Abstract
The effects of arsenic and copper on the solubility of nitrogen in austenite were measured by the use of quenching method. The measurements were performed within the austenitic range; the experimental temperatures were 1250°, 1150° and 1050°C and the concentrations of arsenic and copper were up to 1.5% and 2.5%, respectively. The interaction parameters were determined as follows;
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The relationship between the interaction parameters and the atomic number of alloying elements and the temperature dependence of interaction parameters were also discussed. The curve showing relationship between the interaction parameters and the atomic number of the elements belonging to the 1st long period rises monotonously from V to Fe, having a plateau at the position of Co or Ni, and then drops at the position of Cu. And it rises again to the value at the position of As which may be expected from the monotonous increase. The behavior of the curve from Cu to As remains unknown because of the lack of data available on Zn, Ga and Ge.
Temperature dependence of the nitrogen solubility in γ-iron can be expressed as follows:
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This is the regression line of log[%N] with respect to 1⁄T determined from 124 data in a series of the authers’ experiments under one atmosphere of nitrogen.
