Abstract
The nitrogen absorption of iron was investigated by holding pure iron in contact with N2 gas and quickly cooling it from several temperatures above 1, 400°C. The amount of nitrogen in the metal was then determined by chemical analysis. The results obtained were summarized as follows:
(1) The solubility of nitrogen abruptly decreases at the transfomation γ→δ.
(2) The temperature coefficient of solubility in the δ-iron is much larger than the value informed by Sieverts.
(3) The solubility of nitrogen in the liquid iron is the largest at the melting point of iron, that is, the temperature coefficient of solubility in the liquid iron is negative.
