Solubility of Nitrogen in Liquid Iron Alloys

Abstract

Solubilities of nitrogen in liquid Fe-C, Fe-Al, Fe-Si, Fe-P, Fe-Mn and Fe-Ni alloys are measured in the temperature range of 1540° to 1680°C by sampling method.
The solubility of nitrogen in liquid iron decreases by addition of C, Al, Si, P and Ni, while it increases by addition of Mn. The effects of alloying elements on the activity of nitrogen in liquid iron at 1580°C are summarized as follows:
logf^C_N=0.13 [%C] 3%C
logf^Al_N=0.010 [%Al] 3.8%Al, P_N2=0.15-1.0atm logf^Si_N=0.060 [%Si] 3%Si logf^P_N=0.046 [%P] 5%P
logf^Mn_N=-0.020 [%Mn] 9%Mn logf^Ni_N=0.011 [%Ni] 10%Ni.