Abstract
In succession with the former determination of the solubilities of H2 and N2 in pure iron, the absorption of H2 with 10 kinds of elements and with 8 kinds of binary ferreous alloys has been determined in the present investigation by means of the same apparatus and procedure as described in the previous paper, and the results have been compared with their equilibrium diagrams. The results of the investigation are as follows. Mn, Ni, Cr, Si and Cu absorb H2 at high temperatures, the quantity increasing with rise of temperature; the solubility of H2 in Mn changes abruptly at the transformation point α Mn _??_ βMn, Ti and V absorb a large quantity of H2 at lower temperatures forming their hydrides, but the absorption of H2 by W and Mo has been undetectable by the present experimental conditions. The solubilities of H2 in the range of solid solution of alloys, Fe-Ni, Fe-Cr, Fe-Mn and Fe-Al determined with the continuous change of composition indicate neither an abrupt change nor a straight line but continuous curves with a maximum or a minimum. In the range of composition of a mixture of two phases the solubilities, determined with alloys of Fe-Cu system, change from one side to the other indicating a linear relation with the composition. The solubility of H2 in alloys of Fe-Si system is large at lower temperatures, especially in the case of cooling procedure, and the tendency of their temperature-solubility curves is similar to those of the hydride forming elements such as Ti and V.
