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:logfCN=0.13 [%C] 3%ClogfAlN=0.010 [%Al] 3.8%Al, PN2=0.15-1.0atm logfSiN=0.060 [%Si] 3%Si logfPN=0.046 [%P] 5%PlogfMnN=-0.020 [%Mn] 9%Mn logfNiN=0.011 [%Ni] 10%Ni.