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Tetsu-to-Hagané
Vol. 53 (1967), No. 12

Tetsu-to-Hagané Vol. 53 (1967), No. 12

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ONLINE ISSN:	1883-2954
PRINT ISSN:	0021-1575
Publisher:	The Iron and Steel Institute of Japan

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Tetsu-to-Hagané Vol. 53 (1967), No. 12

随想

吉田浩

pp. 1379-1380

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随想

Bibtex

Ris

Thermodynamics of Liquid Iron Solutions

Dr. L. S. DARKEN

pp. 1381-1392

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Thermodynamics of Liquid Iron Solutions

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On the Rate of Absorption of Nitrogen in Liquid Iron and Iron Alloys, Containing Carbon, Silicon, Manganese and Chromium

Takao CHOH, Michio INOUYE

pp. 1393-1406

Abstract

The rates of absorption of nitrogen in liquid iron and liquid iron alloys were measured for inductively melted iron under pure nitrogen at 1600°C.
The experimental data show a linear correlation, which gives the apparent mass transfer coefficient, k′, when the variable, log [(Cs-Co)/(Cs-C)] is plotted vs F·t/V.
The experimental values of the apparent mass transfer coefficient obtained for lower oxygen melts are as follows:
k′=34-35×10^-3 cm·sec^-1 for 0.005-0.006% O
k′=27-29×10^-3cm·sec^-1 for 0.008-0.013% O
At present, it appears that the transfer of nitrogen across the gas/metal interface is controlled by the transport in the metal. Some models of gas absorption in liquid, such as the film theory, the penetration theory and the surface renewal theory, were taken into account to explain the present results.
The effects of several alloying elements on the absorption rates were also measured. It is to be noted that carbon, chromium and manganese have practically little influence, silicon, however, has somewhat remarkable influence in the lower concentrations. Namely, mass transfer coefficient increases gradually as silicon increases and reaches the limiting value of 5×10^-2 cm·sec^-1 at about 2% Si. It seems reasonable to consider that silicon reduces oxygen poison effect which is caused by absorption of dissolved oxygen on the metal surface, even in low oxygen level (0.002% O).
Transfer of nitrogen from gas into liquid iron may also be chemically controlled when the liquid iron contains some surface active agents. The role of surface active agents such as oxygen and sulphur will be discussed in the next paper.

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On the Rate of Absorption of Nitrogen in Liquid Iron and Iron Alloys, Containing Carbon, Silicon, Manganese and Chromium

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Several Phenomena Taking Place in Remaining Molten Steel in Large Killed Steel Ingots during Solidification Process

Yoshitaka NAKAGAWA, Akitsugu MOMOSE

pp. 1406-1424

Abstract

Several phenomena which take place in remaining molten steel in large killed steel ingots during solidification process have a great influence on those internal guality. Thus, it is essential in making sound steel ingots, to bring light on this problem.
In this report, floatation of segregated molten steel and settling phenomenon of crystals was studied to which especial importance have been attached among those phenomena.
The obtained results are as follows:
i) During the solidification process of steel ingots, the comparatively fast movement of solutes in remaining molten steel is behaved, and the concentration gradient toward the top is formed in it.
Such a phenomenon cannot be explained unless it is supposed that the segregated molten steel moves with some mass.
As a mechanism of floatation, various things are thought. According to the result of authors' model experiment; it was shown that the floatation of segregated molten steel is acted even in static steel bath at velocity or the order of 10^-2-10^-1cm/sec which is able to explain various phenomena taking place in practical steel ingots.
ii) It is assumed that the inertia flowing of molten steel taking place in pouring process has a great influence on the movement of solutes in remaining molten steel at the beginning of solidification process.
iii) The theory that natural convection (thermal convection and solute convection) will take place in remaining molten steel during solidification process has been strongly supported. But it is still unknown how far it will mainly act.
iv) So far the theory (gravity theory and convection one) that crystal particles are formed in remaining molten steel during solidification process, and that they settle down to form the negative segregation zone (settling crystal zone) is strongly supported. However according to the results of authors' experiments, such a conclusion was obtained that this theory has many problems, and it is rather unreasonable to explain various phenomena taking place during solidification process.

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Some Phenomena during the Solidication of Steel Ingots

Tetsu-to-Hagané Vol.56(1970), No.14

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Several Phenomena Taking Place in Remaining Molten Steel in Large Killed Steel Ingots during Solidification Process

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Theory of Solidification and Segregation

Kichizo NIWA

pp. 1425-1441

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Theory of Solidification and Segregation

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Dislocation Theory of Strength of Iron and Steel

Hideji SUZUKI

pp. 1442-1458

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Dislocation Theory of Strength of Iron and Steel

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抄録

pp. 1459-1463

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Tetsu-to-Hagané Vol. 53 (1967), No. 12

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blast furnace

古代製鉄

鉄

smelting furnaces

jang-sik park

korea

three kingdoms period

archaeology

deformation of inclusion during rolling

dp steel hydrogen embrittlement

Tetsu-to-Hagané Vol. 53 (1967), No. 12

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Thermodynamics of Liquid Iron Solutions

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On the Rate of Absorption of Nitrogen in Liquid Iron and Iron Alloys, Containing Carbon, Silicon, Manganese and Chromium

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Several Phenomena Taking Place in Remaining Molten Steel in Large Killed Steel Ingots during Solidification Process

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Theory of Solidification and Segregation

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Dislocation Theory of Strength of Iron and Steel

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抄録

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Article Access Ranking

Deformation-induced martensitic transformation at tensile and compressive deformations of bainitic steels with different carbon contents

Alloying effects on the microstructure of Fe-1mass%M binary alloys treated by austenitic nitriding and quenching treatment

Hydrogen effects on fracture resistances of bulk cementite evaluated by in-situ microbending test during cathodic hydrogen charging

Effect of slag phase on dephosphorization in BOF

Iron Ore Granulation for Sinter Production: Developments, Progress, and Challenges

Numerical simulation of bubble breakup and coalescence behavior in gas-stirred ladle

Examples of Fractured Steel Parts during Actual Usage due to Hydrogen Embrittlement and Consideration Regarding the Behavior of Hydrogen at the Prior Austenite Grain Boundary

Production and Technology of Iron and Steel in Japan during 1988

Surface and Grain Boundary Segregation on and in Iron and Steels

Effect of Oxygen Potential on Mineral Formation in Lime-fluxed Iron Ore Sinter

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