Abstract
The experiments on the absorption of nitrogen by molten Fe-C (0 to 3.5 Wt.%C) and Fe-Si alloys (0 to 31 Wt.%Si) were carried out according to the experimental procedures formerly reported, i.e. ,the saturation values,absorption rates etc.were measured.
On Fe-C alloys,the satuation value of N2 decreased with the increase of C%,as shown in Fig. 2.
In the case of Fe-Si alloys,the relation between saturatin values and Si% is somewhat abnormal as shown in Fig. 4: That is,with the increase of Si% the saturation value increased at first,and then decreased; The value reached a maximum at about 0.5 Wt.%Si ; From 14%Si (which correspond to Fe3Si composition) above,the value again increased.
From the consideration of these results, the following suggestion was acquired that the structure of molten state (quasi-crystalline) of these alloy differs from that of Fe-Ni,Fe-Cr or Fe-Mn alloys formerly reported. In Fe-C and Fe-Si alloys, the arrangement of atoms is not at random and some regularity seems to exist even in molten state.
The effect of alloying elements on the rate of absorption of N2 was also discussed. The rate decreased by the addition of Ni to Fe, and increasd by that of C,Si,Mn and Cr.The absorption rate coefficients (K) are tabulated in Table 1, assuming that the absorption of N2 is the reaction of the first order.
