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. 54 (1968), No. 1

  • 随想

    pp. 1-2

    Bookmark

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

    Log in / Sign Up
  • 1967 Perspective of Production and Technique of Iron and Steel in Japan

    pp. 3-13

    Bookmark

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

    Log in / Sign Up
  • Study on the Properties of Calcium Ferrites in the Ca O-Fe0-Fe2O3 Ternary System

    pp. 14-19

    Bookmark

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

    Log in / Sign Up
    The present paper describes microstructure, X-ray diffraction, microhardness and reduction test of calcium ferrites existed in the Ca O-Fe O-Fe2O3 ternary system.
    The results obtained are as follows-
    1. In the identification of calcium ferrites, four calcium ferrites can be identified by the use of the polarization by reflection microscopy and the use of some etchants.
    2. On the results of X-ray diffraction, interplanar spacings are computed by use of Bragg's equation.
    3. From the results of the measurement of the microhardness for each specimen, it may be used for supplemental method of the identification by microscopy.
    4. In the reduction test, it was recognized that the reducibility of calcium ferrites was good comparable with binary calcium ferrites reported formerly.
  • Studies on the Rate of Absorption of Nitrogen in Liquid Iron Containing Surface Active Elements

    pp. 19-34

    Bookmark

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

    Log in / Sign Up
    The rates of absorption of nitrogen in liquid iron containing surface active elements, such as oxygen.and sulphur, were measured at 1550°C and 1600°C.
    The transfer of nitrogen across the gas-metal interface was remarkably disturbed by those surface.active elements, adsorbed on the surface of the metal. It was also recognized that the rates of absorption in those melts were proportional to the partial pressure of nitrogen, when the metal contained more than nearly 0.03% sulphur or oxygen. Furthermore, it was observed that the rates of absorption were inversely proportional to 2/3 power of sulphur(or oxygen) concentration in the bulk Contains higher than 0.03%S (or 0.02%O). These concentrations correspond to the coverage of the surface by sulphur or oxygen nearly as Fe S or Fe, calculated by the Gibbs' adsorption equation. It becomes
    (dc/dt)t=0=K·PN2/(wt%S or wt%O)2/3
    Consequently, it seems reasonable to regard that in those melts the transfer of nitrogen from gas into liquid iron may be chemically controlled, namely it is mainly controlled by the rate of nitrogen adsorption. It is now accepted that oxygen or sulphur behaves as a poison on the metal surface. Behaviour of surface active elements at gas-metal interface could be explained, assuming that they were concentrated to the interface as ions, S2- or 02-. The rate of reaction was also discussed from the stand--point of the absolute rates theory
    There is a linear relation between apparent mass transfer coefficient of nitrogen and surface tension of liquid iron containing surface active elements, practically no different between sulphur and oxygen.
    The activation energy for absorption of nitrogen should decrease as the surface coverage adsorbed by oxygen decreases, and is approximately 20kcal/mol at about 0.001% oxygen. This value corresponds nearly to the order of the activation energy for diffusion of oxygen in liquid iron.
  • Mössbauer Effect Study of the Iron-Carbon Martensite and Its Tempering Process

    pp. 34-48

    Bookmark

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

    Log in / Sign Up
    We have measured the Mossbauer effect of 57Fe in iron-carbon martensite and its change after ternpering. The resonant absorption spectrum in martensite was resolved into several components arising from iron atoms, which are the 1st, 2nd, 3, 4th neighbors to the carbon atoms and remnant iron atoms. A carbon atom causes localized changes of electronic states of the surrounding iron atoms, especially affecting the 1st nearest neighboring iron atoms.
    The internal magnetic field at nuclei of the 1st neighbors is 265 KOe, which is far less than 330 KOe of pure iron. Variation of the isomer shift and appearance of a large positive quadrupole effect were also observed. It is suggested from the MOssbauer measurement that the bonding between the carbon atoms and the 1st neighboring iron atoms in martensite may be accompanied, possibly, by the covalent admixture of wave functions.
    Internal magnetic fields and isomer shifts of the 2nd and 3, 4th neighbors also deviate slightly from those of pure iron, but the sign of the deviation is opposite to those of the 1st neighbors. Their quadrupole effects were nearly zero, which means that the positive charge of the carbon ion is almost screened out within a distance of the order of 2Å by the additional electron clouds.
    The localized nature of the effect of the carbon atom permits a parallel discussion between the ironcarbon martensite and the α-solid solution.
    From the changes of the Mössbauer spectrum after tempering of martensite, we have concluded that the bonding between the carbon atoms and the iron atoms in the coherent ε-carbide formed at the stage I is essentially the same as the bonding in the martensite or the a-solid solution.
    We have also evidence that the χ-carbide is formed at the stage III a of tempering, the formation of which has not been fully proved in the previous x-ray or magnetic measurements. The mean internal magnetic fields after the heat treatments change from 194 KOe due to mainly χ-carbide (at 220°C) to 208 KOe due to cementite (at 520°C).
    The reduction of the internal field of the 1st neighboring iron atom in various Fe-C systems, irrespective of their crystal structure such as the solid solution, the ε-phase, the χ-phase, the θ-phase (cementite), is roughly proportional to the number of their nearest neighboring carbon atoms. Decreases in the internal field of an iron atom per carbon atom are about 60 KOe. These localized and additive behaviors suggest that the bonding nature between the carbon atoms and the neighboring iron atoms in the above structures can be understood on a common ground.
  • The Effect of Alloying Addition and Heat Treatment on High Temperature Strength and Structure of 18Cr-12Ni-3Mo Austenitic Heat Resisting Steel Containing Boron

    pp. 48-68

    Bookmark

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

    Log in / Sign Up
    The effect of alloying element such as C, B, Ti and Nb, and heat treatment on the high temperature strength and micro structure of 18Cr-12Ni-3Mo austenitic heat resisting steels containing boron were investigated.
    In B addition, creep rupture strength increased with increasing B content, whereas in C addition, tit reached maximum at 0.2%C. These effects were ascribed mainly to a precipitation hardening duevto M23C6 occurring during creep. The effects of Ti and Nb additions on creep rupture strength were given as a function of (Ti+Nb)/C (atomic percent ratis) irrespective of C contents, and gave a maximum effect at (Ti+Nb)/C=0.4-0.8. Therefore, these effects of Ti and Nb additions were ascribed partly to a change in morphology and growth rate of M23C6, into which Ti and Nb were dissolved.
    Moreover, creep rupture strength increased with increasing solution temperature, up to 1250°C. Surprisingly, the eutectic structures had no negative effect upon creep rupture strength of the steels.
    Also, the complex borides in these alloys were identified by X ray and chemical analyses. The relation between the sort of borides and eutectic temperature was also discussed.
  • A View on the Method for Analysis of Gas Components in Iron and Steel

    pp. 69-86

    Bookmark

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

    Log in / Sign Up
  • Report of Comparative High Temperature Tensile Testing of Steel

    pp. 87-103

    Bookmark

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

    Log in / Sign Up
  • Rapid Heating and Impact Loading of Steels

    pp. 104-132

    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. 133-138

    Bookmark

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

    Log in / Sign Up

Article Access Ranking

22 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 2018 ISIJ International Vol.59(2019), No.6
  3. Preface to the Special Issue “Fundamentals and Application Technologies for High-performance Hot-dip Galvanized Coatings” Tetsu-to-Hagané Vol.105(2019), No.7
  4. Insights into Accumulation Behavior of Harmful Elements in Cohesive Zone with Reference to Its Influence on Coke ISIJ International Advance Publication
  5. Influence of Annealing Temperature and Dew Point on Kinetics of Mn External Oxidation Tetsu-to-Hagané Vol.105(2019), No.7
  6. Microstructure and Phase of Carbon Brick and Protective Layer of a 2800 m3 Industrial Blast Furnace Hearth ISIJ International Advance Publication
  7. Recycling of Blast Furnace Sludge to the Blast Furnace via Cold-Bonded Briquettes: Evaluation of Feasibility and Influence on Operation ISIJ International Advance Publication
  8. Properties-to-microstructure-to-processing Inverse Analysis for Steels via Machine Learning ISIJ International Advance Publication
  9. Quantitative Analyses of Chemical Structural Change and Gas Generation Profile of Coal upon Heating toward Gaining New Insights for Coal Pyrolysis Chemistry ISIJ International Advance Publication
  10. Understanding the Structure and Structural Effects on the Properties of Blast Furnace Slag (BFS) ISIJ International Vol.59(2019), No.7

Search Phrase Ranking

22 Jul. (Last 30 Days)

  1. blast furnace
  2. blast furnace productivity
  3. 龍角散
  4. blast furnace permeability
  5. chinese academy of science
  6. continuous casting
  7. corrosion
  8. ladle furnace
  9. balling index
  10. cao-sio2-feo