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ONLINE ISSN: 1347-5460
PRINT ISSN: 0915-1559

ISIJ International Vol. 41 (2001), No. 7

  • Production and Technology of Iron and Steel in Japan during 2000

    Masayuki Hanmyo

    pp. 655-669

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    DOI:10.2355/isijinternational.41.655

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  • Perspectives of Research on High-speed Conventional SlabContinuous Casting of Carbon Steels

    Mikio Suzuki, Makoto Suzuki, Masayuki Nakada

    pp. 670-682

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    DOI:10.2355/isijinternational.41.670

    Abstract

    Two decades ago the casting speed of the conventional slab continuous caster was increased stepwise to a level over 2 m/min. Henceforth, the casting speed has been remained a similar level. In this review the reasons for constraining the casting speed are discussed. As a result the constraints of the high-speed casting are thought mold powder entrapment and longitudinal facial crack occurring in high-speed casting.
    Some measures to prevent the mold powder entrapment and the longitudinal facial crack are discussed. Resultantly the research issues we should develop are considered such as prevention of alumina built-up in a submerged entry nozzle, control of fluid flow in a mold and control of heat transfer through mold powder film interved between a solidifying shell and a mold wall. They are most important to realize the high-speedcontinuous casting of conventional slab.

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  • Numerical Computation of Electromagnetic Fields in Metals Using A Modified Finite-difference Time Domain Method

    Zhong-Dong Qian, Ben-Wen Li, Guang-Lin Jia, Ji-Cheng He

    pp. 683-688

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    DOI:10.2355/isijinternational.41.683

    Abstract

    The Gandhi's scaled-frequency FDTD (finite-difference time domain) method for electromagnetic fields of low frequency was modified, and so can be adaptable to the numerical computation of electromagnetic phenomena in metals. The computational results by a simplified model agreed well with the analytical solutions. A new treatment for the interface of metal and dielectric was also presented, further how and why it is was explained. The low-frequency electromagnetic fields were computed successfully due to this treatment. The computational results are in excellent agreement with the experimental ones.

  • Suppression of the Vortex in Ladle by Static Magnetic Field

    Jun Won Suh, Joonpyo Park, Hoyoung Kim, Zin Hyoung Lee

    pp. 689-695

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    DOI:10.2355/isijinternational.41.689

    Abstract

    The vortex formation in draining the melt in ladle can be suppressed by the reduction of the tangential flow velocity of the melt. Two magnetic devices were designed in order to reduce the tangential flow velocity and tested with wood metal melt. One consists of 4 permanent magnets (PM device) and the other consists of an electromagnet (EM device). Magnetic flux density around each device was calculated and compared with the measured one. Induced body force in the melt was calculated with both of the calculated magnetic flux density and velocity profile. The dimensionless vortex formation height, where the vortex formation height is divided by orifice inner diameter, decreased from 1.7 down to 0.85 in both cases of the PM device and the EM device as the static magnetic field increased up to 0.17 T.

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  • Evaporation of Fe and Cr from Induction-stirred Austenitic Stainless Steel. Influence of the Inert Gas Pressure

    J. P. Bellot, H. Duval, M. Ritchie, A. Mitchell, D. Ablitzer

    pp. 696-705

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    DOI:10.2355/isijinternational.41.696

    Abstract

    In vacuum metallurgy, one of the purposes is the reduction (or at least the accurate prediction) of the evaporation losses. It is well known that the addition of an inert gas in a vacuum furnace increases the recondensation of the volatile elements and then reduces the evaporation losses. We may define the pressure P1/2 required to halve the evaporation rate. The objective of this study is a theoretical and experimental evaluation of P1/2 in the case of an austenitic stainless steel, and the analysis of the parameters which influence this value.
    The experimental programme was carried out on an austenitic stainless steel to determine the net flux of evaporation from a well-mixed liquid in an ambient pressure of argon ranging from 0.03 to 133 Pa. P1/2=30 Pa is estimated from the experimental curve.
    The mechanisms of volatilization have been modeled using both a system based and a mechanistic approach, and the calculation of the pressure P1/2 gives respectively 45 and 90 Pa. The numerical simulations (mechanistic approach) emphasize the strong expansion of the vapor from the high density regions close to the liquid surface. The macroscopic velocity of the vapor decreases as the argon pressure in the chamber increases since the average frequency of collision with the argon atoms increases.
    We have set up a sensitivity study in order to analyse the effects of the geometry and scale of the furnace and of the liquid temperature on the factor P1/2 . Since geometry and temperature vary in large scales for the industrial applications, the use of the experimental value P1/2=30 Pa obtained is discussed.

  • Effect of Oxygen on the Evaporation Rate of Lead from Liquid Copper under Reduced Pressure

    Takashi Yoshida, Tetsuya Nagasaka, Mitsutaka Hino

    pp. 706-715

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    DOI:10.2355/isijinternational.41.706

    Abstract

    Previously, the present authors have investigated the effects of temperature and pressure on the evaporation rates of Pb and Zn from liquid copper under reduced pressure. Oxygen does easily contaminate molten metal during high temperature processing and is known as a strong surface active element. In this study, the effect of oxygen on the evaporation rate of Pb from liquid copper was discussed at 1473 K and 1.3 kPa. The rate constant was supposed to be slower with oxygen content due to lowering the interfacial chemical reaction rate. However, the rate constant increased with oxygen content in the present experiment. Assuming that the acceleration of vaporization is due to the volatile lead oxide, the rate equation was derived for the evaporation of lead oxide together with that of metallic Pb. As a result of the analysis for the present experiment, it was found that Pb evaporated from copper melt containing higher oxygen in the form of PbO. The presence of PbO in the vapor phase was confirmed by the mass spectroscopy. The rate mechanism of vaporization of Sn and Cu from liquid steel containing oxygen have also been discussed.

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  • The Heating Characteristics of CaO–SiO2–FetO System Slags under Microwave Irradiation

    Kazuki Morita, Muxing Guo, Yoshito Miyazaki, Nobuo Sano

    pp. 716-721

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    DOI:10.2355/isijinternational.41.716

    Abstract

    In order to develop an efficient heating process for the waste slag treatment, the heating behavior of the synthetic CaO–SiO2–FetO slag under microwave irradiation was investigated. The heating rate of the slags was found to vary with the ratio of Fe3+/(Fe2++Fe3+) in the slags and the microwave energy was most efficiently absorbed when the value of Fe3+/(Fe2++Fe3+) was around 0.16 with the largest dielectric loss of the slag. Also the heating rate was benefited considerably from the presence of CaFe3O5 and magnetite phases in slags that have high value of dielectric loss. When the graphite powder was added to the slags, heating rate was drastically increased and the larger amount of carbon addition brought the higher value of heating rate.

  • Viscosity Measurements on Some Fayalite Slags

    N. N. Viswanathan, F.-Z. Ji, Du Sichen, S. Seetharaman

    pp. 722-727

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    DOI:10.2355/isijinternational.41.722

    Abstract

    In the present study, viscosity measurements on Fe–O–Si slags have been carried out using rotating cylinder method. The slag samples for viscosity measurement were prepared by pre-melting appropriate stoichiometric amounts of Fe, Fe2O3 and SiO2 in an iron crucible under argon atmosphere, which ensured that Fe ions in the slag were predominantly in the valence state of +2. The viscosities of the pre-melted slag samples were measured in iron as well as nickel crucibles under argon atmosphere at different temperatures. The measured viscosity values obtained in the two kinds of crucibles were found to be in good agreement, indicating thereby that nickel crucibles can be successfully used for viscosity measurements. In order to investigate the effect of oxidation of Fe2+ to Fe3+, the binary FenO–SiO2 slag was kept in a nickel crucible under oxidising conditions using a CO/CO2 atmosphere and viscosity measurements were carried out dynamically as a function of time at 1 623 and 1 673 K. With time, Fe3+ concentration in the slag increased and hence the viscosity changed progressively. The rate controlling step for the oxidation reaction was considered to be the mass transfer of CO2 in the gas stream to the slag–gas interface. A simple kinetic analysis was used to predict the concentration of Fe3+ in the slag with time. The measured viscosity with time indicated that the viscosity remains almost the same during initial period of oxidation. The viscosityraises sharply when the Fe3+ concentration in the slag, calculated as Fe2O3 reached around 7 mass%.

  • Precipitation Behavior of TiN in Fe–10mass%Ni Alloy during Solidification and Isothermal Holding at 1 400°C

    Georgy V. Pervushin, Hideaki Suito

    pp. 728-737

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    DOI:10.2355/isijinternational.41.728

    Abstract

    The precipitation of TiN during solidification and holding at 1400°C has been studied in an Fe–10mass%Ni alloy as a function of initial contents of Ti and N and holding time. Dendritic and nondendritic (globular cell) zones are observed under the condition of the undercooling of 5 to 35°C. The number of particles per unit area, NA, in nondendritic zone is significantly smaller than that in dendritic zone and the NA values in both zones increase with holding time. The values for mean particle diameter, dA, remain unchanged in dendritic zone with holding time, while the dA values decrease with holding time in nondendritic zone. In dendritic and nondendritic zones, the degree of precipitation of TiN particles increase with increasing area fraction of solid, fS, and the degree of precipitation depends on initial contents of Ti and N. The dA value in nondendritic zone, which is independent of fS, is larger than that in dendritic zone at zero holding time for a given initial content.

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  • Numerical Simulation of Microstructure Evolution of Al Alloys in Centrifugal Casting

    S. R. Chang, J. M. Kim, C. P. Hong

    pp. 738-747

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    DOI:10.2355/isijinternational.41.738

    Abstract

    A coupled stochastic model has been developed for the prediction of solidification grain structures in centrifugal casting. The present model consists of two schemes: the cellular automaton to simulate the evolution of solidification structure and the finite volume method to calculate the heat transfer. The present model has been applied to predict the evolution of solidification structures in centrifugal casting of Al alloys. The effects of mold rotation velocity, solute concentration, melt superheat and mold preheating temperature on solidification structures were investigated. In addition, the evolution of dendritic microstructures was also simulated using a modified cellular automaton model. The simulated results were in good agreement with those obtained experimentally.

  • Effect of Primary Deoxidation Products of Al2O3, ZrO2, Ce2O3 and MgO on TiN Precipitation in Fe–10mass%Ni Alloy

    Georgy V. Pervushin, Hideaki Suito

    pp. 748-756

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    DOI:10.2355/isijinternational.41.748

    Abstract

    Effect of Al2O3, ZrO2, Ce2O3 and MgO particles with mean diameter of 0.8 to 1.5 μm on the precipitation of TiN during solidification and holding at 1 400°C has been studied in an Fe–10mass%Ni alloy. The values for the number of particles per unit area, NA, and the mean diameter, dA, of TiN and TiN+MxOy(M=Al, Zr, Ce, and Mg) particles have been measured as a function of initial contents of Ti (50 to 990 mass ppm) and N (200 to 290 mass ppm), and holding time (0 and 60 min). The NA values of the TiN+MgO particles are considerably higher than those of the TiN+MxOy(M=Al, Zr, and Ce) particles, while the dA values of the former particles, which are found to be independent of solidification mode, are smaller than those of the latter particles. The dA values of TiN and TiN+MxOy(M=Al, Zr, and Ce) particles in dendritic solidification are smaller than those in nondendritic one, whereas an opposite trend is observed with respect to the NA values. The dA values of the TiN and TiN+MxOy particles were found to remain unchanged, but the NA values tended to slightly increase with holding time.

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  • Quantitative Analysis of Total and Insoluble Elements and Inclusion Composition in Metal by Laser Ablation ICP-MS Method

    Andrey V. Karasev, Ryo Inoue, Hideaki Suito

    pp. 757-765

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    DOI:10.2355/isijinternational.41.757

    Abstract

    Total (Mtotal) and insoluble (Minsol) contents of element, and inclusion composition in metal samples have been analyzed quantitatively by using the laser ablation ICP-MS (LA-ICP-MS). The contents of Mtotal and Minsol in Fe–M, Fe–10mass%Ni–M, and Fe–0.2mass%C–M(M=Ti, Al, and Ce) alloys obtained by LA-ICP-MS are compared with those from chemical analysis. The compositions of synthetic particles (CA2, CA, C12A7, C3A, CAM, and MA; C=CaO, A=Al2O3, and M=MgO) and complex inclusions (Al2O3–TiN and Ce2O3–TiN) on a surface of glass or metal sample are analyzed by LA-ICP-MS, and these values are compared with those from EPMA and chemical analysis. It is found that LA-ICP-MS is an useful technique to the quantitative analysis of total and insoluble contents of elements and composition of inclusions in the range of particle diameter from 1 to 100μm.

  • Mathematical Modeling of the Recrystallization Kineticsof Nb Microalloyed Steels

    Sang-Hyun Cho, Ki-Bong Kang, John J. Jonas

    pp. 766-773

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    DOI:10.2355/isijinternational.41.766

    Abstract

    The recrystallization behavior of Nb microalloyed steels was studied using hot torsion testing with the aim of modeling the recrystallization processes taking place during hot rolling. Continuous and interrupted torsion tests were performed in the temperature range 850 to 1050°C at strain rates of 0.05 to 5/s on selected low carbon steels containing Cr, Mo, Nb, Ni and Ti. The kinetics of static and metadynamic recrystallization were characterized and appropriate expressions were formulated for the recrystallization kinetics. These are shown to depend on steel composition and the processing conditions. The rate of metadynamic recrystallization increases with strain rate and temperature and is observed to be independent of strain, in contrast to the observations for static recrystallization. By means of extrapolations to mill strain rates, it is shown that metadynamic recrystallization will always be more rapid than static recrystallization, even at the largest possible accumulated strains. These calculations support the view that the unexpected load drops occasionally observed in industrial mills (particularly in the final few passes) are probably due to strain accumulation leading to the initiation of dynamic recrystallization, followed by metadynamic recrystallization.

  • Improved Model for Static Recrystallization Kinetics of Hot Deformed Austenite in Low Alloy and Nb/V Microalloyed Steels

    S. F. Medina, A. Quispe

    pp. 774-781

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    DOI:10.2355/isijinternational.41.774

    Abstract

    Using torsion tests a improved model has been constructed to predict the static recrystallization kinetics of deformed austenite in low alloy and microalloyed steels. The model quantifies the influence of the most common elements (C, Si, Mn, Mo) in low alloy steels and the typical elements (V, Nb) in microalloyed steels, when they are in solution. Activation energy (Q) is the parameter sensitive to the content and nature of each alloying element, and an expression for Q is shown as a function of the percentage of each one. Nb is the element that contributes most to increasing the value of Q, and thus that which most delays recrystallization kinetics. C is seen to be the only alloying element that contributes to lowering the value of Q, and thus to accelerating recrystallization kinetics. Extrapolation of the expression of Q to pure iron in the austenitic phase gives a value of 148 637 J mol-1, which is similar to other values found in the literature for the grain boundary self-diffusion energy of pure Feγ . Static recrystallization kinetics follow Avrami's law and expressions are given for the parameter t0.5 and the exponent n.

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  • FEM Modeling of Flow Curves for Ferrite/Pearlite Two-Phase Steels

    Dong-Woo Suh, Jin-Ho Bae, Jae-Young Cho, Kyu Hwan Oh, Hu-Chul Lee

    pp. 782-787

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    DOI:10.2355/isijinternational.41.782

    Abstract

    Flow curves of ferrite/pearlite two-phase steels were simulated using finite element method (FEM) with regression equations for flow curves of each ferrite and pearlite phase proposed by Hiramatsu et al. and Furukawa et al. The calculated flow strength of ferrite/pearlite two-phase steel was lower than the experimentally measured one mainly due to the underestimation of flow strength of ferrite phase according to the yield elongation. To improve the simulation, the flow curves in homogeneous deformation range were considered. Microscopic observations revealed that most deformation was accumulated in the ferrite phase during yield elongation. Flow curves of ferrite phase were re-evaluated based on this observation and flow curves of ferrite/pearlite steels were also re-calculated. Re-calculated yield strength of ferrite/pearlite steels showed good agreement with measured ones, however the work hardening rate of re-calculated flow curves is still lower than that of measured one. The simplicity of pearlite morphology for FEM analysis is thought to be responsible for lower work hardening behavior of calculated flow curve by FEM than that of measured one.

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  • Study on the Propagating Shear Fracture in High Strength Line Pipes by Partial-gas Burst Test

    Hiroyuki Makino, Izumi Takeuchi, Masatoshi Tsukamoto, Yoshiaki Kawaguchi

    pp. 788-794

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    DOI:10.2355/isijinternational.41.788

    Abstract

    In this paper, for the purpose of investigation on quantitative correlation between the partial-gas burst tests and the full-scale burst tests as a first step of establishing the evaluating method of crack arrestability in pipelines from partial-gas burst test results, the effects of the differences in test conditions on crack propagation behavior between both tests were evaluated. The partial-gas burst tests using high strength X80 pipes were carried out six times with varied gas ratio and failure pressure. The test results indicated that the crack propagation is much influenced by not only the failure pressure but also the gas ratio. After evaluation of the differences between the partialgas burst tests and the full-scale burst tests, the simulating method of the propagating shear fracture in partial-gas burst tests were proposed. The crack propagation of the partial-gas burst tests was well simulated by this method and good agreement between the experimental data and the simulated results was obtained.

  • Prediction of Stress–Strain Behaviors in Steels Using an Integrated Constitutive, FEM and ANN Model

    L. X. Kong, B. Wang, P. D. Hodgson

    pp. 795-800

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    DOI:10.2355/isijinternational.41.795

    Abstract

    Austenitic steels with a carbon content of 0.0037 to 0.79 wt% C are torsion tested and modeled using a physically based constitutive model and an Integrated Phenomenological and Artificial neural Network (IPANN) model. The prediction of both the constitutive and IPANN models on steel 0.017 wt% C is then evaluated using a finite element (FEM) code ABAQUS with different reduction in the thickness after rolling through one roll stand. It is found that during the rolling process, the prediction accuracy of the reaction force from FEM simulation for both constitutive and IPANN models depends on the strain achieved (average reduction in thickness). By integrating FEM into IPANN model and introducing the product of strain and stress as an input of the ANN model, the accuracy of this integrated FEM and IPANN model is higher than either the constitutive or IPANN model.

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  • Recovery of the Metals from Pickling Liquors of Stainless Steel by Precipitation Methods

    Javier Dufour, Carlos Negro, Francisco Heras, Federico López-Mateos

    pp. 801-806

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    DOI:10.2355/isijinternational.41.801

    Abstract

    Pickling liquors are still one of the main environmental concerns of the stainless steel industry. Most of the processes designed to recover these wastes focus on the recovery of their acid content (mixtures of HF and HNO3), but also produce metals (iron, nickel, chromium and molybdenum) as a low quality by-product that sometimes must be treated as a residue. This paper presents the development of a process to obtain commercial products from the metal content of these liquors. To this end, three precipitation methods (total, sequential and modified) were tested. The proposed procedure is the last one, i.e., modified precipitation. It consists of two stages each resulting in the recovery of solids. The first product is mainly composed of iron and chromium hydroxides and oxides, along with molybdate, while the second is mainly composed of nickel hydroxide. In addition, this method allows an almost total recovery of the acids.

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  • © 2001 The Iron and Steel Institute of Japan

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