indicated that the nanocrystallites in the surface layer of Cr-Si alloy steel was thermally stable under 450℃.The thermal stability of the nanocrystalline surface layer attributed to intrinsic structure,dynamic recovery of structure and cementite particles impending motion of grain-boundary during annealing treatment.
  • FU Chuan-long, MENG Ling-jie, LU Qing-hua
    2008, 0(8): 26-30.
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    FU Chuan-long, MENG Ling-jie, LU Qing-hua. Preparation of Cellulose/SWNTs Complex Using Ionic Liquids as Solvent[J]. Journal of Materials Engineering, 2008, 0(8): 26-30.

    Water dissolved cellulose/SWNTs complex(C/S-C) was prepared via functionalization of SWNTs with cellulose dissolved in ionic liquid(\Br).The successful formation of C/S-C had been confirmed using a variety of methods including High-Resolution Transmission Electron Microscopy(HR-TEM),Field Emission Scanning Electron Microscopy(FE-SEM) and elemental linear profiles analysis.The thickness of cellulose layer on SWNTs was 2-4nm.The results of Raman spectroscopy further indicated that non-covalent interaction was the driving force to form C/S-C.
  • LIAO Shu-lun, ZHANG Li-wen, YUE Chong-xiang, PEI Ji-bin, GAO Hui-ju, JIA Yuan-wei, LIAO Xiao-jie
    2008, 0(8): 31-34.
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    LIAO Shu-lun, ZHANG Li-wen, YUE Chong-xiang, PEI Ji-bin, GAO Hui-ju, JIA Yuan-wei, LIAO Xiao-jie. Experimental Analysis and 3-D Simulation of Single Compression Tests of GCr15 Steel[J]. Journal of Materials Engineering, 2008, 0(8): 31-34.

    The single compression tests of GCr15 steel were performed on Gleeble-3800 thermal-mechanical simulator at 950-1150℃ and strain rates of 0.1-10s-1.The stress-strain curves, the models of peak-stress and dynamic microstructure evolution of the steel were obtained.Also,three-dimensional FE models were developed to investigate the compression processes under different deformation conditions with the aid of MSC.Marc software and its subroutine code.The proposed models were utilized to analyze the strain distribution of specimens as well as to evaluate the influence of process parameters on dynamic recrystallized fraction and the grain size.The results showed that the simulated results of grain size were in good agreement with the experimental values.
  • ZHANG Chi, ZENG Wei-dong, LI Xing-wu, SHA Ai-xue
    2008, 0(8): 35-39.
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    ZHANG Chi, ZENG Wei-dong, LI Xing-wu, SHA Ai-xue. Effect of Extrusion Parameters on Cold Extrusion Process of TC16 Titanium Alloy Fastener[J]. Journal of Materials Engineering, 2008, 0(8): 35-39.

    A new parameter,namely concavity,was proposed for cold extrusion process of titanium alloy fastener to describe the degree of concavity in the front of the workpiece.With the help of the DEFORM-3D,the elastic-plastic finite element method was used to carry out the numerical simulation research on the cold extrusion process of the fastener with different extrusion parameters(such as extrusion speed,half cone angle of female die).The change of the extrusion load,distribution of temperature fields,average temperature rise and the concavity were obtained.It provided a theoretic reference to optimize the extrusion parameters on TC16 fastener cold extrusion.
  • HAN Mei, LUO Yu-shi
    2008, 0(8): 40-43.
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    HAN Mei, LUO Yu-shi. Effects of HIP on Microstructures and Properties of DD3 Single Crystal Superalloys[J]. Journal of Materials Engineering, 2008, 0(8): 40-43.

    Two HIP(Hot Isostatic Press) processes were applied to investigate the effect on microstructures and properties of DD3 single crystal superalloys.The microstructures after HIP and HIP with standard heat treatment were observed with OP and SEM.Tensile strength,stress rupture and creep properties of DD3 after HIP and standard heat treatment were tested.The results showed that the HIP can eliminate casting microporosity but degraded the stress rupture and creep properties.The γ′ precipitates in the matrix changed their shape from cuboidal to round one along with the changes in size due to the HIP.Which may have a detrimental effect on the stress rupture and creep properties.
  • ZHANG Yan, SONG Yu-su-WAOG Yuan-sheng
    2008, 0(8): 44-47.
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    ZHANG Yan, SONG Yu-su-WAOG Yuan-sheng. Preparation of AgCl Nanopowders by Solid-phase Reaction at Room Temperature[J]. Journal of Materials Engineering, 2008, 0(8): 44-47.

    AgCl nanopowders were prepared by improved solid state reactions at room temperature with dispersant wrapping the production.Characteristics of the nanomaterials were characterized by TEM and XRD.The results showed that the particle sizes of AgCl were about 20nm with the shape of sphericity and the configuration of cubic crystal.The AgCl powders had smaller sizes and its distribution was more identical than the ones prepared by traditional method.
  • HAN Zhi-cheng, WANG Shao-gang, HU Jing-hong, XU Feng-lin
    2008, 0(8): 48-51,56.
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    HAN Zhi-cheng, WANG Shao-gang, HU Jing-hong, XU Feng-lin. Effect of Welding Process Parameters on Structure and Property of 2205 Duplex Stainless Steel Weld Joint[J]. Journal of Materials Engineering, 2008, 0(8): 48-51,56.

    When welding thermal cycle was controlled effectively by optimizing welding technology,the ideal microstructure and phase proportion can be obtained in the weld joint.According to the characteristics of 2205 duplex stainless steel,the mechanical properties of the weld joint were tested with tensile machine,and the joint microstructure was analyzed by using scanning electron microscope and optical microscope.The results showed that the higher strength can be obtained with the welded joint by using mixed gas(argon +2.5%nitrogen,volume fraction) tungsten arc welding.The analysis of microstructure illustrates that the weld joint had almost the same phase structure and similar phase proportion as that of base material.
  • WANG Hong-xing, SHENG Xiao-bo, CHU Cheng-lin, DONG Yin-sheng, LIN Ping-hua
    2008, 0(8): 52-56.
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    WANG Hong-xing, SHENG Xiao-bo, CHU Cheng-lin, DONG Yin-sheng, LIN Ping-hua. Influences of Slurry Pack Cementation Time on Microstructure and Properties of Ni-Al Coating on Cu Substrate[J]. Journal of Materials Engineering, 2008, 0(8): 52-56.

    The surface of the electro-deposited nickel layer on Cu substrate was aluminized by a slurry pack cementation process.The influences of slurry pack cementation time on the composition,microstructure,thickness and microhardness of the aluminized coatings as well as the diffusion coefficient of Al atoms were studied.The experimental results showed that a single-phase Ni2Al3 intermetallic compound coating wa prepared on the Ni layer after active aluminizing.With increasing the aluminizing holding time,Ni content in Ni2Al3 coating increased while Al content decreased.At the same time,the grain size and thickness of Ni2Al3 layer increased,while the diffusion coefficient of Al atoms in Ni2Al3 coating decreased and the microhardness of Ni2Al3 coating decreased firstly and then increases.
  • LEI Li-ming, HUANG Xu, DUAN Rui, CAO Chun-xiao
    2008, 0(8): 57-60.
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    LEI Li-ming, HUANG Xu, DUAN Rui, CAO Chun-xiao. Finite Element Simulation of Effect of Outer Corner Angle on Deformation of Equal Channel Angular Extrusion with 60° Die Channel Angle[J]. Journal of Materials Engineering, 2008, 0(8): 57-60.

    Finite element simulations were carried out to analyze the effects of different outer corner angles Ψ(0,30,60,120°) on the deformation of equal channel angular extrusion of high pure Al with 60°die channel angle under frictionless condition.The results showed that with the increasing of Ψ angle,corner gaps decreased while the top gaps in the outlet channel increased.At the same time,the larger Ψ angle increased the upward bending of the specimen head and resulted in the larger bottom gaps in the outlet channel.Ψ angle had a greater effect on the bottom equivalent plastic strain in the steady-state region compared with the top that.In addition,extrusion load decreased obviously with the increasing of Ψ angle.
  • WU Jian-min, XU Jia-wen, WU Rui
    2008, 0(8): 61-63,68.
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    WU Jian-min, XU Jia-wen, WU Rui. Technical Experimental Study of Aluminum Alloy in Electrochemical Machining[J]. Journal of Materials Engineering, 2008, 0(8): 61-63,68.

    The basic technical characteristics of ECM(Electrochemical Machining) about aluminum alloy were researched.These factors affecting electrochemical machining were analyzed.From the orthogonal experiment,the influence degree of machining voltage,electrolyte temperature and feed speed of workpiece on Equilibrium Inter-Electrode(EIE) gap were studied.The results indicated that machining voltage and feed speed exerted evident effect on EIE gap.And furthermore,practical volume electrochemical equivalent ηω in steady state machining,which was one of the important parameters of ECM,was calculated from experimental results.
  • FENG Chang-jie, DU Nan, LI Xiao-gang
    2008, 0(8): 64-68.
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    FENG Chang-jie, DU Nan, LI Xiao-gang. Monitoring of Corrosion Depth of A3 Steel in H2SO4 Solution by Continuously Measuring its Resistance or Sheet Resistance[J]. Journal of Materials Engineering, 2008, 0(8): 64-68.

    The corrosion depths of A3 steel bar and plate in 0.1M/L and 0.5M/L H2SO4 solutions were investigated by measuring their mass loss,resistance or sheet resistance changes,respectively.The results showed that the A3 steel corrosion depths resulted from mass loss were greatly consistent with those calculated from resistance or sheet resistance changes.Within the range of 7.07μm,the maximum and average differences of corrosion depths obtained from mass and resistance changes for A3 steel bar in the above solutions were 0.90μm and 0.70μm respectively,and those for the A3 steel plate from mass and sheet resistance changes were 0.75μm and 0.42μm.Compared with the data of measured resistances of A3 steel bar in 0.1M/L and 0.5M/L H2SO4 solutions,the sheet resistances monitored of A3 steel plate in the same solutions were less scattered and their corresponding calculated corrosion depths were closer to those acquired from mass changes.
  • ZHANG Zeng-zhi, YANG Chun-wei, NIU Jun-jie
    2008, 0(8): 69-72.
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    ZHANG Zeng-zhi, YANG Chun-wei, NIU Jun-jie. Preparation and Characterization of Carbon Pillared Clay[J]. Journal of Materials Engineering, 2008, 0(8): 69-72.

    Carbon pillared clay was prepared from bentonite modified by C19H42BrN and C10H16CIN and then characterized.Surface morphology of the sample was observed by Scanning Electron Microscope(SEM),the bore properties including the ratio surface,bore structure and bore path distribute of material were analyzed by ASAP2020 model test instrument of surface area and pore width,slice layer structure of carbon pillar clay was studied by Japanese D/PC MAX-2200 diffraction instrument.The DSC and TG curvs of carbon pillared clay were analyzed.The results indicated that the micro feature of carbon pillared clay were needle slice,the average bore diameter decreased,and the ratio surface enlarged,the mainly structure of carbon pillared clay was two-dimensional aperture formed by carbonized large particles,the hot stability of organic clay can be significantly improved with heat treatment.
  • ZHAO Jin-qian, LI Jia-rong, LIU Shi-zhong, YUAN Hai-long
    2008, 0(8): 73-76.
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    ZHAO Jin-qian, LI Jia-rong, LIU Shi-zhong, YUAN Hai-long. Effects of Low Angle Grain Boundaries on Tensile Properties of Single Crystal Superalloy DD6[J]. Journal of Materials Engineering, 2008, 0(8): 73-76.

    At 800,850,900℃ and 950℃,effects of Low Angle grain Boundaries(LABs) on the tensile properties of the second generation single crystal superalloy DD6 were investigated,and the test specimens were prepared by using two seeds.LABs had more influence on the elongation of the alloy.At 850℃,the elongation of the alloy with LABs was the highest,and the decreasing tendency of elongation was obvious with temperature increasing at the temperature higher than 850℃.The effect of LABs on the strength was less,and the strengths were comparative with each other at the condition of the same temperature except the specimen with the misorientation higher than about 9°.Decrease in tensile property results from that the strength of LABs decreased with temperature or misorientation increasing so that the LABs became a weak link.
  • WANG Dan, DONG Shi-yun, XU Bin-shi, CHEN Qun-zhi, DONG Li-hong
    2008, 0(8): 77-80.
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    WANG Dan, DONG Shi-yun, XU Bin-shi, CHEN Qun-zhi, DONG Li-hong. Metal Magnetic Memory Testing Signals of 45 Carbon Steel During Static Tension Process[J]. Journal of Materials Engineering, 2008, 0(8): 77-80.

    The variations of the magnetic intensity,Hp(y),on the direction perpendicular to the surface of 45 carbon steel tensile specimens with shaft-shaped geometry and three different dimensions were determined during the static tension testing by using the metal magnetic memory.The relationship between the tension stress σ and the absolute value of slope of Hp(y) curve |k| was investigated.In the full elastic range,experimental results showed that,when the dimension of the specimens was given,the magnitude of |k| increased with increasing the loading magnitude.However,near the yield limit in the plastic range,the slope reached a local maximum and then decreased.After abruption,an abrupt change in Hp(y) curve occurred near the fracture surface.When the dimensions of the specimens were different,the relationship between σ and |k| was significantly influenced by the length of the specimens.Results showed that with increasing of the specimen length,the magnitude of |k| decreased.
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