Abstract
A series of FeCrMnNi alloys was melted under high nitrogen gas pressure. The nitrogen concentration in the solidified metal was found to be experimentally related to the melt pressures that ranged from 0.1 to 200 MPa, to the alloy composition, and to alloy concentration. The nitrogen solubility followed Sievert's law. The activity coefficients determined at these higher pressures for the alloying elements Cr, Mn and Ni were similar to those previously obtained at lower pressures. At the higher nitrogen melt-pressures, the nitrogen concentration exceeded the interstitial nitrogen solubility resulting in the formation of metal-nitrides.
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