bluuebunny/crossref_metadata_2025 huggingface dataset:
Fabrication of Poly Phosphoric Acid into Polyacrilonitrile Composite Nanofibers
Authors: Mohammad Shafiee Mohammad Reza , Salehi Esfandarani Maryam , Moloudi Raheleh , Ghashang Majid
Published: June 2012

Poly phosphoric acid/ Polyacrilonitrile composite nanofibers (PPA/PAN composite nanofibers) has been fabricated by the electro-spinning of PAN solutions containing different amount of PPA. The prepared nanofibers have been characterized by the using of FT-IR, SEM and XRD techniques
Synthesis of MoO3 Nanostructures and their Photocatalytic Properties
Authors: Yu Zhi Ri , Chu De Qing , Li Qiu Hong , Wang Li Min
Published: June 2012

Different morphologies of molybdenum trioxide have been synthesized via low-temperature liquid phase method, hydrothermal synthesis and the direct decomposition method. Fourier transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscope (SEM) were employed to characterize the as-synthesized products and the photo catalytic degradation properties were studied for different nitrogen of dyes. The results indicate that the discoloration rate of methylene red was the best and it could be more than 90 percent in the same conditions. Therefore, the synthesized MoO3 powder is a kind of photocatalayst with excellent performance.
The Effect of Strain Rate on the Tensile Behavior of Electrodeposited Nanocrystalline Ni-Co Alloy
Authors: Qin Li Yuan , Lian Jian She , Quan Long Zhe , Jiang En Chen
Published: June 2012

A fully dense nanocrystalline Ni-Co alloy with 18 nm grain size exhibited high strength of about 2200 MPa and ductility of 8.19.2% at strain rates of 1.04×10-5 to 1.04 s-1 and room temperature. The alloying of Co element induces the grain refinement, solid solution hardening and decrease of stacking fault energy should contribute to the favorable combination of mechanical performance. The obvious distinctions of fracture-surface morphologies with strain rate alteration were attributed to underlying deformation mechanism transition. The high strain rate sensitivity exponent and small activation volume indicate that grain boundary activity may be expected in this alloy.
Synthesis of Magnesium Oxychloride Nanowhisker by Microemulsion Method
Authors: Qin Lin Qing , Wang Chuang Bin , Qin Zhi Yang
Published: June 2012

Magnesium oxychloride (MOC,5Mg(OH)2•MgCl2•8H2O,phase 5) nanowhiskers were synthesized via a reverse microemulsion method by suing cetyltrimethyl ammonium bromide (CTAB)/n-butanol (C4H10O)/cyclohexane (C6H12)/water as soft-template. Aqueous solution of magnesium chloride (MgCl2) and MgO powder were suing as reactants. The products were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM). Results indicated that MOC nanowhiskers can be obtained when the mass ratio of MgO, magnesium chloride hexahydrate and water is 1:1:0.64. The aspect ratio of MOC nanowhisker is more than 100 with an average diameter of 50-90 nm. The influence of size of MgO particles and mass ratio of MgCl2 solution to CTAB on morphology of whiskers was investigated. The growth mechanism of the MOC nanowhisker was also supposed in this study.
Synthesis of Highly Ordered Silver Nanowire Arrays with SERS Activity
Authors: Xia Tian Yu , Zhang Li Sheng , Wang Pei Jie , Fang Yan
Published: June 2012

The highly ordered silver nanowire arrays were fabricated successfully by an easily produced and handled approach with the assistance of nanoporous anodized aluminum oxide(AAO) template. The silver nanowires with uniform diameters are highly ordered and parallel to each other. A broad UV-visible absorption band with a center at 401nm of silver nanowire arrays were detected. Optimized surface enhanced Raman scattering(SERS) signals of crystal violet molecules(CV) were recorded. It was found that the substrate exhibits strong enhancement properties due to the surface plasma resonance(SPR) of highly ordered silver nanowire arrays. The enhancement factor was calculated as 3.5×106. In addition, the results offered a simple technique in preparing highly ordered nanowire arrays which can be used as negative-refractive-index material as well as excellent SERS substrate.
Preparation of ZnO Nanostructures and their Self-Assembly
Authors: Huang Huan Di , Yang Wen Tao , Wang Li Na
Published: June 2012

Well-defined ZnO nanostructures and their self-assembly have been fabricated directly on Zn foil via a hydrothermal synthesis method. (NH4)2S2O8 was introduced as the controllable reagent for the growth of ZnO. Nanorod-, nanowire- and nanobranch-like ZnO can be easily prepared. The experiment results indicated that the zinc oxide morphology and thier self-assemblied structures can be controlled by changing the reaction conditions. The effects of the concentration of NaOH, reaction temperature on the morphology of these nanostructures were investigated, and the possible mechanism of the ZnO nanostructures was proposed.
The Preparation of Silver Nanowires and the Study of SERS Activity of Single Nanowire
Authors: Li Hai Yan , Dang Mei Jie , Wang Pei Jie , Fang Yan
Published: June 2012

In this report, the polyol process was used for preparing silver nanowires. In this improved method, the silver nanowires with high purity, high yield and high sensitive surface enhanced Raman scattering (SERS) activity were synthesized mainly by sealed heating. Then the samples were characterized by scanning electron microscopy (SEM). Its optical absorption properties were measured by UV-Vis spectrophotometer; furthermore, SERS spectra of R6G molecule on the single nanowire was obtained and systematically studied by excitation wavelength 532nm. Our experimental results showed that the length of nanowires by our improved method is uniform and has high yield, high purity and higher SERS enhancement effect. The UV-Vis absorption spectrum of the samples displayed the transverse and longitudinal plasma resonance (SPR) absorption bands of silver nanowires which are located at 358nm and 416nm, respectively. Also single nanowire SERS activities which are dependent on the different substrates were researched.
Study of Degradation Function by the Composition of Nano Bi2WO6 and Graphine
Authors: Zhang Yun , Liu Cang Song , Sheng Jian Guo
Published: June 2012

The composition of nano Bi2WO6 and graphine is manufactured and its structure are characterized by fhotoluminescence and electrochemical impedance in this paper, and their photocatalytic degradation function are compared to methanal and urea solution, respectively. The results show that: the composition of nano Bi2WO6 and graphine has the highest photocatalytic degradation efficiency than Bi2WO6, and it is a good photocatalyst of removing ammonia nitrogen and reducing COD.
Rapid In Situ Reactive Sintering and Properties of ZrO2-ZrW2O8 Composites
Authors: Guo Xiang Yang , Fan Chun Zhen , Liu Xian Sheng , Song Wen Bo , Cheng Chun Xiao , Liang Er Jun , Chao Ming Ju , Yuan Bin
Published: June 2012

ZrO2-ZrW2O8 diphasic composites with controllable coefficients of thermal expansion (CTEs) are synthesized by rapid in-situ reactive sintering with ZrO2 and WO3 as reactants. High density of ZrO2-ZrW2O8 composites without decomposition of ZrW2O8 is obtained with Y2O3 sintering additive. The CTEs of specimen with ZrO2 to ZrW2O8 mass ratio 1:1.0, 1:1.3, 1:1.5 and 1:2.0 are measured to be about 1.20×10−6, 0.31×10−6, -0.78×10−6 and -1.13×10−6 K−1, respectively. Raman mappings demonstrate homogenous dispersions of ZrO2 and ZrW2O8 in the ZrO2-ZrW2O8 composites. In addition to the role as sintering additive, some Y3+ cations enter the lattice to substitute Zr4+ in ZrW2O8, leading to an increase in disorder and a decrease in phase transition temperature of ZrW2O8 in the composites.
Electrooxidation for Methanol on Pd Nanoparticles Modified Electrodes in Alkaline Medium
Authors: Xu Ming Li , Yang Guo Tao
Published: June 2012

In this paper, Palladium nanoparticles were electrodeposited on the surface of glassy carbon electrodes by more circles cyclic voltammetry method and Palladium nanoparticles modified electrode (Pd/GCE) was obtained. Morphology and crystal structure of nanoparticles were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). The performance and electrochemical process of catalytic oxidation methanol were measured and analyzed by cyclic voltammetry (CV), chronoamperometric curves (i-t) and alternating current impedance spectra (AC impedance) in KOH solution. The results showed that catalytic activity of Pd nanoparticles modified electrode for methanol was over 30 times higher than that of the plate Pd electrode, and catalytic performance was good. In addition, the catalytic oxidation was mainly diffusion-controlled process.
Preparation of Au@Ag Core-Shell Nanorods and Investigation of its Surface Plasmon
Authors: Yuan Wei , Wang Pei Jie , Fang Yan
Published: June 2012

Different aspect ratio (length/width) gold nanorods were prepared in aqueous solution by seeding growth method. Aspect ratio of the nanorods was controlled accurately by changing the silver ions concentration. Ultraviolet-visible (UV-vis) spectra demonstrate the regularation that longitudinal plasmon resonance absorption wavelength of gold nanorods reveal red shift with the increase of aspect ratio. Gold nanorods were wrapped with Ag shells by chemical reduction silver ions on its surface. Different from gold nanorods, the transverse modes of the Au@Ag core-shell nanorods have two bands which contributed from the Ag and Au, respectively. On the other hand, centers of longitudinal surface plasmon of the core-shell nanorods exhibit blue shift with the Ag shell thickness increasing.
Surface Morphology and Texture of Nickel Crystal Micro-Casting by Electroforming under Magnetic Field
Authors: Jia Wei Ping , Wu Meng Hua , Yang Fan
Published: June 2012

Micro-components were electroplated using composite electroforming technology under magnetic field. The surface morphology of the micro components was examined using scanning electron microscope (SEM) and X-ray spectrometer was used to detect texture. The results show that: the texture and surface morphology of the micro components are influenced by the current density and the magnetic field intensity. With the increase of current density, the size of crystal grains decrease firstly but increase later .And as the increase of the magnetic field intensity, the size of crystal grains become smaller and more uniform. Besides, the current density and the magnetic field intensity have a great impact on the texture of castings. As the increase of the current density, the texture orientation changes from (111) to (200). At the same time, along with the increase of the magnetic field intensity, the diffraction peak (200) is suppressed while the diffraction peak (111) is enhanced obviously.
Field Emission Properties of the Single-Wall Carbon Nanotubes Synthesized by Arc-Discharge Method
Authors: Wu Shu Xian , Yang Fu , Xue Shao Lin , Zhao Xin Luo
Published: June 2012

The field emission properties of single-wall carbon nanotubes with purity higher than 70%,which were produced by dc arc discharge evaporation of a carbon electrode including 1% Fe catalyst in H2-Ar mixture gas was studied.The single-wall carbon nanotubes that were produced by this method possess high a ‘clean’ surface since the coexisting Fe catalyst nanoparticles can be completely eliminated by a two-step purification process.The field emission properties was verified by measuring the emission current density(J) versus the applied electric field(E), the corresponding Fowler-Nordheim(F-N) plot for the sample.Through looking at the emission photos, the uniformity of field emission is found to be excellent.
Functions of Cotton Yield Response to Soil Salinity in Akesu River Irrigation District
Authors: Zhang Yu , Cong Pei Tong , Hu Shun Jun , Wang Li Hong , Guo Feng Qing , Wei Wei
Published: June 2012

Based on experimental data from the five observation points during the three years, the linear subsected functions and the nonlinear s-shaped functions between the cotton relative yield and soil salt content on the salinized soil about the 0-20cm soil layer and the 0-40cm soil layer in Akesu River Irrigation District were constructed by linear regression and nonlinear least square approximation. Their applicabilities were analyzed and compared and it was found the nonlinear s-shaped function of the 0-20cm soil layer to fit better with the response relationship between the cotton relative yield and the soil salt content on the salinity soil than others in Akesu River Irrigation District.which and the indexes of cotton salt tolerance were definited, and then the indexes of cotton salt tolerance were drawn on with the function with better applicability. From the function, some indexes of salt tolerance，which contained the cotton critical soil salt content, the cotton threshold soil salt content, the soil salt content at the fastest rate of cotton relative yield reduction, and the soil salt content at the 50% cotton relative yield reduction, and so on, were determined, which can be provide as the important references for the agricultural planting, improvement of salinized soil and irrigation with saline water in Akesu River Irrigation District.
Study of Adhesion in Steels Surface Hardened
Authors: López-Perrusquia Noe , Doñu-Ruíz Marco Antonio , Vasquez Frumencio , Trujillo-Alfaro O. , Vargas-Oliva Yahir Edgar
Published: June 2012

This study evaluates the adhesion of boride layers on the surface steels of AISI 4140, 8620, W2 and H13 by standard VDI 3198 [1], the surface hardened was carry out by the technique of power pack boriding at the temperatures of 1273 K, with time exposition of 6 and 8 h. The presence of boride phases was determinate by X-ray diffraction (XRD) analysis. A Rockwell C indentation tester was applied on the surface steels boriding, this impact test determines qualitatively the adhesion on layer/substrate indentation print and Vicker microhardnes was evaluate a load of 2.9 N on phase FeB and Fe2B, the steels have scale delamination H1 to H6.
Study on the Flow Stress Curve of the Warm Deformation of Medium Carbon Steel
Authors: Li Zhi Jie , Peng Yan , Liu Hong Min , Xiao Li Zi , Wang Su Fen , Gao Peng
Published: June 2012

The warm compression experiment of medium carbon steel was conducted using the Gleeble-3500 thermal/mechanical simulator system. By the experiment, the warm deformation of medium carbon steel was studied within the temperature (500~700°C) and the strain rate (0.001~10s-1). The results indicate that the flow stress was increasing with the lowering temperature and the higher strain rate. And the stress-strain curves could be divided into four parts, including four stage of the Strain-Hardening, the First Softening, the Strong Softening, and the Steady Deformation. Dynamic recovery softening has little effect on the flow stress. The peak stress was caused by kink and fracture of the lamellar cementite. Strong softening stage was longer than other one, while its softening influence was stronger compared with hot deformation.
Effect of Ferrite Grain Size on the Yield-Strength Ratio of Low-Carbon Alloy Steel
Authors: Yu Qing Bo
Published: June 2012

Using thermo-mechanical controlled process, the experiment on the yield-strength ratio of low-carbon alloy steel was carried out and the effect of ferrite grain size on the yield-strength ratio of steel was discussed. Theory analysis and the experimental results indicate that the smaller ferrite grain size is, the higher the yield-strength ratio is. In addition, the regression formulas on yield and tensile strength are also obtained.
Fracture of High Carbon Microalloyed Steel Bars Used for Fracture Splitting Con-Rods
Authors: Zhang Xian Zhong , Chen Qing Feng , Xiong Yu Zhang , Xu Zhu Tao
Published: June 2012

A failure investigation has been conducted on high carbon microalloyed steel used in engine fracture splitting con-rods. The fracture occurred when the as-rolled bars are cut down. The study involved the in-depth examination of the chemical composition, microstructures, mechanical properties and fracture morphologies of specimens from failed bars. Results indicated that the chemical composition of the as-rolled material, microstructure, and mechanical properties are within the range of the technical specification. Microstructure is ferrite-pearlite with dominance of pearlite due to the relatively high carbon content. SEM of fracture surfaces of failed as-rolled bars illustrates that the fractography is cleavage steps and river line pattern. It indicates that failure mode is brittle and the mechanism of fracture is cleavage. Microfracturography shows sulphur inclusions and oxides are the fracture initiation. The continuous network proeutectoid ferrite at the edge of fracture bar will prodigiously improve the brittleness and quickly bring stress concentration under dynamic loading conditions. Furthermore, coarseness and narrowband shape ferrite will induce to decrease toughness.
Study on Bimetal Compound Casting Technology of Hammers
Authors: Wang Hua
Published: June 2012

For the characteristics of the hammer handle is under bending stress and impact constantly alternating and the the main of the hammer is Withstand strong impact and friction in use，the paper designed a new type of composite casting process of hammerhead. It has two wear block imbedding in the below of the hammer ，and it set in on both sides of the axis of the hummer wiche with Inverted trapezoidal dovetail structure. The wear block was cast by high chromium cast iron, and it is properly heat treatment and surface cleaning before casting, but Into the mold after re-heated to temperature above 600 °C，At the same time，poured into the cast high-manganese steel quickly，so the block and hammer handle fused together，the block of composite hammer does not wear off in the use, and the wear resistance of the hummer improved significantly.
Modeling and Optimizing Rolling and Cooling Processing-Parameters for C-Mn-Si Economical Dual Phase Steel Produced on CSP
Authors: Tan Wen , Han Bin , Wang Shuize
Published: June 2012

In order to obtain the optimal rolling and cooling processes-parameters for producing C-Mn-Si dual phase steel on CSP line, computer-aid modeling austenite decomposition during laminar cooling is carried out in present paper. Effects of chemical compositions, finishing rolling temperature (FT7), isothermal holing temperature (HT) and isothermal holding time (t) on austenite decomposition are investigated. The optimal steel chemistry and rolling and cooling processing-parameters are obtained through the modeling. According to the modeling results, 580MPa grade C-Mn-Si DP steel is successfully produced on CSP line with 0.05~0.07mass%C,1.20~1.50mass%Mn, 0.50~0.70mass%Si, FT=820~840°C, HT=680~720°C,t=8~11s. Comparison of modeling results and industrial trials show that current modeling structure is able to model and optimize processing parameters for C-Mn-Si DP steel production on CSP line.
Effect of Annealing Time on the Microstructure and Texture of Interstitial Free Steel
Authors: Wang Zhi Fen , Han Rong Dong , Zhou Shun Bing , Yao Zhong Hai , Wu Li Xin
Published: June 2012

Effect of annealing time on the microstructure and texture of IF steel sheets was investigated. Average grain size, grain boundary character and recrystallization texture were measured by X-ray diffraction (XRD) and electron backscatter diffraction (EBSD) in order to clarify the effect of annealing time on microstructure of recrystallization process. The average grain size increased with increasing annealing time. With rising annealing time, the number of low angle boundary (0～15o) decreased due to the mergence of grain with sub-boundary. The //ND (-fiber) pole intensity had a highest value annealed at 60s. The annealing time played an important role in recrystallization process which affected the mechanical properties and microstructure of IF steels.
Influence of Austenite Grain Size on the Crystallography of Allotriomorphic Ferrite in a Low Carbon Steel
Authors: Bai Yin , Guo Hui , Yang Shan Wu , He Xin Lai
Published: June 2012

The influence of prior austenite grain size on the crystallography of allotriomorphic ferrite is investigated in a low carbon steel. The results show that as the prior austenite grain size decreasing, the fraction of allotriomorphic ferrites that do not keep K-S orientation relationship with any surrounding prior austenite grains is increased. It is observed that such ferrites usually form at the grain edges or grain corners. It is known that with the grain size decreasing, the fraction of grain edges and corners increases. It is suggested that the free energy of the defects at such nucleation sites is higher than that at grain faces, and the nucleation barrier of ferrite is lower. As a result, the possibility for the ferrite to form that does not have orientation relationship with all surrounding austenite grains is increased at such sites.
Field Emission of Gallium-Doped Carbon Nanotubes
Authors: He Hao , Yuan Chao , Liang Er Jun , Li Shun Fang
Published: June 2012

Field emission property of Ga-doped carbon nanotube (CNT) film has been studied and compared with those of un-doped, N-doped as well as B and N co-doped CNT films. It is found that the Ga-doped CNT film exhibits superior field emission property to the other films. The turn-on field for Ga-doped CNT film is well below 1.0 V/μm, lower than those for un-doped (2.22 V/μm), N-doped (1.1 V/μm), B and N co-doped (4.4 V/μm) CNT films. Its current density reaches 5000 μA/cm2 at 2.6 V/μm which is well above those for un-doped (1400 μA/cm2), N-doped (3000 μA/cm2) as well as B and N co-doped (2) CNT films at applied electric field of 5.7 V/μm. First principles calculations were carried out to obtain the binding energy and electronic nature altering of a CNT by Ga doping. It is shown that Ga-doped CNT (8,0) alters from semiconductor to intrinsic metal and a binding energy of 2.7527 eV is obtained. The field emission property can not simply be explained by the defect concentration, but can be understood by significant altering in the local density of states near the Fermi level introduced by dopants.
Study of the Ti-Mn-Al-Si-O-S Complex Inclusions Inducing Intragranular Acicular Ferrite
Authors: Yang Chengwei , Jiang Min , Wang Xinhua , Ou Tie
Published: June 2012

High temperature confocal laser microscope, FE-SEM-EDS and EPMA were utilized to study the Ti-Mn-Al-Si-O-S complex inclusion inducing IAF in Ti deoxidized steel. FactStage was also used to calculate the thermodynamics of inclusion formation. It was demonstrated that when the cooling rate is fixed to 5°C/s, IAF can be induced by complex inclusions which act as the core of IAF at 609°C. Microstructure of the complex inclusions is complicated. These inclusions are consisted of the TiOx-MnO core which is surrounded by MnO-Al2O3-SiO2 complex inclusions and small amount of MnS. The reason that Ti-Mn-Al-Si-O-S complex inclusions can induce IAF is that a Mn-depleted zone is formed by the core TiOx-MnO and the MnS around it. Meanwhile, the difference between MnO-Al2O3-SiO2 and austenite thermal expansion coefficients is tremendous is another principle element for the IAF formation.
Influence of Vanadium on Microstructures and Mechanical Properties of High Strength Normalized Steel
Authors: Tong Ming Wei , Yuan Ze Xi , Zhang Kai Guang
Published: June 2012

Considering the specialities of high strength normalized steel, the main roles of vanadium in normalized steel were investigated. The results show that adding vanadium can improve the strength and deteriorate the impact energy, but for vanadium steel, the strengths increase and the impact energies have no changing regulation with increasing vanadium. The microstructures of experimental steels are composed of polygonal ferrite and pearlite, vanadium can not refine ferrite grain size, most of them dissolve into the matrix, and the forms of precipitation in vanadium steel are complex carbonitrides. Grain refinement plays a greater role in improving the low temperature toughness of high strength normalized steels, the strength index is firstly considered in designing this kind of steels.
Effect of Strain Rate on Nb(C,N) Precipitation in Micro Alloy Steel Slab
Authors: Zhu Zheng Hai , Qiu Sheng Tao
Published: June 2012

It was analyzed by strain-induced precipitation model that Nb(C,N) precipitation in micro alloy steel slab was effected by strain rate during continuous casting process. The results are as follows: The changing of casting speed could effect the time for 5%precipitation of Nb(C,N), which was decreasing with increasing casting speed at certain temperature and strain rate. Slab strain and strain rate were too small in bending zone and leveling zone. The effect of slab strain rate on Nb(C,N) precipitation could be ignore when Nb(C,N) precipitation in continuous casting process was studied.
High-Strain-Rate Superplasticity of Big Grains in Spray Forming Ultrahigh Carbon Steel Contain 1.6wt.%Al(UHCS-1.6Al)
Authors: Wang Jun , Shi Hai Sheng , Zhang Jing Guo
Published: June 2012

Abstract: Spray forming UHCS-1.6Al material has a refined equiaxed pearlitic structure, which was necessary for high-train-rate superplasticity. During deformation, the cementite particles pin the grain boundaries and prevent the grains growing up. As a result it exhibited excellent high-strain-rate superplasticity, with a peak ductility of 187% occurring at a strain rate of 5*10-3s-1.
Research of the DWTT Fracture of X70 Pipeline Steel
Authors: Sun Ying
Published: June 2012

The DWTT fracture toughness of X70 pipeline steel with different content and grain size of polygonal ferrite was investigated. The results show that when the content of polygon ferrite is above 28%, the shear-area percentage of DWTT fracture begins to decrease instead of increase, while polygonal ferrite toughening effect weakens. It is the difference of the polygonal ferrite content that results in the difference of shear-area percentage of DWTT fracture.
Shield Performance of High Boron Alloyed Stainless Steel Composite Plate
Authors: Liu Jing , Xie Guo Liang , Zhang Ke , Han Jing Tao
Published: June 2012

The shield thermal neutron performance of two high boron alloyed stainless steel composite plates(HBASSCP) was studied by the method of neutron beam transmission of neutron source reactor. The testing results indicate that the shield performance of the composite material is heavily affected by the size and distribution of the boride. Although the radiationresistance of high boron alloyed stainless steel increases with boron content, but blocky and sparse hypereutectic boride will appear in matrix when boron content is high (more than 3%), and these borides are difficult to be broken during hot deformation, so the thermal neutron is easy to penetrate directly through the space and can not be absorbed effectively. The difference between the shield performance obtained from experiments and the theoretical calculation is small for HBASSCP containing hypoeutectic boride in core material, but it is great for HBASSCP containing hypereutectic boride in core material.
Creep-Fatigue Interaction Life Prediction for P91 Steel Based on Improved Elman Neural Network Model
Authors: Li Na , Yan Wei Ping , Ye Feng , Ma Liang Yu
Published: June 2012

A creep-fatigue life prediction model for P91 steel using Improved Elman Neural Network is founded based on the creep-fatigue experiment datas in this paper. The load keeping time is selected as the model input and the creep life or fatigue life as the output in the model. The prediction ability is validated from training the sample data. The results show the model has a very high prediction accuracy for training samples. But the model generalization ability is relatively weak, so the forecasting accuracy for test sample is lower than the training samples. Through increasing test sample number and decreasing the uncertain factors during the experiment in the follow-on working, the prediction accuracy and the model generalization ability will be increased.
Effect of Stabilizing Heat Treatment on Intergranular Corrosion Resistance of Welded Stainless Steel AISI 321
Authors: Mahmoudi Amir , Esmailian Mohammad , Aghamiri Seyed Eshagh
Published: June 2012

In this paper, to investigate the effect of stabilizing heat treatment for decreasing intergrular corrosion in welded AISI 321 steel by SMAW, at first, it was solution heat treatment in 1050°C and 3 hours , then it was stabilizing heat treatment in various times and temperatures for creating more chrome carbides which could not be created in first stage. Results indicated that, by increasing the temperature of stabilized heat treatment, more titanium carbides dissolves, while time increasing causes more creation of titanium carbides, decreasing of chrome carbides, and finally leads to increase of intergrnular corrosion resistance.
Study on Roll Wear Model for Hot Strip Mill
Authors: Guo Zhong Feng , Hu Jun Hong , Sun Xue Yan
Published: June 2012

Roll wear model for Hot Strip Mill (HSM) was researched and the factors affect roll wear are analyzed. The simulation program was compiled by program visual C++ language and work roll wear was calculated according to the rolling schedule. Calculation results shows that roll wear like box shape. Strip width affects roll wear clearly. The strip length is one of the important issues which affect roll wear. Work roll wear of F7 top roll middle get to 280μm after a rolling schedule. Roll wear curve calculated by program were good agreement with the wear curve got by high-precision grinder. The results show that the roll wear model has high accuracy.
Corrosion Behavior Analysis of Various Ions in the Soil to the X80 Buried Pipeline
Authors: Xu Shi Qi , Xie Rui Lin , Na Li
Published: June 2012

Abstract：Through physico-chemical analysis of soil under the buried pipeline, the corrosion influence factor of different ions such as 、 、 and on X80 has been studied. The result shows that when the ions concentration of 、 、 increases, the corrosion rate of X80 steel also rises and then reaches the maximum. After that, the corrosion rate begins decreasing. While for the case of ions, the corrosion rate of X80 steel keeps increasing with the concentration increase. Through detail analyzing the corrosion mechanism of different negative ions on buried pipeline steel and studying the soil corrosion rules, we can provide theoretical basis for the corrosion preventing work, which is very important and meaningful.
Development on a New Interstitial-Free Steel with △r ≤0.3
Authors: Pan Li Bo , Hu Yin Ping , Wei Xing , Ge Rui , Long An
Published: June 2012

Traditional IF steel is Ti-IF steel for low cost. Some car producer require IF steel to have good mechanical properties with low delta r (plastic stain ratio) value (△r) as well as high performance after welding. A new IF steel was developed by adjusting amount of Nb and Ti based on Ti-IF steel and employing suitable parameters in manufacturing processes. Annealing experiments were made to decide reasonable annealing temperature. The final products exhibit good isotropy with △r ≤0.3. This new type IF steel also had good performances after welding by analyzing results of some key parameters, which can totally meet requirement of car producer.
Experiment Study on Effects of Critical Factors on Quality of Prototypes in Fused Deposition Modeling
Authors: Peng An Hua
Published: June 2012

This paper presents an experiment investigation on the effects on the surface quality and strength of a model in FDM, of critical factors including stratification parameters, build orientation, brace structure, auxiliary brace, and defects in STL files. With experiments using MEM-300, the conclusions can be drawn that, no matter what the number of interval is, greater filling line width always easily lead to poor surface quality, and that when the demands on surface quality and strength conflict one another, the demands on the both must first be balanced to obtain the better economical processing program.
Effects of Composite Nickel-Base Boracic Brazing Filler on the Boride near the Brazing Seam of 316L Stainless Steel
Authors: Yu Su , Zhishui Yu , Zhi Yan , Jun Li , Guo Huang
Published: June 2012

Composite filler（1-x%）BNi-2+ x% BNi-5 with 3 different B content was used to braze 316L stainless steel. The boride near brazing seam was determined by energy spectrum, XRD Micro- area scanning and thermodynamics, dynamics calculation software THERMO –CALC to study the impacts of B content on boride type and quantity. The results showed Cr5B3 and Cr2B were found at and around brazing seam of 1# specimen and Cr2B were found at and around both 6# and 8# specimens. In addition, the Cr2B content of 6 # specimen was greater than 8 # specimen. With the increase of BNi-5 content and decrease of B in the brazing filler, the type and content of the chromium boride reduced.
Microstructure Transformation of Continuous Cooling of Nb-Ti Micro-Alloyed Low Alloy Steel
Authors: Bao Jun Cheng , Li Xin , Zhao Jie , Ning Bao Qun , Li Jian Ping
Published: June 2012

Through the thermal simulation test of the Nb-Ti micro-alloyed steel austenite cooling process and microstructure observation & microhardness test, the tests indicate cooling rates have effect on the phase transition and microstructure of tested steel, the critical quenching speed of Nb-Ti micro-alloyed steel is about 23°C/s with very good hardenability. With the increasing of the cooling rate, the beginning and ending temperature of phase transformation decrease and the ferrite structure content was decreased at room temperature. It’s easy to happen Bainite transformation at the beginning, and make the M block or flake M fine, which is to increase the strength and toughness of the steel.
Experimental Research on Mineral Processing Technique of a Brazilian Specularite
Authors: Wang Wei Zhi , Jia Qing Mei , Yang Chun Guang
Published: June 2012

Laboratory research on the mineral processing technique of a specularite ore from Baxi was performed, while the processes including gravity separation, low intensity magnetic separation(LIMS) -high intensity magnetic separation(HIMS)-gravity separation was adopted. The run-of-mine ore was milled till the -0.074 mm range accounts for 50% and treated through a LIMS – HIMS process, with the magnetic field strength of LIMS being 95.52 kA/m and HIMS,1.2T. As a result, an iron concentrate grading about 67.58% at a recovery of 96.21% can be obtained, which are rather good metallurgical performances. The iron concentrate with high grade also could be beneficiated by table separation, but its recovery is lower than it obtained from intensive LIMS – HIMS dressing.
Experimental Research on the Iron Separation from an Ultra Poor Iron Ore
Authors: Wang Wei Zhi , Chen Li Ping , Yang Chun Guang
Published: June 2012

Test was made on separating iron from a ultra-low-grade vanadium titanium magnetite ore by a process of tailing discarding at a coarser size，staged grinding and staged low intensity magnetic separation. The results show that when the raw ore is treated by permanent dry magnetic separator with low intensity magnetic separation at 12～0 mm size，qualified tailings of about 20% yield can be discarded．The coarse concentrate is grounded in two stages. With the first stage grinding size being 45% -200 mesh and the second stage，75% -200 mesh，and then treated by two stage low intensity magnetic separation．As a result，an iron concentrate with a TFe grade of 65.80%and an iron recovery of 47.74%can be achieved．
The Effects of the Sputter-Etching Parameters on the Formation of Conical Protrusions on the Surface of SUS304 Stainless Steel
Authors: Bai Tao , Zhang Qing Lian
Published: June 2012

SUS304 stainless steel samples were sputter-etched by a radio frequency (RF) magnetron sputtering apparatus. Correlations between the formation of conical protrusions on the steel surface and sputter parameters, such as sputter power, anode-to-substrate distance, argon gas flow ratio and sputter-etching time were discussed. The results show that the conical protrusion precipitates both uniformly and densely on the surface with the power being 600W, the anode-to-substrate distance being 50mm, the argon gas flow ratio being 50sccm and the sputter-etching time being 6h.
Study on Microstructures and Properties of 22Mn2SiVBS Steel on Different Cooling Rate
Authors: Wang Min , Xin Hong , Guo Shu Lan
Published: June 2012

Abstract:The microstructures and mechanical properties of 22Mn2SiVBS steel after austenitizing at 1280°C and then cooling in air and piled up after rolled were studied in this paper .the results show that when 22Mn2SiVBS steel cooling in air it can obtain the fine grain granular bainte and remain austenite,and piled up after rolled it can obtain granular bainte and proeutectoid ferrite. After heat treatment the strength and hardness is higher than the sample piled up after rolled, but the toughness is lower.
A Rational Way to Prepare BaTiO3 Ceramics
Authors: Luo Liang , Zhu Yan Jun , Song Ling Ling , Zhang Xiao Bo
Published: June 2012

A facile one-pot hydrothermal method has been developed for synthesis of porous and non-porous BaTiO3 ceramics using Ba(OH)2.8H2O, BaCO3 as barium source. In this paper, we research the effect of different barium source on the nanostructure of BaTiO3 ceramics in a solid state reaction, and the results indicated that the two different morphologies of BaTiO3 ceramics can be easily prepared by using these two different barium source. The phase composition and morphology of the as-obtained products were investigated by X-ray diffraction and field emission scanning electron microscopy (SEM).
Preparation and Properties of Cf-TiB2-Cu-Graphite Composites
Authors: Xu Shao Fan , Xu Shao Ping , Zhu Cheng Nan , Yuan Chuan Yong
Published: June 2012

Copper-plated TiB2-Cu-graphite composite, Cf-TiB2-Cu-graphite composite and Cf-copper-plated TiB2-Cu-graphite composite with the same TiB2 content were prepared by the powder metallurgy method. Physical and mechanical properties of these composites were tested. The dry friction tests of the composites under sliding velocity of 10m/s and load of 4.9N were conducted for 36h. The results show that the properties of the Cf-copper-plated TiB2-Cu-graphite composite such as electric conductivity, hardness, bending strength and wear resistance are increased remarkably than those of either Cf-TiB2-Cu-graphite or copper-plated TiB2-Cu-graphite composites.
Effect of Roasting Process on the Properties of Alumina-Based Ceramic Core
Authors: Wang Li Ge , Zuo Bin , Zhu Guang Zhi , Wang En Ze
Published: June 2012

The roasting process of leachable alumina based ceramic core has been systematically studied in this paper, the results show that, the roasting process should be divided into two parts, i.e., dewaxing process and sintering process, and the plasticizer can be removed completely from the ceramic green body by the dewaxing process with little residue left behind. The sintering temperature and mineralizer are the decisive factors to ensure the strength of ceramic core. The apparent porosity of ceramic core will decrease obviously while the room temperature flexural strength will increase when the sintering temperature is rising. The room temperature flexural strength can exceed 14MPa when the ceramic core samples sintered at 1550°C. The ceramic core samples will present excellent comprehensive properties when the sintering temperature is 1550°C and the added quantity of SiO2 is 8~10%, i.e., apparent porosity is 44.7~46.9%, bulk density is 1.93~1.99 g/cm3, room temperature flexural strength is 10.65~11.93MPa.
The Influence of Al2O3-AlN Compound Additive on the Crystallization Characteristics and Properties of Fused Quartz Ceramic Materials
Authors: Shen Shu Bin , Bu Jing Long , Yu Li Xue , Chen Jun Xing , Wang Zhi Fa
Published: June 2012

Fused quartz granule (d50=10μm) was used as raw material, and Al2O3-AlN (1:1, in mass) was used as additive with dosages of 1 wt%, 2 wt% and 3 wt%. The crystallization characteristics of fused quartz ceramic fabricated in reduction atmosphere at 1300°C, 1350°C and 1400°C for 1h has been investigated by thermal expansion ratio and XRD. The results showed that the crystallization characteristics were markedly improved by 1 wt% AI2O3-AIN compound additive. 1 wt% Al2O3-AIN had obvious effect on inhibiting crystallization of the samples sintered at various temperatures. The apparent porosity, bending strength and SEM of the samples were also examined. The results showed that the samples with 1 wt% AI2O3-AIN had the lowest apparent porosity among the samples containing Al2O3-AlN, the highest bending strength, and the sample AA1 sintered at 1350°C had more compact microstructure, which indicated that 1 wt% Al2O3-AlN was conducive to sintering of fused quartz ceramic materials. It can be deduced that the 1 wt% Al2O3-AIN compound additive plays the excellent role on inhibiting crystallization and promoting sintering of fused quartz ceramic materials.
Study on Preparation and Property of Woodceramics
Authors: Zhou Wei Hong , Yu Yun Shui , Xiong Xue Liang
Published: June 2012

Woodceramics were prepared by using wood powder and furane resin. TG Analysis techniques were adopted to study pyrolysis behavior of wood powder and furane resin. Microstructures of woodceramics were studied by using scanning electron microscopy (SEM) and X-ray diffraction(XRD). The effect of carbonization temperature on carbon yield ratio，volume shrinkage ratio and volume electrical resistivity of woodceramics were investigated. The results show that carbonization temperature has a significant effect on the microstructure of woodceramics. When the carbonization temperature increases, the volume shrinkage ratio increases, and the carbon yield ratio and the volume electrical resistivity decrease.
Microwave Dielectric Properties of Low-Temperature Sintered Ca[(Li1/3Nb2/3)0.95Zr0.05]O3−δ−0.04TiO2 Ceramics
Authors: Xiong Hui , Xiong Gang , She Cui Hua
Published: June 2012

The effects of B2O3 on the sinterability and microwave dielectric properties of Ca[(Li1/3Nb2/3)0.95Zr0.05]O3−δ−0.04TiO2 (CLNZ−0.04TiO2) ceramics were investigated . B2O3 doping can effectively reduce sintering temperatue by 150~200°C. The temperature coefficient of resonator frequency τf increased with an increase of B2O3 content and sintering temperatue. When B2O3 of 2wt% were added, the optimum microwave dielectric properties: εr =31.8,Qf =17240GHz and τf = − 5.9×10−6/°C were obtained at the sintering temperature of 950°C.
Effect of MgO on the Microstructure of Polycrystalline Nd:YAG Ceramics and its Action Mechanism
Authors: Wang Bo , Cao Quan Xi
Published: June 2012

1.0at% Nd:YAG polycrystalline ceramics were fabricated with different sintering adds by solid-state reaction and vacuum sintering method. The optical transmittance spectra of the samples were measured using V-570 UV spectrophotometer. The microstructure and the grain size of the samples were characterized by Scanning electron microscope. It is found that the sample with 0.5wt% SiO2 and 0.5wt% MgO had the best transmittance, the most densification and uniform grain size, and the grain size decreased with the increasing MgO. Effects of MgO on the microstructure of YAG and its action mechanism have been investigated.
Method of Improving Dielectric Properties of AlN Ceramic
Authors: Ma Hui Na , Yang Zhi Min , Du Jun
Published: June 2012

AlN-Mo composite ceramics were prepared by spark plasma sintering (SPS) with AlN and Mo, introduction of Mo particles into the AlN matrix was through direct current magnetron sputtering, sol-gel and blending technology methods. The effect of Mo particles on densification, electrical conduction and dielectric properties of AlN ceramic was studied by XRD, SEM, dielectric frequency spectrum. The results indicate that dielectric constant of AlN-0.26vol.%Mo composite ceramics obtained by sputtering increase by 22.5% at 1MHz as compared to the pure AlN sample; AlN-18vol.%Mo composite ceramics prepared with Mo powder coated with Al2O3 show insulator character and good dielectric properties; dielectric constant and loss of the composite ceramics increase with increasing the content of the elongated shape Mo particles, the highest dielectric constant and loss will be obtained when AlN-12vol.%Mo content is 30wt.% ( =98.41, tgδ=0.018 at 1MHz), the value of electrical resistivity decreases rapidly from 1.32×104 to 3.16×101Ω•cm when AlN-12vol.%Mo weight fraction increases from 30% to 40%.
Preparation and Application of Magnesium (II) 2,2,2-Trifluoroacetate as an Efficient Catalyst for the Catalytic Preparation of 1-Amidoalkyl-2-Naphthol Derivatives
Authors: Mohammad Shafiee Mohammad Reza , Moloudi Raheleh , Teimouri Jervekani Najmeh , Ghashang Majid
Published: June 2012

Magnesium 2,2,2-trifluoroacetate [Mg(OOCCF3)2] has been prepared from the reaction of trifluoroacetic acid and magnesium chloride and was tested for its catalytic activity in the multi-component reaction of aldehydes, 2-naphthol and an amide (or urea). This methodology results in the synthesis of a variety of 1-amidoalkyl-2-naphthol derivatives in high yields. The catalyst can be recovered and recycled without a significant loss in the catalytic activity
Ultrafine W-Cu Composite Powder Research Progress
Authors: Gao Jian Xin , Li Yun Gang , Tian Ying , Jiao Yang
Published: June 2012

With the increased market demand of W-Cu composite materials, the research of ultrafine W-Cu composite powder is gradually in-depth, and some achievements have been made. This article describes some ultrafine W-Cu composite powder preparation methods in recent years, such as the mechanical alloying, oxide co-reduction, mechanical thermal chemical method, homogeneous precipitation method, spray drying, sol-gel method, etc. We simply analyzed the advantages and disadvantages of each method.
Effect of Cr and Ni Contents on Microstructure and Properties of High Boron Stainless Steel Composite Plate
Authors: Liu Jing , Zhang Ke , Xie Guo Liang
Published: June 2012

Two high boron alloyed stainless steel composite plates(HBASSCP) which have different Cr and Ni contents were prepared by composite casting and hot rolling process. By means of metallographic observation and x-ray diffraction analysis, the matrix microstructure of calding and core is ferrite and the boride phase in core material is identified as brittle Fe2B for HBASSCP which has lower Cr and Ni contents, while the matrix microstructure of calding and core and the boride phase are mainly austenite and (Fe,Cr)2B respectively for HBASSCP which has higher level of Cr and Ni contents. After solution treatment, ferrite had changed into martensite which do not have plasticity for composite plate with lower Cr and Ni contents, but the elongation and the tensile strength of HBASSCP with high contents of Ni and Cr has reached up to 12.45 % and 558MP respectively. The mechanical properties has met ASTM standard specification for borated stainless steel plate for nuclear application.
Supercapacitor Fabrication by Titanium Alloy
Authors: Chen Chien Chon , Chen Po Chun , Zou Jun , Hsieh Sheng Jen
Published: June 2012

In this paper, we used a simple process of anodization fabrication TiO2, TiO2, TiO2-MoO3, and TiO2-Ta2O5 nanotubes. Those high dielectric constant and large surface area of NT materials are suitable used for the ultracapacitors. Based on the nanotube structural characteristics such as pore diameter, porosity, and tube length, we also investigated and calculated the NT specific capacitance.
Reservoir Fracture Characteristics and its Influence on Oilfield Development in Chang 4+5 Formation in Southern Puziwan Area
Authors: Zhang Kui , Chen Jian Wen , Zhou Yang Fan , Han Peng Gang , Huang Qiong
Published: June 2012

Natural fractures controlled by the palaeotectonic stress field and artificial fractures controlled by the current stress field totally determined the distribution of the seepage system in super low permeability reservoir. Synthetically evaluation of the influence of fractures on oilfield development and the research on regularity of natural fractures distribution and the effect of stress field on the fractures are made in this paper, which is of important theoretical and practical significance in improving the development effect in super low permeability reservoir.