日本金属学会誌

J. Japan Inst. Metals, Vol. 32, No. 6 (1968),
pp. 493-497

On the Composition of the Inclusions Composed of a Layer-Like Inclusions Group During the Deoxidation of Liquid Iron with Aluminum

Yoshimoto Wanibe1 and Kôkich Sano2

1Graduate Student, Nagoya University, Nagoya
2Department of Metallurgy, Faculty of Engineering, Nagoya University, Nagoya

Abstract:

The present work was carried out to drop an aluminum bar onto static liquid iron containing oxygen, and the inclusions forming a layer-like inclusions group were analyzed by the microanalyzer to confirm the results reported in the previous reports. Then, in order to discuss about the microanalysis, the results were compared with the analysis of the standard specimen in which pure alumina powder was buried into pure iron by pressing and sintering. The results are summarized as follows:
(1) It is inferred from the microanalytical results of the standard specimen that the inclusions with less than about 5.5 μ in diameter have the effect of the matrix at the electron beam diameter of about 1.5 μ. Whether the inclusions are Al2O3 or not can be determined by reckoning backward the alumina content in the inclusions from the relative intensity of iron, but the calculation from the intensity of aluminum is difficult because of its remarkable scattering.
(2) The inclusions in the inclusions group were analyzed by the microanalyzer to be almost Al2O3; especially at the lower aluminum content in the matrix, all were Al2O3. So the result in the previous reports is now confirmed.
(3) The microanalytical results of the matrix were discussed by using Philibert's and Barks' equations for the adsorption correction. The correctedvalue is not in good agreement with the alminum content reckoned backward from the relative intensity of iron, and this problem has to be discussed further.
(4) The microanalysis of the inclusions was discussed by the Barks' equation. The corrected alumina content is in relatively good agreement with that reckoned backward indirectly from iron oxide content, probably because of a very low solubility of FeO in Al2O3. The scattering alumina content, calculated from the intensity of aluminum, however, made the comparision impossible. What causes this scattering remains unknown.


(Received 1967/10/16)

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