Abstract: In a certain environment,the performances of the systems depend on its structur,and the performances of the science subject are similar.The book《Energetics of Materials》is going to be published soon,this book is a new edition of "Energetics of Alloys" published in 1985.The system contents and aphorisms of the new editorial hoof are introduced briefly.
Abstract: Condition to keep bubble flow pattern is analysised based on two-phases flow pattern.A main factor to keep high holdup bubble flow is shown.Pressure equation is set up by hydrostatics method for bubble flow pattern. Relationship among holdup Φ,negative pressure Pv in suction chamber, fluid velocity UL are presented.
Abstract: The bubble velocity was determined in liquid-gas two-phase flow of downflow pipe of LHJ column, using particle dynamics analyzer(PDA) velocimeter.Bubble turbulent velocity distribution on radial and axial direction in downcomer was got first time. It proved that the bubble motion is in violent purbulent pattern in the case of foam flow. The theoretical basis was established to reveal the mechanism of minerization, set up mathematical model and scale up coltnmn.
Abstract: A new concept of "mining areas" is defined in accordance with sustainable development, the characteristics of mining areas development are analyzed, and the development Process of mining areas is divided into forming, development and transforming-production Stages. Based on this, at first, evaluation index system for unsustainable development is built, that is mullet-level system consisting of objective, criterion, index levels, and 28 sub-index. Second, It is put forward evaluation of sustainable development of mining areas belongs to time-order, mullet-level and mullet-objective problems. Therefore."Time-order, mullet-level, mullet-objective incidence analysis method" were applied to evaluating present situation sustainable development of mining areas,improved duality-contrast-analysis method to determining the weight of every evaluation objective for forming, and development stages of mining areas. At last, a practice example "Tie Fa mining areas" was given. Every feasible development pattern for the mining areas in forming Stage was evaluated.Based on the evaluation result, corers pounding counter-measures for enhancing the sustain able development capacity of the mining areas are discussed.
Abstract: The measurement result of actual strain and stress of the cooling wall in the blast furnace at high temperature state was obtained by the method of brittle coating and strain gauge line.Its showed that the stress is higher in central position than in the peripheral position because of the nonuniform distribute of water pipe.The tendency and order of calculation result is the same as the measurement.Its application leads to a new measurement method for calibrating the theory calculation result of the stress and strain.
Abstract: The resisting ability of gunning material for blast furnace to CO corrosion was invesitigated under the pure CO and the mixed gas condition through adding hydrogen into pure CO. A standard for testing the resisting ability of refractory to corrosion with mixed gas instead of pure CO has also been discussed. The results showed that the addition of hydrogen acclerates the CO corrosion on gunning material and the corrosion degree of refractory with the pure CO,200 h is same as that with the 95%CO + 5%H2, 24 h. So, It is reasonable to use 95%CO + 5%H2, 24 h instead of pure CO, 200 h to test the resisting ability of refractory to CO corrosion.
Abstract: The mechanism of "white band" and central carbon segregation formation of high-carbon chromium bearing steel concasting billets have been discussed.Comparative tests of metallurgical quality and fatigue property between the concasting steel and ingot casting steel showed that the carbon segregation (wc/wco) in steel produced by concasting process was 0.92~1.10 and the fatigue life of the former steel was equal to that of the latter steel.
Abstract: In accordance with the thin-slab caster mould of Lanzhou I&S Co., the effects of structure, immersion depth, outlet angle and shape on the fluid flow in mould by visualizing the fluid flow and measuring the wave amplitude and impetus under high speed casting have been studied. The results can provide theoretical foundation for choosing reasonable structure of SEN.
Abstract: The artificial natural net can used to predict the property of the strip formed in the molten steel during inverse casting. The property including in casting thickness and new organized grain are comprehensively forecasted. The influences on the property are discussed by the main operated factors during inverse solidification. The new method to predict the property is provided. The new organized grain little changes with molten steel superheat, mother sheet thickness and dip time,but the cast sheet thickness greatly changes with these main operated factors..The predicted result of the model corresponds to the experienced result.
Abstract: The metallographic structure, the elements segregation and the grain size number of the composite stainless steel strip were discussed.Based on the results the conclusions were follow:the metallographic structure of composite stainless steel strip is ferrite and carbide,the structure of mother strip is ferrite and martensite,and the structure of the transition region is ferrite and pearlite.The width of the transition region is about 50 μn; the factor grain size of stainless layer is between 5.8 and 6.3.
Abstract: The flowing behavior of molten steel was studied on the c. c. simulator with two pairs of magnetic poles imposed. Ph-Sn-Bi molten alloy and silicon oil were simulated as molten steel and slag, respectively. It was shown that a ring of electric current is created in molten alloy by the effect of two pairs of magnetic poles. As a result, the flow velocity from the outlet of submerged entry nozzle in mold is suppressed effectively and the erosion of shell near narrow face of the mold is weakened. Furthermore, the meniscus fluctuation can be stabilized. But this Phenomenon is not more obvious when the magnetic flux density is increased to some degree.
Abstract: A measurement method for the rheological characteristic of metallurgical melt by means of a modified rotational viscometer with variable speed used at high timperature was proposed. The rheological characteristic of molten slag measured with the modified viscometer has been investigated. Therefore, revisory method of the rheological parameters has been put forward and the revisory constitutive equations have also been camed out.
Abstract: A new process of low temperatUre Al2O3 suspension electrolysis for producing aluminum in low melting point fluo-chloride system was investigated. Current efficiency (η)expression deduced from experiments on 20~80A electrolysis cell showed that main effects on η are the cell current and the surface of aluminum produced.Increasing cell current and diminishing aluminum surface.can both make η increase. On an electrolysis cell of about 100A capacity with the fine γ-Al2O3 (media diam. 1.22μm) and the mixture in which F-/Cl- molar ratio was 1 at 750℃,aluminum metal was obtained with 86.3% current efficiency and 11.73 kW. h specific energy consumption.
Abstract: The subsystem on Kinetic Prediction of Gas/Solid Reactions, KinPreGSR, in Intellectualized Database Management System for Kinetics of Metallurgy (IDMSKM) was presented.The application of Windows as working bench, Visual C/C++ and Foxpro as working languages ensures the graphical and intellectuyl features of KinPreGSR.The interface design combining the model classification, organization with the characterization description of the reaction system links the information to be predicted with the characterizations of the reaction system.With the thermal decomposition of CaCO3 as an example, the main principles and the method for the assessment of apparent activation energies in KinPreGSR were stated.
Abstract: The experiments were carried out at 1 600℃ and normal pressure under an Ar atmosphere. The result showed that the copper content (mass fraction) in steel melt of 400g was reduced from about 0.5% to 0.31% and 0.38% respectively when 0.7~0.8g of NH4Cl or (NH4)2C2O4 as the decopperizing agents added to the melt. However it is very difficult to reduce the copper content below 0.3% without reducing the pressure of the reaction system.
Abstract: Several factors which causing the mass changes of the steel melts in the crucibles have been analysized in detail, during such experiments on decopperization by adding ammonium compounds into the steel melts to imitate the wire-feeding in steelmaking. On basis of this, an expressin of the relation between the copper content of the melt and the amount of added decopperizing agent was developped, by virtue of which the data were reprocessed. The obtaied results are more reasonable than those not reprocessed.
Abstract: The effects of deformation at 900℃ and 780℃ on the microstructure and mechanical properties of the bainitic ferrite formed by isothermal treatment have been studied. The samples include three steels:an ultra-low carbon microalloying clean steel containing Mn, Nb, Ti, B, commercial steels X60 and XTE355. After press 70% at 900℃ or 780℃ followed by isothermal holding at 500℃ for 500 s or 800 s, samples of all three steels showed very fine structure and great improvement in their strength.The smallest overage grain size, which is 0.99μm and 1.02 μm along X and Y direction respectively, is obtained in a X60 specimen pressed 70% at 780℃ before isothermal holding.But the greatest improvement in strength is shown in the clean steel specimen owing to its large fraction of bainite structure. Mechanisms affecting microstructure and strength in the steels,which were deformed at near Ar3 or between Ar3 and Ar1 temperature before isothermal transformation, are discussed.
Abstract: The Principle and the characteristic of the Neural NetWorks and the Traditional Pattern Recognition are introduced and compared. A forecast module for phases and performances of o'-Sialon-BN composite has been made with acquired experiment data by modified Neural Networks.Then the technical condition for synthesizing o'-Sialon-BN composite has been investigated.
Abstract: Based on the solidification fundamental principle given by Mullins and Sekerka, sets up the differential equations of solidification interface morphology stability kinetics in the electric current.The effects of electric current strength on stability and the homologous disturbance frequency of stable state in solidification process are discussed.On the basis of these analyses, the relationship of directional solidification microstructure morphology and the electric current strength is also discussed.
Abstract: The interfacial shear property of steel-aluminum solid to liquid immersing bonding plate after being rolled was studied and the relationship between interfacial shear strength and relative reduction was determined.The result proved that:for the bonding plate made up with 1.2mm-thick 08Al steel plate and 1.0 mm-thick aluminum layer, when the relative reduction was 2.73%,the interfacial subsidiary stress could be eliminated and thus the maximum interfacial shear strength 83.5MPa was obtained.
Abstract: Single-and Multi-layer InAs quantum dots grown on (001) GaAs substrates by molecular beam epitaxy (MBE) were studied by transmission electron diffraction (TEM) and the structural properties of the quantum dots were discussed. The results indicated that multi-layer quantum dots are aligned vertically, in addition, the density of the dots decreases and the size of dots becomes uniform when the number of layers increases.In this experiments, the thickness of InAs dots sheets and GaAs space layers in samples with five dots sheets are the best condition to form the strain field needed by growth of self-organized quantum dots.
Abstract: The relationships between ocean corrosion of metal and the ocean environment were studied by grey relational analysis methods. Under the submergence, the main factors of corrosion for A3 steel in ocean environment were found in accordance with grey relation grade. Neural network was applied to set a madel of ocean corrosion to A3 steel. Then the model is used to predict the corrosion rate of A3 steel in the new ocean environment and a satisfied result is obtained.
Abstract: On the basis of large amount of measured rolls contour, the roll wear pattern of every stand is obtained in hot wide strip mill.A new reasonable appraisal of the convenhonal rolls and improved rolls contour is introduced by roll feature method.
Abstract: A analytical synthesis method of four-bar linkage in the special configtnation, in which the coupler curve has a four-point contact with its tangent (Ball's point), is Presented.With this method, the point which is on the expecting straight-line, the direction and two frame points,can be given beforehand.And some synthesizing formulae are derived and some synthesizing examples are given. The results have proved that the formulae are correct.
Abstract: The concept of efficiency function is defined to describe the flatness control characteristics of various actuators on cold mill. A new flatness control strategy based on efficiency function is introduced and its effect in flatness control is evaluated.
Abstract: In order to distinguish chaotic signal from stochastic signal, a new improved algorithm is proposed to overcome the shortcoming of the G-P algorithm and its improved form. The determination of the no-scale interval is simplified when the new algorithm is used. Moreover, the judgement for the saturation of the correlation dimension is realized objectively. The effectiveness of the new algorithm is illustrated by simulation samples.
Abstract: Analyze and explore about the actuality of data mining and the trend of knowledge discovery system, and presents new conception on the con non of general framework and specific problem.
Abstract: A new object-oriented environment for visualized engineering optimum design will be developed. The aims of this project are to develop the traditional optimum techniques toward the geometry and symbolic optimum methods, form the theoretical bases of the discipline of generalized geometry optimization. So the process of optimum design will be simpler and the efficiency will be faster.
Abstract: A improved technique of magnetic guiding in AGVS was presented. The algorithm and program based on this technique was established. The result proved that this mew method have high feasibility and low cost.
Abstract: In order to restrain the harmful effects of load disturbance on the high speed wire rod continuous rolling mill by direct current speed governing system, a discrete load disturbance observer and forward feedback disturbance compensation direct current speed governing system were applicated, and the restructured load fluctuation was applied to minute tensile force control. The experiment on the spot showed that the designed system improves the dynamic and static performance of the speed governing system, lower the dynamic and static state velocity jump and loss, so the quality of rolling wire is improved much more, and reduce the rate of waste production.
Abstract: Joint Time-Frequency Distribution is fit for the analysis of transient and non-stationary signals such as engine surface vibrations.By use of Time-Frequency Analysis,the result of tangible benefits can be obtained on Time-Frequency graphics when detecting knock from the signals generated by these transient phenomena in diesel engines.
Monthly, started in 1955 Supervising institution：Ministry of Education Sponsoring Institution：University of Science and Technology Beijing Editorial office：Editorial Department of Chinese Journal of Engineering Publisher：Science Press Chairperson：Ren-shu Yang Editor-in-Chief：Ai-xiang Wu ISSN 2095-9389CN 2095-9389
