Steel Science Portal

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

Grid List Abstracts

ONLINE ISSN: 1883-2954
PRINT ISSN: 0021-1575

Tetsu-to-Hagané Vol. 96 (2010), No. 11

  • Solidified Structure of S45C Steel With and Without the Imposition of Electromagnetic Field

    Kazuhiko Iwai, Takenori Kohama

    pp. 637-640

    Bookmark

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

    Log in / Sign Up

    DOI:10.2355/tetsutohagane.96.637

    Abstract

    S45C carbon steel has been solidified under the simultaneous imposition of a static magnetic field in vertical direction and an alternating current having a horizontal component. Thus, an electromagnetic force was excited in the S45C steel sample and it affected structure formation during the solidification. The samples solidified under different electromagnetic conditions were cut and chemically etched for observation of the macro- and micro-structures. Solidified structure in the case neither the static magnetic field nor the alternating current was not imposed was dendritic structure. On the other hand, solidified structure under the simultaneous imposition of the 1 T static magnetic field and the alternating current of 80 A, 2 kHz was equi-axed structure. When the magnetic field intensity was decreased from 1 to 0.3 T, equi-axed structure and dendritic structure co-existed. As the frequency of the 80 A alternating current decreased from 2 kHz to 100 Hz under the constant magnetic field intensity of 1 T, solidified structure changed from equi-axed structure to dendritic one. Mechanism of the structure change is supposed to be breaking dendrites into pieces by convection induced in the sample by the non-uniform distribution of the electromagnetic force, which was intensified as the frequency of the alternating current increased.

    Recommended Articles: Effect of its Charging Condition and Sintering Gas Velocity on Metallic Iron Productivity of Partially Reduced Agglomerates Production in Packed Bed with Air Flow [ View more ]

    x

    Readers Who Read This Article Also Read

    1. Effect of its Charging Condition and Sintering Gas Velocity on Metallic Iron Productivity of Partially Reduced Agglomerates Production in Packed Bed with Air Flow Tetsu-to-Hagané Vol.96(2010), No.11

  • Oxidation Removal of Sn from Carbon Saturated Iron via Ag Phase

    Hideki Ono, Yoshikazu Tanaka, Katsuhiro Yamaguchi, Tateo Usui

    pp. 641-645

    Bookmark

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

    Log in / Sign Up

    DOI:10.2355/tetsutohagane.96.641

    Abstract

    The oxidation removal of Sn from carbon saturated iron via Ag phase was tried at 1523K. In addition, the thermodynamic data, which are necessary to know the lowering limit of Sn content in carbon saturated iron by this method, were measured.
    The distribution ratio between carbon saturated iron and Ag, LSn(mass)(=[mass%Sn](in Ag)/[mass%Sn](in Fe–C)) and the activity coefficient of Sn in carbon saturated iron, γ°Sn(in Fe–C), are determined to be 44 and 12.2 at 1523K, respectively. By using these values, the lowering limit of Sn content in carbon saturated iron is calculated to be 1.3×10−8 mass% in oxygen atmosphere (1 atm) at 1523K under the condition that the activity of SnO2 equals to unity. As the experimental results of Sn oxidation removal from carbon saturated iron via Ag phase, the Sn content of carbon saturated iron is actually reduced to less than 0.001 mass% (estimated to be about 0.0001 mass%) from 3 mass%, and it is found that the Sn in molten iron can be removed by the method proposed in the present study.

  • Effect of its Charging Condition and Sintering Gas Velocity on Metallic Iron Productivity of Partially Reduced Agglomerates Production in Packed Bed with Air Flow

    Chikashi Kamijo, Takazo Kawaguchi

    pp. 646-653

    Bookmark

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

    Log in / Sign Up

    DOI:10.2355/tetsutohagane.96.646

    Abstract

    In order to improve the metallic iron (M.Fe) productivity of partially reduced agglomerates production in packed bed with air flow, the packed bed of which the carbon composite iron ore green balls were charged lower side and the ordinary raw materials are charged on them, called lower charging, were examined. The M.Fe productivity of lower charging were compared with that of the packed bed in which the carbon composite iron ore green balls were mixed with the ordinary raw materials and charged, called mixed charging. Also, the effect of exhaust gas velocity during sintering was studied. As a result, the M.Fe productivity of lower charging was higher than that of mixed charging because reduced agglomerates placed upper side of the packed bed were easier to be re-oxidized. In addition, when the exhaust gas velocity was too slow, the time for re-oxidization was extended so that the M.Fe productivity decreased. However, when the exhaust gas velocity was too fast, the excess of free C combustion or re-oxidization of reduced agglomerates was caused so that the M.Fe productivity decreased, too. Therefore, there is a exhaust gas velocity which make the M.Fe productivity be highest. In this study, the M.Fe productivity achieved 0.21 M.Fe-t/m2/h with lower charging and 0.19 Nm/s of exhaust gas velocity.

    Recommended Articles: Numerical Analysis of Effect of Defects on Fracture Behavior in Metallurgical Coke Using Rigid Bodies–Spring Model [ View more ]

    x

    Readers Who Read This Article Also Read

    1. Numerical Analysis of Effect of Defects on Fracture Behavior in Metallurgical Coke Using Rigid Bodies–Spring Model Tetsu-to-Hagané Vol.95(2009), No.8
    2. Enhancement of Caking Property of Slightly Caking Coal by Addition of Hydrogen Donor Tetsu-to-Hagané Vol.96(2010), No.5
    3. Self Reaction Behavior of Wood Flour Added Coal Composite Iron Ore Hot Briquettes under a Blast Furnace Simulated Heat and Load Tetsu-to-Hagané Vol.95(2009), No.8

  • Selective Backscattered Electron Imaging of Material and Channeling Contrasts in Microstructures of Scale on Low Carbon Steel Controlled by Accelerating Voltage and Take-off Angle

    Tomohiro Aoyama, Masayasu Nagoshi, Hideki Nagano, Kaoru Sato, Shigeaki Tachibana

    pp. 654-658

    Bookmark

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

    Log in / Sign Up

    DOI:10.2355/tetsutohagane.96.654

    Abstract

    The behaviors of contrasts in backscattered electron (BSE) images of cross-sectional heat-treated steel are studied under various accelerating voltages and take-off angle conditions. Changes in these conditions resulted in dramatic changes in contrasts. Low accelerating voltages and low take-off angles improve surface information and channeling contrasts, whereas high accelerating voltages and high take-off angles enhance bulk information and reduce channeling contrasts, resulting in improved Z contrast. These behaviors can be understood by the ratio of LLE (Low-Loss Electron), which are related to channeling contrasts, to the inelastic BSE components detected. The distribution of these components varies depending on the accelerating voltage and take-off angle, in that the detection ratio of LLE to inelastic BSE increases with decreasing accelerating voltages and take-off angles. The results obtained in this study can be used for obtaining Z and crystallographic information separately in BSE images for the material of interest.

  • Effects of Carbon and Nitrogen Contents on Recrystallization Behavior in Ti added High Purity 11Cr Stainless Steels

    Kazuhisa Matsumoto, Masao Kikuchi, Yoshiharu Inoue

    pp. 659-664

    Bookmark

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

    Log in / Sign Up

    DOI:10.2355/tetsutohagane.96.659

    Abstract

    The effects of (C+N) contents on the recrystallization behaviors of Ti added high purity ferritic stainless steels were investigated. Recrystallization and grain growth of Ti added ferritic stainless steels retarded as Ti and (C+N) contents increased. It is considered that the retardation of recrystallization and grain growth in Ti added steels became more significant through the increase in the Ti and C contents accompanied by the increase in the amount of Ti(C, N), which pinned dislocations and grain boundaries.

  • Effect of Chromium, Aluminum and Nickel on Microstructure and Reverse-S type Creep Rupture Strength of High Cr Ferritic Heat Resisting Steels

    Kentaro Asakura, Toshihiko Koseki, Takashi Sato, Masahiko Arai, Toshiaki Horiuchi, Koji Tamura, Toshio Fujita

    pp. 665-672

    Bookmark

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

    Log in / Sign Up

    DOI:10.2355/tetsutohagane.96.665

    Abstract

    Microstructure and creep strength at 650°C of two high-Cr ferritic heat resisting steels were investigated. 11Cr steel containing relatively high carbon, aluminum and nickel showed a significant drop in creep strength after 1000 h while 9Cr steel containing relatively low carbon, aluminum and nickel showed a recovery of creep strength after a slight drop. The 11Cr steel contained M23(CB)6, Z phase and relatively coarsened Laves phase as precipitates after 7000 h at 650°C, while the 9Cr steel contained fine MX and ultrafine M6C in addition to M23(CB)6 and Laves phase. Z phase was not found and the growth of Laves phase was retarded in the 9Cr steel. It was concluded that the drop of creep strength in the 11Cr steel was attributed to the coarsened Laves and Z phases and the recovery of the strength in the 9Cr steel to fine MX and M6C. Experimental results on the effects of steel compositions on the stability of precipitates in the steels were thermodynamically consistent with Thermo-Calc calculation results using an existing database. It was suggested that chromium and aluminum increased the kinetics of the formation and coarsening of the precipitates.

    Recommended Articles: Embrittlement Factors in High-Cr Ferritic Heat Resisting Steels [ View more ]

    x

    Readers Who Read This Article Also Read

    1. Embrittlement Factors in High-Cr Ferritic Heat Resisting Steels Tetsu-to-Hagané Vol.75(1989), No.7
    2. Effect of Chromium Content on Creep Rupture Properties of a High Chromium Ferritic Heat Resisting Steel ISIJ International Vol.29(1989), No.8
    3. A Probabilistic Approach to Model Interfacial Phenomena during Hot Flat Rolling of Steels ISIJ International Vol.46(2006), No.4
  • © 2010 The Iron and Steel Institute of Japan

Article Access Ranking

02 Jul. (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. Production and Technology of Iron and Steel in Japan during 2019 ISIJ International Vol.60(2020), No.6
  3. Improvement in Reduction Behavior of Sintered Ores in a Blast Furnace through Injection of Reformed Coke Oven Gas ISIJ International Advance Publication
  4. Scheduling in Continuous Steelmaking Casting: A Systematic Review ISIJ International Vol.60(2020), No.6
  5. Preface to the Special Issue on “Behaviour of Light Elements in Steels and Its Effects on Microstructure and Properties” Tetsu-to-Hagané Vol.106(2020), No.6
  6. Numerical Simulation of Fluid Flow and Solidification in a Vertical Round Bloom Caster Using a Four-port SEN with Mold and Strand Electromagnetic Stirring ISIJ International Advance Publication
  7. Influence of H2–H2O Content on the Reduction of Acid Iron Ore Pellets in a CO–CO2–N2 Reducing Atmosphere ISIJ International Advance Publication
  8. Sinter Pot for Temperature Measurement of the Top Layer during and After the Ignition ISIJ International Advance Publication
  9. From Iron Ore to Crude Steel: Mass Flows Associated with Lump, Pellet, Sinter and Scrap Iron Inputs ISIJ International Vol.60(2020), No.6
  10. Taguchi Orthogonal Test on Granule Properties and Porosity Distribution in Sintering Bed using High-resolution X-ray Computed Tomography ISIJ International Vol.60(2020), No.6

Search Phrase Ranking

02 Jul. (Last 30 Days)

  1. blast furnace
  2. blast furnace productivity
  3. blast furnace permeability
  4. electric arc furnace
  5. bearing steel
  6. cao sio2 viscosity
  7. 17-7 ph
  8. inclusions
  9. nox iron ore sinter
  10. big data