bluuebunny/crossref_metadata_2025 huggingface dataset:
Design and Implementation of Dam Safety Monitoring and Management System
Authors: Liu Ming Hui
Published: March 2013

The dam safety monitoring is the key factor to evaluate the operating status of the dam and ensure its normal operation. To improve the efficiency and accuracy of dam safety monitoring, it is necessary to develop a set of practical security software for monitoring and management. This paper discusses the practical significance of dam safety supervisory managerial system, the existing problems as well as the related solutions. Meanwhile, this paper also comes up with the design and implementation program against this background, which achieves the dam safety monitoring data’s efficient acquisition, data accuracy and rapid data query, as well as the graphical features of data analysis results.
Development of Non Contact Torque Sensor Applied to Wind Generator
Authors: Ju Dong Ying , Tabata Kazuaki
Published: March 2013

In order to solve the variable speed control as non-linear in wind energy application, it is important to obtain wind energy efficiently. And it is also effective in suppressing output fluctuation. Therefore, it will become a main torque system in the wind generation. The main object of this paper is to present a developed non-contact torque sensor for applying of non-linear control in the wind generator. In this paper, it examines whether efficient torque measurement of output shaft in the wind generation would be maintainable by non-linear control methods.
Microstructure and Mechanical Property of the Directionally Solidified NiAl-Cr(Mo)-Hf/Ho Alloy
Authors: Han Ping , Qi Yi Hui , Meng Juan , Guo Jian Ting
Published: March 2013

The microstructure and mechanical property of directionally solidified NiAl-Cr(Mo)-Hf/Ho alloy were studied. The results indicate that the alloy is composed of NiAl matrix and Cr(Mo) phase, the dispersion of Hf is identical with the NiAl matrix, and at the cell boundary, the dispersion of Ho is disperse. As the pull speed increase from 8mm/min to 15mm/min, the size of eutectic cell decreases, the lamellar size descends, too. After the homogenization heat treatment at 1473K for 20h, the size of eutectic cell increases, and the second phase precipitates, the hardness of the alloy decreases.
The Precipitation Behavior of γ' Phase in Superalloy FGH96 during Continuous Solution Cooling Conditions
Authors: Liu H.S. , Zhang Lin , He Xin Bo , Qu Xuan Hui , Li Zhou , Zhang Guo Qing
Published: March 2013

The precipitation behavior of γ' phase after continuous solution cooling tests was examined in superalloy FGH96. The results indicate that, with the increase of cooling rate, the mean diameter of secondary γ' precipitates decreases as well as the shape changes from cuboid to spherical. Either under water cooling or cooling at 10 °C/min and 25 °C/min, the highest strength can not be obtained.
Microstructure and Growth Behavior of the Intermetallic Compound for Sn-1.0Ag-0.5Cu-NiB/Cu Solder Joint Interface
Authors: Qu Jun Feng , Xu Jun , Hu Qiang , Zhang Fu Wen
Published: March 2013

This research investigates the microstructure and growth behavior of the intermetallic compound(IMC) of Sn-1.0Ag-0.5Cu,Sn-1.0Ag-0.5Cu-0.05Ni and Sn-1.0Ag-0.5Cu-0.05N-0.02B/Cu solder joint interface. The interfacial reactions between Cu and the solders at 250±1°C were examined. Experimental results indicated that the IMCs of the above alloy systems on the soldering interface were Cu6Sn5 and (Cux, Ni1-x)6Sn5, respectively. The grain size of primary Sn decreased observably with the micro addition of B and a large number of fine reinforcement particles were found in the solder. With the aging time increasing, the (Cux, Ni1-x)6Sn5 micrograph of the Sn-1.0Ag-0.5Cu-0.05N-0.02B solder joint interface was changed from sawtooth-like to shape-layer, but the thickness of IMCs increased unobservably.
Research on Multiple Plastic Deformations of Ultra-High Strength Aluminium Alloy
Authors: Cui Ya , Zhang Zhi Min , Yu Jian Min , Wang Qiang
Published: March 2013

Research on multipass plastic deformation of 7A04 ultra-high strength aluminium alloy by isothermal compression experiments on the 6300KN extrusion press. Experiment results show that elongation reaches its maximal value 9.25% after the first deformation. It is obvious that fibrous tissues appeared along the metal flow direction in the deformed 7A04 ultra-high aluminium alloy, with heterogeneous distribution of precipitated η (MgZn2) phase in the matrix, which results in lower strength (Rm=335MPa, Re=212.5MPa). As the times of deformation increases, precipitated phases grow gradually and the plasticity of alloys decreases dramatically, which reaches its minimal value 5.17% after the fourth deformation. With η(MgZn2) phase disperses gradually, the strength of the alloy increases gradually, and reaches its maximal value 386.7MPa after the fourth deformations. It is proved that 7A04 high-strength aluminium alloy has better synthetic mechanical properties after four times deformation.
Efficiency in the Extraction of Pure Silicon from Al-Si Alloy Melts by a Combined Process of Solvent Refining and Centrifugation for Solar Silicon Feedstock
Authors: Kim Ki Young , Cho Ju Young , Seo Kum Hee
Published: March 2013

Solvent refining of silicon from Al-Si melts assisted by a centrifugation was investigated for three alloys in the Al-Si system. Silicon was successfully separated from aluminum-rich phase in the form of a foam by centrifugation. As the silicon content increased, the recovery decreased because less aluminum-rich phases remained in the silicon foam. The weight ratio before and after acid leaching of the silicon foam was inversely related to its apparent density before acid leaching. The purity of the extracted silicon decreased slightly with increased silicon content. The purity of the silicon flakes obtained from the Al - 30% Si alloy was 4N, except aluminum. Boron and phosphorus in the silicon flakes could be lowered effectively by decreasing the silicon content in the Al-Si alloys
Manufacture, Structure and Properties of Copper Foams
Authors: Zhou Yun , Hong Zeng Chuan , Ai Xiang Ping , Zuo Xiao Qing
Published: March 2013

The raw materials used for manufacturing copper foams are the metal and a carbonate in powder form. Copper foams are fabricated by mixing metal and carbonate powder, sintering, and removing carbonate processing. The effect of Cu particle size, compacting pressure on the porosity of porous samples are analyzed. With SEM and EDS, particles binding and microstructure evolution during sintering are studied, and the mechanical properties of porous samples are measured. Results show that copper foams with the porosity of 60 % ~85 % are successfully prepared, pore size 50~1000㎛.The porosity of copper foams decreases with the pressure increasing and copper particle size decreasing at same volume fraction of copper powder . The compressive strength of copper foams decreases with the porosity raising, for the copper foam of 80% porosity, the compressive strength up to 20-30Mpa.The electrical conductivity of copper foams decreases with porosity increasing. Thermal expansion coefficient α of copper foams increases from 17 to 19*10-6 .K-1 when temperature rising from 50°C to 100°C.
Experimental Measurements of the Selected Properties of AeroTherm
Authors: Fabian Radek , Čmiel Filip , Jaroň Zdeněk , Kozakova Marketa
Published: March 2013

The thermally insulating compound AeroTherm appeared on the market in recent times. The manufacturer determines its thermal insulating properties. The aim of this article is to verify thermal-technical properties of AeroThermu on the lining from YTONG (autoclaved aerated concrete blocks) that serves as the supporting base.
Utilizing the Waste Polystyrene to Enhance the Thermal Insulation of the Local Buildings
Authors: AlQdah Khaled S. , AlGrafi Mubarak
Published: March 2013

In this investigation, waste polystyrene boxes were collected and treated before mixed with common concrete in especial dies to produce new brick called poly-brick. The main tests performed these tests include the measurement of thermal conductivity, overall heat transfer coefficient and the compression stress. It can be seen that the thermal conductivity of the poly-brick increased with increasing the percentage of waste polystyrene and vary from 0.78 (W/mk) at 0% Polystyrene to 0.227 (W/mk) at 50% and the overall heat transfer coefficient reduced from 7.85 to 2.77 W/m2k. Comparisons between common building structure versus the new Poly-Brick was made and it indicates that the heat transfer rate reduced from 1413 to 498.6 Watt at 50% ratio of the mixture which means 64.7% of energy saving. On the other hand, the compression stress found to be less than that for the common brick. Reduction in energy consumption, which means that low cost of heating and cooling needs, safer, clean and comfortable environment achieved. It is also leads to getting rid of the waste material and has resolved numerous design challenges such as mould.
Use of Sugarcane Bagasse Ash as Raw Material in Production of Autoclaved Lightweight Concrete
Authors: Apiwaranuwat Arkarin , Kitratporn Preung , Chuangcham Kannaree , Punmatharith Thantip
Published: March 2013

Sugarcane bagasse ash (ScBA) obtained as a byproduct of sugar processing may be used as a raw material for producing autoclaved lightweight concrete (ALC). We examined the chemical composition and physical properties of ScBA and determined that the material is not hazardous as defined by the Thai Ministry of Industry. The optimal production conditions for ScBA-containing ALC were a cement/sand ratio of 65/36, a water/total composition ratio of 0.24, and a curing time of 16 h. Maximum compressive strength was obtained in samples containing 20 wt% ScBA.
Ultrasonic Nondestructive Evaluation of Composite Components Using Advanced Total Focusing Method
Authors: Xu Na , Li Yang , Zhou Zheng Gan
Published: March 2013

The application of ultrasonic phased array has been increasingly common in nondestructive testing and evaluation of composite components. An advanced post-processing imaging algorithm of ultrasonic array, termed total focusing method, is introduced to improve imaging quality and detection ability. Then, the experiment system is developed to capture and store the time domain signals from every transmitter-receiver pair. This imaging algorithm is implemented to detect standard phased array sample and shown to offer increased sensitivity to small defects and greater inspection coverage. Finally, experiments are carried out for composite components. The results show this approach has significant performance advantages for nondestructive testing of composite components.
Stress Analysis of Perforated Plate Based on ANSYS
Authors: Mei Ying , Li Mei , Song Jie , Gao Xiao Xue
Published: March 2013

Based on nonlinear FEA software ANSYS, 3D simulation models of eighteen-type perforated plate that have different open-pore number was established. Analysis results indicate: Maximum equivalent stress of perforated plate mainly takes place on symmetry center of outer open-pore for open-pore area. With increasing open-pore number, maximum equivalent stress and each-direction maximum stress of perforated plate presents to enlarge trend. When open-pore number less than or equal to twelve, value of maximum equivalent stress mainly is decided by Z-direction maximum stress. When open-pore number greater than twelve, value of maximum equivalent stress mainly is decided by Y-direction maximum stress. When ratio m less than 2, with increasing ratio m, maximum equivalent stress and each-direction maximum stress of perforated plate presents to reduce trend. When X-direction and Y-direction open-pore numbe of perforated plate is basically equilibrium distribution, X -direction maximum stress is about equle to half of maximum equivalent stress.
Dry Sliding Friction and Wear Behavior of Surface Hardened Ferrous PM Cam Materials for Automobile Applications
Authors: Li Yue Ying , Deng Qi Chao , Shi Ping , Qiao Zhen Liang
Published: March 2013

Two kinds of surface heat treatment (wide-band laser surface quenching and high-frequency induction quenching) had been performed on a ferrous PM cam material for automobile applications. Microstructure, hardness and tribological properties of ferrous PM cam materials were investigated. After laser surface quenching, the sintered cam materials could obtain finer martensite microstructure and higher hardness value, compared to high-frequency induction quenching. Wear tests revealed the superior wear resistance and coefficient of friction of laser surface hardened specimens in comparison with high-frequency induction quenched ones. Laser surface quenching can be a more effective surface heat treatment to improve wear resistance of the sintered cam materials than high-frequency induction quenching. On the lower test loads (such as 50N), the wear mechanism of the surface quenched ferrous PM cam materials is dominated adhesive and abrasive wear, while on the higher test loads (such as 120N and 150N), it is primarily delamination wear and abrasive wear.
Segmented Optimization Design of Aluminum Alloy Goal Crossbar Based on FEM
Authors: Liu Peng , You Dong Dong , Zhou Wei Ming
Published: March 2013

Aluminum alloy goal crossbar (crossbar for short) as an essential part of soccer goals, according to practical needs, needs to be designed in other ways. So the segmented optimization design of crossbar has been proposed.This paper proposes that cut off crossbar from the middle first, then use an iron core turning the segmented crossbar into a whole part again when used. By means of parametric modeling in AutoCAD and SolidWorks and finite element analysis in MARC, the feasibility of the optimization design has been demonstrated. Finally, the paper comes to a conclusion via the way of experimental test.
Dissolution and Regeneration of Reed Leaf Fibers in Imidazole-Based Ionic Liquids
Authors: Zhao Hou Jie , Wei Chun Yan , Cui Yong Zhu , Lv Li Hua , Wang Xiao
Published: March 2013

In this paper, regeneration of reed leaf fibers that have been degummed pretreatment in high temperature and pressure dissolved in 1-butyl-3-methylimidazolium chloride ionic liquids was studied. The samples containing 5% or 10%(wt/wt)reed leaf fibers in the ionic liquids, at 90°C for 7h.The dissolution process was viewed by polarizing microscope. Fourier-transform infrared spectroscopy(FT-IR) and X-ray diffraction were used to visualize the crystalline of reed leaf fiber transformed completely from cellulose I to cellulose Ⅱ after regenerated directly from 1-butyl-3-methylimidazolium chloride solution.
A Preliminary Investigation on the Preparation of Bagasse Fly Ash as Clarifying Aid for Clarification of Cane Juice
Authors: Zhou Shao Ji , Qin Xiao Yu , Liu Hui Xia , Wang Wei Wei
Published: March 2013

The bagasse fly ash (BFA), an industrial solid waste of sugar industry, was used to facilitate the clarification of cane juice. After being grounded, washed, rinsed and dried, the BFA was added into the juice before the clarification process including heating the juice to 60°C, coagulation with magnesium sulfate at pH=11.0, flocculation with PAM, and then settling and filtration. The effect of BFA on purification indexes including turbidity, purity and color value of the clarified juice, and the addition of BFA on the settling and filtration rates were investigated. The results shown that while having little effect on the pufification indexes, the addition of BFA could intensify the solid-liquid separation of the clarification. The gravity settling was significantly improved with the addition of BFA, with an addition at 1.5%, the mud thickening rate at free settling phase was increased from 20.7 mL/min without addition of BFA to 270mL/min and the final mud volume reduced from 48.0% of the total volume to 32.3%, the settling time being about 5 minutes. With the addition of BFA, the filtration rate increased significantly, the filter cake specific resistance was reduced from 562.8 kg·s·m-4 without addition of BFA to 31.2kg·s·m-4 with the BFA addition of 1.5%, making the filtration feasible. The optimum addition of BFA and the pressure drop for the filtration were 1.5% and 0.1MPa respectively.
Experimental Study on Cr6+ Adsorption in Water about Corncob
Authors: Wang Chao Jin , Tang Ling Lu , Zou Zhou , Liu Wen Ji , Xie Jing , Wang Ying
Published: March 2013

The crude material, corncob, was treated with Cr6+. The product was used adsorbing material of Cr6+. With regard to corncobs, this paper studied the absorption time and modification effect between absorbent and Cr6+ . It could be concluded that the removal ratio of Cr6+ presents an increasing tendency over time and reaches the highest removal ratio at 97% after 250 minutes, which improved 18% compared with unmodified corncob. Besides, it also used branches and peanut shells as comparative materials. Through comparing the test data of three materials, it is found that corncob has a higher absorption rate of Cr6+ than peanut shells at 23% and branches at 11%, which suggests that corncob has the best absorbing effect on Cr6+.
Heteropolyacid Photocatalytical Degradation of Atrazine in Aqueous Solution under UV-Irradiation
Authors: Shen Wei Yang , Liu Fei Ye , Chen Jian Qiu , Guo Rui Xin
Published: March 2013

The photodegradation of atrazine induced by UV-irradiation in aqueous solution was investigated initially. The affecting factors on the photodetradation were studied and described in details such as atrazine initial concentration, temperature, pH value, exposure intensity, oxidant and co-existing substances. It was found that the atrazine initial concentration had no obvious effect on the photodegradation. With the pH value increasing, photodegradation rates decreased. However, we also observed a positive correlation between the degradation rate of atrazine and temperature, exposure intensity and oxidant while the coexisting organic compounds may decelerate photodegradation of the atrazine in water. In this paper, the degradation products had also been confirmed by using LC-MS.
Research on Characterization and Application of High-Performance Ion Exchange Material
Authors: Liu Qiong Qiong , Tan Xin , Shao Xiao Long
Published: March 2013

The object of this research is to investigate the removal of nitrogen in the form of ammonium ion (NH4+-N) from aqueous solutions using Na-form of high-performance ammonium ion-exchange material. The Chinese Kaolin from the province of Guangzhou is used as the raw material and modified to prepare the ion-exchange materials. According to CEC measurement, the obtained ammonium ion-exchange material had an ammonium ion exchange capacity greater than 75mgNH4+-N/g and can be used to remove ammonia nitrogen in water treatment. In this paper, several surface feature evaluation methods（SEM、XPS、IR）are used to discuss and analyze the modification process of kaolin and the action mechanism and modification results of the ammonia ion exchange material.
Improving Anti-Aging Coatings by Coupling of Organic and Inorganic Ultraviolet Absorbers
Authors: Yao Qiu Xiang , Du Mei Li , Sun Ming
Published: March 2013

The individual organic or inorganic ultraviolet absorbers contain absorption bands in different wavelength regions below 400nm, and the coupling of the two types of absorbers can improve anti-aging properties of coatings to prolong the service lifetime. Nanosized rutile and two typical commercial organic ultraviolet absorbers 2 - hydroxyl - 4 - n - octyloxybenzophenone (UV-531) and 2 - (3 - tert - butyl - 2 - hydroxyl - 5 - methylphenyl) - 5 - chloro - 2H - benzotriazole (UV-326) were coupled. Optical property of the hybrid ultraviolet (UV) absorbers was measured by UV-vis. The anti-aging property of polyacrylate coatings added with UV absorbers was carried out in a weatherometer and investigated by chalking and FTIR. The results show that hybrid UV absorbers have better performances of UV absorption with synergistic effects than both organic and inorganic components. In addition to improving the protection against UV, the coatings properties of adhesive, pencil hardness and stain resistance were increased by adding hybrid UV absorbers. The anti-aging mechanism of UV absorbers was analyzed.
Study on Corrosion Wear Behavior of 70 Aluminum Alloy Anodic Oxide Coating
Authors: Lou Bai Yang , Zhu Guo , Li Pei Hua , Dong Han Shan
Published: March 2013

In vitriolic electrolyte, DC power supply is used on 7075 aluminum alloy to have anodic oxidation treatment then let the oxidized samples have a treatment of electroless plating. Surface morphology of the coating and performance of corrosion wear are studied by means of scanning electron microscope (SEM) and friction and wear experimental machine. The results show that unsealed oxide coating have many holes and cracks, which are extremely badly-distributed; corrosion resistance of the oxide coatings which have the treatment of electroless plating have improved, having lower coefficient of friction and better performance of corrosion wear; besides; coefficient of friction of the samples in water is higher than that in salt water, its wear amount is less.
W-Doped Vanadium Oxide Thin Films Prepared by Reactive Magnetron Sputtering
Authors: Chen Shuang , Zhang Li Fang , Dong Cui Zhi , Zhang Kuai , Zhu Xiudong
Published: March 2013

W-doped Vanadium oxide thin films were prepared on the substrates of glass and Si (100) by reactive magnetron sputtering after annealing in vacuum. The structure and morphology were characterized by X-ray diffractometer and atomic force microscopy(AFM), respectively. The results show that,when the oxygen volume percent (Po2) increasing from 15% to 25%, the films on the Si(100) were vanadium oxides with high-valences. After vacuum annealing at 500°C for 2h, the major phase of W doped films on glass is VO2. The surface roughness of the film increase for the longer time annealing.
Experimental Studies on Micro-Characteristics of Nanocrystalline MgO
Authors: Zhao Guo Jian
Published: March 2013

By analysis of X-ray diffraction and infrared absorption spectrum, we obtained the microstructure parameters of the MgO powders sample and found that the main character infrared absorption peak was at 416 cm-1. And we calculated out the average grain-size of sample according to the breadth of diffraction peak and the line broadening formula.
Application of WS2 in Solid Lubricant Coating for Metal
Authors: Hou Suo Xia , Gao Hui , Jia Xiao Ming
Published: March 2013

WS2 has excellent tribological properties; it is emerging of lubricating materials. MoS2 is commonly used solid lubricants and wide range of applications, but its poor heat resistance. WS2 can well make up for the inadequate performance of the MoS2, but uses it as a solid lubricant in performance research on metallic materials. By friction and wear testing, the paper gets feasibility analysis of the application that WS2 instead of MoS2 in the field of solid lubrication, while exploring the synergies between them, laying the foundations for the manufacture of new types of composite lubrication coatings.
Synthesis and Characterization of New Mesoporous Silica Film Materials for Explosive Detection
Authors: Ma Li , Wen Yu Quan , Yan Nan
Published: March 2013

Trace explosives detection plays a more and more important role in military, civilian and opposition to state terrorism application. Through sol-gel technique and spin coating technology, three different types of surfactants as structure-directing agent， a series of different pore size mesoporous silica thin films with two-dimensional hexagonal structure doped by silylated naphthol fluorescence dye were successfully fabricated. By using fluorescence spectra method, different films doping fluorescence dye were sensed toward nitro explosive vapor such as 2,4,6-trinitrotoluene (TNT), 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX), octahydro -1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX), and exhibit rapid response rate and extremely high fluorescent quenching efficiency, close to 72% after 60s response to TNT. The results clearly show that mesoporous silica films, with different porous size and structure, easily to be prepared and own high sensitivity, could be used as a new alternative of trace explosive detecting material.
Molecular Dynamics Simulation of the Influence Factors of Particle Depositing on Surface during Cold Spray
Authors: Gao Hong , Liu Chao , Song Fen Hong
Published: March 2013

Using molecular dynamics simulation, the influence factors of deposition process, such as cluster incident velocity, material hardness and so on, were studied. The cluster incident velocity influences the combination strength between the substrate and cluster greatly. The higher the cluster velocity is, the stronger the combination strength is, and the faster the cluster forms the crystalline structure like the substrate. Higher temperature of the substrate and the cluster will improve the combination strength. The size of the cluster influences the effect of combination as well. The larger the cluster is, the stronger the combination strength is. If a soft cluster impacts on a hard substrate, because of lack of enough deformation at the interface of the substrate, it is difficult to form the effective combination. If a hard cluster impacts on a soft substrate, the lattice defects occur and the cluster takes a longer time to form crystalline structure.
Development of Cyclic Rotating Bending Process for Microstructure Control of AZ31 Magnesium Alloy Tube
Authors: Zhang Zi Cheng , Manabe Kenichi , Furushima Tsuyoshi , Tada Kazuo
Published: March 2013

In this study a cyclic rotating bending process for microstructure control of metal tubes was newly proposed. The AZ31 magnesium alloy tube was conducted to investigate the effect of the rotating bending process on the microstructure and mechanical properties of metal tubes. The rotating bending process was carried out with rotation speed of 20r/min for 10min at the temperature of 150, 200, 250, 300 and 350°C. The rotating bending processes carried out with various conditions show that the grains in cross-section and longitudinal section of magnesium alloy tube were refined for all samples by the rotating bending process with rotation speed of 20r/min for different rotation numbers and temperatures. The rotating bending temperature shows a various effects on the mechanical properties. When the temperature was 200°C, the highest strength as well as ductility was obtained.
Research on Finite Element Simulation and Test of Two-Pass Deep Drawing Forming for Conical Parts
Authors: Han Zhi Ren , Yuan Ze Bing
Published: March 2013

This paper is focus on two-Pass Deep Drawing Forming of conical axisymmetric parts, study on the finite element simulation and test of multi-Pass deep drawing part. It carry on the finite element analysis and calculation using the ANSYS/LS-DYNA software platform, analyzing the simulation results such as stress , strain distribution and formability by post-processing LSPOST software. It was done multi-Pass deep drawing test using a set of combined type mould. Based on the multi-Pass forming test by using a set of combined type mould, comparison of simulation and test data can be obtained through the forming limit diagram. The result of simulation and test is basically the same and both reflect the formability.
Deformation Behavior of AZ31 Magnesium Alloy at Elevated Temperature
Authors: Lu Ya Lin , Li Xing Cheng , Wang Hong Jin , Li Xiao Ping
Published: March 2013

Hot compression test for AZ3l magnesium alloy at deformation temperatures of 523-723K and strain rates of 0.01-10s-1 were carried out using Gleeble-3500 thermo-mechanical simulator. The experimental results show that the flow stress and microstructure vary apparently with deformation process parameters. Microstructure observations show that dynamic recrystallisation (DRX) takes place during the deformation. The characteristic with the dynamic recrystallization change with the process parameters.
Study on Developing Q345XJ by UFC in the CSP
Authors: Chen Lian Gui , Kong Yong Lin , He Juan , Chai Hai Tao
Published: March 2013

The UFC (ultra fast cooling) system has great powerful cooling ability (cooling rate higher than 300°C/s for 4mm sheet). In order to make up for the deficiency of the laminar cooling system in production development, the CSP of LY steel adopted the front located solution of UFC (located between the finishing mills and the laminar cooling system). By good match between UFC and the laminar cooling system, fine adjusting the chemical composition and changing the rolling technology of Q235B, the CSP of LY steel had carried out the industrial production of Q345XJ steel (upgraded by Q235B , only need to add extremely small amounts of alloys ), the production cost of Q345XJ steel is greatly decreased.
Simulation and Optimization of Die Forging Process for High Pressure Valve Bonnet
Authors: Zhang Jian Lin , Zhang Li Wen , Yang Yang , Zhu Zhi
Published: March 2013

In this paper, the multi-stage die forging process of a high pressure valve bonnet was simulated by 3D coupled thermal-mechanical rigid-viscoplastic finite element (FE) method. The deformation and the metal flow field of billet were obtained. Based on the simulation, two optimized schemes were put forward for improving the yield. Both of them can save material and ensure the stability of billet during the forging process. The study can provide scientific theory foundation for practical engineering applications.
Analysis of Effect of Process Parameters on Warpage of a Automobile Bumper Injection Molded Parts
Authors: Wu Shu Ting , Liu Hong Bin , Wu Hai Tao
Published: March 2013

Take a automobile bumper for example, analysis of effect of process parameters on warpage of a automobile bumper, including melt temperature, injection time, cooling time and packing pressure, on the warpage of the automobile bumper were analyzed by means of Moldflow software. The results show the warpage decrease of the increase of the injection time, the cooling time and the packing pressure, but when the packing pressure reached 45MPa, the warpage slightly increased; the melt temperature should be picked out by the characteristics of the plastics material.
Compression Behavior and Mechanical Modeling of Nanocrystalline Ni under High Strain Rate Loading
Authors: Zhu Rong Tao , Dou Dong Yang , Zhang Xin Xi
Published: March 2013

To investigate mechanical properties and understand deformation mechanisms of nanocrystalline materials under high strain rate, the dynamic compression tests for nanocrystalline Ni bulk prepared by high-energy ball milling and hot-pressure sintering were carried out at different high strain rate on Hopkinson bar and a mechanical modeling based on deformation mechanism under high strain rate loading was developed. The experimental results indicate that the nanocrystalline Ni sample has higher strength and good ductility and the strength of the sample increased with the increasing strain rate. Meanwhile, The predictions by the mechanical modeling based on mechanism of dislocation gliding and grain boundary sliding at high strain rates show good agreements with the experimental data.
The Theoretical Analysis and Application of the Ultra-Precision Machining the End Surface of Stop Valve’s Valve Flap with the Diamond Facing Tool
Authors: Zhu Ji Hua , Liu Xue Xia , Tian Xue Min , Chen Jian Fei
Published: March 2013

A new process was proposed. The disadvantage of of using brown alumina grinding wheel to grinding and lapping surface was studied in the analysis. The diamond facing tool was designed and manufactured with the solution of the key technique of the critical technical of single crystal diamond’s material selecting, grinding, welding. The face cutting parameters: “V”, “f” and “ap” were measured by experiment and academic analysis. Tt can fully meet the quality requirements of stainless steel valve flap’s surface used by one valve machinery factory; meanwhile the productivity was increased by a factor of 15, with overcoming the disadvatange of grinding and lapping valve flap’s surface.
Effects of Mixing Chamber Shape on Cutting Performance in Abrasive Water Jet
Authors: Lee Hyo Ryeol , Cho Yong Sik , Kim Hwa Young , Ahn Jung Hwan
Published: March 2013

It is well known that abrasive water jet(AWJ) was developed as a kind of high-density energy processing technologies. AWJ is used to obtain cutting quality of various materials such as metal, ceramics, glass and composite materials within a short manufacturing time because of the characteristics of heatless and noncontact processing. However, surface roughness and dimension error like round, burr, taper depend on the cutting conditions such as pump pressure, cutting speed, orifice diameter, stand off distance, abrasive flow rate and workpiece. In this paper, the effect of the shape of mixing chamber on surface quality is studied. Parabolic mixing chamber is proposed and performance is compared to that of cylindrical mixing chamber by experiment. The surface roughness was improve 0.15㎛ to 2.29㎛ and the taper angle was improve 0.0716° to 0.143° by parabolic mixing chamber.
Evaluation Influences of Residual Stress on Machining Aluminum Part of Cooling Plates
Authors: Yang Yin Fei , Qiao Hai Bin , Zhang Zheng , Li Liang
Published: March 2013

During machining age-hardening aluminum alloy, quench-induced residual stress usually caused serious distortion, which made parts difficult to meet precision requirements. Residual stress patterns through the thickness of 6061T6 aluminum cooling plate were measured by layer removal method. According to residual stress patterns and two parts, four machining strategies were designed and developed by experiment and FEM simulation for investigating the relationship between residual stress and distortion. Distortion increases with increasing stress magnitude, machining depth, and machining asymmetry. Distortion can be minimized effectively by employing appropriate machining strategies which can balance residual stress in parts.
Influence of Dielectric Jet Flushing during Electro Discharge Diamond Surface Grinding Process
Authors: Agarwal Gopal , Modi Manoj
Published: March 2013

The influence of dielectric jet flushing during Electro Discharge Diamond Surface Grinding (EDDSG) on Ti-6A-4V has been reported in this paper. The metal bonded diamond grinding wheel is used as electrode in Electro Discharge Diamond Surface Grinding process. In this process mechanical grinding is coupled with electrical spark of electrical discharge machine to take up the advantages associated with hybrid machining process. The important input parameters in this investigation were “duty factor”, “wheel speed (rpm)”, “magnitude of current (ampere)” and its “duration (Ton, micro-second)”. The effects of these parameters on outcomes i.e. material removal rate (MRR) and surface roughness (Ra) are measured. The noticeable enhancements in material removal rate and surface finish have been seen during EDDSG of Ti-6Al-4V with effective jet flushing. The performance of EDDSG with jet flushing and without jet flushing has been compared.
Preparation and Characterization of Micron Silicon Dioxide Spherical Particles
Authors: Wei Jun Fang , Zhang He , Zhu Fang
Published: March 2013

Monodisperse micron-grade silicon dioxide spherical particles have been prepared by using Stöber method. Effects of the solvents, the concentration of ammonia, TEOS and water on the particle sizes and the particle diameter distribution of silicon dioxide were investigated by scanning electron microscopy (SEM). The results show that the monodisperse micron-grade silicon dioxide spherical particles could be obtained in isopropanol solvent under a suitable reaction condition. The particle sizes increase with the decreasing of TEOS concentration. When the concentration of ammonia and water is increased, the silica particle size will increase. The particle diameter distribution narrows with the increment of the ammonia concentration and decrement of water concentration.
Modeling and Experimental Study on Cutting Force of Diamond Circular Saw in Cutting Granite Using Response Surface Methodology
Authors: Zhang Zheng Mei , Xiao Hai Wen , Wang Gui Zhen , Zhang Shu Zhong , Zhang Shu Qin
Published: March 2013

Based on experiment of sawing Wulian red granite with diamond circular saw, the relations between the cutting force with machining parameters are studied. Cutting speed, feed rate and cutting depth are considered as the process parameters. The cutting force in sawing granite operation are measured and the experimental results are then analyzed using response surface methodology. From the analysis, it is seen that the cutting force Fx , Fy and Fz are reduced with the increase of cutting speed and increased with the increase of feed rate and cutting depth, and the mathematical models of the cutting force are developed. By ANOVA for the cutting force models, It is concluded that the models are significant at 95% confidence level and the significant effects are the first-order of cutting speed, feed speed, cutting depth and the quadratic of cutting depth.
A Kind of Optimization Model on Turning Process Based on Productivity and Cost
Authors: Yan Wei , Fan Jun , Guo Xu Feng
Published: March 2013

The machine processing optimization model is one kind of typical restraint optimization model. This paper takes the lathe work as an example to study the construction way of optimization model construction under a series of constraint environments, and its goal is pursues the highest productivity and the lowest cost.
Atmospheric TIG Arc Diagnostics with a Low Disturbance Electrostatic Probe
Authors: Li Yuan Bo , Zhu Liang
Published: March 2013

The use of electrostatic probe is available and simple in atmospheric TIG arc plasma diagnostic. Usually electrostatic probe takes disturbance in arc plasma due to sweeping motion. A low disturbance electrostatic probe was developed. This probe consisted of aluminum wire and moved through arc plasma along probe’s longitudinal direction to avoid sweeping motion. And the signal collected by this probe required Abel inversion to convert into the value per 1 mm probe length. With the application of the low disturbance probe in biased condition, ion saturation current density in various sections along the axial direction of TIG arc was obtained. The result shows that half width and peak value of ion saturation current density increase with the enhance of arc current; the radius of current-carrying area can be estimated by the half width of ion saturation current density; along the axial direction of TIG arc, the radius of current-carrying area change to the minimum near cathode.
Prediction of Welding Deformations of CRH380 Aluminum Alloy Side-Wall with Equivalent Thermal Load Method Based on Inherent Strain
Authors: Li Ya Na , Xie Su Ming , Zhang Jian Hui
Published: March 2013

The manufacture core of CRH380 high-speed train is aluminum alloy welding technology. However, welding residual distortion which occurs in welding process brings unfavorable effect on the quality of high-speed train. As a result, welding distortion forecasting and control become an important and urgent research topic in railway vehicles. Using equivalent thermal load method based on inherent strain given by the formulae, the welding distortion of aluminum alloy side-wall was predicted by an Elastic FEM which consider actual welding conditions. The simulation results were compared with experimentally measured data to evaluate the validity of the model and to verify effectiveness of this method for large-scale welding structure which had long seams.
The Compulsively Short Circuiting Transfer Phenomenon Study in Rotational Arc MAG Welding
Authors: Gao Yan Feng , Xiao Jian Hua
Published: March 2013

The present paper describes the compulsively short circuiting transfer phenomenon of welding current in rotational arc MAG welding. Based on a previously reported model of spray transfer welding, a mathematical model of the short circuiting transfer of rotational arc welding is proposed. A series of welding experiments had been conducted and it’s results show that short circuiting transfer would take place when the welding gun electrode rotating to the sides of V groove. The relationship between the short circuiting transfer frequency and the arc rotational frequency also had been studied.
Evaluation of Effect of Welding Methods to Corrosion and Hardness Characteristics of Welded Zone
Authors: Lee Sung Yul , Won Jong Pil , Park Dong Hyun , Kim Yun Hae , Moon Kyung Man , Jeong Jae Hyun
Published: March 2013

Recently a fuel oil of the diesel engine in the merchant ship has been changed with heavy oil of low quality as the oil price is getting higher and higher .Therefore, the wear and corrosion against all parts of the engine are significantly increased with using of heavy oil of low quality. In particular, the degree of wear and corrosion in between spindle and seat ring of exhaust valve are more serious compared to the other parts of the engine due to severe environment such as the high temperature of exhaust gas and repeating impact. Thus, repair welding is a unique method to prolong their lifetime in an economical point of view. In this study, an effect of welding methods to corrosion and mechanical properties of both weld and base metal zone was investigated with some electrochemical methods such as measurement of corrosion potential, cathodic and anodic polarization curves, cyclic voltammogram and AC impedance etc. in. The hardness of the weld metal zones exhibited comparatively higher values than that of the base metal zone. And their corrosion resistances were also increased compared to the base metal. The weld metal zone of P1F( plasma welding with 1 pass) showed a relatively good corrosion resistance as well as the hardness compared to the other welding methods. Consequently, it is considered that plasma welding method is a desirable method compared to other welding methods for both better corrosion and hardness properties.
Comparison between Dextran-Coated Superparamagnetic Iron Oxide Nanoparticles and Magnetoliposome on Rabbit Corneal Endothelial Cells Labeling
Authors: Wu Ming Feng , Lu Li Xia , Sun Xiao Ting , Du Fei , Bi Yan Long
Published: March 2013

Purpose: To evaluate and compare the promising applications of dextran-coated superparamagnetic iron oxide nanoparticle (dSPION) and magnetoliposome on corneal endothelial cells transplant therapy. Methods: Two kinds of novel superparamagnetic iron oxide nanoparticles (SPIONs), dSPION and magnetoliposome were synthesized, characterized and incorporated to rabbit corneal endothelial cells (RCECs). Uptakes of SPIONs were identified by Prussian blue staining. Cells migrating rates in magnetic field were calculated. Cytotoxicities of the two SPIONs were detected using MTT assay. Result: Magrating rates of dSPION (4 ~ 64 μg/mL) labled RCECs were 24.1±2.4% ~ 78.3±2.2%, and 5.0±1.7% of unlabeled RCECs. (p0.05) Conclusion: RCECs labeled with each SPION migrated significantly in external magnetic field, while cytotoxicities did not revealed. Our study demonstrated the potential applications of dSPION and magnetoliposome on labeling RCECs for cell transplantation.
Laser Processing Speed vs Morphology of Glazing Ceramics
Authors: Fan Ji Wei , Li Xiao Peng , Zhao Hui Jun , Jiao Zhi Qiang , Zhang Xiao Li , Zhang Zhao Jun , Zhang Zhen Guo , Zhang Rui Jie
Published: March 2013

Laser processing glazing ceramics is a new application of laser technique. This article presents the study of laser processing speed of glaze cladding. It found that the laser processing speed affected the morphology of glaze cladding significantly. Within the experimental conditions, rise of processing speed can decrease the depth of melted zone and the width of glaze cladding, vice versa.
Effect of Casting Design to Microstructure and Mechanical Properties of 2 Mm Twdi Plate
Authors: Sulamet-Ariobimo Rianti Dewi , Soedarsono Johny Wahyuadi , Suharno Bambang
Published: March 2013

It is important to strictly maintain the cooling rate in producing thin wall ductile iron (TWDI) to prevent carbide formation. There are many ways to control cooling rate whereas casting design is the most independent one. This paper discusses the effect of gating system design on microstructure and mechanical properties of 2 mm TWDI plate. A casting design based on vertical gating system is made to produce TWDI plates with the thickness of 1, 2, 3, 4, and 5 mm. This vertical system allows plates to function as runner. This situation helps in preventing premature solidification. There are three designs in which they are coded as T1, T2, and T3. These three designs were also used in making 1, 3, and 5 mm TWDI plates of which the result has been published. Z-Cast is used to conduct a casting design simulation for filling flow and solidification. The result of flow simulation shows that the filling flow is resulted in two kinds. The result of solidification specifies that in T1 and T2 the 2 mm TWDI plates solidify in the same time as 1 mm TWDI plate. Furan sand was used as moulds in the experiment. The result of the experiment highlights that in all of the designs, which have microstructure and consisted of nodule graphite in ferrite matrix, no trace of carbide and skin effect are formed. The length of skin effect varies in all of the designs. The highest nodularity is only 86% while nodule count is 1344 nodules/mm2. Brinell hardness number for all of the design is beyond the standard given by JIG G5502. As for UTS and elongation none of the designs exceeds the minimal standard. The result of the experiment does not confirm the result of the simulation. In sum, compared to the previous result, the curve trends of 2 mm TWDI plate combine the curve trends of 1 and 3 mm TWDI plates.
The Study on Microstructures and Properties of the Direct Squeeze Casting Al-Zn-Mg-Cu-Zr-Sc Alloy
Authors: Wang Zhi Gang , Xu Jun , Zhang Zhi Feng , Li Bao , Li Da Quan
Published: March 2013

Trace elements Sc was added to the Al-Zn-Mg-Cu-Zr alloys, the differences of the microstructure and properties using gravity casting and squeeze casting are compared. The result shows that through the addition of trace elements Sc, the Al-Zn-Mg-Cu-Zr alloys casting microstructure was refined effectively, dendrite segregation was alleviated and the mechanical property of alloy was enhanced. Using squeeze casting forming could improve the compactness of the alloys, decrease the probability of occurrence of shrinkage cavities, porosity and segregation, in addition, the grain could be refined by the pressure forced on the alloy melt. Combined the element Sc microalloying and squeeze casting used in Al-Zn-Mg-Cu-Zr alloy forming, we could get the casting with uniform, compact, little defect microstructures. This combination could provide a new way to the Al-Zn-Mg-Cu-Zr alloy forming.
The Mechanical Property of CFRP Laminates with Voids
Authors: Zhang A Ying , Zhang Dong Xing
Published: March 2013

The effects of voids on the bending strength and ILSS of CFRP laminates were discussed in this paper. The bending strength and ILSS of specimens decreased with the porosity increasing from 0.33% to 1.50%. The empirical models of the bending strength and ILSS of CFRP laminates with different porosities are established by using ORIGIN software. The evolution laws of the bending strength and ILSS with different porosities were corresponding to the form of exponential function.
Experimental Study on the Recovery of Apatite from Ore Tailings in Hebei
Authors: Jia Qing Mei , Li Feng Jiu , Qu Yun Long
Published: March 2013

On the basis of study on the ore property of magnetic ores containing apatite,The experiment results show that a magnetic concentrate having a recovery of 58.04%,a concentrate containing 60.38%Fe and yield of 10.90% after by means of two-stages magnetic separation at a grinding fineness of 75%-200 mesh of the first stage , grinding fineness of 85%-200 mesh of the second stage After the first magnetic separation. Based conditional experiment and open-circuit test, under a grinding fineness of 50%-200 mesh, through a flotation flowsheet of "one-stage rough flotation, three-stage cleaning and one-stage cleaning" with the first magnetotail ,a apatite concentrate with P2O5 33% , The yield of apatite was 10.90% , the recovery of apatite reaches to 85% and can be obtained in which the total iron content is lower than 2%.