日本金属学会誌

J. Japan Inst. Metals, Vol. 32, No. 10 (1968),
pp. 949-954

Correlation between Interaction Parameters of Nitrogen Dissolved in Liquid Iron and in Austenite

Toshisada Mori1 and Eiji Ichise1

1Department of Metallurgy, Faculty of Engineering, Kyoto University, Kyoto

Abstract:

A definite correlation has been found between the interaction parameters of nitrogen dissolved in liquid iron and in austenite. This correlation is represented by the following equations: \begin{flalign*} && eN(1200)(X) &= 1.9eN(1600)(X) - 0.005,
and && εN(1200)(X) &= 1.9 εN(1600)(X) - 1.6
&& eN(1000)(X) &= 3.1eX(1600)N - 0.016 \end{flalign*}

\setlength{\labelwidth}{52mm} \setlength{ftmargin}{52mm} \setlength{\labelsep}{0mm} }
\hspace{20pt}where \hfill eN(1600)(X), εN(1600)(X) : interaction parameters of nitrogen at 1600°C,
\hfill eN(1200)(X), εN(1200)(X) : interaction parameters of nitrogen at 1200°C,
\hspace{20pt}and \hfill eN(1000)(X) : interaction parameters of nitrogen at 1000°C.

In these equations, the values of eN(1600)(X) were taken from the table of Elliott et al., and that of εN(1600)(X) were calculated from those values. Similar equations were derived by using the recommended values of Schürmann et al.,
eN(1200)(X) &= 1.8eN(1600)(X) - 0.004,
εN(1200)(X) &= 1.9 εN(1600)(X) - 1.2,
eN(1000)(X) &= 2.9eN(1600)(X) - 0.017.

By making use of these equations, the unknown values of the interaction parameter of nitrogen in austenite at 1200°C were evaluated.
Temperature dependence of the slope of the regression line between interaction parameters of nitrogen in liquid iron and in austenite was discussed.
The authors suggested that the analogous correlation may be applied for the interaction parameter of carbon.
The values of interaction parameter of nitrogen dissolved in austenite and its temperature dependence derived by the authors from the results of previous investigations were summarized in the appendix.


(Received 1968/3/8)

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