Tetsu-to-Hagané
New Arrival Alert : OFF

You can use this feature after you logged into the site.
Please click the button below.

Log in / Sign up
ONLINE ISSN: 1883-2954
PRINT ISSN: 0021-1575

Tetsu-to-Hagané Vol. 55 (1969), No. 8

  • Study on the Mineralogical and Metallurgical Properties of Synthetic Calcium Ferrite

    pp. 669-681

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up
    The large perfect crystals of typical calcium ferrites were successfully synthesized by “solid-liquid reaction method” from mixtures correspond to CaO·Fe203, 2CaO·Fe203, Ca0·2Fe203, 4CaO·Fe0·4Fe2O3, 3CaO·Fe0·7Fe203 and 4CaO·Fe0·8Fe203, respectively. The mineralogical properties of synthesized calcium ferrites, i. e., optical characteristics, reflectivity, etching effect, microhardness and Xray diffraction pattern, were examined.
    Besides Ca0·2Fe203 compound, a ternary calcium ferrite compound proved to exist, whose chemical composition is approximately similar to Ca0·2Fe203 and is estimated to be one of the followings 3CaO·Fe0·7Fe203, 4CaO·Fe0·9Fe203, or 4Ca0·2Fe0·9Fe203. X-ray diffraction patterns of CaO·Fe203, 2CaO·Fe203 and 4CaO·Fe0·4Fe203 were in agreement with the data of previous workers.
    For determining metallurgical properties of binary calcium ferrites, about 2kg samples are synthesized by solid state reaction. The conventional testing methods for iron ores were applied, i. e., the JIS methods for testing reducibility, the rotation strength after reducibility test, the degradation strength after reduction at lower temperatures, and the temperature of shrinkage, softening and melting. The degradation strength after low temperature reduction of binary calcium ferrites is much higher than that of actual self-fluxed sinter.
  • Improved Calculus of Cooling Condition and Withdrawal Rate for Continuous Casting

    pp. 682-688

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up
    In the analysis of the solidification process of continuous casting operation, the estimation of modifiedFourier number, H2L/uW2, which determines the quantitative relations between the length of thecooling zone and thermal diffusivity, thickness and withdrawal rate of the ingot, has been facilitatedby the adoption of the integral-profile method.
    The calculus for continuous casting presented in previous paper by considering the completion offreezing of metals at the end point of the spray cooling zone has been improved and developed tothe new calculus, in which the complete solidification at the position of pinch rolls was taken intoaccount and another dimensionless factor, H3Lp/uW2 was introduced.
    The values of H2, m in and H3, min derived theoretically in this work may be used as the standard onesin decision of the length of cooling zone and the operating conditions.
    The values of residence time in cooling zone calculated for three kinds of steels under various coolingconditions have been in good agreement with the estimated values which were presented in other papers, hitherto.
  • On the Dissolution of Silicon into Solid Iron

    pp. 689-694

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up
    The dissolution of silicon into the solid iron was studied at PH2=1 atm, 1150-1300°C by the aid of silicon monoxide gas.
    The results obtained are as follows:
    1) Unlike siliconization with silicon halide atmospheres, the weight of specimen after the present siliconizing treatment increased and the siliconized layer obtained was free from holes.
    2) In this siliconizing method, the rate of dissolution of silicon was mainly controlled by the transportation of SiO (g) in gas diffusion layer.
    3) An apparent activation energy obtained from the temperature dependence of the mass transfer coefficient, kG was 16kcal/mol.
  • Serrated Flow and Luders Bands Observed in Fe-Ni-C Martensite during Tensile Test

    pp. 695-705

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up
    The serrated flow, the Lüders bands and flow stress observed in Fe-23%Ni-0.24%C martensite during tensile test were studied at various temperatures between-196 and 220°C. The results obtained were as follows:
    (1) Temperature dependence of flow stress of the Fe-Ni-C martensite was explained in terms of the rearrangement of carbon atoms due to Snoek type or Cottrell type pinning, or of the clustering of carbon atoms or the precipitation of fine carbide particles on dislocations. The strain hardening at the early stage of deformation was remarkable in the martensite.
    (2) Serrated flow was found at a certain range of the test temperature. The temperature range varied with the strain rate. For example, the serration appeared between 1 and 170°C for the strain rate of 5.6×10-4/sec. At this temperature range, the increment in 0.2%-flow-stress was observed, but the strain hardening during serrated region was not so much.
    (3) The distinct Luders bands were observed during serrated flow. One Lüders band corresponded to one stress drop of the serration. The characteristic of Lüders bands in the martensite differed from that of annealed mild steel. The finer Liiders bands were uniformly distributed in the martensite, the larger total elongation was observed.
    (4) From the analysis of the critical condition for the serration, it was found that (a) a certain degree of plastic strain was necessary for the serrated flow to occur and (b) each step of yielding during serrated flow was an independent process of dynamic strain aging and was associated with the occurrence of one Lüders band.
  • Some Problems of the Analysis of Ferroalloy

    pp. 706-717

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up
  • A Hope on Physicochemical Engineering of Metallurgy

    pp. 718-725

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up
  • Prospects of Heavier Tendency on Forgings and Castings

    pp. 726-729

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up
  • Report of D. K. Chernov Centennial Symposium

    pp. 730-746

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up
  • 寄書

    pp. 747-747

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up
    x

    Readers Who Read This Article Also Read

    1. 表面処理・その他 Tetsu-to-Hagané Vol.52(1966), No.11
    2. Kinetic Study of the Decarburization of Liquid Iron Tetsu-to-Hagané Vol.52(1966), No.12
    3. II 連続鋳造の凝固について Tetsu-to-Hagané Vol.56(1970), No.4
  • 抄録

    pp. 748-755

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

Article Access Ranking

24 Jan. (Last 30 Days)

  1. Perspective toward Long-term Global Goal for Carbon Dioxide Mitigation in Steel Industry Tetsu-to-Hagané Vol.105(2019), No.6
  2. Development of In-situ Orientation Mapping and Microstructure Observation System for Ferrite/Austenite and Martensitic Transformations in Steel ISIJ International Advance Publication
  3. Development and Application of Thermo-mechanical Control Process Involving Ultra-fast Cooling Technology in China ISIJ International Vol.59(2019), No.12
  4. Time-resolved and In-situ Observation of δγ Transformation during Unidirectional Solidification in Fe–C Alloys ISIJ International Advance Publication
  5. Crystallisation of Silicate Glasses and Melts with Chemical Compositions in Primary Phase Region of Gehlenite ISIJ International Vol.60(2020), No.1
  6. A Review on Prevention of Sticking during Fluidized Bed Reduction of Fine Iron Ore ISIJ International Vol.60(2020), No.1
  7. Feasibility Investigation for Online Elemental Monitoring of Iron and Steel Manufacturing Processes using Laser-Induced Breakdown Spectroscopy ISIJ International Advance Publication
  8. Morphology and Composition of Inclusions in Si–Mn Deoxidized Steel at the Solid-Liquid Equilibrium Temperature ISIJ International Vol.60(2020), No.1
  9. Modeling of Surface Crack Defects Developed on Shear Edge in High-strength Automotive Steel Sheets ISIJ International Vol.60(2020), No.1
  10. Development of High Accuracy Segmentation Model for Microstructure of Steel by Deep Learning ISIJ International Advance Publication

Search Phrase Ranking

24 Jan. (Last 30 Days)

  1. blast furnace
  2. blast furnace productivity
  3. blast furnace permeability
  4. アーク溶接におけるセンシングと制御
  5. desulfurization slag
  6. effect of rare earth metal on inclusion composition in molten stainless steel
  7. forescatter imaging ebsd detector
  8. gma溶接 制御
  9. high strain rate
  10. kr slag