Abstract: The regularity of liquid steel temperature during BOF tapping to the tundish process was studied. With the neural network theory, a mathematical model for forecasting the temperature change of molten steel and its non-lineal functional relations with the influencing factors during CC have been established. With this model, the steel temperature in the CC process can be predicted more correctly.
Abstract: The study on direct reduction process of pellet containing carbon with the addition of Zn-Pb-bearing iron and steel plant dust shows that the reduction time and pellet basicity have obvious effect on the evaporation of lead and final metalliztion degree of pellet.The reduction temperature has significantl influences on the lead and zinc evaporation ratios and on final metallization degree of pellet.The optimum parameparameters obtained are reduction temperature of 1 250℃, reduction time of 25 minutes and pellet basicity of 0.9.
Abstract: A control technology of magnesium content in CrNiMoV steel during ESR process has been studied. The experimental results show that the optimum slag (mass frictom) constitution is 62%CaF2-10%Al2O3-12%CaO-16 %MgO and the amount of deoxidiser added is 1. 5g CaSi per kilogram of liquid steel. The higher magnesium content of electrode and higher remelting current is beneficial for obtaining remelting ingots with predicted magnesium content.
Abstract: The experiments on the foaminess of the CaO-MgO-Al2O3-SiO2-CaF2 refiniug slag system have been carried out.The obtained results are as follows: (1) relative foaming height linearly increases with the increasing of the flowrate of blowing gas; (2) the proper content of MgO is about 11% when slag basicity B<2.5 and it should lower when slag basicity will be higher, (3) the better content of Al2O3, (MgO)+(Al2O3) is 15% and 20%~26% respectively at the range of lower basicihes; (4) the effect of slag basicity on the foaminess is complex and its ophmizing value is 1.9 at the specific contents of MgO, Al2O3 and CaFe2.
Abstract: A two-dimensional heat transfer model was developed to calculate the mould wall temperature field under normal operations condition and to determine its changing behavior when breakout occured. On the numerical simulation of sticking type breakout process and the breakout related wall temperature evolution, parameters of prediction were suggested.
Abstract: A new process by which an extra low-carbon and high strength bake-hard-ing with very high r-value can be produced is presented. The sheet produced by the process shows the same strength and bake-hardenability as that by conventional technology, but its r-value increases of 2.67.
Abstract: The stain-induced microstructural changes of Fe3Al-based alloys during room temperature deformation and high temperature creep were investigated. The results illustrated the strain-induced disordering occured during room temperature deformation. Creep strain could induced two opposite processes, which are strain-induced disordering and creep recovery-induced reordering. These two opposite creep induced processes during creep result in reducing the influence of primary microstructure on the rupture life.
Abstract: The creep curves of heat resistant steel 12Cr1MoV was inveshgated. By constant stress creep tests. The creep curves of consent stress creep are quite different from that of constant load creep. The original θ-Concept Project procedure can be validared to successfully describe the constant stress creep curves but not constant load creep. A modified θ procedure was developed. This approach can successfully described both constant stress creep and constant load creep curves. The new approach leads to a great improvement in accuracy of long term prediction of extrapolation due to validation of a great number of existing constant load creep data.
Abstract: A on-line computer system is setup to monitor the life of pipeline in power station. The methods of life prediction which is used by this system is recommended and the fundation of the system is also discussed.
Abstract: The etching interaction of Fe with diamond was studied after sintering at 950 ℃ for 6 min. According to the result of AES C KLL line, the state of carbon near the diamond-iron interface was determined to be considered as graphite but not Fe3C. Carbon atom is dissolved from diamond crystal lattice into iron.
Abstract: Fine grain cast IN718 compressor blade form abroad has been analyzed.There is no columnar grain, uniform equiaxed grain, less segregation and no Porosity cast defect in essence in the section of blade body with fine grain, in which grain size is about ASTM 2~4. Its microstructure is approachable to that of forging. It is hopeful to achieve the goal of replacing forging by casting.
Abstract: Based on the principle of BP neural networks, the rolling force model is established after thoroughly analyzing and reprocessing the data of 1350 mm aluminium foil mill. It states that the difference between the output of artificial neural networks rolling force model and the real value is in the order of 3 percent. The model reflects the real feature of process.
Abstract: The concurrent proccessing technique for expert systems of optimization modelling and algorithms selection which is a key part in the design of the intelligent optimization software system(IOPS) was introduced. In addition, it also describes the controlling strategy for autonomous decentralization, concurrent design and information sharing, that is adopted in the sub-systems, and expounds to play the role in the implemening automatizatio of the optimal design by them.
Abstract: The cross wedge rolling mill's hydraulic screwdown imitative experimental device is used for simulating practical system on parameters and control method determination.The component and mathematical model of the imitative experimental device and its performance analysis are introduced.
Abstract: An intelligent control plan for the secondary cooling of continuous casting of slab was put forward. An off-line simulation of the system by using neural networks combined with fuzzy logic control is provided. The results show that the intelligent control system can not only control the surface temperature of the bloom of the secondary cooling but also has a good ability of self-adaptation and self-learning.
Abstract: According to classical system engineering optimal performace of the analog regulator, the digital regulator parameters are directly setup. The 2 order and 3 order dynamic Performance are optimized. The adaptive control technology is applied when the object model is time-var parameter system. The object model parameters are identified by on-line close loop method. The digital PID regulator parameters are also auto-setup.
Abstract: A method of building expert systems with fuzzy-neural technique is proposed.The technique of the knowledge dissolved in a neural network non-searching inference have been researched. The membership functions for the input virable have been generated by a triple separation. The simulation experiment results of expert system in the heating furnace show that the inference speed is fast and the result is satisfactory.
Abstract: To guarantee the convergence of the algorithm, the short form of Wolfe's method requires the coefficients of the objective function and constraint equations to satisfy some specific conditions. The above conditions of the convergence theorem can be eliminated by the improved method.
Abstract: A new idea of protecting computer viruses is developed. It is basic idea to use Int 08H monitorring the vector table of interruptions and to use Int 13H controlling the reading and writing operations of disks so as to protect any physical addresses of disks from being instantaneously read and written by viruses.
Abstract: The spin valve multilayer, consisting of Ta/NiFe/Cu/NiFe/FeMn/Ta, with giant magnetoresistance(GMR) has been successfully produced by magnetron sputtering. It is Possessed of good properties. The magnetoresistance ratio MR>2% at room temperature, the coereivity of free layer Hcl< 160 A / m, shift field Hf < 800 A / m and the biasing exchange field Hex≈20·103 A / m. As a new magnetic functional malarial, these properties can meet the requirement for preparation of magnetic field sensors with high sensitivity, for example in magnetic recording magnetoresistance read head.
Abstract: The dissolution equilibrium of Bi vapor in liquid iron and the interaction effect of third element were conducted in a sealed Mo reaction chamber by vapor pressure method. The relationship between the standard solution Gibbs free energy of Bi in liquid iron and temperature obtained can be expressed.The interaction coefficients of third elements on Bismuth in liqind iron at 1 873 K can be deduced.
Abstract: The determination of CaO content in columbite and steel cinder with flame atomic absorption spectrometry is studied. EDTA+TEA is used to eliminate the interferences, in HCl media, with La as releaser.The methods of sample treatment and the CaO in remainder undissolved in acids have been conducted. The result of the determina-determination and recovery of CaO shows that the ho of recovery is 100%~102 %, R.S.D<2 %.
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
