Abstract: The paper is divided in two parts. Part one involves the problems of failure mode identifications of the pit slopes. A simple stereographic diagram is given, which can be easily used to identify all of the possible failure modes of the given slopes. Four practical slope failures of different modes are mentioned in part two, showing the usefulness of the diagram. The mechanisms of the failures are briefly discussed too.
Abstract: This article is rewritten through retreating even more equilibrium data of desulphurization on the basis of the same title paper published in the proceedings of The First Chinese Conference on Phyngsical Chemistry of Process Metallurgy in 1962. As a result of using thermodynamic data for di fferent binary （MeO-SiO2） Slags at variaus temperatures, a satisfactory relationship between the constants of desulphurization and temperatures has been obtained.
Abstract: The tundish is the important metallurgical unit of the continuous castin-g. In order to incressing demand for steel of higher quality, effective mesur-es must be elaborated to remove the large non-metallic inclusions by optimizing fluid flow and renewal time of liquid steel in the tundish, making it possible to raise from steel melts. The paper presented the influence of liquid debit, teeming spout immer-sed in bath, deep bath, proper dam on the fluid renewal time and flow pattern in the tundish by the experiment of water model. Liquid depth and proper dam of tundish are very effective for renewal time and flow pattern in the tundish.
Abstract: The relationship between the manganese and niobium contents, the proce ssing parameters （heating temperature, rolling schedual, cooling and aging after rolling）, the microstructures, the mechanical properties and the fract-uve behalior of 06MnNb steels were investigated.By employing the procedure of lower heating temperature. optimizing rolling schedual and interrupted cooling with a cooling rate of 17℃ per second between 780°-600℃ a complex microstructure containing fine acicular ferrite and small amount of fine M/A inlands and granular bainite can be obtained.This complex microstructure is superior to ferrite pearlite structure is both yield strength and low temperatare toughness. The main factor defermining streugth and toughness-of steol is the mean diameter of acicular ferrite.The toughness of bainite dependsopon its parketsije.The amount and parket sije of gaunlar banite is affected by heating temperatare and amount of deetormation.
Abstract: In this paper, the generalized diakoptics for large-scale linear networks is extended to the nonlinear generalized diakoptics for large-scale nonlinear networks.On the other hand, the nonlinear generalized diakoptics is an extension of the nonlinear diakoptics. The later uses the f hybrid base and is applicable only to the nonlinear networks having no coupling between their y subnetworks N1 and z subnetworks N2. The former uses a generalized hybrid base and is applicable to the nonlinear networks having coupling between their y subnetworks N1 and z subnetworks N2.
Abstract: Crack formation of Fe-Cr-Al alloy in wiredrawing process has been studied by means of acoustic emiassion and electron microscopy techniques.It is found that the major reason is due to Hydrogen-induced cracking in wiredrawing deriction. As Carbide precipitates at grain boundary, Ductility of alloy is low.In addition, brittleness tranoformation temperture of alloy is high, Crack may be induced by thermal stress.
Abstract: stress corrosion behavior of the cast and forging steel with the same heat has been investigated.Results showed that the activation energy of crack growth of the cast steel was identical with that of the forging steel and was in agreement with the apparent diffusion activation energy of hydrogen in the steel.Both cathodic and anodic polarization increased the da/dt of the cast and forging steel but the influence of the cathodic polarization was much s-tronger. Correspondingly, the steady-stat hydrogen permeation flux increased steeply with increasing the polarization current, whether cathodic or anodic polarization. The KISCC of the cast steel was larger than that of the forging steel. It may be due to the fact that the steady-stat hydrogen permeation flux of the forging steel was twice as larger as that of the cast steel.The fracture modes of both cast and forging steel were clearly dependent upon K1 at the crack tip and a transition from dimple to quasi-cleavage or intergranular was observed on the fracture surfaces with decreasing K1.
Abstract: In this paper, have been discussed the condition and the order of forming the indusions in 35CNi3MV alloys by thermodynamic analyses. The inclusions correlated well with the resulf of calwlation observed in our experiments.That shows what inclusions can be formed in the investigative steel may be forecast by thermodynamic calculation.
Abstract: By taking the exact size of the conductivity cell as well as the resistance values at diffevent depth, the conductivity was calculated using the following equation:\[\begin{array}{l}\sigma = \frac{1}{{2\pi \Delta {\rm{h}}}}{\rm{(}}\frac{{\rm{1}}}{{{{\rm{R}}_{\rm{2}}}}}{\rm{ - }}\frac{{\rm{1}}}{{{{\rm{R}}_{\rm{1}}}}}{\rm{)ln(}}\frac{{{{\rm{D}}_{\rm{2}}}{\rm{ - m}}}}{{{{\rm{D}}_{\rm{1}}}{\rm{ - m}}}}{\rm{ \bullet }}\frac{{{{\rm{r}}_{\rm{1}}}}}{{{{\rm{r}}_{\rm{2}}}}}{\rm{)}}\\{\rm{or}}\\\sigma = \frac{{{{\rm{K}}^*}}}{{\Delta {\rm{h}}}}{\rm{(}}\frac{{\rm{1}}}{{{{\rm{R}}_{\rm{2}}}}}{\rm{ - }}\frac{{\rm{1}}}{{{{\rm{R}}_{\rm{1}}}}}{\rm{)}}\end{array}\]Therefore, the procedure of demarcating the constant of the conductivity cell by using a know solution can be omitted.With this new mefhod, the experimental procedure has been simplified and the results proved accurate.
Abstract: We applied the thermodynamic principle to analyze the thermodynamic condition for deoxidizing the oxide of Si-Mn. According to our result, we designed a new technigue, the surface of water-atomized Si-Mn steel powder deoxidized in pure N2 with thermoset resin. With the steel powder maintained at 1280℃ or 1330℃ about 120 minutes, the oxygen content can be decreased from about 3060 to 300P.P.M. In the meantime, we determined the relationship between the amount of the oxygen in steel powder and that of the resin in this reducing process. In this way,we solved the deoxidizing problem of water-atomized steel powder that contains Si, Mn and other difficult reduction elements undernon-Vacuum condition.
Abstract: A tantalum coating process on 45 steel by chemical vapour deposition was studied in the Ta-Cl2-H2 system.Deposit rate of tantalum associated with temperature and partial pressure of TaCl5 and H2 was investigeted.Coating stru-ctures examined by metallogaphy,x-ray diffraction and electroprobe analysis methods ware also described.Corrosion experimental results in 37.7% HCl and 63% H2SO4 Solution show that corrosion rate of the coated samples is 2-3 ord ers lower then that of uncoated samples.
Abstract: Krige’s method is a new approach for estimating ore resources.By this method calculation of the experimental semivariogram and Krige’s estimator can be simultaneously Carried out by computer automatically.Yet the experimental semivariogram are not well-suited with theoretical model, of which hand treatment is reguired.Theretore the whole process covering original data processing and estimation is still in stagnation to be automation. This paper statistically deals with correlation as well as distribution of Semivariogram.Primary conclusion is also suggested.
Abstract: The transition probability density function of stochastic decarbonization process is obtained by Forker-planck equations, which is deduced decarbo-nization kinetic equations with a random from rate coefficients.lt is asshown that the stochatic process does belong to Gauss-Markov process. The sugges tions of application of transition probability function to control end point carbon content for Oxygen steel making are presented.
Abstract: At present, the methods used for analysis and computation of industrial furnaces and combustion chamber include computational fluid dyna-mics, models of dynamics, models of turdulence,models of multiphase flow, models of turbulent combustion, models of radiation heat transfer of flames and numerical methods, and are made in combination with experimental research. The methods have been developed to a new level.The primary aim of this paper is to make a brief introduction of the recent developments in this area, and to show, through the introduction of a recent computation of anindustrial glass furnace in England, that the general method for computation of fluid flow, heat transfer and combustion within the furnace are sufficiently developed to constitute an important means of designing.
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
