Nitrogen Solubility and Nitride Formation in Fe-cr-mn-ni-alloys.
Rawers-J; Bennett-J; Doan-R; Siple-J
Acta Metall Et Mater 40(6):1195-1199
In this U.S. Bureau of Mines study a series of fe-cr-mn-ni 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, which 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.
Acta Metall. Et Mater., V. 40, No. 6, PP. 1195-1199